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LM46002

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3.5V to 60V, 2A Synchronous Step-Down Voltage Converter

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Data sheet

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LMR36520 ACTIVE SIMPLE SWITCHER® 4.2-V to 65-V, 2-A synchronous step-down converter with 26-uA IQ Higher input voltage rating, easy to use SO-8 package and an FPWM option.

LM46002

ACTIVE
Data sheet Order now

Product details

Vin (min) (V) 3.5 Vin (max) (V) 60 Vout (min) (V) 1 Vout (max) (V) 28 Iout (max) (A) 2 Iq (typ) (mA) 0.027 Switching frequency (min) (kHz) 200 Switching frequency (max) (kHz) 2200 Features Enable, Frequency synchronization, Light Load Efficiency, Over Current Protection, Power good, Pre-Bias Start-Up, Synchronous Rectification, Tracking Operating temperature range (°C) -40 to 125 Rating Catalog Regulated outputs (#) 1 Control mode current mode Duty cycle (max) (%) 99 Type Converter
Vin (min) (V) 3.5 Vin (max) (V) 60 Vout (min) (V) 1 Vout (max) (V) 28 Iout (max) (A) 2 Iq (typ) (mA) 0.027 Switching frequency (min) (kHz) 200 Switching frequency (max) (kHz) 2200 Features Enable, Frequency synchronization, Light Load Efficiency, Over Current Protection, Power good, Pre-Bias Start-Up, Synchronous Rectification, Tracking Operating temperature range (°C) -40 to 125 Rating Catalog Regulated outputs (#) 1 Control mode current mode Duty cycle (max) (%) 99 Type Converter
HTSSOP (PWP) 16 32 mm² 5 x 6.4
  • 27-µA Quiescent current in regulation
  • High efficiency at light load (DCM and PFM)
  • Meets EN55022/CISPR 22 EMI standards
  • Integrated synchronous rectification
  • Adjustable frequency range: 200 kHz to 2.2 MHz (500 kHz default)
  • Frequency synchronization to external clock
  • Internal compensation
  • Stable with almost any combination of ceramic, polymer, tantalum, and aluminum capacitors
  • Power-good flag
  • Soft start into prebiased load
  • Internal soft start: 4.1 ms
  • Extendable soft-start time by external capacitor
  • Output voltage tracking capability
  • Precision enable to program system UVLO
  • Output short-circuit protection with hiccup mode
  • Overtemperature thermal shutdown protection
  • Create a custom design using the LM46002 with the WEBENCH® Power Designer
  • 27-µA Quiescent current in regulation
  • High efficiency at light load (DCM and PFM)
  • Meets EN55022/CISPR 22 EMI standards
  • Integrated synchronous rectification
  • Adjustable frequency range: 200 kHz to 2.2 MHz (500 kHz default)
  • Frequency synchronization to external clock
  • Internal compensation
  • Stable with almost any combination of ceramic, polymer, tantalum, and aluminum capacitors
  • Power-good flag
  • Soft start into prebiased load
  • Internal soft start: 4.1 ms
  • Extendable soft-start time by external capacitor
  • Output voltage tracking capability
  • Precision enable to program system UVLO
  • Output short-circuit protection with hiccup mode
  • Overtemperature thermal shutdown protection
  • Create a custom design using the LM46002 with the WEBENCH® Power Designer

The LM46002 regulator is an easy-to-use synchronous step-down DC/DC converter capable of driving up to 2 A of load current from an input voltage ranging from 3.5 V to 60 V. The LM46002 provides exceptional efficiency, output accuracy and drop-out voltage in a very small solution size. An extended family is available in various load current options and 36-V maximum input voltage in pin-to-pin compatible packages, including LM46001, LM46000, LM43603, LM43602, LM43601 and LM43600. Peak-current-mode control is employed to achieve simple control-loop compensation and cycle-by-cycle current limiting. Optional features such as programmable switching frequency, synchronization, power-good flag, precision enable, internal soft start, extendable soft start, and tracking provide a flexible and easy-to-use platform for a wide range of applications. Discontinuous conduction and automatic frequency reduction at light loads improve light load efficiency. The family requires few external components. Pin arrangement allows simple, optimum PCB layout. Protection features include thermal shutdown, VCC undervoltage lockout, cycle-by-cycle current limit, and output short-circuit protection. The LM46002 device is available in the 16-lead HTSSOP / PWP package (6.6 mm × 5.1 mm × 1.2 mm) with 0.65-mm lead pitch.

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The LM46002 regulator is an easy-to-use synchronous step-down DC/DC converter capable of driving up to 2 A of load current from an input voltage ranging from 3.5 V to 60 V. The LM46002 provides exceptional efficiency, output accuracy and drop-out voltage in a very small solution size. An extended family is available in various load current options and 36-V maximum input voltage in pin-to-pin compatible packages, including LM46001, LM46000, LM43603, LM43602, LM43601 and LM43600. Peak-current-mode control is employed to achieve simple control-loop compensation and cycle-by-cycle current limiting. Optional features such as programmable switching frequency, synchronization, power-good flag, precision enable, internal soft start, extendable soft start, and tracking provide a flexible and easy-to-use platform for a wide range of applications. Discontinuous conduction and automatic frequency reduction at light loads improve light load efficiency. The family requires few external components. Pin arrangement allows simple, optimum PCB layout. Protection features include thermal shutdown, VCC undervoltage lockout, cycle-by-cycle current limit, and output short-circuit protection. The LM46002 device is available in the 16-lead HTSSOP / PWP package (6.6 mm × 5.1 mm × 1.2 mm) with 0.65-mm lead pitch.

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Technical documentation

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Type Title Date
* Data sheet LM46002 3.5-V to 60-V, 2-A Synchronous Step-Down Voltage Converter datasheet (Rev. C) PDF | HTML 05 Apr 2019
Application note Step-Dwn (Buck) Convrtr Pwer Solutions for Programmable Logic Controller Systems (Rev. A) PDF | HTML 26 Jul 2021
Selection guide Buck Converter Quick Reference Guide (Rev. B) 08 Apr 2021
Technical article Minimize the impact of the MLCC shortage on your power application 29 Mar 2019
Application note Understanding Inverting Buck-Boost Power Stages in Switch Mode Power Supplies (Rev. B) 12 Mar 2019
Application note Differences Between LM4600x/LM4360x A and Non-A OPNs 27 Mar 2018
White paper Synchronous Rectification in High-Performance Power Converter Design (Rev. A) 15 Sep 2016
Application note Semiconductor and IC Package Thermal Metrics (Rev. C) PDF | HTML 19 Apr 2016
More literature SIMPLE SWITCHER Synchronous Regulator Series (Rev. B) 08 Feb 2016
Technical article Inverting made simple by unleashing the buck 19 May 2015
Application note Inverting Applications Made SIMPLE With LM4600x and LM4360x (Rev. B) 20 Feb 2015
Technical article The MOSFET always rings twice – designing with synchronous converters 18 Oct 2014
Technical article Uncover the Bonus Components in Your Buck Converter Schematic 11 Oct 2014
Application note Thermal Design Made Simple With LM43603 and LM46002 15 Sep 2014
Application note Low EMI Layout Made SIMPLE With LM43600/1/2/3 and LM46000/1/2 (Rev. A) 12 Sep 2014
Application note Compensation Made SIMPLE With LM4360x, LM4600x 29 Jul 2014
EVM User's guide LM46002 EVM User Guide 08 Aug 2013
Application note AN-1533 Overvoltage Protection Circuit for Automotive Load Dump (Rev. B) 06 May 2013
Application note AN-1997 Error Amplifier Limitations in High-Performance Regulator Applications (Rev. A) 06 May 2013
Application note AN-2162 Simple Success With Conducted EMI From DC-DC Converters (Rev. C) 24 Apr 2013
Application note AN-1149 Layout Guidelines for Switching Power Supplies (Rev. C) 23 Apr 2013
Application note AN-1197 Selecting Inductors for Buck Converters (Rev. B) 23 Apr 2013
Application note AN-1229 SIMPLE SWITCHER PCB Layout Guidelines (Rev. C) 23 Apr 2013
Application note AN-1246 Stresses in Wide Input DC-DC Converters (Rev. C) 23 Apr 2013
Application note AN-1520 A Guide to Board Layout for Best Thermal Resistance for Exposed Packages (Rev. B) 23 Apr 2013
Application note AN-1566 Techniques for Thermal Analysis of Switching Power Supply Designs (Rev. A) 23 Apr 2013
Application note AN-1889 How to Measure the Loop Transfer Function of Power Supplies (Rev. A) 23 Apr 2013
Application note AN-2155 Layout Tips for EMI Reduction in DC/ DC Converters (Rev. A) 23 Apr 2013
Application note Understanding and Applying Current-Mode Control Theory 19 Aug 2007
Application note Input and Output Capacitor Selection 19 Sep 2005
More literature SEM1600 Topic 4: Constructing Your Power Supply – Layout Considerations 12 Jul 2005
Application note AN-643 EMI/RFI Board Design (Rev. B) 03 May 2004

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

LM46002PWPEVM — LM46002PWP Synchronous Step-Down Converter Evaluation Module

The Texas Instruments LM46002PWPEVM evaluation module (EVM) is a fully assembled and tested circuit for evaluating the LM46002PWP, A 60V Synchronous Step-Down Converter. The EVM operates from a 3.5V to 60V input and provides a 5V output at 2A.

User guide: PDF
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Simulation model

LM46002 PSpice Average Model

SNVM576.ZIP (88 KB) - PSpice Model
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Simulation model

LM46002 PSpice Inverting Buck Boost and Non Inverting Buck Transient Model (Rev. C)

SNVM583C.ZIP (473 KB) - PSpice Model
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Simulation model

LM46002 TINA-TI Transient Reference Design

SNVM606.TSC (87 KB) - TINA-TI Reference Design
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Simulation model

LM46002 TINA-TI Transient Spice Model

SNVM610.ZIP (52 KB) - TINA-TI Spice Model
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Simulation model

LM46002 Unencrypted Inverting and Non-inverting PSpice Transient Model (Rev. B)

SNVM729B.ZIP (7 KB) - PSpice Model
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Simulation model

LM46002 Unencrypted PSpice Average Model

SNVM730.ZIP (1 KB) - PSpice Model
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Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
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