VOL 3 Telecom, Datacom and Industrial Power Products High Performance Analog ICs 02 Contents Contents Page Description Simplified DC/DC Conversion Block Diagrams 01 Isolated Block Diagram 02 Nonisolated Block Diagram Hot Swap™/Ideal Diode Controllers 03 Overvoltage Protection Regulator and Inrush Current Limiter 04 – 05 Hot Swap Controllers 06–08 Ideal Diode Controllers 07 48V Fuse Monitor Isolated DC/DC Conversion 09 – 10 Flyback Controllers 10 – 11 Forward Controllers/Smart Drivers 12 Demonstration Boards – Telecom/Datacom (18V to 75V) 13 Industrial Power Conversion (9V to 36V) 14 – 15 Push-Pull, Half- and Full-Bridge Controllers Nonisolated DC/DC Conversion, Up to 100V Input 16 Buck and Boost High Voltage Controllers 17 Forward Controllers 18 Buck-Boost µModule® Regulators and Controllers 19 Monolithic Buck Regulators/Linear Regulators 20 MOSFET Drivers/Opto Drivers/Reference Voltage PoE, Interface, System Monitoring and Control 21 Power over Ethernet Controllers 22 – 23 24 I2C and SMBus Buffers and Accelerators 25 Voltage Monitors and Supervisors 25 Pushbutton Controllers 26 Coulomb Counter/Battery Gas Gauge 27 High Voltage I2C Current and Voltage Monitor 28 Supply Trackers, Sequencers and Margining Controllers Rugged Serial Interface Transceivers Visit www.linear.com for our complete product offering. I s o l at e d d c / d c c o n v e r s i o n block diagram Isolated DC/DC Conversion Surge Suppression, Hot Swap Controllers – High Voltage ORing Diode Controllers – High Voltage page 3 – 4 page 6, 7 ORing Diode Controllers – Low Voltage Hot Swap Controllers – Low Voltage page 8 page 5 VIN (4V - 100V) 0.6V to 52V Load Fuse Monitor page 7 Optional IBA for Point-of-Load (POL) (Eg, 28V, 12V, 5V or 3.3V) Flyback Controllers page 9 – 10 Secondary-Side Forward Controllers Forward Controllers/ Smart Drivers page 10 – 11 page 10 – 11 Secondary-Side Smart Drivers Push-Pull, Half- and Full-Bridge Controllers page 11 page 14 – 15 – LDO Regulators 1 Monolithic Synchronous Buck Regulators 1 Optocoupler Driver Reference Voltage page 20 Load Load Load µModule ® Regulators 1 Load High Current Step – Down Controllers 1 Load Multiple Output Regulators1 Load PolyPhase® Step – Down Controllers 1 Load MOSFET Drivers page 20 Power over Ethernet Controllers page 21 RS485/RS422 and RS232 Transceivers page 22, 23 1 For descriptions of these products, visit www.linear.com. Bus Buffers and Accelerators System Monitor and Control, Digital Power page 24 page 25 – 28 01 02 n o n I s o l at e d Dc / Dc C o n v e r s i o n block diagram Nonisolated DC/DC Conversion Surge Suppression, Hot Swap Controllers – High Voltage ORing Diode Controllers – High Voltage page 3, 4 page 6, 7 VIN (4V - 100V) ORing Diode Controllers – Low Voltage Hot Swap Controllers – Low Voltage page 8 page 5 0.6V to 52V Load Fuse Monitor page 7 Buck Controllers Optional IBA for Point-of-Load (POL) (Eg, 28V, 12V, 5V or 3.3V) LDO Regulators1 Load Load page 16 page 17 Monolithic Synchronous Buck Regulators1 Buck-Boost µModule Regulators and Controllers page 18 µModule Regulators1 Load High Current Step – Down Controllers1 Load Multiple Output Regulators1 Load PolyPhase Step – Down Controllers1 Load Forward Controllers Load Monolithic Buck Regulators page 19 High Voltage LDOs page 19 RS485/RS422 and RS232 Transceivers page 22, 23 1 For descriptions of these products, visit www.linear.com. Bus Buffers and Accelerators System Monitor and Control page 24 page 25 – 28 O v e r v o lta g e p r o t e c t i o n r e g u l at o r a n d4 i8nVrIu c uer eo nn t vlei r msi ti o en r ss oh l at drC LT4356 Surge Stopper: Overvoltage Protection Regulator and Inrush Current Limiter In industrial applications, high voltage power supply spikes with durations ranging from a few microseconds to hundreds of milliseconds are commonly encountered. The electronics in these systems must not only survive transient voltage spikes, but in many cases also operate reliably throughout the event. The LT®4356 Surge Stopper reduces the need for bulky filtering components (capacitors, inductors, TVS diodes, fuses) by isolating low voltage circuitry from damaging spikes and surges found in industrial systems. The LT4356 offers complete front end protection, guards against overloads and short circuits, and withstands input voltage reversal with a simple IC/MOSFET solution. The LT4356 also protects against DC overvoltage and overcurrent, which ordinary surge suppressors cannot do. Under normal conditions, the LT4356 drives the MOSFET fully on, so that input power passes through directly to the load, with very little loss. If the input voltage rises above an adjustable output threshold, the LT4356 regulates the output at a safe level. The regulating action eliminates the need to use high voltage rated components downstream. Instead, less costly components may be used, because the LT4356 blocks high voltages from reaching them. The LT4356 provides the ability to ride out transients for continued system operation. If the fault persists, an adjustable timer sets a time limit to ensure the MOSFET stays within its operating limits before the load is disconnected and the system is shut down. The timer capacitor is charged with a current proportional to the voltage drop, Vds. For an overcurrent fault, the timer charging current is increased. This unique feature takes more advantage of the Safe Operating Area (SOA) of the MOSFET than would a fixed timer interval, allowing the user to size the MOSFET appropriately for their surge requirements. LT4356 Features: • Stops High Voltage Surges • Adjustable Output Clamp Voltage • Overcurrent Protection • Wide Operation Range: 4V to 80V • Reverse Input Protection to –60V • Low 7μA Shutdown Current, LT4356-1/LT4356-3 • Adjustable Fault Timer • Inrush Current Limiting • Controls N-Channel MOSFET • Shutdown Pin Withstands –60V to 100V • Fault Output Indication • Spare Amplifier for Level Detection Comparator or Linear Regulator Controller • Guaranteed Operation to 125ºC • Latchoff Operation (LT4356-3) • Automatic Retry (LT4356-1, LT4356-2) • Available in (4mm × 3mm) 12-Pin DFN, 10-Pin MSOP or 16-Pin SO Packages 4A, 12V Overvoltage Output Regulator 10mΩ VIN 12V VOUT IRLR2908 10Ω 383k SNS VCC GATE 102k OUT FB SHDN 4.99k LT4356DE IN+ VCC DC/DC CONVERTER 100k EN UNDERVOLTAGE AOUT GND TMR SHDN GND FAULT FLT 0.1µF Overvoltage Protection Regulates Output at 27V During Transient 80V INPUT SURGE VIN 20V/DIV 12V 27V CLAMP VOUT 20V/DIV 12V 100ms/DIV 03 03 HOT S W AP C ONTROLLERS – HIGH VOLTAGE Hot Swap Controllers – High Voltage Hot Swap controllers allow a circuit board to be safely inserted and removed from a live backplane. Using an N-channel pass MOSFET, the board supply voltage can be ramped at an adjustable rate. Product features include independent adjustable inrush current and overcurrent limits to minimize stresses on the pass MOSFET during start-up, input step, and output step short-circuit conditions. Newer generation devices include an onboard ADC for board voltage and current monitoring, and an I2C interface for microcontroller interaction. LTC®4260: Positive High Voltage Hot Swap Controller with I2C Compatible Monitoring 3A, 48V Card Resident Application 0.010Ω Features: 48V • Allows Safe Insertion into Live Backplane • 8-Bit ADC Monitors Current and Voltage • I C/SMBus Interface • Wide Operating Voltage Range: 8.5V to 80V • High Side Drive for External N-Channel MOSFET • Input Overvoltage/Undervoltage Protection • Optional Latchoff or Autoretry After Faults • Alerts Host After Faults • Foldback Current Limiting 49.9k Input Voltage Range 10Ω 0.1μF * SDA SCL ALERT 2.67k VOUT 48V, 3A CL UV VDD OV SDAO SDAI SCL ALERT ON INTVCC 43.5k 100k 3.57k 6.8nF 1.74k CONNECTOR 1 2 Part Number FDB3632 + CONNECTOR 2 04 02 SENSE GATE SOURCE FB LTC4260 BD_PRST ADIN TIMER GND 24k GPIO 68nF GND BACKPLANE PLUG-IN CARD *DIODES INC. SMBT70A Inrush Control Overcurrent Control UV OV Fault Output PWRGD/ Reset Description Package High Voltage Hot Swap Controllers LT4250 –18V to –80V Ramp ACL1 Yes Yes Yes LT1640A Pin-Compatible with Active Current Limiting SO-8 LTC4252A-1/2 –15V to –100V (Floating) Active or Ramp ACL1 Yes Yes Yes Soft-Start Limits Inrush dI/dt Drain Accelerated Response. ±1% Undervoltage/Overvoltage Threshold Accuracy for AdvancedTCA Applications MSOP-8 MSOP-10 LT4256-1/2/3 10.8V to 80V Active or Ramp ACL1 Yes Yes Yes LT4256-1/2 Pin-Compatible Upgrade to LT1641. Open Circuit Detect Output. Latchoff/ Auto-Retry Operation SO-8 SSOP-16 LTC4260 8.5V to 80V Active or Ramp ACL1 Yes Yes Yes Yes Onboard 8-Bit ADC for Card Voltage and Current Monitoring, I2C Interface. Programmable Latchoff or Auto-Retry 5x5 QFN-32 SSOP-24 SO-24 LTC4261 –12V to –100V (Floating) Ramp ACL1 Yes Yes Yes Delayed Onboard 10-Bit ADC for Card Voltage and Current Monitoring, I2C Interface. Programmable Latchoff or Auto-Retry 4x5 QFN-24 SSOP-28 LT4356-1/2/3 4V to 80V Active or Ramp ACL1 Yes Yes Surge Stopper: Overvoltage Protection and Inrush Limiting. Spare Amplifier for UV/OV Monitoring or Linear Regulator. Latchoff/Auto-Retry Operation 4x3 DFN-12 MSOP-10 SO-16 ACL = Active Current Limit 1 HOT S W AP C ONTROLLERS – L o w VOLTAGE Hot Swap Controllers – Low Voltage Low voltage Hot Swap controllers include independent high side gate drivers to control single or dual voltages, as well as voltage power-up and power-down ramp control, current foldback and inrush limiting. Our latest LTC4217 and LTC4218 Hot Swap products allow the current limit threshold to be adjusted dynamically using an external pin. Additional features include a current monitor output that amplifies the sense resistor voltage for ground referenced current sensing and a MOSFET temperature monitor output. Dedicated 12V versions contain preset 12V-specific thresholds. LTC4215: Hot Swap Controller with I2C Compatible Monitoring 12V Application with 5A Circuit Breaker 0.005Ω Features: Allows Safe Insertion into Live Backplane 8-Bit ADC Monitors Current and Voltage • I2C/SMBus Interface • Wide Operating Voltage Range: 2.9V to 15V • dI/dt Controlled Soft-Start • High Side Drive for External N-Channel MOSFET • No External Gate Capacitor Required • Input Overvoltage/Undervoltage Protection • Optional Latchoff or Auto-Retry After Faults • Alerts Host After Faults • Inrush Current Limit with Foldback • Available in 24-Lead (4mm × 5mm) QFN and 16-Lead Narrow SSOP Packages Part Number Channels Input Voltage Range 34.8k 0.1µF CONNECTOR 1 • FDC653N + CONNECTOR 2 • 12V VOUT 12V CL 30.1k 10Ω 3.57k 1.18k P6KE16A 3.4k SDA SCL ALERT INTVCC UV VDD SENSE+ OV SDAO SDAI SCL ALERT INTVCC SENSE– GATE SOURCE FB EN LTC4215UFD INTVCC ADIN ON TIMER SS 0.1µF GND GPIO 68nF GND BACKPLANE PLUG-IN CARD Inrush Control Overcurrent Control Fault Output PWRGD/ Reset Description Package Active Current Limiting with a Circuit Breaker. Latchoff/Auto-Retry Operation SOT-23 Low Voltage Hot Swap Controllers LTC4210-1/2/3/4 1 2.7V to 16.5V Active or Ramp ACL1 Yes LTC4211 1 2.5V to 16.5V Active or Ramp ECB2 Yes Delayed No Gate Capacitor Required SO-8 MSOP-8 MSOP-10 LTC4215-1/2/3 1 2.9V to 16.5V Active or Ramp ACL1 Yes Yes I2C/SMBus Interface, Internal 8-bit ADC, dI/dt Controlled Soft-Start SSOP-16 4x5 QFN-24 LTC4216 1 0V to 6V Active or Ramp ACL1 Delayed Ultralow Voltage Hot Swap Controller for 0V to 6V, with a Separate Supply of 2.3V to 6V. Adjustable Current Limit, Soft-Start and Response Time for Overcurrent Protection MSOP-10 4x3 DFN-12 LTC4217/-12 1 2.9V to 26.5V Active or Ramp ACL1 Yes Yes Small Footprint 2A Hot Swap Controller. Integrated 33mΩ MOSFET and RSENSE. Adjustable, 5% Accurate Current Limit. 2% Accurate Undervoltage and Overvoltage Protection. A Dedicated 12V Version (LTC4217-12) Contains Preset 12V Specific Thresholds TSSOP-10 5x3 DFN-16 LTC4218/-12 1 2.9V to 26.5V Active or Ramp ACL1 Yes Yes Adjustable, 5% Accurate (15mV) Current Limit. 2% Accurate Undervoltage and Overvoltage Protection. A Dedicated 12V Version (LTC4218-12) Contains Preset 12V Specific Thresholds SSOP-16 5x3 DFN-16 LTC4222 2 2.9V to 29V Active or Ramp ACL1 Yes I2C/SMBus Interface, Internal 10-bit ADC, dI/dt Controlled Soft-Start. Latchoff/Auto-Retry Operation 5x5 QFN-32 SSOP-36 LTC4223-1/2 2 10V to 14V 2.7V to 6V Active or Ramp ACL1 Yes Controls 12V and 3.3V Auxiliary Supplies. Integrated 0.3Ω AUX Switch. Adjustable Current Limit with Circuit Breaker. Latchoff/Auto-Retry Operation 5x5 QFN-32 SSOP-36 ACL = Active Current Limit ECB = Electronic Circuit Breaker 1 2 Yes 24k 05 03 IDEAL DIODE C ONTROLLERS – HIGH VOLTAGE ORing Ideal Diode Controllers Linear’s family of ideal diode controllers reduces forward voltage drop and power dissipation in ORing applications, eliminating the heat sinks required by conventional rectifiers. They deliver smooth switchover without chatter and are free from oscillation in load sharing applications, yet respond quickly when called upon to block DC current in the reverse state. Our controllers prevent backfeeding between supplies and are easily configured to protect against reverse polarity inputs. Ideal Diode Controllers – High Voltage LTC4354: Negative Voltage Diode-OR Controller and Monitor Power Dissipation vs Load Current 6 The LTC4354 is a negative voltage and the LTC4355 is a positive voltage diode-OR controller that drive two external N-channel MOSFETs. Each replaces two Schottky diodes and the associated heat sink, saving power and space. The power dissipation is greatly reduced by using N-channel MOSFETs as the pass transistors. Power sources can be easily ORed together to increase total system power and reliability. 5 POWER DISSIPATION (W) 06 02 LTC4355: Positive High Voltage Dual Ideal Diode-OR with Input Supply and Fuse Monitors Replaces Power Schottky Diodes • Controls N-Channel MOSFETs RTNA • 0.5µs Turn-Off Time Limits Peak Fault Current RTNB • Wide Operating Voltage Range: 9V to 80V • Smooth Switchover without Oscillation No Reverse DC Current • Monitors VIN, Fuse and MOSFET Diode • Available in 14-Lead (4mm × 3mm) DFN, 16-Lead MS and SO Packages POWER SAVED 2 FET (FDB3632) 0 0 2 4 6 CURRENT (A) Positive and Negative Supply Diode-ORing • • 3 1 The LTC4355 can diode-OR two positive supplies or the return paths of two negative supplies, such as in a –48V system. Power fault detection indicates if the input supplies are not in regulation, the inline fuses are blown, or the voltages across the MOSFETs are greater than the fault threshold. Features: DIODE (MBR10100) 4 IN1 GATE1 IN2 GATE2 OUT LTC4355 LTC4355 GND LOAD VCC LTC4354 LTC4354 DA VA=-48V VB=-48V DB GA GB VSS 8 10 I d e a l D i o d e c o n t r o l l e r s / F USE MONITOR LTC4357: Positive High Voltage Ideal Diode Controller 48V, 10A Diode-OR The LTC4357 easily ORs power sources to increase total system reliability. In diode-OR applications, the LTC4357 controls the forward voltage drop across the MOSFET to ensure smooth current transfer from one path to the other without oscillation. If the power source fails or is shorted, a fast turn-off minimizes reverse current transients. FDB3632 VINA 48V GATE OUT LTC4357 VDD IN GND Features: • VOUT TO LOAD Reduces Power Dissipation by Replacing a Power Schottky Diode with an N-Channel MOSFET • 0.5µs Turn-Off Time Limits Peak Fault Current • Wide Operating Voltage Range: 9V to 80V • Smooth Switchover without Oscillation • No Reverse DC Current • Available in 6-Lead (2mm × 3mm) DFN and 8-Lead MSOP Packages Part Number FDB3632 VINB 48V GATE OUT LTC4357 VDD IN Input Supply Range GND Ideal Diode External FET Fault Monitoring Package High Voltage Ideal Diode Controllers LTC4354 –4.5V to –100V (Floating) Dual N-Channel Yes 3x2 DFN-8, SO-8 LTC4355 9V to 80V Dual N-Channel Yes 4x3 DFN-14, SO-16, MSOP-16 LTC4357 9V to 80V Single N-Channel No 2x3 DFN-6, MSOP-8 48V Fuse Monitor The LTC1921 monitors two independent –48V supplies, including their fuses and drives up to three optoisolators to indicate status. Requiring only three noncritical resistors and optoisolators, the LTC1921 replaces multiple voltage comparators, a voltage reference and several precision resistors. Dual Supply Fuse Monitor –48V RETURN 100k 100k FUSE GOOD –48V LOAD RTN VA OUT F VB LOGIC SUPPLY SUPPLY A GOOD SUPERVISOR µP SUPPLY B GOOD LOGIC COMMON LTC1921 LTC1921 FUSE A OUT A FUSE B OUT B SUPPLY A –48V F1 SUPPLY B –48V F2 Part Number Input Voltage Range UV OV Package –10V to –80V Yes Yes MSOP-8, SO-8 Fuse Monitor LTC1921 07 03 IDEAL DIODES AND C ONTROLLER s – L o w v o lta g e Ideal Diodes and Controllers – Low Voltage LTC4352: Low Voltage Ideal Diode Controller with Monitoring The LTC4352 is a 0V to 18V ideal diode controller that enables low loss ORing of multiple power sources with minimal disturbance to supply voltages. A fast turn-on reduces the load voltage drop during supply switchover. Power passage is disabled during undervoltage or overvoltage conditions. The controller also features an open MOSFET detect circuit that flags excessive voltage drop across the pass transistor in the on state. A REV pin enables reverse current, overriding the diode behavior when desired. 12V Ideal Diode with Status and Fault Indicators Q1 Si7336ADP TO LOAD 12V C2 R4 2.7k 0.1µF CPO SOURCE C1 0.1µF GATE VIN LTC4352 UV OV Features: FAULT REV • Low Loss Replacement for Power Diode • Controls N-Channel MOSFET • 0V to 18V Supply ORing or Holdup • 0.5μs Turn-On and Turn-Off Time • Undervoltage and Overvoltage Protection • Open MOSFET Detect • Status and Fault Outputs • Hot Swappable R5 2.7k D1 OUT STATUS VCC MOSFET ON D2 FAULT D1: GREEN LED LN1351C D2: RED LED LN1261CAL GND Power Dissipation vs Load Current 4.0 3.5 • Reverse Current Enable Input • 12-Pin MSOP and DFN (3mm × 3mm) Packages POWER DISSIPATION (W) 08 LTC4358: 5A Ideal Diode The LTC4358 is a 5A ideal diode that uses an internal 20mΩ N-channel MOSFET to replace a Schottky diode when used in diode-OR and high current diode applications. The LTC4358 reduces power consumption, heat dissipation, and PC board area. 3.0 DIODE (SBG1025L) 2.5 2.0 POWER SAVED 1.5 1.0 0.5 0 MOSFET (Si7336ADP) 0 2 4 6 LOAD CURRENT (A) 8 Features: • Replaces a Power Schottky Diode • Internal 20mΩ N-Channel MOSFET • 0.5μs Turn-Off Time Limits Peak Fault Current • Operating Voltage Range: 9V to 26.5V • Smooth Switchover without Oscillation • No Reverse DC Current • Available in 14-Pin (4mm × 3mm) DFN and 16-Lead TSSOP Packages 12V, 5A Diode-OR VINA = 12V Part Number Input Supply Range IN DRAIN OUT Ideal Diode External FET Package LTC4358 5A Ideal Diode VDD VOUT TO 5A LOAD GND LTC4352 0V to 18V Single, Fast Turn-On and Turn-Off N-Channel 3x4 DFN-12 MSOP-12 LTC4358 9V to 28V Single Internal 5A FET 4x3 DFN-14 TSSOP-16 LTC4412 2.5V to 28V Single P-Channel ThinSOT ™ LTC4412HV 2.5V to 36V Single P-Channel ThinSOT LTC4414 3V to 36V Single P-Channel MSOP-8 VINB = 12V IN DRAIN OUT LTC4358 GND VDD 10 F ly b a c k c o n t r o l l e r s Introduction to DC/DC Controllers High density power systems require very high efficiency, excellent power density and ease of implementation. Linear Technology offers a family of high performance DC/DC controllers specifically tailored for isolated power conversion for input voltages ranging from 4V to 100V for telecom, datacom and industrial applications. We feature primary- and secondary-side control ICs, which provide synchronous rectification, fast transient response, overvoltage and overcurrent protection and a host of other features. These devices enable output voltages from 0.6V to 52V from flyback, forward, half-bridge, push-pull or full-bridge topologies. Off-the-shelf planar magnetics can be used in many applications, reducing design complexity. Flyback Controllers – Low Power (Up to 60W) Synchronous and non-synchronous flyback controllers are offered for output power levels up to 60W. This family of current mode flyback controllers can either regulate the output voltage with integrated primary-side regulation circuitry or can be used with a secondary-side optocoupler driver and optoisolator. Synchronous rectification is easily controlled by the LT3825 or LT3837, which increases conversion efficiency and improves output cross regulation in multiple output power supplies. As an example, the LT3825 can convert an input supply of 36V-75V to an isolated output of 3.3V at 12A with up to 90% efficiency. LTC3803-3 Isolated Demo Board Part Number: DC1100A VIN: 18V to 75V Output: 3.3V at 3A Isolated Synchronous Rectified No-Opto Flyback Converter V IN 36V–75V V OUT 3.3V 12A + 28.7k T1 T1 47k 3.01k + 47µF 412k FB 2.2µF SG SG Vcc LT3825 UVLO 15k PGDLY SYNC PG SENSE+ SENSE– 0.02 Ω SG 330 0.1µF 2.2nF Vc OSC GND 12k 10nF 47pF 1µF 15Ω 100k 10k Low Power Isolated Flyback Converter VIN 18V–75V VOUT 3.3V 3A TI 2.2µF 300µF 100k VCC VCC 0.1µF FB NGATE ITH SENSE GRND LTC3803-3 4.7k VCC 6.8k VCC 11k OPTO LT4430 FB GRND 1.5k 09 03 f ly b a c k / F OR W ARD c o n t r o l l e r s Flyback Controllers/Monolithic – Low Power (Up to 60W) Maximum Output1 Power (W) Part Number VIN Range (V) VOUT3 Range (V) Operating Frequency Package Description Primary-Side Flyback Controllers/Monolithic LT3573 7 3 to 40 1.23 to 52 40kHz to 1MHz MSOP-16E 3x3 QFN-16 No-Opto Flyback with Integrated Power Switch LTC3803-5 25 4.8 to 753 0.8 to 52 200kHz ThinSOT Constant Frequency Current Mode Flyback Controller with 5.7V UVLO LTC3803/-3 25 8.7 to 753 0.8 to 52 200kHz or 300kHz ThinSOT Constant Frequency Current Mode Flyback Controller in ThinSOT LTC3805/-5 25 8.4/4.5 to 753 0.8 to 52 70kHz to 700kHz2 3x3 DFN-10 MSOP-10E Selectable Frequency Current Mode LT1737 25 4.5 to 753 1.23 to 52 50kHz to 250kHz2 SO-16, SSOP-16 No-Opto Flyback Controller LTC3873/-5 25 8.4/4.1 to 75 1.20 to 52 200kHz ThinSOT, DFN-8 Constant Frequency Current Mode Controller LT1725 50 16 to 753 1.20 to 52 50kHz to 250kHz2 SO-16, SSOP-16 Flyback with or without Optocoupler LTC1871 50 2.5 to 36 1.23 to 52 50kHz to 1MHz2 MSOP-10 Wide Input Range Current Mode Controller LT3825 60 3 16 to 75 1.23 to 52 50kHz to 250kHz TSSOP-16E Synchronous Flyback with or without Optocoupler LT3837 60 4.5 to 75 1.23 to 52 50kHz to 250kHz TSSOP-16E Synchronous Flyback with or without Optocoupler LT3757 60 2.9 to 40 1.60 to 52 2 100kHz to 1MHz MSOP-10E 3x3 DFN-10 Selectable Frequency Current Mode LT3758 60 5.5 to 100 1.60 to 52 100kHz to 1MHz2 MSOP-10E 3x3 DFN-10 High Input Voltage Selectable Frequency Current Mode 3 3 2 2 The maximum output power depends on the choice of external components. The operating frequency can be selected within the range indicated. 3 The input and output voltage range depends on external components. For higher voltages, consult factory. 1 2 Forward Controllers – Medium Power (Up to 300W) Linear Technology’s single switch and 2-switch forward controllers normally operate with primary and secondary-side ICs for control, timing and driving of synchronous MOSFETs. The single switch forward converter schematic below shows the LTC3706 as a secondaryside controller with primary-side LTC3725 smart driver. Efficiencies up to 95% are achieved with this circuit for output voltages ranging from 0.6 to 52V. Efficiency 48V to 3.3V/25A Isolated Forward Converter 95 T1 VIN 36V - 75V VIN = 36V EFFICIENCY (%) 10 90 0.85µH V OUT 3.3V 25A 1µF + 100µF VIN = 72V 220µF 1nF 0.039Ω 4.7µF 0.002Ω 85 2.2µF 100k VCC NDRV GATE IS FB/IN+ 1µF 0.1µF 2.74k PT+ I S– FG SW IS+ SG V IN NDRV VCC T2 80 365k 0 5 10 15 LOAD CURRENT (A) 20 UVLO 25 1µF 15k LTC3725 SSFLT GND 33nF LTC3726 5.1k PT– FS/IN– GND FB I TH RUN/SS SLP 162k 604 33nF 100k 6.2k 2.2nF Forward controllers Forward Controllers/Smart Drivers – Medium Power (Up to 300W) MOSFET Drive Current Part Number VIN3 Range (V) Operating Frequency2 Package Description Primary-Side Smart Drivers LTC3705 2A 9 to 75 70kHz to 700kHz SSOP-16 2-Switch Forward Smart Gate Driver, Works with Secondary-Side Synchronous Controller LTC3706 or LTC3726 LTC3725 2A 9 to 75 70kHz to 700kHz MSOP-10E Single-Switch Forward Smart Gate Driver, Works with Secondary-Side Synchronous Controller LTC3706 or LTC3726 Part Number Output1 Power Range (W) VCC Range (V) VOUT Range (V) Operating Frequency2 Package Description Secondary-Side Controllers LTC3706 Up to 300 5 to 30 0.60 to 52 100kHz to 500kHz SSOP-24 Synchronous Forward Controller with PolyPhase Capability, Can Be Used with Primary Driver LTC3705 or LTC3725 LTC3726 Up to 300 5 to 10 0.60 to 52 100kHz to 500kHz SSOP-16 Synchronous Forward Controller, Can Be Used with Primary Driver LTC3705 or LTC3725 Part Number Output1 Power Range (W) VIN3 Range (V) VOUT Range (V) Operating Frequency2 Package Description Primary-Side Controllers LT1952/-1 Up to 300 8/15.75 to 75 1.23 to 52 100kHz to 500kHz SSOP-16 Single-Switch Synchronous Forward Controller, Can Be Used with Secondary-Side LTC3900 LT3781 Up to 300 16 to 75 1.25 to 52 350kHz SSOP-20 2-Switch Synchronous Forward Controller. Works with LTC1698 MOSFET Driver Part Number MOSFET Drive Current VCC Range (V) Operating Frequency2 Package Description Secondary-Side Smart Drivers LTC3900 2A 4.5 to 11 100kHz to 500kHz SO-8 Synchronous Rectifier Driver for Forward Converters, Can Be Used with Primary Controller LT1952 or LTC3723 LTC3901 2A 4.5 to 11 100kHz to 500kHz SSOP-16 Synchronous Rectifier Driver for Push-Pull and Full-Bridge Converters, Can Be Used with Primary Controller LTC3722 or LTC3723 LTC1698 2A 6 to 12.6 350kHz SSOP-16, SO-16 Synchronous Rectifier Driver for Forward Converters, Can Be Used with Primary Controller LT1952, LTC3723 or LT3781 The maximum output power depends on the choice of external components. The operating frequency can be selected within the range indicated. 3 The input voltage range depends on external components. For higher voltages, consult factory. 1 2 Efficiency 48VIN to 3.3V at 30A Active Reset, Self-Driven Isolated Forward VU1 VIN 36V TO 75V 1.5mH 94 0.65µH T1 82k VOUT 3.3V 30A + 2.2µF 92 470µF VIN 0.1µF 2.2 133 2.2 10k 0.015 VFB 22k 33k 115k 158k 0.1µF LT1952-1 ROSC OUT SYNC PGND SS_MAXDC DELAY 4.7µF 174k 22k 13.3k VIN 0.47µF 0.22µF 340k OC VREF SD_VSEC ISENSE BLANK GND 47k 1.2k VFB VCC OPTO GND COMP OC 1.2k 2.2nF 1µF 82.5k 88 86 84 LT4430 VU1 SOUT VIN COMP FB 47pF 470 EFFICIENCY (%) 90 33nF 7.5k 10nF 72VIN 48VIN 36VIN 82 FB 18.2k 80 0 5 10 15 20 IOUT (A) 25 30 35 11 12 02 DEMONSTRATION BOARDS – TELE C OM / DATA C OM Demonstration Boards – Isolated Solutions for Telecom and Datacom Applications Linear Technology offers demonstration boards for a wide variety of applications, including isolated and nonisolated power supplies. In addition to the demonstration board, we supply the electrical schematic, bill of materials and Gerber files for the PCB design. We also include a Quick Start Guide that describes the circuit operation and provides performance curves, including load regulation, ripple and noise, efficiency and transient response. We can also develop customized solutions if the exact demo board for a specific requirement does not exist. Contact your local sales representative for further details. Below are photos of standard demo boards showing the industry-standard size 1/8 brick, measuring 0.9" x 2.3", and 1⁄4 brick, measuring 1.45" x 2.3" form factors. Both convert a 36V to 75V input to isolated output voltages ranging from 0.6V to 52V. Efficiencies up to 95% are realized using off-the-shelf planar power transformers and inductors. 1/4 Brick Size Demo Board Demonstration Board Number VIN Range (V) 1/8 Brick Size Demo Board Output Rating(s) Circuit Size (Inches) Description 48V Nominal Input Isolated Demonstration Boards DC1100A 18 to 75 3.3V/3A 1.63 x 0.56 LTC3803-3 Flyback DC1311A-A 18 to 75 3.3V/3A 1.50 x 0.63 LTC3805 Flyback DC1412A 18 to 72 3.3V/3A 1.50 x 0.63 LT3758 Flyback DC1154A 36 to 75 3.3V/3A 1.50 x 0.63 LTC3873 Flyback DC649A 36 to 75 5V/2A 1.10 x 1.25 LTC3803 Flyback DC894A-A 36 to 75 3.3V/12A 1.25 x 1.20 LT3825 Synchronous No-Opto Flyback DC894A-B 36 to 75 5V/8A 1.25 x 1.20 LT3825 Synchronous No-Opto Flyback DC894A-C 36 to 75 12V/5A 1.25 x 1.20 LT3825 Synchronous No-Opto Flyback DC950A-A 36 to 75 5V/2A, 3.3V/3A, 2.5V/3A 1/4 Brick (1.45 x 2.30) LT3825 Synchronous Flyback Triple Output DC1031A-A 36 to 75 2.5V/20A 1/8 Brick (0.90 x 2.30) LTC3725/LTC3726 Synchronous Forward DC1031A-B 36 to 75 3.3V/20A 1/8 Brick (0.90 x 2.30) LTC3725/LTC3726 Synchronous Forward DC968A-A 36 to 75 3.3V/30A 1/8 Brick (0.90 x 2.30) LT1952-1/LT4430 Synchronous Forward DC1317A-A 36 to 75 3.3V/30A 1/8 Brick (0.90 x 2.30) LT1952-1/LT4430 Synchronous Forward DC759A 36 to 75 5V/20A 1/8 Brick (0.90 x 2.30) LT1952-1/LT4430 Synchronous Forward DC1031A-C 36 to 75 5V/20A 1/8 Brick (0.90 x 2.30) LTC3725/LTC3726 Synchronous Forward DC1317A-B1 18 to 75 5V/25A 1/8 Brick (0.90 x 2.30) LT1952-1/LT4430 Synchronous Forward DC968A-C 36 to 75 12V/12A 1/8 Brick (0.90 x 2.30) LT1952/LT4430 Synchronous Forward DC1032A 36 to 75 12V/12A 1/8 Brick (0.90 x 2.30) LTC3725/LTC3726 Synchronous Forward 1 DC1317A-C 18 to 75 12V/10A 1/8 Brick (0.90 x 2.30) LT1952-1/LT4430 Synchronous Forward DC1317A-D1 18 to 75 24V/5A 1/8 Brick (0.90 x 2.30) LT1952-1/LT4430 Synchronous Forward DC968A-D 36 to 75 28V/4A 1/8 Brick (0.90 x 2.30) LTC3705/LTC3706 Synchronous Forward DC677A 36 to 75 3.3V/50A 1.70 x 2.90 LT1952/LT4430 Synchronous Forward DC830A 36 to 75 3.3V/40A 1/4 Brick (1.45 x 2.30) LT1952/LT4430 Synchronous Forward DC888A-A2 36 to 75 3.3V/50A 1/4 Brick (1.45 x 2.30) LTC3725/LTC3706 Synchronous Forward 2 DC888A-B 36 to 75 5V/40A 1/4 Brick (1.45 x 2.30) LTC3725/LTC3706 Synchronous Forward DC888A-C2 36 to 75 12V/20A 1/4 Brick (1.45 x 2.30) LTC3725/LTC3706 Synchronous Forward DC607A 36 to 75 12V/35A 4X3 LTC3722-1 Synchronous Full-Bridge 1 These designs utilize active transformer reset. 2 These boards are designed to be paralleled for higher current applications. 1 i s o l ATED D C / D C C ONVERSION Isolated Solutions for Industrial Applications Many industrial applications demand isolation and high efficiency at lower input voltages. Linear Technology offers multiple controllers specifically designed for isolated power conversion from 12V and 24V sources. Advantages of these solutions include reduced complexity, synchronous rectification and the ability to accommodate other output voltages and power levels with relatively minor changes to existing designs. Leveraging these flyback and forward solutions results in shorter design cycles and flexible designs. 5V Isolated Flyback Converter 5V Isolated Flyback Converter VIN 10V TO 30V 10μF LT3573 Isolated Demo Board Part Number: DC1228A VIN: 10V to 30V Output: 5V at 1A VOUT 5V at 0.7A, VIN<20V 5V at 1A, VIN≥20V 3:1 357k 0.22µF VIN 2k 24μH SHDN/UVLO 47µF 93.1k 80.6k LT3573 RFB RREF TC 6.04k RILIM SS SW VC 28.7k GND BIAS 20k 10k 10nF 1nF 4.7µF LTC3725/LTC3726 Isolated Demo Board Part Number: DC1174A-A VIN: 9V to 36V Output: 5V at 10A Demonstration Board Number VIN Range (V) Output Rating(s) Circuit Size (Inches) Description 24V Nominal Input Isolated Flyback and Forward Demonstration Boards DC1228A 10 to 30 5V/1A 0.59 x 1.22 LT3573 Monolithic No-Opto Flyback DC418A 8 to 36 5V/0.2A, ±15V/0.1A 1.50 x 1.50 LT1737 No-Opto Flyback Triple Output DC1038A-A 9 to 36 3.3V/10A 1.20 x 1.50 LT3837 Synchronous No-Opto Flyback DC1038A-B 9 to 36 5V/7A 1.20 x 1.50 LT3837 Synchronous No-Opto Flyback DC1038A-C 9 to 36 12V/3A 1.20 x 1.50 LT3837 Synchronous No-Opto Flyback DC950A-B 9 to 36 2.5V/3A, 3.3V/3A, 5V/2A 1/8 Brick (0.90 x 2.30) LT3837 Synchronous No-Opto Flyback Triple Output DC1317A-F 9 to 36 3.3V/20A 1/8 Brick (0.90 x 2.30) LT1952-1/LT4430 Synchronous Forward DC1174A-A 9 to 36 5V/10A 1/8 Brick (0.90 x 2.30) LTC3725/LTC3726 Synchronous Forward DC1174A-B 9 to 36 12V/4A 1/8 Brick (0.90 x 2.30) LTC3725/LTC3726 Synchronous Forward DC1317A-G 9 to 36 12V/5A 1/8 Brick (0.90 x 2.30) LT1952-1/LT4430 Synchronous Forward DC1174A-C 9 to 36 15V/3.3A 1/8 Brick (0.90 x 2.30) LTC3725/LTC3726 Synchronous Forward DC968A-B 18 to 36 5V/20A 1/8 Brick (0.90 x 2.30) LT1952/LTC3900 Synchronous Forward DC1317A-H 9 to 36 48V/1.5A 1/8 Brick (0.90 x 2.30) LT1952-1/LT4430 Synchronous Forward DC1300A-A 9 to 36 5V/20A 1/4 Brick (1.45 x 2.30) LTC3725/LTC3726 Synchronous Forward DC1300A-B 9 to 36 12V/8.4A 1/4 Brick (1.45 x 2.30) LTC3725/LTC3726 Synchronous Forward DC1300A-C 9 to 36 15V/6.7A 1/4 Brick (1.45 x 2.30) LTC3725/LTC3726 Synchronous Forward 13 03 14 02 push-pull, half- and full-bridge controllers Push-Pull, Half- and Full-Bridge Controllers – High Power (100W to 750W) The LTC3721 and LTC3723 controllers are well suited for power levels from 100W to 750W, providing simple solutions for high power applications. Synchronous and non-synchronous rectification modes of operation are supported. The push-pull, half- and full-bridge configurations offer smaller input filter and output inductors compared to single-ended converters. They also provide up to 40% greater transformer utilization and balanced semiconductor power dissipation over the input voltage range. Isolated Non-Synchronous Push-Pull Converter V IN V OUT DRVA UVLO + DRVB CS V CC LTC3721-1 LTC3721-1 V REF SS V OUT COMP GND OPTO LT4430 COMP GND V IN OC FB Isolated Synchronous Rectified Push-Pull Converter V OUT V IN + DRVA UVLO SYNC ME DRVB LT3901 CS V CC MF LTC3723-1 LTC3723-1 SDRA SDRB V REF SS V OUT OPTO LT4430 GND COMP V IN COMP GND OC Part Number Output1 Power Range (W) VIN3 Range (V) VOUT Range (V) FB Operating Frequency2 Package Description Primary-Side Push-Pull, Half-Bridge and Full-Bridge Controllers LTC3721-1 100 to 750 10.7 to 75 1.2 to 52 Up to 1MHz SSOP-16 4x4 QFN-16 Push-Pull and Full-Bridge Non-Synchronous Topologies LTC3723-1 100 to 750 10.7 to 75 1.2 to 52 Up to 1MHz SSOP-16 Push-Pull and Full-Bridge Current Mode Synchronous Topologies LTC3723-2 100 to 750 10.7 to 75 1.2 to 52 Up to 1MHz SSOP-16 Push-Pull, Half-Bridge and Full-Bridge Voltage Mode Synchronous Topologies The maximum output power depends on the choice of external components. The operating frequency can be selected within the range indicated. 3 The input voltage range depends on external components. For higher voltages, consult factory. 1 2 f u l l - b r i d g e p h a s e - m o d u l at e d c o n t r o l l e r s Full-Bridge Phase-Modulated Controllers – Higher Power (200W to 1KW) The phase-modulated full-bridge LTC3722 controller employs zero voltage switching (ZVS) with phase-shifted power supply control, intended for isolated offline and distributed power supplies of 200W to 1 kilowatt. This device operates at a selectable fixed frequency with current mode control and adaptive zero voltage delay control over all operating conditions, optimizing efficiency and reducing transformer size and EMI. This controller also provides simple programmability for current limit, leading edge blanking, soft-start and short-circuit protection. Typical Full-Bridge Circuit VIN 36V - 75V V CC OUTC OUTA LTC3722-1 VOUT OUTB OUTD CS OUTF GRD Part Number Output1 Power Range (W) VIN3 Range (V) LTC3901 OUTE VOUT Range (V) Operating Frequency2 Package Description Primary-Side Full-Bridge Controllers LTC3722-1 200 to 1K 10.5 to 75 5 to 24 300kHz to 1MHz SSOP-24 Full-Bridge Synchronous with ZVS, Current Mode Control LTC3722-2 200 to 1K 10.5 to 75 5 to 24 300kHz to 1MHz SSOP-24 Full-Bridge Synchronous with ZVS, Voltage Mode Control The maximum output power depends on the choice of external components. The operating frequency can be selected within the range indicated. 3 The input voltage range depends on external components. For higher voltages, consult factory. 1 2 LTC3722-1 Isolated Demo Board Part Number: DC607A VIN: 36V to 75V, Output: 12V at 35A 15 03 16 02 n o n i s o l at e d d c / d c c o n v e r s i o n Introduction Linear Technology offers controllers, monolithic switching regulators and linear regulators for high voltage (up to 100V) nonisolated step-down (buck) and step-up (boost) DC/DC power conversion. Topologies include synchronous and non-synchronous buck, boost, buck-boost, forward and flyback converters. Included are low quiescent current controllers and monolithic parts that help preserve battery life during standby mode. Buck and Boost Controllers – High Voltage Shown below are synchronous and non-synchronous buck and boost controllers that operate from input voltages up to 100 volts. Selection parameters include output voltage range, operating frequency, quiescent current and choice of sense resistor. High Efficiency, High Voltage Step-Down Converter RON 261k ION VRNG 1000pF 5pF 47pF Part Number VIN Range (V) VOUT Range (V) Max Output Current (A)1 Synchronous Operation VIN 15V TO 100V BOOST LTC3810 TG MODE/SYNC 0.1µF VOUT 12V/6A SW SS/TRACK EXTVCC SHDN INTVCC DRVCC 14k + SENSE+ ITH 200k CIN 22µF NDRV PGOOD LTC3810 Demo Board + 100k 270µF BG VFB SGND SENSE– BGRTN Operating Frequency2 1k 1µF No Sense Resistor Package Buck Controllers LT3724 4 to 60 1.23 to 36 5 200kHz TSSOP-16E LTC3824 4 to 60 0.8 to VIN 5 200kHz to 600kHz MSOP-10E LTC3703-5 4.1 to 60 0.8 to 0.93VIN 10 X 100kHz to 600kHz X SSOP-16, SSOP-28 LTC3703 9.3 to 100 0.8 to 0.93VIN 10 X 100kHz to 600kHz X SSOP-16, SSOP-28 LT3844 4 to 60 1.23 to 36 10 LT3800 4 to 60 1.23 to 36 20 LTC3812-5 4.2 to 60 0.8 to 0.93VIN LT3845 4 to 60 LTC3810 6.2 to 100 LTC3810-5 4.2 to 60 100kHz to 600kHz TSSOP-16E X 200kHz TSSOP-16E 20 X 100kHz to 1MHz Constant On-Time 1.23 to 36 20 X 100kHz to 600kHz 0.8 to 0.93VIN 20 X 100kHz to 1MHz Constant On-Time X SSOP-28 0.8 to 0.93VIN 20 X 100kHz to 1MHz Constant On-Time X 5x5 QFN-32 X MSOP-10 X TSSOP-16E TSSOP-16E Boost Controllers LTC1871/-1/-7 2.5 to 36 8 and Higher3 5 50kHz to 1MHz LT3757 2.9 to 40 3 8 and Higher 5 100kHz to 1MHz 3x3 DFN-10, MSOP-10E LT3758 5.5 to 100 8 and Higher3 5 100kHz to 1MHz 3x3 DFN-10, MSOP-10E LTC3814-5 4.5 to 0.9VOUT 8 to 60 10 X 100kHz to 1MHz X TSSOP-16 LTC3813 7 to 0.9VOUT 8 to 100 10 X 100kHz to 1MHz X SSOP-28 LT3782A 6 to 40 8 and Higher3 20 150kHz to 500kHz SSOP-28, 4x5 QFN-28 LTC3862/-1 4/8.5V to 36 8 and Higher3 40 75kHz to 500kHz TSSOP-24, SSOP-24, 5x5 QFN-24 The maximum output current depends on the choice of external components. The frequency can be selected within the range indicated. 3 The output voltage depends upon external components. 1 2 forward controllers Forward Controllers The forward converter is the preferred topology for very high step-down ratio nonisolated applications. This topology produces a higher efficiency converter when stepping down from 48V to voltages below 5V versus a conventional buck and allows the use of smaller input and output capacitors. 48V to 3.3V/35A Active Reset, Self-Driven Nonisolated Forward Converter VU1 VIN 36V TO 75V 1.5mH 0.65µH 82k VOUT 3.3V 35A 2.2Ω 4.7µF VIN 2.2Ω 22nF 200Ω 0.1µF 10k 20.5k 0.015Ω 12.1k 15nF 6.8k COMP FB 115k 470k 0.47µF 0.1µF VU1 SOUT VIN LT1952-1 ROSC OUT SYNC PGND SS_MAXDC DELAY 4.7µF 174k 22k OC VREF 6.81k SD_VSEC 178k GND ISENSE BLANK 1.2k 39k VIN Typical Nonisolated Synchronous Forward Converter V IN 36V - 75V V OUT 0.6V to 52V 100µF 1nF 2.2µF 220µF 0.012 2.2µF V IN R1 10k IS– IS+ FG SG SW V CC LTC3726 PT+ GND RUN/SS SLP 33nF 100k FB VC MODE 6.2k 100k R2 2.2nF NOTE: THE VALUES OF R 1 AND R 2 ARE SELECTED FOR THE OUTPUT VOLTAGE VIN Range (V)4 VOUT Range (V) Max Output Current (A)1 15.75 to 75 1.23 to 52 LT1952-1 8 to 75 3 LTC3706 LTC37263 Part Number Synchronous Operation Operating Frequency2 IQ (SUPPLY) Package 40 100kHz to 500kHz 5.2mA SSOP-16 1.23 to 52 40 100kHz to 500kHz 5.2mA SSOP-16 5 to 75 0.6 to 52 50 x 70kHz to 500kHz 4.2mA SSOP-24 5 to 75 0.6 to 52 50 x 70kHz to 500kHz 4.2mA SSOP-16 Forward Controllers LT1952 The maximum output current depends on the choice of external components. The frequency can be selected within the range indicated. 3 These ICs can be used in paralleled converters for higher current applications. 4 For higher input voltages, consult factory. 1 2 17 03 B u c k - B o o s t µ M o d u l e REGULATORS / C o n t r o l l e r s Synchronous Buck-Boost Linear offers high performance synchronous buck-boost µModule regulators and controllers that operate from input voltages that can be above, below or equal to the output voltage. These devices utilize a single inductor and can deliver efficiencies up to 98%. LTM®4609: Demo Board Part Number: DC1477A 30V/3A Buck-Boost with 10V to 36V Input Voltage VIN 10V TO 36V SW1 SW2 VIN 10µF 50V VOUT SENSE+ VFB LTM4607 LTM4609 15mΩ SS Part Number VIN Range (V) + 330µF 50V VOUT 30V 3A 2.74k SENSE– 0.1µF GND VOUT Range (V) Max Output Current (A)1 Frequency (kHz) Package Buck-Boost µModule Regulators LTM4605 4.5 to 20 0.8 to 16 5 (12 in Buck Mode) 200 to 400 15x15 LGA LTM4607 4.5 to 36 0.8 to 24 5 (10 in Buck Mode) 200 to 400 15x15 LGA LTM4609 4.5 to 36 0.8 to 34 4 (10 in Buck Mode) 200 to 400 15x15 LGA LTC3780 and LTM4609: Efficiency and Power Loss, VOUT = 30V at 3A 100 Simplified LTC3780 Buck-Boost Schematic VIN 4V - 36V 10 9 95 + + 7 90 6 5 85 4 80 75 SENSE- 3 BG2 2 TG2 0 5 Part Number 10 20 15 VIN (V) 25 30 35 SENSE+ BG1 LTC3780 GRND 1 70 VOUT 0.8V to 30V 8 POWER LOSS (W) EFFICIENCY (%) 18 02 TG1 VSENSE 0 VIN Range (V) VOUT Range (V) Max Output Current (A)1 Frequency (kHz) Package Buck-Boost Controllers LTC37802 4 to 36 0.8 to 30 15 200 to 400 5x5 QFN-32, SSOP-24 LTC3785 2.7 to 10 2.7 to 10 10 100 to 1MHz 4x4 QFN-24 Part Number VIN Range (V) VOUT Ratings Circuit Size (Inches) Description 2 Buck-Boost Demonstration Boards 1 2 DC1198A-A 4.5 to 20 12V/5A 1.50 x 0.875 LTM4605 Buck-Boost DC1198A-B 6 to 36 12V/5A 1.50 x 0.875 LTM4607 Buck-Boost DC1477A 10 to 36 30V/3A 1.50 x 0.875 LTM4609 Buck-Boost DC686A 5 to 32 12V/5A 1.50 x 1.50 LTC3780 Buck-Boost DC1163A 6 to 32 12V/12A 2.0 x 2.50 LTC3780 Buck-Boost DC1046A 36 to 72 48V/6A 2.0 x 2.0 LTC3780/LTC4440 Buck-Boost DC957 2.7 to 10 3.3V/3A 0.50 x 0.75 LTC3785 Buck-Boost Depends on external components. For higher current, consult factory. The input and output voltage can be extended by using external MOSFET drivers, like the LTC4440 and LTC4444. M o n o l i t h i c b u c k r e g u l at o r s H i g h v o lta g e l i n e a r r e g u l at o r s Monolithic Buck Regulators – High Voltage Monolithic buck regulators include the switching MOSFET or transistor, and the current sense resistor inside the device to simplify the circuit design. Shown below is a list of synchronous and non-synchronous parts used for up to 80V step-down regulation. 48V to 5V at 2A Step-Down Monolithic Converter BOOST VIN VIN 5.5V - 60V 4.7µF OFF ON LT3430 SHDN 0.68µF SW 22µH + BIAS VOUT 5V 2A 100µF 10V 15.4k SYNC FB GND 4.99k Part Number VIN Range (V) VOUT Range (V) Max Output Current (A) Operating Frequency (kHz) Synchronous Package Monolithic Buck Regulators – High Voltage LTC3632 4.5 to 50, 60pk 0.8 to VIN 0.02 50 to 580 X 3x3 DFN-8, MSOP-8E LTC3642 4.5 to 45, 60pk 0.8 to VIN 0.05 50 to 580 X 3x3 DFN-8, MSOP-8E LTC3631 4.5 to 45, 60pk 0.8 to VIN 0.10 50 to 580 X 3x3 DFN-8, MSOP-8E LT3990 4 to 60 1.12 to 30 0.35 250 to 2MHz 2x3 DFN-10, MSOP-10 LT3437 3.3 to 60,80pk 1.25 to 0.90VIN 0.40 200 TSSOP-16E, 3x3 DFN-10 LT1676 7.4 to 60 1.25 to 0.90VIN 0.44 100 SO-8 LT3991 4 to 60 1.12 to 30 1.2 200 to 2MHz 3x3 DFN-10, MSOP-10E LT1976/B 3.3 to 60 1.25 to 0.90VIN 1.20 200 TSSOP-16E LT1766 5.5 to 60 1.2 to 0.90VIN 1.20 200 TSSOP-16E LT3980 3.6 to 58, 80pk 0.79 to 30 2.2 250 to 2MHz 3x4 DFN-14, MSOP-16E LT3434 3.3 to 60 1.25 to 0.90VIN 2.75 200 TSSOP-16E LT3430/-1 5.5 to 60 1.22 to 0.90VIN 2.75 200/100 TSSOP-16E LT1074HV 8 to 60 2.21 to 0.85VIN 5.0 100 5-Lead TO-220, 7-Lead DD High Voltage Linear Regulators Linear Technology offers several very robust, high voltage LDO regulators with an 80V or higher input voltage rating. All devices are offered in a very compact and thermally efficient footprint, ensuring the highest reliability. Part Number Max Output Current (mA) Min VIN (V) Max VIN (V) Dropout Voltage (V at IOUT ) IQ (Supply) Shutdown Current VOUT Range (V) Max Junction Temp (˚C) Package High Voltage Linear Regulators LT3014/HV 20 3.0 80/100pk 0.35 7µA <1µA 1.22 to 60 125 ThinSOT, DFN-8 LT3014B/HV 20 3.0 80/100pk 0.35 7µA n/a 1.22 to 60 125 ThinSOT, DFN-8 LT3010/-5 50 3.0 80 0.30 30µA <1µA 1.275 to 60 125 MSOP-8E LT3010H 50 4.0 80 0.40 30µA <1µA 1.275 to 60 140 MSOP-8E LT3011 50 3.0 80 0.30 46µA <1µA 1.24 to 60 125 MSOP-12E, DFN-10 LT3011H 50 3.0 80 0.30 46µA <1µA 1.24 to 60 150 MSOP-12E LT3012 250 4.0 80 0.40 40µA <1µA 1.24 to 60 125 TSSOP-16E, DFN-12 LT3012B 250 4.0 80 0.40 40µA n/a 1.24 to 60 125 TSSOP-16E, DFN-12 LT3012H 200 4.0 80 0.40 40µA <1µA 1.24 to 60 140 TSSOP-16E LT3013 250 4.0 80 0.40 65µA <1µA 1.24 to 60 125 TSSOP-16E, DFN-12 LT3013B 250 4.0 80 0.40 65µA n/a 1.24 to 60 125 TSSOP-16E, DFN-12 200 4.0 80 0.40 65µA <1µA 1.24 to 60 140 TSSOP-16E 250 4.0 80 0.40 65µA <1µA 1.24 to 60 125 TSSOP-16E LT3013H LT3013MP 1 1 Tjunction = –55°C to 125°C 19 03 20 02 HIGH SPEED MOS F ET DRIVERS O p t o c o u p l e r D r i v e r / R e f e r e n c e V o lta g e High Speed MOSFET Drivers Synchronous Step-Down MOSFET Driver LTC4446 Fast Turn-On/Turn-Off DC Switch 12V VIN 100V (ABS MAX) VCC 7.2V TO 13.5V BOOST VCC PWM1 3 15k 200Ω VOUT BINP (FROM CONTROLLER IC) 0.33μF 6 BOOST 1 7 TG TINP 2 LTC4446 8 TS BINP VCC 4.7k 100k GND BG 4.7nF PWM2 Part Number 12V TG TINP LTC4444 TS (FROM CONTROLLER IC) 0.01μF 100V VIN 0V TO 100V 3.3nF 9 BG LOAD GND VCC Input Voltage Range (V) Maximun VIN Supply Voltage (V) Maximum Output Current/Impedance Source/Sink IQ (µA) Package Description High Speed MOSFET Drivers LTC1693-1 4.5 to 13.2 14 1.4A/1.7A 730 SO-8 Dual N-Channel Both Non-Inverting LTC1693-2 4.5 to 13.2 14 1.4A/1.7A 730 SO-8 Dual N-Channel 1 Non-Inverting, 1 Inverting LTC1693-3 4.5 to 13.2 14 1.4A/1.7A 730 MSOP-8 Single with Output Polarity Select LTC1693-5 4.5 to 13.2 14 1.4A/1.7A 360 MSOP-8 Single P-Channel Driver LTC4441/-1 5 to 8 28 6A/6A 250 MSOP-10E, SO-8 Low Side Driver LTC4440 7.3 to 15 80, 100pk 2.4A/1.5Ω 250 MSOP-8E, TSOT-23 High Side, High Voltage LTC4440-5 4 to 15 60, 80pk 1.1A/1.85Ω 200 MSOP-8E, TSOT-23 High Side, High Voltage LTC3900 4.5 to 11 12 2A/2A 500 SO-8 Synchronous Driver for Forward Converters LTC3901 4.5 to 11 12 2A/2A 500 SSOP-16 Synchronous Driver for Push-Pull and Full-Bridge Converters LTC4442/-1 6.2 to 9.5 38 2.4A/5A 730 MSOP-8E Synchronous Driver LTC4444 7.2 to 13.5 100 2.5A/2.5A 350 MSOP-8E Synchronous High Voltage Driver LTC4446 7.2 to 13.5 100 2.5A/3A 350 MSOP-8E High Side/Low Side Driver, Full-Bridge and DC Switch Applications LTC4444-5 4.5 to 13.5 100 1.4A/1.75A 320 MSOP-8E Synchronous High Voltage Driver with Lower VCC Voltage Optocoupler Driver/Reference Voltage The LT4430 drives optoisolators that cross the isolation barrier in an isolated power supply. The IC contains a precision-trimmed reference and a high bandwidth error amplifier. The LT1431 is an adjustable shunt voltage regulator with 100mA sink capability and ±0.2% initial reference voltage accuracy. Typical Optoisolator Drive Circuit ISOLATION BARRIER VIN + + LT1952 VCC VIN OPTO LT4430 OC Part Number Driver Current Limit (mA) FB Initial Accuracy Tolerance Over Temp Range Reference Voltage (V) Package Optocoupler Driver/Reference Voltage LT4430 10 +/-0.75% +/-1.25% (-40˚C to 125˚C) 0.6 ThinSOT™ LT1431 100 +/-0.2% +/-1.4% (-40˚C to 85˚C) 2.5 S-8/N-8/TO-92 VOUT Power Over Ethernet controllers Power over Ethernet Controllers Building on industry-leading Hot Swap technology, Linear Technology offers cost effective solutions for delivering Power over Ethernet (PoE), including controllers for Power Sourcing Equipment (PSE) and Powered Devices (PD). Linear Technology offers both single and multiport PSE controllers to satisfy any PoE requirement. The LTC4263-1 is an autonomous single-channel PSE controller for use in IEEE 802.3af compliant PoE systems. It includes an onboard power MOSFET, inrush current limit and short-circuit control, and PD detection and classification circuitry. Onboard control algorithms provide complete IEEE 802.3af compliant operation without the need for a microcontroller. The LTC4263-1 simplifies PSE implementation, requiring only a single 48V supply and a few passive support components. The LTC4266 quad, high power PSE controller meets the requirements of the new IEEE 802.3at (PoE+) specification and includes advanced features such as true 14-bit port current and voltage readback, programmable power levels for enforcing classification, and industryleading power efficiency. Linear Technology offers a wide array of solutions for PD applications, including the new, high power LTC4269 PD with integrated switcher family. The LTC4269 family offers IEEE 802.3at compatibility, flexible auxiliary power options and switcher efficiencies as high as 96%. LTC4269-1/-2: IEEE 802.3at PD Controllers with Integrated Switchers 95 Features: 90 25.5W IEEE 802.3at Compliant (Type-2) PD • IEEE 802.3at High Power Available Indicator • Integrated Synchronous No-Opto Flyback Controller or Synchronous Forward Controller • Superior EMI Performance • Programmable Soft-Start and Switching Frequency • Flexible Integrated Auxiliary Power Support • Robust 100V Integrated Hot Swap MOSFET 85 EFFICIENCY (%) • Efficiency vs Load Current 80 75 65 • Undervoltage, Overvoltage and Thermal Protection • Available in Compact 32-Pin 7mm x 4mm DFN Package 42V 50V 57V 70 0.5 1 1.5 2.5 2 3 3.5 4 4.5 5 LOAD (A) PSE PD RETURN SPARE PAIR VDD Tx Rx DATA PAIR LTC4266 PSE CONTROLLER Rx Tx VPORTP RCLASS DATA PAIR LTC4269 VEE PD CONTROLLER/SWITCHER SENSE GATE VPORTN SPARE PAIR – 54V 0.25 OPTIONAL AUXILIARY POWER Part Number PSE/PD Channels Description IEEE-Compliant Detection IEEE-Compliant Disconnection Package High Power PoE Products LTC4264 PD 1 High Power PD Interface Controller (35W) Yes (Internal 25K resistor) N/A 4x3 DFN-12 LTC4265 PD 1 IEEE 802.3at High Power PD Interface Controller (>25.5W) Yes, 2-Event Classification N/A 4x3 DFN-12 LTC4268-1 PD 1 High Power PD Interface Controller with Integrated Synchronous Switching Regulator (35W) Yes (Internal 25K resistor) N/A 7x4 DFN-32 LTC4269-1/2 PD 1 IEEE 802.3at High Power PD Interface Controller and Integrated Switching Regulator with Aux Support (>25.5W) Yes, 2-Event Classification N/A 7x4 DFN-32 LTC4278 PD 1 IEEE 802.3at High Power PD and Synchronous No-Opto Flyback Controller with 10V Aux Support (>25.5W) Yes, 2-Event Classification N/A 7x4 DFN-32 LTC4263-1 PSE 1 Single IEEE 802.3af PSE Controller with Internal Switch (30W) Yes Yes (DC or ACCurrent) 4x3 DFN-14 SO-14 LTC4266 PSE 4 Quad IEEE 802.3at PSE Controller with DC Disconnect (30W and Proprietary High Power Levels) Yes, 2-Event Classification Yes (DC-Current) 7x7 QFN SSOP-36 VOUT 21 03 22 02 RUGGED SERIAL INTER FA C E TRANS C EIVERS Rugged Serial Interface Transceivers Linear Technology offers a broad selection of industry standard, low power RS485/RS422, RS232/RS562 and CAN interface transceivers featuring high ESD protection, high speed and high voltage versions for rugged environments. Our family of RS485 transceivers includes models that feature fail-safe receiver inputs that guarantee a receiver output high for shorted, open or inactive data lines. Select models feature slew rate limiting to lower EMI, while others include a receiving logic-selectable 120Ω termination. All devices are designed to operate in systems with either 3.3V or 5V supplies, possess a maximum data rate of 20Mbps and maintain a high input impedance capable of supporting up to 256 nodes. Fault-protected devices are equipped with ±60V overvoltage protection, eliminating a common cause of failure, cross-wiring bus terminals to a supply rail. Our transceivers are equipped with enhanced on-chip ESD protection, up to ±25kV HBM, which guarantees no damage or latchup can occur. LTC2854: 3.3V 20Mbps RS485/RS422 Transceiver with Integrated Switchable Termination Features: • Integrated, Logic-Selectable 120Ω Termination Resistor • 3.3V Supply Voltage • 20Mbps Maximum Data Rate • No Damage or Latchup Up to ±25kV HBM • High Input Impedance Supports 256 Nodes (C, I-Grade) • Operation Up to 125°C (H-Grade) • Guaranteed Failsafe Receiver Operation Over the Entire Common Mode Range • Current Limited Drivers and Thermal Shutdown • Delayed Micropower Shutdown: 5µA Maximum (C, I-Grade) • Power Up/Down Glitch-Free Driver Outputs • Low Operating Current: 370µA Typical in Receive Mode • Compatible with TIA/EIA-485-A Specifications RS485 Transceivers with Integrated Switchable Termination LTC2854 LTC2854 DE DI R R RO RE TE RO RE TE 120Ω 120Ω DE D D LTC2854 120Ω R D RO RE TE DE DI DI RUGGED SERIAL INTER FA C E TRANS C EIVERS Part Number Standard Bus Voltage Protection ESD Maximum Ambient Temperature Description Packages Fault-Protected Transceivers LT1785 RS485 ±60V ±15kV 85°C Standard Pinout, Half-Duplex SO-8, DIP-8 LT1796 CAN ±60V ±15kV 85°C Standard SO-8 Pinout, 125kBaud SO-8, DIP-8 Part Number Number of Drivers Number of Receivers Supply Voltage (V) Power (mW) ESD Driver Disable Shutdown Packages RS232/RS562 Transceivers LTC2801/2 1 1 1.8 8 ±10kV Yes Yes 4x3 DFN-12 LT1781 2 2 5 40 ±15kV No No SO-16, SW-16, N-16 LTC2803/4 2 2 1.8 8 ±10kV Yes Yes 5x3 DFN-16, SSOP-16 LT1137A 3 5 5 60 ±15kV Yes Yes SSOP-28, SW-28, N-28 LTC1348 3 5 3 1.5 ±10kV No Yes SSOP-28, SW-28 Part Number Number of Drivers Number of Receivers Configuration Supply Voltage (V) Max Data Rate (Mbps) ESD Temperature Grades Description Packages RS485/RS422 Transceivers LTC1480 1 1 Half-Duplex 3.3 2.5 ±10kV I 3.3V Operation SO-8, DIP-8 LTC1535 1 1 Full-Duplex 5 0.35 ±8kV I 2500V Isolation SO-28 LT1785 1 1 Half-Duplex 5 0.25 ±15kV I +/-60V Fault-Protected, Failsafe SO-8, DIP-8 LT1791 1 1 Full-Duplex 5 0.25 ±15kV I +/-60V Fault-Protected, Failsafe SO-14, DIP-14 LTC2852 1 1 Full-Duplex 3.3 20 ±15kV I, H 3.3V, 20Mbps, Failsafe DFN-10, MS-10, SO-14 LTC2854 1 1 Half-Duplex 3.3 20 ±15kV I, H 3.3V 20Mbps, Integrated Switchable Termination DFN-10 LTC2858-1/-2 1 1 Full-Duplex 5 20 ±15kV I, H 20Mbps (-1) or 0.25Mbps (-2), Failsafe, SR Limited 15kV MS-10, DFN-10 LTC2861 1 1 Full-Duplex 5 20 ±15kV I 20Mbps, Integrated Switchable Termination DFN-12, SSOP-16 Part Number Number of Drivers Number of Receivers Supply Voltage (V) ESD (kV) Protocols Supported Packages Multiprotocol Transceivers LTC1387 2 2 5 ±4kV RS232, RS422, RS485 SSOP-20, SW-20 LTC1334 4 4 5 ±4kV RS232, RS422, RS485 SSOP-28, SW-28, N-28 23 03 03 24 02 I 2 C AND SMBUS BU F F ERS AND A C C ELERATORS I2C and SMBus Buffers and Accelerators Linear Technology bus buffers and rise time accelerators offer capacitive isolation and active pull-up currents to eliminate common 2-wire bus problems that occur when many nodes are added to a system management bus such as I2C or SMBus. These busses are commonly used in high availability (Hot Swap) environments. The enhanced data transmission speed and reliability, coupled with robust ESD structures, makes these devices suitable for many industrial applications. LTC4309: Level Shifting Low Offset Hot Swap Capable 2-Wire Bus Buffer with Stuck Bus Recovery Features: Level Shifting with LTC4309 • Bidirectional Buffer Increases Fanout • 60mV Buffer Offset Independent of Load • Optional Disconnect when Bus is Stuck Low • Prevents SDA and SCL Corruption During Live Board Insertion and Removal from Backplane • Level Shift 2.5V, 3.3V and 5V Busses • Compatible with Non-Compliant VOL I²C Devices • ±6kV Human Body Model ESD Ruggedness • Isolates Input SDA and SCL Lines from Output • Compatible with I²C, I²C Fast-Mode and SMBus SDA1 • READY Open Drain Output SCL1 • FAULT Open Drain Output • 1V Precharge on All SDA and SCL Lines • Optional Rise Time Accelerators • High Impedance SDA, SCL Pins for VCC = 0 • Available in Small 12-Pin DFN (4mm x 3mm) and 16-Lead SSOP Packages 5V 3.3V VCC2 VCC DISCEN ENABLE READY LTC4309 FAULT SDAIN SDAOUT SDA2 SDAIN SCLOUT SCL2 GND ACC Stuck Bus Resolved with Automatic Clocking SDAOUT 5V/DIV SDAIN 5V/DIV RECOVERS STUCK LOW > 30ms DISCONNECT AT TIMOUT AUTOMATIC CLOCKING SCLOUT 5V/DIV FAULT 5V/DIV Part Number Bus Buffer Rise Time Acceleration Level Translation Maximum Data Rate ESD Description Packages 400kHz ±8kV Low Voltage I2C/SMBus Accelerator 2x2 DFN-6, SC70 400kHz ±15kV Hot Swap Capable, Stuck Bus Recovery MSOP-8, 3x3 DFN-8 I C and SMBus Buffers and Accelerators 2 LTC4311 No Yes No LTC4303 Yes Yes 3.3V to 5V LTC4306 Yes Yes 3.3V to 5V 400kHz ±10kV 4-Channel, 2-Wire Bus Multiplexer with Capacitance Buffering SSOP-24, 4x5 QFN-24 LTC4307 Yes Yes No 400kHz ±5kV Low Offset, Hot Swap Capable, Stuck Bus Recovery MSOP-8, 3x3 DFN-8 LTC4308 Yes Yes 1V to 2.5V/5V 400kHz ±6kV Optimized for Low Voltage Systems Down to 0.9V MSOP-8, 3x3 DFN-8 LTC4309 Yes Yes 2.5V/3.3V/5V 400kHz ±6kV Low Offset, Hot Swap Capable, Stuck Bus Recovery, Fault Flag SSOP-16, 4x3 DFN-12 Buffer VCC < = VBUS 1 1 V o lta g e m o n i t o r s a n d s u p e r v i s o r s System Monitoring and Control Linear Technology’s System Monitoring and Control portfolio includes an extensive selection of power supply voltage supervisors, power monitors, trackers, margining controllers, sequencers and pushbutton controllers designed to simplify system control. All of these devices improve DC/DC converter functionality and feature a high degree of accuracy, integration and configurability, resulting in costefficient designs and simplified system circuitry. The System Monitor and Control family provides convenient all-in-one solutions for many of today’s growing digital power management applications. Voltage Monitors and Supervisors This family includes power supply voltage monitors ranging from 0.5V to 27V, with integration of up to eight supply monitors in tiny packages. Many of these devices feature adjustable inputs, accurate user-selectable voltage thresholds, UV/OV/Negative monitoring, watchdog timers and low supply currents. LTC2930: Configurable Six Supply Monitor with Adjustable Reset Timer and Manual Reset Features: Six Supply Monitor, 5% Threshold 12V, 5V, 3.3V, 1.8V, 1.2V, –5.2V • Simultaneously Monitors Six Supplies • 16 User Selectable Combinations of 5V, 3.3V, 3V, 2.5V, 1.8V, 1.5V and ± Adjustable Voltage Thresholds • Guaranteed ±1.5% Threshold Accuracy • Adjustable Reset Timeout • Low Supply Current: 52μA • Manual Reset Pin • Power Supply Glitch Immunity • Guaranteed RST for VCC ≥ 1V • High Temperature Operation up to 125°C • 12-Pin 3mm x 3mm DFN Package 12V 5V 3.3V 1.8V SYSTEM LOGIC 1.2V –5.2V 2150k 1% 487k 1% V1 V2 V3 124k 1% 0.1µF V4 V5 121k 1% 100k 1% 100k 1% 16.2k 1% RST LTC2930 V6 MR VREF VPG Number of Supplies Overvoltage Monitoring Negative Monitoring Watchdog Timer Reset Pulse Width Temperature Grades CRT MANUAL RESET CRT 47nF 86.6k 1% Part Number GND tRST = 94ms Description Packages Voltage Monitors and Supervisors LTC2917/2918 1 No No Yes Adj C, I, H Low Voltage with 27 Selectable Thresholds and Watchdog Timer MS-10, DFN-10 LTC2904/05 2 No No No 200ms/Adj C, I Pin-Selectable Thresholds and Tolerances of 5%, 7.5%, 10% SOT-23-8 DFN-8 LTC1326/-2.5 3 No No No 200ms C, I Long Duration Manual Reset Input SO-8, MS-8 LTC2914 4 Yes Yes No Adj C, I, H Quad UV/OV Positive/Negative Voltage Monitor SSOP-16 DFN-16 LTC2908 6 No No No 200ms C, I Precision Six Supply Monitor SOT-23-8 DFN-8 LTC2931/2932 6 No Yes Yes Adj C, I, H Configurable Supplies, Adj Reset Timer and Supply Tolerance TSSOP-20 LTC2910 8 Yes Yes No Adj C, I, H Octal Positive/Negative Voltage Monitor SSOP-16 DFN-16 25 03 26 02 Pushbutton controllers Pushbutton Controllers Pushbutton controllers enable control for DC/DC converters, processor interrupt logic and adjustable on/off timers. They easily solve the inherent bounce problem associated with all mechanical contacts, while also enabling power supply converters and releasing a processor once the supply is fully powered up. These parts offer wide supply voltage range, small size, low quiescent current and ease of design when compared to discrete solutions. LTC2953: Pushbutton On/Off Controller with Voltage Monitoring Features: Pushbutton On/Off Control with UVLO and Power Fail Comparator • Wide Operating Voltage Range: 2.7V to 27V • Pushbutton Control of System Power • Low Supply Current: 14µA • Power Fail Comparator Generates Warning • UVLO Comparator Gracefully Latches Power Off • Adjustable Supply Monitor with 200ms Reset • Adjustable Power Down Timer • Low Leakage EN Output (LTC2953-1) Allows DC/DC Converter Control • + 8.4V Simple Interface Allows Orderly System Power Up and Power Down • ±1.5% Threshold Tolerances • ±10kV ESD HBM on PB Input Part Number Supply Voltage Range 100k 2150k UVLO VIN 100k VM LTC2953-1 196k 3.3V SHDN 499k PFI DC/DC EN 23.2k 100k 100k 100k High Voltage EN Output (LTC2953-2) Allows Circuit Breaker Control • VOUT VIN ON/OFF PB RST PFO INT KILL GND PDT RST GPIO INT KILL SYSTEM LOGIC t PDT = 6.4 SECONDS ISUPPLY (µA) Description Packages Pushbutton Controllers LTC2950 2.7V to 26V 6 Active H/L Enable Output with Adjustable Pushbutton On/Off Debounce Timers 3x2 DFN-8, SOT-23 LTC2951 2.7V to 26V 6 Active H/L Enable Output with Adjustable Pushbutton Off/Kill Timers 3x2 DFN-8, SOT-23 LTC2952 2.7V to 28V 25 Pushbutton PowerPathTM Controller with Supervisor TSSOP-20, 4x4 QFN-20 LTC2953 2.7V to 27V 14 Adjustable Power Supply Monitoring with UVLO and Power Fail Comparators 3x3 DFN-12 LTC2954 2.7V to 26V 6 Adjustable On/Off Debounce Timers. Interrupt Logic Ideal for Menu Driven Applications 3x2 DFN-8, SOT-23 C o u l o m b C o u n t e r / B at t e ry G a s G a u g e H i g h V o lta g e I 2 C C u r r e n t a n d v o lta g e m o n i t o r LTC4150: Coulomb Counter/Battery Gas Gauge The LTC4150 measures battery depletion and charging in handheld PC and portable product applications. The device monitors current through an external sense resistor between the battery’s positive terminal and the battery’s load or charger. A voltage-to-frequency converter transforms the current sense voltage into a series of output pulses at the interrupt pin. These pulses correspond to a fixed quantity of charge flowing into or out of the battery. The part also indicates charge polarity as the battery is depleted or charged. The LTC4150 is intended for 1-cell or 2-cell Li-Ion and 3-cell to 6-cell NiCd or NiMH applications. Features: • Indicates Charge Quantity and Polarity • ±50mV Sense Voltage Range • Precision Timer Capacitor or Crystal Not Required • 2.7V to 8.5V Operation • High Side Current Sense • 32.55Hz/V Charge Count Frequency • • 1.5µA Shutdown Current LTC4150 Measures Battery Depletion and Charging CHARGER RSENSE + LOAD 4.7µF SENSE– SENSE+ 4.7µF 10-Lead MSOP Package CF+ RL RL VDD INT LTC4150 CF– CLR CHG µP DISCHG POL SHDN GND LTC4151: High Voltage I2C Current and Voltage Monitor The LTC4151 and LTC4151-1 are high side power monitors that operate over a wide voltage range of 7V to 80V. In default operation, the onboard 12-bit ADC continuously measures high side current, input voltage and an external voltage. Data is reported through the I2C interface when polled by a host. The monitors can also perform on-demand measurement in a snapshot mode. The LTC4151 features a dedicated shutdown pin to reduce power consumption. The LTC4151-1 features split I2C data pins with data in and an inverted data output to drive optoisolators. Features: • Wide Operating Voltage Range: 7V to 80V • 12-Bit Resolution for Both Current and Voltages • I C Interface • Additional ADC Input Monitors an External Voltage • Continuous Scan and Snapshot Modes • Shutdown Mode (LTC4151) Reduces Quiescent Current to 120μA 2 • Split SDA for Optoisolation (LTC4151-1) • Tiny 10-Lead MSOP and 3mm × 3mm DFN Packages High Side Power Sensing with Onboard ADC and I2C 0.02 VIN 7V to 80V 3.3V VOUT SENSE+ SENSE– 2k VIN VDD 2k µCONTROLLER SHDN SCL SCL ADR1 SDA SDA ADR0 ADIN LTC4151 GND MEASURED VOLTAGE 27 03 28 02 s u p p ly t r a c k e r s , s e q u e n c e r s a n d m a r g i n i n g c o n t r o l l e r s Supply Trackers, Sequencers and Margining Controllers Energy efficiency and power consumption are critical factors in today’s electronic designs. With many different voltage rails supplying large load currents, managing power consumption and optimizing, overall efficiency can be a challenge. This family of power supply controllers allows users to select the sequence of power supply ramp-up and ramp-down, and actively control the outputs, including support for DC/DC converter modules. In addition, users have the option of tracking supplies in a coincident, offset or ratiometric fashion, as well as margining the supplies, and allow for the testing of supply voltage limits as specified by the system. The LTC2970 and LTC2978, dual and octal controllers, offer digital power management of analog supplies to ensure precise trimming, margining and monitoring using on-chip high resolution ADCs and DACs. The LTC2970/LTC2978 work with almost any power supply, allowing designers to choose the optimal DC/DC converter that provides smooth control of the output voltage and a fast transient response. An on-chip reference and high accuracy Δ∑ A/D converter ensure accurate measurements of supply voltages, load currents or temperature. Voltage-buffered DACs drive the supplies’ feedback nodes for improved accuracy and can be programmed by a slow, linear voltage servo to trim and margin the output voltages. This is extremely useful in determining the load’s sensitivity to the power supply during the prototype phase or to test for manufacturing variations in production. Extensive, user-configurable fault monitoring provides increased reliability, alerting a system’s host to incipient failures before they occur. The LTC2978 also includes a configuration EEPROM with fault logging. The Δ∑ ADC architecture was specifically chosen to average out power supply noise and allow fast transients. The point of load ground reference for the DAC outputs minimizes errors that would otherwise occur in a power system that experiences ground bounce. LTC2978: Octal PMBus Power Supply Monitor and Controller with EEPROM Octal PMBus Digital Power Supply Monitor and Controller VIN 4.5V < VIBUS < 15V Features: • PMBus Compliant Interface and Command Set • Configuration EEPROM • Fault Logging to Internal EEPROM • Differential Input, 15-Bit Δ∑ ADC with Less Than ±0.25% of Total Unadjusted Error • Monitors Eight Output Channels and One Input Voltage 8-Channel Sequencer • Total Supplies Supply Voltage (V) Eight UV/OV Voltage Supervisors • Eight 10-Bit Voltage-Buffered IDACs with Soft Connect • • Programmable Watchdog Timer Part Number • VIN 0.1µF VPWR On-Chip Digital Temperature Sensor 64-Pin 9mm × 9mm QFN Package Tracking via DC/DC Feedback Sequencing R30 VSENSEP0 R20 VDD33 VDD25 LTC2978* 0.1µF DC/DC CONVERTER VFB LOAD R10 VDACM0 VSENSEM0 SGND VOUT_END RUN/SS GND GND Supports Multichannel Fault Management • VOUT VDACP0 VDD33 Linear, Voltage Servo Adjusts Supply Voltages by Ramping Voltage-Buffered IDAC Outputs Up/Down • VIN_SNS *SOME DETAILS OMITTED FOR CLARITY ONLY ONE OF EIGHT CHANNELS SHOWN Input Monitors Margining PWRGD Description Package Supply Tracker, Sequencers and Margining Controllers LTC2970 2 5 or 12 Coincident, Up and Down (LTC2970-1 Only) Yes 6 (14-Bit ADC) Yes (8-Bit DAC) Yes Dual Digital Power Monitor and Margining Controller, ±0.5% Unadjusted Error, Internal Temp Sensor, Automatic Servo to Programmed Voltage, UV/OV and Current Measurements. I2C Interface 4x5 QFN-24 LTC2978 8 3 to 15 No Yes 9 (15-Bit ADC) Yes (10-Bit DAC) Yes Octal PMBus Digital Power Monitor and Margining Controller, Configurable EEPROM, ±0.5% Unadjusted Error, Internal Temp Sensor, Automatic Servo to Programmed Voltage, Fault Logging, UV/OV and Current Measurements 9x9 QFN-64 LTC2923 3 2.9 to 5.5 Flexible1 Yes 0 No No Tracking for Two Supplies without Series FET or a Third Supply with a series FET 4x3 DFN-12 MSOP-10 LTC2928 4 2.9 to 16.5 No Yes 4 No Yes H/W Configuration of Power Turn-On/Off Sequence with Adjustable Time Positions. SSOP-36 5 x 7 DFN-38 LTC2924 4 3 to 6.5 No Yes 4 No No On/Off Power Supply Sequencer SSOP-16 Flexible Tracking = Coincident, Ratiometric or Offset 1 S a les Offices NORTH AMERI CA NORTHERN CALIFORNIA/NEVADA Bay Area 720 Sycamore Dr. Milpitas, CA 95035 Tel: (408) 428-2050 Fax: (408) 432-6331 Sacramento / Nevada 2260 Douglas Blvd., Ste. 280 Roseville, CA 95661 Tel: (916) 787-5210 Fax: (916) 787-0110 Indiana Tel: (847) 925-0860 Iowa Tel: (847) 925-0860 Kansas Tel: (913) 829-8844 Minneapolis 7805 Telegraph Rd., Ste. 225 Bloomington, MN 55438 Tel: (952) 903-0605 Wisconsin Tel: (262) 859-1900 PACIFI C N O RT H W E S T N O RT H E A S T A R E A Denver 7007 Winchester Cir., Ste. 130 Boulder, CO 80301 Tel: (303) 926-0002 Fax: (303) 530-1477 Boston 15 Research Place North Chelmsford, MA 01863 Tel: (978) 656-4750 Fax: (978) 656-4760 Portland 5005 SW Meadows Rd., Ste. 410 Lake Oswego, OR 97035 Tel: (503) 520-9930 Fax: (503) 520-9929 Salt Lake City Tel: (801) 731-8008 Connecticut Tel: (860) 228-4104 Seattle 2018 156th Ave. NE, Ste. 100 Bellevue, WA 98007 Tel: (425) 748-5010 Fax: (425) 748-5009 SOUTH W E S T A R E A Los Angeles 21243 Ventura Blvd., Ste. 238 Woodland Hills, CA 91364 Tel: (818) 703-0835 Fax: (818) 703-0517 Orange County 15375 Barranca Pkwy., Ste. 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