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LM46001

ACTIVE

3.5 to 60V, 1A Synchronous Step-Down Voltage Converter

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Data sheet

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LMR36510 ACTIVE SIMPLE SWITCHER® 4.2-V to 65-V, 1-A synchronous step-down converter with 26-uA IQ Higher input voltage rating, easy to use SO-8 package and an FPWM option.
TPSM33615 ACTIVE 3-V to 36-V input, 1 to 15-V output, 1.5-A synchronous buck power module Smaller design with an integrated-inductor power module.

LM46001

ACTIVE
Data sheet Order now

Product details

Rating Catalog Topology Buck Iout (max) (A) 1 Vin (max) (V) 60 Vin (min) (V) 3.5 Vout (max) (V) 28 Vout (min) (V) 1 Features Enable, Frequency synchronization, Light Load Efficiency, Over Current Protection, Power good, Pre-Bias Start-Up, Synchronous Rectification, Tracking, UVLO adjustable Control mode current mode Operating temperature range (°C) -40 to 125 Iq (typ) (A) 0.000024 Duty cycle (max) (%) 99
Rating Catalog Topology Buck Iout (max) (A) 1 Vin (max) (V) 60 Vin (min) (V) 3.5 Vout (max) (V) 28 Vout (min) (V) 1 Features Enable, Frequency synchronization, Light Load Efficiency, Over Current Protection, Power good, Pre-Bias Start-Up, Synchronous Rectification, Tracking, UVLO adjustable Control mode current mode Operating temperature range (°C) -40 to 125 Iq (typ) (A) 0.000024 Duty cycle (max) (%) 99
HTSSOP (PWP) 16 32 mm² (5 mm × 6.4 mm)
  • 24-µA Quiescent Current in Regulation
  • High Efficiency at Light Load (DCM and PFM)
  • Meets EN55022/CISPR 22 EMI standards
  • Integrated Synchronous Rectification
  • Adjustable Switching Frequency: 200 kHz to 2.2 MHz (500 kHz default)
  • Frequency Synchronization to External Clock
  • Internal Compensation
  • Stable With Many Combinations of Ceramic, Polymer, Tantalum, and Aluminum Capacitors
  • Power-Good Flag
  • Soft Start into Pre-Biased 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 LM46001 With the WEBENCH® Power Designer
  • 24-µA Quiescent Current in Regulation
  • High Efficiency at Light Load (DCM and PFM)
  • Meets EN55022/CISPR 22 EMI standards
  • Integrated Synchronous Rectification
  • Adjustable Switching Frequency: 200 kHz to 2.2 MHz (500 kHz default)
  • Frequency Synchronization to External Clock
  • Internal Compensation
  • Stable With Many Combinations of Ceramic, Polymer, Tantalum, and Aluminum Capacitors
  • Power-Good Flag
  • Soft Start into Pre-Biased 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 LM46001 With the WEBENCH® Power Designer

The LM46001 regulator is an easy-to-use synchronous step-down DC-DC converter capable of driving up to 1 A of load current from an input voltage ranging from 3.5 V to 60 V. The LM46001 provides exceptional efficiency, output accuracy, and dropout voltage in a very small solution size. An extended family is available in 0.5-A and 2-A load current options in pin-to-pin compatible packages. 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 and 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 LM46001 device is available in the 16-lead HTSSOP package (PWP, 6.6 mm × 5.1 mm × 1.2 mm) with 0.65-mm lead pitch. The device is pin-to-pin compatible with LM46000, LM46002, LM43603, LM43602, LM43601, and LM43600.

The LM46001 regulator is an easy-to-use synchronous step-down DC-DC converter capable of driving up to 1 A of load current from an input voltage ranging from 3.5 V to 60 V. The LM46001 provides exceptional efficiency, output accuracy, and dropout voltage in a very small solution size. An extended family is available in 0.5-A and 2-A load current options in pin-to-pin compatible packages. 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 and 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 LM46001 device is available in the 16-lead HTSSOP package (PWP, 6.6 mm × 5.1 mm × 1.2 mm) with 0.65-mm lead pitch. The device is pin-to-pin compatible with LM46000, LM46002, LM43603, LM43602, LM43601, and LM43600.

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Technical documentation

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* Data sheet LM46001 3.5-V to 60-V, 1-A Synchronous Step-Down Voltage Converter datasheet (Rev. B) PDF | HTML Jan 11, 2018
Application note Semiconductor and IC Package Thermal Metrics (Rev. D) PDF | HTML Mar 25, 2024
Application note Step-Dwn (Buck) Convrtr Pwer Solutions for Programmable Logic Controller Systems (Rev. A) PDF | HTML Jul 26, 2021
Selection guide Buck Converter Quick Reference Guide (Rev. B) Apr 8, 2021
Application note Understanding Inverting Buck-Boost Power Stages in Switch Mode Power Supplies (Rev. B) Mar 12, 2019
Application note Differences Between LM4600x/LM4360x A and Non-A OPNs Mar 27, 2018
White paper Synchronous Rectification in High-Performance Power Converter Design (Rev. A) PDF | HTML Sep 15, 2016
More literature SIMPLE SWITCHER Synchronous Regulator Series (Rev. B) Feb 8, 2016
Application note Cost-Effective Transformerless Offline Supply for Light Load Applications (Rev. A) Jun 16, 2015
Application note Cap Drop Offline Supply for E-Meters Jun 16, 2015
Technical article Inverting made simple by unleashing the buck PDF | HTML May 19, 2015
Application note Inverting Applications Made SIMPLE With LM4600x and LM4360x (Rev. B) Feb 20, 2015
Application note Thermal Design Made Simple With LM43603 and LM46002 Sep 15, 2014
Application note Low EMI Layout Made SIMPLE With LM43600/1/2/3 and LM46000/1/2 (Rev. A) Sep 12, 2014
Application note Compensation Made SIMPLE With LM4360x, LM4600x Jul 29, 2014
Application note AN-1997 Error Amplifier Limitations in High-Performance Regulator Applications (Rev. A) May 6, 2013
Application note AN-1533 Overvoltage Protection Circuit for Automotive Load Dump (Rev. B) May 6, 2013
Application note AN-2162 Simple Success With Conducted EMI From DC-DC Converters (Rev. C) Apr 24, 2013
Application note AN-2155 Layout Tips for EMI Reduction in DC/ DC Converters (Rev. A) Apr 23, 2013
Application note AN-1229 SIMPLE SWITCHER PCB Layout Guidelines (Rev. C) Apr 23, 2013
Application note AN-1197 Selecting Inductors for Buck Converters (Rev. B) Apr 23, 2013
Application note AN-1246 Stresses in Wide Input DC-DC Converters (Rev. C) Apr 23, 2013
Application note AN-1566 Techniques for Thermal Analysis of Switching Power Supply Designs (Rev. A) Apr 23, 2013
Application note AN-1149 Layout Guidelines for Switching Power Supplies (Rev. C) Apr 23, 2013
Application note AN-1889 How to Measure the Loop Transfer Function of Power Supplies (Rev. A) Apr 23, 2013
Application note AN-1520 A Guide to Board Layout for Best Thermal Resistance for Exposed Packages (Rev. B) Apr 23, 2013
Application note Understanding and Applying Current-Mode Control Theory Aug 19, 2007
Application note Input and Output Capacitor Selection Sep 19, 2005
More literature SEM1600 Topic 4: Constructing Your Power Supply – Layout Considerations Jul 12, 2005
Application note AN-643 EMI/RFI Board Design (Rev. B) May 3, 2004

Design & development

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

Simulation model

LM46001 Non-Inverting and Inverting PSpice Transient Model (Rev. A)

SLIM319A.ZIP (558 KB) - PSpice model
Supported products & hardware
Simulation model

LM46001 PSpice Average Model

SLIM320.ZIP (75 KB) - PSpice model
Supported products & hardware
Simulation model

LM46001 Unencrypted Non-Inverting and Inverting PSpice Transient Model (Rev. A)

SNVM726A.ZIP (7 KB) - PSpice model
Supported products & hardware
Simulation model

LM46001 Unencrypted PSpice Average Model

SNVM725.ZIP (1 KB) - PSpice model
Supported products & hardware
Reference design

TIDA-01051 — Reference Design Optimizing FPGA Utilization and Data Throughput for Automatic Test Equipment

The TIDA-01051 reference design is used to demonstrate optimized channel density, integration, power consumption, clock distribution and signal chain performance of very high channel count data acquisition (DAQ) systems such as those used in automatic test equipment (ATE). Using serializers, such (...)
Supported products & hardware
Reference design

TIDA-01054 — Multi-Rail Power Reference Design for Eliminating EMI Effects in High Performance DAQ Systems

The TIDA-01054 reference design helps eliminate the performance degrading effects of EMI on Data Acquisition (DAQ) systems greater than 16 bits with the help of the LM53635 buck converter. The buck converter enables the designer to place power solutions close to the signal path without the (...)
Supported products & hardware
Reference design

TIDA-01055 — ADC Voltage Reference Buffer Optimization Reference Design for High Performance DAQ Systems

The TIDA-01055 reference design for high performance DAQ Systems optimizes the ADC reference buffer to improve SNR performance and reduce power consumption with the TI OPA837 high-speed op amp. This device is used in a composite buffer configuration and provides a 22% power improvement over (...)
Supported products & hardware
Reference design

TIDA-01056 — 20-bit 1MSPS DAQ Reference Design Optimizing Power Supply Efficiency While Minimizing EMI

This reference design for high performance data acquisition (DAQ) systems optimizes power stage in order to reduce power consumption and minimize the effect of EMI from switching regulator by using LMS3635-Q1 buck converter.  This reference designs yields 7.2% efficiency improvement at most (...)
Supported products & hardware
Reference design

TIDA-01057 — Reference Design Maximizing Signal Dynamic Range for True 10 Vpp Differential Input to 20 bit ADC

This reference design is designed for high performance data acquisition(DAQ) systems to improve the dynamic range of 20 bit differential input ADCs. Many DAQ systems require the measurement capability at a wide FSR (Full Scale Range) in order to obtain sufficient signal dynamic range. Many earlier (...)
Supported products & hardware
Package Pins CAD symbols, footprints & 3D models
HTSSOP (PWP) 16 Ultra Librarian
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