Sample & Buy Product Folder Support & Community Tools & Software Technical Documents LM2852 SNVS325E – JANUARY 2005 – REVISED JANUARY 2016 LM2852 2A 500/1500 kHz Synchronous Simple Switcher® Buck Regulator 1 Features 3 Description • • The LM2852 Simple Switcher® synchronous buck regulator is a high frequency step-down switching voltage regulator capable of driving up to a 2A load with excellent line and load regulation. The LM2852 can accept an input voltage between 2.85 V and 5.5 V and deliver an output voltage that is factory programmable from 0.8 V to 3.3 V in 100-mV increments. The LM2852 is available with a choice of two switching frequencies –500 kHz (LM2852Y) or 1.5 MHz (LM2852X). It also features internal, typethree compensation to deliver a low component count solution. The exposed-pad HTSSOP-14 package enhances the thermal performance of the LM2852. 1 • • • • • • • Input Voltage Range of 2.85 to 5.5 V Factory EEPROM Set Output Voltages from 0.8 V to 3.3 V in 100-mV Increments Maximum Load Current of 2 A Voltage Mode Control Internal Type-Three Compensation Switching Frequency of 500 kHz or 1.5 MHz Low Standby Current of 10 µA Internal 60-mΩ MOSFET Switches Standard Voltage Options 0.8/1/1.2/1.5/1.8/2.5/3.3 V Device Information(1) 2 Applications • • • • PART NUMBER Low Voltage Point of Load Regulation Local Solution for FPGA/DSP/ASIC Core Power Broadband Networking and Communications Infrastructure Portable Computing space Typical Application Circuit LM2852 PACKAGE HTSSOP (14) BODY SIZE (NOM) 5.00 mm × 4.40 mm (1) For all available packages, see the orderable addendum at the end of the data sheet. Efficiency vs ILOAD VIN = 3.3V 96 PVIN CIN = 22 PF AVIN EN SS LM2852Y SNS PGND PVIN = 3.3V VOUT = 2.5V ILOAD = 0A to 2A SW SGND LO = 10 PH + 94 CO = 100 PF EFFICIENCY (%) CSS = 2.7 nF 92 90 88 86 84 0.1 1.0 10 ILOAD (A) 1 An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCTION DATA. LM2852 SNVS325E – JANUARY 2005 – REVISED JANUARY 2016 www.ti.com Table of Contents 1 2 3 4 5 6 7 Features .................................................................. Applications ........................................................... Description ............................................................. Revision History..................................................... Pin Configuration and Functions ......................... Specifications......................................................... 1 1 1 2 3 4 6.1 6.2 6.3 6.4 6.5 6.6 6.7 6.8 4 4 4 4 5 7 8 Absolute Maximum Ratings ...................................... ESD Ratings.............................................................. Recommended Operating Conditions....................... Thermal Information .................................................. Electrical Characteristics........................................... LM2852Y Typical Characteristics (500 kHz)............. LM2852X Typical Characteristics (1500 kHz)........... LM2852 Typical Characteristics (Both Y and X Versions) .................................................................... 9 Detailed Description ............................................ 10 7.1 Overview ................................................................. 10 7.2 Functional Block Diagram ....................................... 10 7.3 Feature Description................................................. 11 7.4 Device Functional Modes........................................ 11 8 Application and Implementation ........................ 12 8.1 Application Information............................................ 12 8.2 Typical Application ................................................. 12 9 Power Supply Recommendations...................... 18 10 Layout................................................................... 18 10.1 Layout Guidelines ................................................. 18 10.2 Layout Example .................................................... 18 11 Device and Documentation Support ................. 19 11.1 11.2 11.3 11.4 11.5 Device Support...................................................... Community Resources.......................................... Trademarks ........................................................... Electrostatic Discharge Caution ............................ Glossary ................................................................ 19 19 19 19 19 12 Mechanical, Packaging, and Orderable Information ........................................................... 19 4 Revision History NOTE: Page numbers for previous revisions may differ from page numbers in the current version. Changes from Revision D (April 2013) to Revision E • 2 Page Added ESD Ratings table, Feature Description section, Device Functional Modes, Application and Implementation section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and Mechanical, Packaging, and Orderable Information section .................................................................................................. 1 Submit Documentation Feedback Copyright © 2005–2016, Texas Instruments Incorporated Product Folder Links: LM2852 LM2852 www.ti.com SNVS325E – JANUARY 2005 – REVISED JANUARY 2016 5 Pin Configuration and Functions PWP Package 14-Pin HTSSOP Top View AVIN 1 14 SNS EN 2 13 NC SGND 3 12 NC SS 4 11 PGND NC 5 10 PGND PVIN 6 9 SW PVIN 7 8 SW LM2852 Pin Functions PIN NAME NO. I/O DESCRIPTION AVIN 1 I Chip bias input pin. This provides power to the logic of the chip. Connect to the input voltage or a separate rail. EN 2 I Enable. Connect this pin to ground to disable the chip; connect to AVIN or leave floating to enable the chip; enable is internally pulled up. Exposed NC Connect to ground. 5, 12, 13 No connect. These pins must be tied to ground or left floating in the application. PGND 10, 11 G Power ground. Connect this to an internal ground plane or other large ground plane. PVIN 6, 7 I Input supply pin. PVIN is connected to the input voltage. This rail connects to the source of the internal power PFET. SGND 3 G Signal ground. SNS 14 O Output voltage sense pin. Connect this pin to the output voltage as close to the load as possible. SS 4 I Soft-start pin. Connect this pin to a small capacitor to control startup. The soft-start capacitance range is restricted to values 1 nF to 50 nF. SW 8, 9 O Switch pin. Connect to the output inductor. Submit Documentation Feedback Copyright © 2005–2016, Texas Instruments Incorporated Product Folder Links: LM2852 3 LM2852 SNVS325E – JANUARY 2005 – REVISED JANUARY 2016 www.ti.com 6 Specifications 6.1 Absolute Maximum Ratings over operating free-air temperature range (unless otherwise noted) (1) (2) MIN PVIN, AVIN, EN, SNS Power dissipation V Infrared (15 sec) 220 °C Vapor phase (60 sec) 215 °C 150 °C 150 °C Maximum junction temperature −65 Storage temperature, Tstg (2) UNIT 6.5 Internally limited 14-Pin exposed pad HTSSOP package (1) MAX Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/ Distributors for availability and specifications. 6.2 ESD Ratings V(ESD) (1) Electrostatic discharge VALUE UNIT ±2000 V Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001 (1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process. 6.3 Recommended Operating Conditions over operating free-air temperature range (unless otherwise noted) MIN MAX UNIT PVIN to GND 1.5 5.5 AVIN to GND 2.85 5.5 V Junction temperature −40 125 °C V 6.4 Thermal Information LM2852 THERMAL METRIC (1) PWP (HTTSOP) UNIT 14 PINS RθJA Junction-to-ambient thermal resistance 39.2 °C/W RθJC(top) Junction-to-case (top) thermal resistance 24.1 °C/W RθJB Junction-to-board thermal resistance 20.1 °C/W ψJT Junction-to-top characterization parameter 0.6 °C/W ψJB Junction-to-board characterization parameter 19.8 °C/W RθJC(bot) Junction-to-case (bottom) thermal resistance 1.7 °C/W (1) 4 For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application report, SPRA953. Submit Documentation Feedback Copyright © 2005–2016, Texas Instruments Incorporated Product Folder Links: LM2852 LM2852 www.ti.com SNVS325E – JANUARY 2005 – REVISED JANUARY 2016 6.5 Electrical Characteristics AVIN = PVIN = 5 V unless otherwise indicated under the Test Conditions column. Limits apply over the junction temperature (TJ) range of –40°C to 125°C (unless otherwise noted). Minimum and Maximum limits are ensured through test, design, or statistical correlation. Typical values represent the most likely parametric norm at TJ = 25°C, and are provided for reference purposes only. PARAMETER TEST CONDITIONS MIN TYP MAX UNIT SYSTEM PARAMETERS VOUT = 0.8-V option VOUT = 1-V option VOUT ΔVOUT/ ΔAVIN Voltage tolerance (1) Line regulation (1) VON Load regulation 0.818 1.0225 VOUT = 1.2-V option 1.173 1.227 VOUT = 1.5-V option 1.4663 1.5337 VOUT = 1.8-V option 1.7595 1.8405 VOUT = 2.5-V option 2.4437 2.5563 VOUT = 3-V option 2.9325 3.0675 VOUT = 3.3-V option 3.2257 3.3743 VOUT = 0.8 V, 1 V, 1.2 V, 1.5 V, TJ = –40°C to 125°C 1.8 V or 2.5 V, 2.85 V ≤ AVIN ≤ 5.5 V TJ = 25°C VOUT = 3.3 V, 3.5 V ≤ AVIN ≤ 5.5 V ΔVOUT/ΔIO 0.782 0.9775 0.6% 0.2% TJ = –40°C to 125°C 0.6% TJ = 25°C 0.2% Normal operation TJ = 25°C 8 Rising TJ = –40°C to 125°C Falling hysteresis TJ = –40°C to 125°C PFET ON resistance 85 NFET ON resistance 140 120 TJ = 25°C RSS Soft-start resistance 400 LM2852X TJ = –40°C to 125°C LM2852Y TJ = 25°C IQ Operating current Non-switching RSNS (1) Shutdown quiescent current EN = 0 V Sense pin resistance TJ = 25°C 4 2.25 A 3.65 3 2 mA 0.85 TJ = –40°C to 125°C TJ = 25°C kΩ 4.95 TJ = –40°C to 125°C TJ = 25°C ISD 2.75 TJ = 25°C Peak current limit threshold ICL mΩ 55 TJ = 25°C TJ = –40°C to 125°C mΩ 75 TJ = –40°C to 125°C Isw = 2 A mV 150 TJ = 25°C rDSON-N 210 TJ = –40°C to 125°C Isw = 2 A V 2.47 TJ = 25°C rDSON-P mV/A 2.85 TJ = 25°C UVLO threshold (AVIN) V 25 µA 10 400 kΩ VOUT measured in a non-switching, closed-loop configuration at the SNS pin. Submit Documentation Feedback Copyright © 2005–2016, Texas Instruments Incorporated Product Folder Links: LM2852 5 LM2852 SNVS325E – JANUARY 2005 – REVISED JANUARY 2016 www.ti.com Electrical Characteristics (continued) AVIN = PVIN = 5 V unless otherwise indicated under the Test Conditions column. Limits apply over the junction temperature (TJ) range of –40°C to 125°C (unless otherwise noted). Minimum and Maximum limits are ensured through test, design, or statistical correlation. Typical values represent the most likely parametric norm at TJ = 25°C, and are provided for reference purposes only. PARAMETER TEST CONDITIONS MIN TYP MAX UNIT PWM LM2852X 1500-kHz option. TJ = –40°C to 125°C 1050 TJ = 25°C fosc LM2852Y 500-kHz option. TJ = –40°C to 125°C Duty cycle kHz 1500 325 TJ = 25°C Drange 1825 625 kHz 500 0% 100% ENABLE CONTROL (2) VIH EN pin minimum high input VIL EN pin maximum low input IEN EN pin pullup current % of AVIN 75 25 EN = 0 V TJ = 25°C % of AVIN 1.2 µA THERMAL CONTROLS TSD TJ for thermal shutdown TJ = 25°C 165 °C TSD-HYS Hysteresis for thermal shutdown TJ = 25°C 10 °C (2) 6 The enable pin is internally pulled up, so the LM2852 is automatically enabled unless an external enable voltage is applied. Submit Documentation Feedback Copyright © 2005–2016, Texas Instruments Incorporated Product Folder Links: LM2852 LM2852 www.ti.com SNVS325E – JANUARY 2005 – REVISED JANUARY 2016 6.6 LM2852Y Typical Characteristics (500 kHz) 92 96 PVIN = 3.3V PVIN = 3.3V 90 94 86 84 92 EFFICIENCY (%) EFFICIENCY (%) 88 PVIN = 5.0V 82 90 PVIN = 5.0V 88 80 86 78 76 0.1 1.0 84 10 0.1 1.0 Figure 2. Efficiency vs ILoad VOUT = 2.5 V Figure 1. Efficiency vs ILoad VOUT = 1.5 V 95 560 94 550 VIN = 3.3V PVIN = 5.0V 540 FREQUENCY (kHz) EFFICIENCY (%) 93 92 91 90 530 520 510 89 500 88 490 87 0.1 10 ILOAD (A) ILOAD (A) 1.0 10 VIN = 5V 480 -50 -25 0 25 50 75 100 125 150 TEMPERATURE (oC) ILOAD (A) Figure 3. Efficiency vs ILoad VOUT = 3.3 V Figure 4. Frequency vs Temperature Submit Documentation Feedback Copyright © 2005–2016, Texas Instruments Incorporated Product Folder Links: LM2852 7 LM2852 SNVS325E – JANUARY 2005 – REVISED JANUARY 2016 www.ti.com 6.7 LM2852X Typical Characteristics (1500 kHz) 100 85 PVIN = 3.3V PVIN = 3.3V 80 90 70 65 60 80 EFFICIENCY (%) EFFICIENCY (%) 75 PVIN = 5.0V PVIN = 5.0V 70 60 55 50 50 45 0.1 1.0 40 0.1 10 1.0 ILOAD (A) ILOAD (A) Figure 5. Efficiency vs ILoad VOUT = 1.5 V Figure 6. Efficiency vs ILoad VOUT = 2.5 V 90 1600 85 1550 FREQUENCY (kHz) EFFICIENCY (%) 80 75 PVIN = 5.0V 70 65 60 55 50 0.1 PVIN = 3.3V 1500 1450 PVIN = 5.0V 1400 1350 1300 1250 1.0 10 1200 -50 -25 ILOAD (A) 0 25 50 75 80 85 90 o TEMPERATURE ( C) Figure 7. Efficiency vs ILoad VOUT = 3.3 V 8 10 Submit Documentation Feedback Figure 8. Frequency vs Temperature Copyright © 2005–2016, Texas Instruments Incorporated Product Folder Links: LM2852 LM2852 www.ti.com SNVS325E – JANUARY 2005 – REVISED JANUARY 2016 6.8 LM2852 Typical Characteristics (Both Y and X Versions) 100 130 120 90 PFET RDSON (m:) NFET RDSON (m:) 110 80 PVIN = 3.3V 70 PVIN = 5.0V 60 PVIN = 3.3V 100 90 PVIN = 5.0V 80 70 50 60 40 -50 -25 0 25 50 75 50 -50 100 125 150 -25 0 25 50 75 100 125 150 TEMPERATURE (oC) TEMPERATURE (oC) Figure 9. NMOS Switch RDSON vs Temperature Figure 10. PMOS Switch RDSON vs Temperature Submit Documentation Feedback Copyright © 2005–2016, Texas Instruments Incorporated Product Folder Links: LM2852 9 LM2852 SNVS325E – JANUARY 2005 – REVISED JANUARY 2016 www.ti.com 7 Detailed Description 7.1 Overview The LM2852 is a DC-DC synchronous buck regulator belonging to Texas Instrument’s SIMPLE SWITCHER family. Integration of the PWM controller, power switches and compensation network greatly reduces the component count required to implement a switching power supply. 7.2 Functional Block Diagram SGND PVIN Reference Oscillator UVLO DAC AVIN Current Limit Ramp and Clock Generator 400 k: EN Gate Drive Error Amp SS + 20 pF 200 k: 200 k: Zc1 Zc2 SW + PWM Comp PGND SNS 10 Submit Documentation Feedback Copyright © 2005–2016, Texas Instruments Incorporated Product Folder Links: LM2852 LM2852 www.ti.com SNVS325E – JANUARY 2005 – REVISED JANUARY 2016 7.3 Feature Description 7.3.1 Split-Rail Operation The LM2852 can be powered using two separate voltages for AVIN and PVIN. AVIN is the supply for the control logic; PVIN is the supply for the power FETs. The output filter components need to be chosen based on the value of PVIN. For PVIN levels lower than 3.3 V, use output filter component values recommended for 3.3 V. PVIN must always be equal to or less than AVIN. PVIN = 3.3V AVIN = 5V PVIN AVIN EN SS CIN = 47 PF 1 PF LM2852Y SNS VOUT = 1.5V ILOAD = 0A to 2A SW SGND PGND LO = 10 PH + CO = 100 PF CSS = 3.3 nF Figure 11. Split-Rail Operation 7.3.2 Switch Node Protection The LM2852 includes protection circuitry that monitors the voltage on the switch pin. Under certain conditions, switching is disabled in order to protect the switching devices. One result of the protection circuitry may be observed when power to the LM2852 is applied with no or light load on the output. The output regulates to the rated voltage, but no switching may be observed. As soon as the output is loaded, the LM2852 begins normal switching operation. 7.4 Device Functional Modes The LM2852 Enable pin is internally pulled up so that the part is enabled anytime the input voltage exceeds the UVLO threshold. A pulldown resistor can be used to set the enable input to low. Submit Documentation Feedback Copyright © 2005–2016, Texas Instruments Incorporated Product Folder Links: LM2852 11 LM2852 SNVS325E – JANUARY 2005 – REVISED JANUARY 2016 www.ti.com 8 Application and Implementation NOTE Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers must validate and test their design implementation to confirm system functionality. 8.1 Application Information The LM2852 is a DC-DC synchronous buck regulator capable of driving a maximum load current of 2A, with an input range of 2.85 V to 5.5 V and a variable output range of 0.8 V to 3.3 V. Figure 12 is a schematic example of a typical application. 8.2 Typical Application VIN = 3.3V U1 PVIN Rf CINX AVIN EN Cf CIN SS LM2852 SNS VOUT = 1.8V ILOAD = 0A to 2A SW SGND PGND LO + CO CSS Figure 12. LM2852 Example Circuit Schematic 8.2.1 Design Requirements A typical application requires only four components: an input capacitor, a soft-start capacitor, an output filter capacitor and an output filter inductor. To properly size the components for the application, the designer needs the following parameters: input voltage range, output voltage, output current range, and required switching frequency. These four main parameters affect the choices of component available to achieve a proper system behavior. 8.2.2 Detailed Design Procedure 8.2.2.1 Input Capacitor (CIN) Fast switching of large currents in the buck converter places a heavy demand on the voltage source supplying PVIN. The input capacitor, CIN, supplies extra charge when the switcher needs to draw a burst of current from the supply. The RMS current rating and the voltage rating of the CIN capacitor are therefore important in the selection of CIN. The RMS current specification can be approximated by Equation 1: IRMS = ILOAD D(1-D) where • D is the duty cycle, VOUT/VIN. CIN also provides filtering of the supply. (1) Trace resistance and inductance degrade the benefits of the input capacitor, so CIN must be placed very close to PVIN in the layout. A 22-µF or 47-µF ceramic capacitor is typically sufficient for CIN. In parallel with the large input capacitance a smaller capacitor may be added such as a 1-µF ceramic for higher frequency filtering. 12 Submit Documentation Feedback Copyright © 2005–2016, Texas Instruments Incorporated Product Folder Links: LM2852 LM2852 www.ti.com SNVS325E – JANUARY 2005 – REVISED JANUARY 2016 Typical Application (continued) 8.2.2.2 Soft-Start Capacitor (CSS) The DAC that sets the reference voltage of the error amp sources a current through a resistor to set the reference voltage. The reference voltage is one half of the output voltage of the switcher due to the 200 kΩ divider connected to the SNS pin. Upon start-up, the output voltage of the switcher tracks the reference voltage with a two to one ratio as the DAC current charges the capacitance connected to the reference voltage node. Internal capacitance of 20 pF is permanently attached to the reference voltage node which is also connected to the soft-start pin, SS. Adding a soft-start capacitor externally increases the time it takes for the output voltage to reach its final level. The charging time required for the reference voltage can be estimated using the RC time constant of the DAC resistor and the capacitance connected to the SS pin. Three RC time constant periods are needed for the reference voltage to reach 95% of its final value. The actual start-up time varies with differences in the DAC resistance and higher-order effects. If little or no soft-start capacitance is connected, then the start-up time may be determined by the time required for the current limit current to charge the output filter capacitance. The capacitor charging equation I = C ΔV/Δt can be used to estimate the start-up time in this case. For example, a part with a 3-V output, a 100-µF output capacitance and a 3-A current limit threshold would require a time of 100 µs, seen in Equation 2: 't = C 'V 3V = 100 PF = 100 Ps I 3A (2) Since it is undesirable for the power supply to start up in current limit, a soft-start capacitor must be chosen to force the LM2852 to start up in a more controlled fashion based on the charging of the soft-start capacitance. In this example, suppose a 3 ms start time is desired. Three time constants are required for charging the soft-start capacitor to 95% of the final reference voltage. So in this case RC = 1 ms. The DAC resistor, R, is 400 kΩ so C can be calculated to be 2.5 nF. A 2.7-nF ceramic capacitor can be chosen to yield approximately a 3 ms start-up time. 8.2.2.3 Soft-Start Capacitor (CSS) and Fault Conditions Various fault conditions such as short circuit and UVLO of the LM2852 activate internal circuitry designed to control the voltage on the soft-start capacitor. For example, during a short circuit current limit event, the output voltage typically falls to a low voltage. During this time, the soft-start voltage is forced to track the output so that once the short is removed, the LM2852 can restart gracefully from whatever voltage the output reached during the short circuit event. The range of soft-start capacitors is therefore restricted to values 1 nF to 50 nF. 8.2.2.4 Compensation The LM2852 provides a highly integrated solution to power supply design. The compensation of the LM2852, which is type-three, is included on-chip. The benefit to integrated compensation is straightforward, simple power supply design. Since the output filter capacitor and inductor values impact the compensation of the control loop, the range of L, C and CESR values is restricted in order to ensure stability. Submit Documentation Feedback Copyright © 2005–2016, Texas Instruments Incorporated Product Folder Links: LM2852 13 LM2852 SNVS325E – JANUARY 2005 – REVISED JANUARY 2016 www.ti.com Typical Application (continued) 8.2.2.5 Output Filter Values Table 1 details the recommended inductor and capacitor ranges for the LM2852 that are suggested for various typical output voltages. Values slightly different than those recommended may be used, however the phase margin of the power supply may be degraded. Table 1. Output Filter Values FREQUENCY OPTION LM2852Y (500 kHz) LM2852X (1500 kHz) 14 VOUT (V) PVIN (V) 0.8 L (µH) C (µF) CESR (mΩ) MIN MAX MIN MAX MIN MAX 3.3 10 15 100 220 70 200 0.8 5 10 15 100 120 70 200 1 3.3 10 15 100 180 70 200 1 5 10 15 100 180 70 200 1.2 3.3 10 15 100 180 70 200 1.2 5 15 22 100 120 70 200 1.5 3.3 10 15 100 120 70 200 1.5 5 22 22 100 120 70 200 1.8 3.3 10 15 100 120 100 200 1.8 5 22 33 100 120 100 200 2.5 3.3 6.8 10 68 120 95 275 2.5 5 15 22 68 120 95 275 3.3 5 15 22 68 100 100 275 0.8 3.3 0.8 5 1 3.3 1 5 1.2 3.3 1.2 5 1.5 3.3 1.5 5 1.8 3.3 1.8 5 2.5 3.3 2.5 5 3.3 5 1 Submit Documentation Feedback 10 The 1500-kHz version is designed for ceramic output capacitors, which typically have very low ESR (< 10 mΩ.) Copyright © 2005–2016, Texas Instruments Incorporated Product Folder Links: LM2852 LM2852 www.ti.com SNVS325E – JANUARY 2005 – REVISED JANUARY 2016 8.2.2.6 Choosing an Inductance Value The current ripple present in the output filter inductor is determined by the input voltage, output voltage, switching frequency and inductance according to Equation 3: 'IL = D x (VIN - VOUT) fxL where • • • • • • ΔIL is the peak-to-peak current ripple. D is the duty cycle VOUT/VIN. VIN is the input voltage applied to the PVIN pin. VOUT is the output voltage of the switcher. f is the switching frequency. L is the inductance of the output filter inductor. (3) Knowing the current ripple is important for inductor selection since the peak current through the inductor is the load current plus one half the ripple current. Care must be taken to ensure the peak inductor current does not reach a level high enough to trip the current limit circuitry of the LM2852. As an example, consider a 5-V to 1.2-V conversion and a 500-kHz switching frequency. According to Table 1, a 15-µH inductor may be used. Calculating the expected peak-to-peak ripple, as seen in Equation 4. 'IL = 1.2V x (5V - 1.2V) 5V 500 kHz x 15 PH = 121.6 mA (4) The maximum inductor current for a 2-A load would therefore be 2 A plus 60.8 mA, 2.0608 A. As shown in the ripple equation, the current ripple is inversely proportional to inductance. 8.2.2.7 Output Filter Inductors Once the inductance value is chosen, the key parameter for selecting the output filter inductor is its saturation current (Isat) specification. Typically Isat is given by the manufacturer as the current at which the inductance of the coil falls to a certain percentage of the nominal inductance. The Isat of an inductor used in an application must be greater than the maximum expected inductor current to avoid saturation. Table 2 lists the inductors that may be suitable in LM2852 applications. Table 2. LM2852 Output Filter Inductors INDUCTANCE (µH) PART NUMBER VENDOR 1 DO1608C-102 Coilcraft 1 DO1813P-102HC Coilcraft 6.8 DO3316P-682 Coilcraft 7 MSS1038-702NBC Coilcraft 10 DO3316P-103 Coilcraft 10 MSS1038-103NBC Coilcraft 12 MSS1038-123NBC Coilcraft 15 D03316P-153 Coilcraft 15 MSS1038-153NBC Coilcraft 18 MSS1038-183NBC Coilcraft 22 DO3316P-223 Coilcraft 22 MSS1038-223NBC Coilcraft 22 DO3340P-223 Coilcraft 27 MSS1038-273NBC Coilcraft 33 MSS1038-333NBC Coilcraft 33 DO3340P-333 Coilcraft Submit Documentation Feedback Copyright © 2005–2016, Texas Instruments Incorporated Product Folder Links: LM2852 15 LM2852 SNVS325E – JANUARY 2005 – REVISED JANUARY 2016 www.ti.com 8.2.2.8 Output Filter Capacitors The capacitors that may be used in the output filter with the LM2852 are limited in value and ESR range according to Table 1. Table 3 lists some examples of capacitors that can typically be used in an LM2852 application. Table 3. LM2852 Output Filter Capacitors CAPACITANCE (µF) PART NUMBER CHEMISTRY VENDOR 10 GRM31MR61A106KE19 Ceramic Murata 10 GRM32DR61E106K Ceramic Murata 68 595D686X_010C2T Tantalum Vishay - Sprague 68 595D686X_016D2T Tantalum Vishay - Sprague 100 595D107X_6R3C2T Tantalum Vishay - Sprague 100 595D107X_016D2T Tantalum Vishay - Sprague 100 NOSC107M004R0150 Niobium Oxide AVX 100 NOSD107M006R0100 Niobium Oxide AVX 120 595D127X_004C2T Tantalum Vishay - Sprague 120 595D127X_010D2T Tantalum Vishay - Sprague 150 595D157X_004C2T Tantalum Vishay - Sprague 150 595D157X_016D2T Tantalum Vishay - Sprague 150 NOSC157M004R0150 Niobium Oxide AVX 150 NOSD157M006R0100 Niobium Oxide AVX 220 595D227X_004D2T Tantalum Vishay - Sprague 220 NOSD227M004R0100 Niobium Oxide AVX 220 NOSE227M006R0100 Niobium Oxide AVX Table 4. Bill of Materials for 500kHz (LM2852Y) 3.3 VIN to 1.8 VOUT Conversion ID PART NUMBER TYPE SIZE HTSSOP-14 U1 LM2852YMXA-1.8 2-A buck LO DO3316P-153 Inductor CO* 595D107X_6R3C2T Capacitor PARAMETERS QTY VENDOR 1 TI 15 µH 1 Coilcraft Case Code “C” 100 µF ±20% 1 Vishay-Sprague Murata CIN GRM32ER60J476ME20B Capacitor 1210 47 µF/X5R/6.3V 1 CINX GRM21BR71C105KA01B Capacitor 0805 1 µF/X7R/16V 1 Murata CSS VJ0805Y272KXXA Capacitor 0805 2.7 nF ±10% 1 Vishay-Vitramon Rf CRCW060310R0F Resistor 0603 10 Ω ±10% 1 Vishay-Dale Cf GRM21BR71C105KA01B Capacitor 0805 1 µF/X7R/16V 1 Murata Table 5. Bill of Materials for 1500-kHz (LM2852X) 3.3-V to 1.8-V Conversion ID 16 PART NUMBER U1 LM2852XMXA-1.8 TYPE SIZE 2-A buck HTSSOP-14 Inductor PARAMETERS QTY VENDOR 1 TI L0 DO1813P-102HC 1 µH 1 Coilcraft C0 GRM32DR61E106K Capacitor 1210 10 µF/X5R/25V 1 Murata CIN GRM32ER60J476ME20B Capacitor 1210 47 µF/X5R/6.3V 1 Murata CINX GRM21BR71C105KA01B Capacitor 0805 1 µF/X7R/16V 1 Murata CSS VJ0805Y272KXXA Capacitor 0805 2.7 nF ±10% 1 Vishay-Vitramon Rf CRCW060310R0F Resistor 0603 10 Ω ±10% 1 Vishay-Dale Cf GRM21BR71C105KA01B Capacitor 0805 1 µF/X7R/16V 1 Murata Submit Documentation Feedback Copyright © 2005–2016, Texas Instruments Incorporated Product Folder Links: LM2852 LM2852 www.ti.com SNVS325E – JANUARY 2005 – REVISED JANUARY 2016 8.2.3 Application Curves 1100 17 1000 15 125oC 900 13 o 85 C IQ (PA) IQ SHUTDOWN (PA) 125oC 11 o 800 85oC 25 C 25oC 700 9 -40oC 7 5 2.5 3 3.5 4 4.5 -40oC 600 5 5.5 500 2.5 3 3.5 4 4.5 5 5.5 VIN (V) VIN (V) Figure 13. Shutdown Current vs VIN Figure 14. Quiescent Current (Non-Switching) vs VIN Submit Documentation Feedback Copyright © 2005–2016, Texas Instruments Incorporated Product Folder Links: LM2852 17 LM2852 SNVS325E – JANUARY 2005 – REVISED JANUARY 2016 www.ti.com 9 Power Supply Recommendations The LM2852 is designed to operate from various DC power supplies. If so, VIN input must be protected from reversal voltage and voltage dump over 6.5 V. The impedance of the input supply rail must be low enough that the input current transient does not cause drop below VIN UVLO level. If the input supply is connected by using long wires, additional bulk capacitance may be required in addition to normal input capacitor. 10 Layout 10.1 Layout Guidelines These are several guidelines to follow while designing the PCB layout for an LM2852 application. • The input bulk capacitor, CIN, must be placed very close to the PVIN pin to keep the resistance as low as possible between the capacitor and the pin. High-current levels are present in this connection • All ground connections must be tied together. Use a broad ground plane, for example a completely filled back plane, to establish the lowest resistance possible between all ground connections • The sense pin connection must be made as close to the load as possible so that the voltage at the load is the expected regulated value. The sense line must not run too close to nodes with high EMI (such as the switch node) to minimize interference • The switch node connections must be low resistance to reduce power losses. Low resistance means the trace between the switch pin and the inductor must be wide. However, the area of the switch node must not be too large since EMI increases with greater area. So connect the inductor to the switch pin with a short, but wide trace. Other high current connections in the application such as PVIN and VOUT assume the same trade off between low resistance and EMI • Allow area under the chip to solder the entire exposed die attach pad to ground for improved thermal and electrical performance 10.2 Layout Example Figure 15. PCB Layout Example 18 Submit Documentation Feedback Copyright © 2005–2016, Texas Instruments Incorporated Product Folder Links: LM2852 LM2852 www.ti.com SNVS325E – JANUARY 2005 – REVISED JANUARY 2016 11 Device and Documentation Support 11.1 Device Support 11.1.1 Third-Party Products Disclaimer TI'S PUBLICATION OF INFORMATION REGARDING THIRD-PARTY PRODUCTS OR SERVICES DOES NOT CONSTITUTE AN ENDORSEMENT REGARDING THE SUITABILITY OF SUCH PRODUCTS OR SERVICES OR A WARRANTY, REPRESENTATION OR ENDORSEMENT OF SUCH PRODUCTS OR SERVICES, EITHER ALONE OR IN COMBINATION WITH ANY TI PRODUCT OR SERVICE. 11.2 Community Resources The following links connect to TI community resources. Linked contents are provided "AS IS" by the respective contributors. They do not constitute TI specifications and do not necessarily reflect TI's views; see TI's Terms of Use. TI E2E™ Online Community TI's Engineer-to-Engineer (E2E) Community. Created to foster collaboration among engineers. At e2e.ti.com, you can ask questions, share knowledge, explore ideas and help solve problems with fellow engineers. Design Support TI's Design Support Quickly find helpful E2E forums along with design support tools and contact information for technical support. 11.3 Trademarks E2E is a trademark of Texas Instruments. Simple Switcher is a registered trademark of Texas Instruments. All other trademarks are the property of their respective owners. 11.4 Electrostatic Discharge Caution These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. 11.5 Glossary SLYZ022 — TI Glossary. This glossary lists and explains terms, acronyms, and definitions. 12 Mechanical, Packaging, and Orderable Information The following pages include mechanical, packaging, and orderable information. This information is the most current data available for the designated devices. This data is subject to change without notice and revision of this document. For browser-based versions of this data sheet, refer to the left-hand navigation. Submit Documentation Feedback Copyright © 2005–2016, Texas Instruments Incorporated Product Folder Links: LM2852 19 PACKAGE OPTION ADDENDUM www.ti.com 3-Nov-2015 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Pins Package Drawing Qty Eco Plan Lead/Ball Finish MSL Peak Temp (2) (6) (3) Op Temp (°C) Device Marking (4/5) LM2852XMXA-0.8/NOPB ACTIVE HTSSOP PWP 14 94 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 2852X 0.8 LM2852XMXA-1.0/NOPB ACTIVE HTSSOP PWP 14 94 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 2852X 1.0 LM2852XMXA-1.2 NRND HTSSOP PWP 14 TBD Call TI Call TI -40 to 125 2852X 1.2 LM2852XMXA-1.2/NOPB ACTIVE HTSSOP PWP 14 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 2852X 1.2 LM2852XMXA-1.5 NRND HTSSOP PWP 14 TBD Call TI Call TI -40 to 125 2852X 1.5 LM2852XMXA-1.5/NOPB ACTIVE HTSSOP PWP 14 94 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 2852X 1.5 LM2852XMXA-1.8/NOPB ACTIVE HTSSOP PWP 14 94 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 2852X 1.8 LM2852XMXA-2.5 NRND HTSSOP PWP 14 TBD Call TI Call TI -40 to 125 2852X 2.5 LM2852XMXA-2.5/NOPB ACTIVE HTSSOP PWP 14 94 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 2852X 2.5 LM2852XMXA-3.0/NOPB ACTIVE HTSSOP PWP 14 94 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM LM2852XMXA-3.3/NOPB ACTIVE HTSSOP PWP 14 94 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 2852X 3.3 LM2852XMXAX-1.2/NOPB ACTIVE HTSSOP PWP 14 2500 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 2852X 1.2 LM2852XMXAX-1.5/NOPB ACTIVE HTSSOP PWP 14 2500 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 2852X 1.5 LM2852XMXAX-1.8/NOPB ACTIVE HTSSOP PWP 14 2500 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 2852X 1.8 LM2852XMXAX-2.5/NOPB ACTIVE HTSSOP PWP 14 2500 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 2852X 2.5 LM2852XMXAX-3.3/NOPB ACTIVE HTSSOP PWP 14 2500 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 2852X 3.3 LM2852YMXA-1.0/NOPB ACTIVE HTSSOP PWP 14 94 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 2852Y -1.0 94 Addendum-Page 1 2852X 3.0 Samples PACKAGE OPTION ADDENDUM www.ti.com Orderable Device 3-Nov-2015 Status (1) Package Type Package Pins Package Drawing Qty Eco Plan Lead/Ball Finish MSL Peak Temp (2) (6) (3) Op Temp (°C) Device Marking (4/5) LM2852YMXA-1.2/NOPB ACTIVE HTSSOP PWP 14 94 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM LM2852YMXA-1.3/NOPB ACTIVE HTSSOP PWP 14 94 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM LM2852YMXA-1.5/NOPB ACTIVE HTSSOP PWP 14 94 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 2852Y -1.5 LM2852YMXA-1.8/NOPB ACTIVE HTSSOP PWP 14 94 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 2852Y -1.8 LM2852YMXA-2.5/NOPB ACTIVE HTSSOP PWP 14 94 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 2852Y -2.5 LM2852YMXA-3.3 NRND HTSSOP PWP 14 94 TBD Call TI Call TI -40 to 125 2852Y -3.3 LM2852YMXA-3.3/NOPB ACTIVE HTSSOP PWP 14 94 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 2852Y -3.3 LM2852YMXAX-1.0/NOPB ACTIVE HTSSOP PWP 14 2500 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 2852Y -1.0 LM2852YMXAX-1.2/NOPB ACTIVE HTSSOP PWP 14 2500 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 2852Y -1.2 LM2852YMXAX-1.3/NOPB ACTIVE HTSSOP PWP 14 2500 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM LM2852YMXAX-1.5/NOPB ACTIVE HTSSOP PWP 14 2500 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 2852Y -1.5 LM2852YMXAX-1.8/NOPB ACTIVE HTSSOP PWP 14 2500 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 2852Y -1.8 LM2852YMXAX-2.5/NOPB ACTIVE HTSSOP PWP 14 2500 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 2852Y -2.5 LM2852YMXAX-3.0/NOPB ACTIVE HTSSOP PWP 14 2500 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM LM2852YMXAX-3.3/NOPB ACTIVE HTSSOP PWP 14 2500 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. Addendum-Page 2 -40 to 125 2852Y -1.2 2852Y 1.3 2852Y 1.3 2852Y 3.0 -40 to 125 2852Y -3.3 Samples PACKAGE OPTION ADDENDUM www.ti.com 3-Nov-2015 (2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability information and additional product content details. TBD: The Pb-Free/Green conversion plan has not been defined. Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes. Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above. Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material) (3) MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature. (4) There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device. (5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation of the previous line and the two combined represent the entire Device Marking for that device. (6) Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead/Ball Finish values may wrap to two lines if the finish value exceeds the maximum column width. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release. In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis. Addendum-Page 3 PACKAGE MATERIALS INFORMATION www.ti.com 6-Nov-2015 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant LM2852XMXAX-1.2/NOP HTSSOP B PWP 14 2500 330.0 12.4 6.95 5.6 1.6 8.0 12.0 Q1 LM2852XMXAX-1.5/NOP HTSSOP B PWP 14 2500 330.0 12.4 6.95 5.6 1.6 8.0 12.0 Q1 LM2852XMXAX-1.8/NOP HTSSOP B PWP 14 2500 330.0 12.4 6.95 5.6 1.6 8.0 12.0 Q1 LM2852XMXAX-2.5/NOP HTSSOP B PWP 14 2500 330.0 12.4 6.95 5.6 1.6 8.0 12.0 Q1 LM2852XMXAX-3.3/NOP HTSSOP B PWP 14 2500 330.0 12.4 6.95 5.6 1.6 8.0 12.0 Q1 LM2852YMXAX-1.0/NOP HTSSOP B PWP 14 2500 330.0 12.4 6.95 5.6 1.6 8.0 12.0 Q1 LM2852YMXAX-1.2/NOP HTSSOP B PWP 14 2500 330.0 12.4 6.95 5.6 1.6 8.0 12.0 Q1 LM2852YMXAX-1.3/NOP HTSSOP B PWP 14 2500 330.0 12.4 6.95 5.6 1.6 8.0 12.0 Q1 LM2852YMXAX-1.5/NOP HTSSOP B PWP 14 2500 330.0 12.4 6.95 5.6 1.6 8.0 12.0 Q1 LM2852YMXAX-1.8/NOP HTSSOP B PWP 14 2500 330.0 12.4 6.95 5.6 1.6 8.0 12.0 Q1 LM2852YMXAX-2.5/NOP HTSSOP PWP 14 2500 330.0 12.4 6.95 5.6 1.6 8.0 12.0 Q1 Pack Materials-Page 1 PACKAGE MATERIALS INFORMATION www.ti.com 6-Nov-2015 Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant B LM2852YMXAX-3.0/NOP HTSSOP B PWP 14 2500 330.0 12.4 6.95 5.6 1.6 8.0 12.0 Q1 LM2852YMXAX-3.3/NOP HTSSOP B PWP 14 2500 330.0 12.4 6.95 5.6 1.6 8.0 12.0 Q1 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LM2852XMXAX-1.2/NOPB HTSSOP PWP 14 2500 367.0 367.0 35.0 LM2852XMXAX-1.5/NOPB HTSSOP PWP 14 2500 367.0 367.0 35.0 LM2852XMXAX-1.8/NOPB HTSSOP PWP 14 2500 367.0 367.0 35.0 LM2852XMXAX-2.5/NOPB HTSSOP PWP 14 2500 367.0 367.0 35.0 LM2852XMXAX-3.3/NOPB HTSSOP PWP 14 2500 367.0 367.0 35.0 LM2852YMXAX-1.0/NOPB HTSSOP PWP 14 2500 367.0 367.0 35.0 LM2852YMXAX-1.2/NOPB HTSSOP PWP 14 2500 367.0 367.0 35.0 LM2852YMXAX-1.3/NOPB HTSSOP PWP 14 2500 367.0 367.0 35.0 LM2852YMXAX-1.5/NOPB HTSSOP PWP 14 2500 367.0 367.0 35.0 LM2852YMXAX-1.8/NOPB HTSSOP PWP 14 2500 367.0 367.0 35.0 LM2852YMXAX-2.5/NOPB HTSSOP PWP 14 2500 367.0 367.0 35.0 LM2852YMXAX-3.0/NOPB HTSSOP PWP 14 2500 367.0 367.0 35.0 Pack Materials-Page 2 PACKAGE MATERIALS INFORMATION www.ti.com 6-Nov-2015 Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LM2852YMXAX-3.3/NOPB HTSSOP PWP 14 2500 367.0 367.0 35.0 Pack Materials-Page 3 MECHANICAL DATA PWP0014A MXA14A (Rev A) www.ti.com IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. 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