LTC3428 4A, 2MHz Dual Phase Step-Up DC/DC Converter in 3mm × 3mm DFN DESCRIPTIO U FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ The LTC®3428 is a 2-phase, current mode boost converter, capable of supplying 2A at 5V from a 3.3V input. Two 93mΩ, 2A N-channel MOSFET switches allow the LTC3428 to deliver high efficiency from input voltages as low as 1.6V. High Efficiency: Up to 92% 2-Phase Control Reduces Output Voltage Ripple 5V at 2A from 3.3V Input 3.3V at 1.5A from 1.8V Input 1.6V to 5.25V Adjustable Output Voltage 1.6V to 4.5V Input Range Internal Soft-Start Operation Low Shutdown Current: <1µA Uses Small Surface Mount Components 10-Pin 3mm × 3mm DFN Package External parts count and size are minimized by a 1MHz switching frequency and a 2-phase design. Two phase operation significantly reduces peak inductor currents and capacitor ripple current, doubling the effective switching frequency and minimizing inductor and capacitor size. External compensation allows the feedback loop response to be optimized for a particular application. U APPLICATIO S ■ ■ ■ ■ ■ Networking Equipment Handheld Instruments Digital Cameras Distributed Power Local 3.3V to 5V Conversion Other features include: an active low shutdown pin reduces supply current to below 1µA, internal soft-start, antiringing control and thermal shutdown. The LTC3428 is available in a low profile (0.75mm) 10-lead (3mm × 3mm) DFN package. , LTC and LT are registered trademarks of Linear Technology Corporation. U TYPICAL APPLICATIO Efficiency vs Load Current 3.3V to 5V at 2A Converter 95 VIN 3.3V 90 85 VOUT VIN OFF ON SHDN VC 10k 1000pF 22pF SWA LTC3428 AGND PGNDA SWB 2.2µH* VOUT 5V/2A ** 383k ** 80 75 70 65 60 FB PGNDB EFFICIENCY (%) 2.2µH* 4.7µF*** 121k 22µF**** 55 VIN = 3.3V VOUT = 5V L = 2.2µH 50 * TOKO FDV06302R2 ** PHILIPS PMEG1020 *** TAIYO YUDEN X5R JMK212BJ475MD **** TAIYO YUDEN X5R JMK316BJ226ML 3428 TA01 45 0.1 1 2 LOAD CURRENT (A) 3428 TA02 3428f 1 LTC3428 U W W W ABSOLUTE AXI U RATI GS U W U PACKAGE/ORDER I FOR ATIO (Note 1) VIN, VOUT, SWA, SWB Voltage ....................... – 0.3 to 6V SWA, SWB Voltage, Pulsed, <100ns ......................... 7V SHDN, VC Voltage ......................................... – 0.3 to 6V FB Voltage ................................... – 0.3 to (VOUT + 0.3V) Operating Temperature Range (Note 2) .. – 40°C to 85°C Storage Temperature Range ..................–65°C to 125°C ORDER PART NUMBER TOP VIEW 10 PGNDB PGNDA 1 SWA 2 VOUT 3 SHDN 4 8 VIN 7 AGND VC 5 6 FB 9 SWB 11 LTC3428EDD DD PART MARKING DD PACKAGE 10-LEAD (3mm × 3mm) PLASTIC DFN EXPOSED PAD MUST BE SOLDERED TO GROUND PLANE ON PCB TJMAX = 125°C, θJA = 45°C/W, θJC = 3°C/W LBBG Consult LTC Marketing for parts specified with wider operating temperature ranges. ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 3.3V, VOUT = 5V unless otherwise noted. PARAMETER CONDITIONS MIN Minimum Startup Voltage Quiescent Current, VOUT Quiescent Current, VIN SHDN = VIN SHDN = VIN Shutdown Current SHDN = 0V Switching Frequency Per Phase FB Regulated Voltage FB Input Current MAX 1.5 1.6 V 100 1.3 200 2.0 µA mA 1 µA 0.8 1.0 1.2 ● 1.219 1.243 1.268 V 1 50 nA VFB = 1.24V 170 Output Adjust Voltage 1.6 VSWA, VSWB = 5.5V, Per Phase NMOS Switch On Resistance VOUT = 5V, Per Phase NMOS Current Limit Per Phase UNITS ● Error Amp Transconductance NMOS Switch Leakage TYP 0.1 MHz µS 5.25 V 2.5 µA 0.093 Ω ● 2 2.5 A ● 0.4 0.8 1.5 V 0.01 1 µA Maximum Duty Cycle ● 80 Minimum Duty Cycle ● SHDN Input Threshold SHDN Input Current Current Limit Delay to Output (Note 3) Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: The LTC3428E is guaranteed to meet performance specifications from 0°C to 70°C. Specifications over the –40°C to 85°C operating temperature range are assured by design, characterization and correlation with statistical process controls. 87 % 0 40 % ns Note 3: Specification is guaranteed by design and not 100% tested in production. Note 4: This IC includes overtemperature protection that is intended to protect the device during momentary overload conditions. Junction temperature will exceed 125°C when overtemperature protection is active. Continuous operation above the specified maximum operating junction temperature may impair device reliability. 3428f 2 LTC3428 U W TYPICAL PERFOR A CE CHARACTERISTICS All characteristic curves at TA = 25°C unless otherwise noted. SW Pin and Inductor Current in Discontinuous Mode, Demonstrating Anti-Ring Circuit Operation SWA, SWB Switching Waveforms 100mV/DIV 2V/DIV SWA Transient Response, 0.5A to 1.5A 5V/DIV SWB 500mA/DIV 500mA/DIV 500ns/DIV 500ns/DIV 100µs/DIV 3428 G01 3428 G02 Output Voltage Ripple with 22µF Ceramic Capacitor 3428 G03 Switch RDS(ON) vs VOUT Converter Efficiency 95 108 3.3V TO 5V 106 90 104 50mV/DIV 102 2.5V TO 3.3V 80 RDS(ON) (mΩ) EFFICIENCY (%) 85 2.5V TO 5V 75 70 100 98 96 94 65 92 60 90 55 0.05 500ns/DIV 0.1 1 88 2.5 2 3.0 LOAD CURRENT (A) 3428 G04 3428 G05 SWA, SWB Rise Time, I = 2A Switch RDS(ON) vs Temperature Feedback Voltage vs Temperature 1.27 1.26 100 FB VOLTAGE (V) RDS(ON) (mΩ) 110 90 80 60 –45 –25 –5 3428 G07 1.25 1.24 1.23 70 10ns/DIV 5.0 3428 G06 120 1V/DIV 4.0 4.5 3.5 OUTPUT VOLTAGE (V) 15 35 55 75 TEMPERATURE (°C) 95 115 3428 G08 1.22 –45 –25 –5 15 35 55 75 TEMPERATURE (°C) 95 115 3428 G09 3428f 3 LTC3428 U W TYPICAL PERFOR A CE CHARACTERISTICS Peak Current Limit vs Temperature 3.4 PEAK CURRENT LIMIT (A) 3.2 3.0 2.8 2.6 2.4 2.2 2.0 –45 –25 35 15 55 –5 TEMPERATURE (°C) 75 95 3428 G10 U U U PI FU CTIO S PGNDA, PGNDB (Pins 1, 10, 11 (Exposed Pad)): Power Ground for the IC. Tie directly to local ground plane. SWB (Pin 2), SWA (Pin 9): Phase B and Phase A Switch Pins. The inductor and Schottky diodes for each phase are connected to these pins. Minimize trace length to reduce EMI. VOUT (Pin 3): Power Supply Output and Bootstrapped Power Source for the IC. Connect low ESR output filter capacitors from this pin to the ground plane. SHDN (Pin 4): Shutdown Pin. Grounding this pin shuts down the IC. Connect to a voltage greater than 1.5V to enable. VC (Pin 5): Error Amp Output. A frequency compensation network is connected to this pin to compensate the boost converter loop. FB (Pin 6): Feedback Pin. A resistor divider from VOUT is connected here to set the output voltage according to VOUT = 1.243 • (1 + R1 / R2) AGND (Pin 7): Signal Ground for the IC. Connect to ground plane near feedback resistor divider. VIN (Pin 8): Input Supply Pin. Bypass VIN with a low ESR ceramic capacitor of at least 4.7µF. X5R and X7R dielectrics are preferred for their superior voltage and temperature characteristics. 3428f 4 LTC3428 W BLOCK DIAGRA FB FB ERROR AMPLIFIER/SOFT-START VIN – VC + 1.243V VOUT CURRENT LIMIT ISENB RAMP/ SLOPE COMP – – + ISENB SWB PWM COMP PWM LOGIC PGNDB DRIVER CLK B CHANNEL B OSCILLATOR CHANNEL A TSD CLK A SWA RAMP/ SLOPE COMP ISENA SHDN PWM COMP PGNDA DRIVER SHUTDOWN CURRENT LIMIT VC AGND + – – PWM LOGIC 5pF ISENA 3428 BD 3428f 5 LTC3428 U W U U APPLICATIO S I FOR ATIO DETAILED DESCRIPTION The LTC3428 provides high efficiency, low noise power for high current boost applications. A current mode architecture with adaptive slope compensation provides both simple loop compensation as well as excellent transient response. The low RDS(ON) switches provide the pulse width modulation control at high efficiency. Oscillator: The per phase switching frequency is internally set to a nominal value of 1MHz. Current Sensing: Lossless current sensing converts the peak current signal to a voltage which is summed with the internal slope compensation. This summed signal is then compared with the error amplifier output to provide a peak current command for the PWM. Slope compensation is internal to the IC and adapts to changes to the input voltage, allowing the converter to provide the necessary degree of slope compensation without causing a loss in phase margin in the loop characteristic. Error Amplifier: The error amplifier is a transconductance amplifier with a transconductance (gm) = 1/7.5kΩ. A simple compensation network is placed from VC to ground. The internal 5pF capacitor between VC and ground will often simplify the external network to a simple R-C combination. The internal 1.243V reference voltage is compared to the voltage on FB to generate an error signal at the output of the error amplifier (VC). A voltage divider from VOUT to ground programs the output voltage from 1.6V to 5.25V using the equation: Anti-Ringing Control: The antiringing control places an impedance across the inductor of each phase to damp the high frequency ringing on the SWA, SWB pins during discontinuous mode operation. The LC ringing on the switch pin due to the inductor and switch pin capacitance is low energy, but can cause EMI radiation. 2-Phase Operation The LTC3428 uses a two-phase architecture, rather than the conventional single phase architecture used in most other boost converters. The two phases are spaced 180° apart. Two phase operation doubles the output ripple frequency and provides a significant reduction in output ripple current, minimizing the stress on the output capacitor. Inductor (input) peak and ripple currents are also reduced, allowing for the use of smaller, lower cost inductors. The greatly reduced output ripple current also minimizes the output capacitance requirement. The higher frequency output ripple is easier to filter for lower noise applications. Input and output current comparisons for single and 2-phase converters are illustrated in Figures 1 and 2. For the example illustrated in Figure 2, peak-to-peak output ripple current was reduced by 85%, from 4.34A, to 0.64A, and peak inductor current was reduced by 53%, from 4.34A to 2.02A. These reductions enable the use of low profile, smaller valued inductors and output capacitors as compared to a single-phase design. 4.4 VOUT = 1.243V • ( 1+ R1/R2) Current Limit: The current limit comparator in each phase will shut off the N-channel MOSFET switches once the current exceeds the current limit threshold, nominally 2.5A. The current limit delay to output is typically 50ns. The current signal leading edge is blanked for 50ns to enhance noise rejection. 1 PHASE CONVERTER 4.2 INPUT CURRENT (A) Soft-Start: An internal soft-start of approximately 1.5ms is provided. This is a ramp signal that limits the peak current until the internal soft-start voltage is greater than the internal current limit voltage. The internal soft-start capacitor is automatically discharged when the part is in shutdown mode. 4.3 4.1 2 PHASE CONVERTER 4.0 3.9 3.8 3.7 3.6 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 TIME (µs) 3428 F01 Figure 1. Input Ripple Current Comparison Between Single Phase and Two-Phase Boost Converters with a 2A Load and 50% Duty Cycle 3428f 6 LTC3428 U W U U APPLICATIO S I FOR ATIO Sumida CDRH4D22C/LD or CDRH5D28 series, Toko FDV0630 or D62CB series. 5.0 1 PHASE CONVERTER OUTPUT (DIODE) CURRENT (A) 4.5 4.0 Table 1. Inductor Vendor Information 3.5 Supplier Phone 3.0 2 PHASE CONVERTER 2.5 2.0 www.coilcraft.com Murata USA: USA: (814) 238-1431 (814) 238-0490 www.murata.com Sumida USA: (847) 956-6666 Japan: 81-3-3607-5111 www.sumida.com TDK (847) 803-6100 (847) 803-6296 www.component.tdk.com Toko (847) 299-0070 (847) 699-7864 www.toko.com Wurth (201)785-8800 www.we-online.com 0.5 0 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 TIME (µs) 3428 F02 Figure 2. Output Ripple Current Comparison Between Single Phase and Two Phase Boost Converters with a 2A Load and 50% Duty Cycle Website (847) 639-6400 (847) 639-1469 1.5 1.0 Fax Coilcraft USA: (847) 956-0702 Japan: 81-3-3607-5144 (201)785-8810 Output Capacitor Selection COMPONENT SELECTION Inductor Selection The high frequency operation of the LTC3428 allows for the use of small surface mount inductors. The inductor ripple current is typically set to between 20% and 40% of the maximum inductor current. For a given set of conditions, the inductance is given as follows: L≥ VIN(MIN) • (VOUT – VIN(MIN) ) , L > 2µH R • VOUT where: R = Allowable inductor current ripple (Amps P-P) VIN(MIN) = Minimum input voltage (V) VOUT = Output voltage (V) For high efficiency, the inductor should have a high frequency core material, such as ferrite, to reduce core losses. The inductor should have a low ESR (equivalent series resistance) to reduce I2R losses and must be able to handle the peak inductor current without saturating. Use of a toroid, pot core, or shielded bobbin inductor will minimize radiated noise. See Table 1 for a list of inductor manufacturers. Some example inductor part types are: Coilcraft 1608 and 3316 series, Murata LQH55D series, The minimum value of the capacitor is set to reduce the output ripple voltage due to charging and discharging the capacitor each cycle. The steady state ripple due to this charging is given by: VRIPPLE(C) = 1 IPEAK • (VOUT – VIN(MIN) ) • 2 COUT • VOUT • f where: IPEAK = Peak inductor current (A) The equivalent series resistance (ESR) of the output capacitor will contribute another term to output voltage ripple. Ripple voltage due to capacitor ESR is: VRIPPLE(ESR) = IPEAK • RESR(C) where: RESR(C) = Capacitor ESR The ESL (Equivalent Series Inductance) is another capacitor characteristic that needs to be minimized. ESL will be minimized by using small surface mount ceramic capacitors, placed as close to the VOUT pin as possible. Input Capacitor Selection Since the VIN pin directly powers most of the internal circuitry, it is recommended to place at least a 4.7µF, low ESR bypass capacitor between VIN and AGND, as close to the IC as possible. See Table 2 for a list of capacitor manufacturers. 3428f 7 LTC3428 U W U U APPLICATIO S I FOR ATIO Table 2. Capacitor Vendor Information Supplier Phone Fax Website AVX (803) 448-9411 (803) 448-1943 www.avxcorp.com Sanyo (619) 661-9322 (619) 661-1055 www.sanyovideo.com TDK (847) 803-6100 (847) 803-6296 www.component.tdk.com Murata (814) 237-1431 (814) 238-0490 www.murata.com Taiyo Yuden (408) 573-4150 (408) 573-4159 www.t-yuden.com Output Diode Selection For high efficiency, a fast switching diode with low reverse leakage and a low forward drop is required. Schottky diodes are recommended for their low forward drop and fast switching times. When selecting a diode, it is important to remember that the average diode current in a boost converter is equal to the average load current: ID = ILOAD When selecting a diode, make sure that the peak forward current and average power dissipation ratings meet the application requirements. See Table 3 for a list of Schottky diode manufacturers. Example diodes are Philips PMEG1020, PMEG2010, On-Semi MBRA210, IR 10BQ015, Microsemi UPS120E, UPS315. If the junction temperature gets too high, the LTC3428 will stop all switching until the junction temperature drops to safe levels. The typical over temperature threshold is 150°C. Closing the Feedback Loop The LTC3428 uses current mode control with internal, adaptive slope compensation. Current mode control eliminates the 2nd order pole in the loop response of voltage mode converters due to the inductor and output capacitor, simplifying it to a single pole response. The product of the modulator control to output DC gain and the error amp open-loop gain equals the DC gain of the system. G DC = G CONTROL • G EA • G CONTROL = Phone Philips +31 40 27 24825 Microsemi (949) 221-7100 On-Semi (602) 244-6600 International (310) 469-2161 Rectifier Fax Website 2 • VIN IOUT G EA ≈ 100 The output filter pole is given by: Table 3. Diode Vendor Information Supplier VREF VOUT IOUT Hz π • VOUT • C OUT fPOLE = www.philips.com (949)756-0308 www.microsemi.com www.onsemi.com (310) 322-3332 where COUT is the output filter capacitor value. The output filter zero is given by: www.irf.com Thermal Considerations To deliver maximum power, it is necessary to provide a good thermal path to dissipate the heat generated within the LTC3428’s package. The large thermal pad on the IC underside can accomplish this requirement. Use multiple PC board vias to conduct heat from the IC and to a copper plane that has as much area as possible. fZERO = 1 2 • π • RESR • C OUT Hz where RESR is the output capacitor equivalent series resistance. A complication of the boost converter topology is the right half plane (RHP) zero and is given by: 2 fRHP = VIN • RO 2 • π • L • VO 2 Hz 3428f 8 LTC3428 U W U U APPLICATIO S I FOR ATIO This zero causes a gain increase with phase lag. With heavy loads, this can occur at a relatively low frequency. For this reason, loop gain is typically rolled off below the RHP zero frequency. VOUT + – 1 2 • π • 400e 6 • C C1 1 fZERO1 ≈ 2 • π • RZ • C C1 1 fZERO2 ≈ 2 • π • RZ • (C C2 + 5pF ) R1 FB R2 A typical error amp compensation is shown in Figure 3 and in the Typical Application section. The equations for the loop dynamics are as follow: 1.243V VC 5pF RZ CC2 CC1 fPOLE1 ≈ 3428 F03 Figure 3. 3428f 9 LTC3428 U TYPICAL APPLICATIO S 2.5V to 3.3V at 2.5A Converter 2.5VIN 4.7µH* 8 4 SHUTDOWN 5 10k 22pF 7 1 1000pF 4.7µF VIN LTC3428 VOUT SHDN SWA VC SWB AGND PGNDA FB PGNDB 4.7µH* 3 VOUT 3.3V, 2.5A 2 ** 9 ** 205k 6 10 4.7µF*** 4× * TOKO DC53LC ** MICROSEMI UPS120E *** TAIYO YUDEN X5R JMK212BJ475MD 121k 3428 TA03 3428f 10 LTC3428 U PACKAGE DESCRIPTIO DD Package 10-Lead Plastic DFN (3mm × 3mm) (Reference LTC DWG # 05-08-1699) R = 0.115 TYP 6 0.38 ± 0.10 10 0.675 ±0.05 3.50 ±0.05 1.65 ±0.05 2.15 ±0.05 (2 SIDES) 3.00 ±0.10 (4 SIDES) PACKAGE OUTLINE 1.65 ± 0.10 (2 SIDES) PIN 1 TOP MARK (SEE NOTE 6) (DD10) DFN 1103 5 0.200 REF 0.25 ± 0.05 0.50 BSC 2.38 ±0.05 (2 SIDES) RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS 1 0.25 ± 0.05 0.50 BSC 0.75 ±0.05 0.00 – 0.05 2.38 ±0.10 (2 SIDES) BOTTOM VIEW—EXPOSED PAD NOTE: 1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (WEED-2). CHECK THE LTC WEBSITE DATA SHEET FOR CURRENT STATUS OF VARIATION ASSIGNMENT 2. DRAWING NOT TO SCALE 3. ALL DIMENSIONS ARE IN MILLIMETERS 4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE 5. EXPOSED PAD SHALL BE SOLDER PLATED 6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE TOP AND BOTTOM OF PACKAGE 3428f Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights. 11 LTC3428 RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LT1613 550mA (ISW), 1.4MHz, High Efficiency Step-Up DC/DC Converter 90% Efficiency, VIN: 0.9V to 10V, VOUT(MAX) = 34V, IQ = 3mA, ISD <1µA, ThinSOT Package LT1615/LT1615-1 300mA/80mA (ISW), High Efficiency Step-Up DC/DC Converters VIN: 1V to 15V, VOUT(MAX) = 34V, IQ = 20µA, ISD <1µA, ThinSOT Package LT1618 1.5A (ISW), 1.25MHz, High Efficiency Step-Up DC/DC Converter 90% Efficiency, VIN: 1.6V to 18V, VOUT(MAX) = 35V, IQ = 1.8mA, ISD <1µA, MS Package LT1930/LT1930A 1A (ISW), 1.2MHz/2.2MHz, High Efficiency Step-Up DC/DC Converters High Efficiency, VIN: 2.6V to 16V, VOUT(MAX) = 34V, IQ = 4.2mA/5.5mA, ISD <1µA, ThinSOT Package LT1946/LT1946A 1.5A (ISW), 1.2MHz/2.7MHz, High Efficiency Step-Up DC/DC Converters High Efficiency, VIN: 2.45V to 16V, VOUT(MAX) = 34V, IQ = 3.2mA, ISD <1µA, MS8 Package LT1961 1.5A (ISW), 1.25MHz, High Efficiency Step-Up DC/DC Converter 90% Efficiency, VIN: 3V to 25V, VOUT(MAX) = 35V, IQ = 0.9mA, ISD 6µA, MS8E Package LTC3400/LTC3400B 600mA (ISW), 1.2MHz, Synchronous Step-Up DC/DC Converter 92% Efficiency, VIN: 0.85V to 5V, VOUT(MAX) = 5V, IQ = 19µA/300µA, ISD <1µA, ThinSOT Package LTC3401 1A (ISW), 3MHz, Synchronous Step-Up DC/DC Converter 97% Efficiency, VIN: 0.5V to 5V, VOUT(MAX) = 5.5V, IQ = 38µA, ISD <1µA, MS Package LTC3402 2A (ISW), 3MHz, Synchronous Step-Up DC/DC Converter 97% Efficiency, VIN: 0.5V to 5V, VOUT(MAX) = 5.5V, IQ = 38µA, ISD <1µA, MS Package LTC3421 3A, 3MHz Synchronous Boost Converter with Output Disconnect 96% Efficiency, VIN: 0.5V to 4.5V, VOUT(MAX) = 5.5V, IQ = 12µA, ISD <1µA, QFN-24 Package LTC3425 5A (ISW), 8MHz, 4-Phase Synchronous Step-Up DC/DC Converter 95% Efficiency, VIN: 0.5V to 4.5V, VOUT(MAX) = 5.25V, IQ = 12µA, ISD <1µA, QFN-32 Package LTC3429 600mA, 500kHz Synchronous Boost Converter with Output Disconnect 96% Efficiency, VIN: 0.5V to 4.4V, VOUT(MAX) = 5.5V, IQ = 20µA, ISD <1µA, ThinSOT Package LTC3436 3A (ISW), 1MHz, 34V Step-Up DC/DC Converter VIN: 3V to 25V, VOUT(MAX) = 34V, IQ = 0.9mA, ISD <6µA, TSSOP-16E Package LTC3459 10V Micropower Synchronous Boost Converter 85% Efficiency, VIN: 1.5V to 5.5V, VOUT(MAX) = 10V, IQ = 10µA, ISD <1µA, ThinSOT Package LT3464 85mA (ISW), High Efficiency Step-Up DC/DC Converter with Integrated Schottky and PNP Disconnect VIN: 2.3V to 10V, VOUT(MAX) = 34V, IQ = 25µA, ISD <1µA, ThinSOT Package No RSENSE is a registered trademark of Linear Technology Corporation. 3428f 12 Linear Technology Corporation LT/TP 0804 1K • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com © LINEAR TECHNOLOGY CORPORATION 2004