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LM76003

ACTIVE

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

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Data sheet

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NEW LM65645-Q1 PREVIEW Automotive, 3V to 65V, 4.5A synchronous step-down converter optimized for power density and low EMI Higher efficiency, lower IQ and improved EMI mitigation features

LM76003

ACTIVE
Data sheet Order now

Product details

Rating Catalog Operating temperature range (°C) -40 to 125 Topology Buck Type Converter Iout (max) (A) 3.5 Vin (min) (V) 3.5 Vin (max) (V) 60 Switching frequency (min) (kHz) 300 Switching frequency (max) (kHz) 2200 Features Enable, Forced PWM, Frequency synchronization, Light Load Efficiency, Over Current Protection, Power good, Pre-Bias Start-Up, Synchronous Rectification, Tracking, Wettable flanks package Control mode current mode Vout (min) (V) 1 Vout (max) (V) 57 Iq (typ) (µA) 15 Duty cycle (max) (%) 98
Rating Catalog Operating temperature range (°C) -40 to 125 Topology Buck Type Converter Iout (max) (A) 3.5 Vin (min) (V) 3.5 Vin (max) (V) 60 Switching frequency (min) (kHz) 300 Switching frequency (max) (kHz) 2200 Features Enable, Forced PWM, Frequency synchronization, Light Load Efficiency, Over Current Protection, Power good, Pre-Bias Start-Up, Synchronous Rectification, Tracking, Wettable flanks package Control mode current mode Vout (min) (V) 1 Vout (max) (V) 57 Iq (typ) (µA) 15 Duty cycle (max) (%) 98
WQFN (RNP) 30 24 mm² 6 x 4
  • Integrated synchronous rectification
  • Input voltage 3.5 V to 60 V (65 V maximum)
  • Output current:
    • LM76002: 2.5 A
    • LM76003: 3.5 A
  • Output voltage 1 V to 95% VIN
  • 15-µA Quiescent current in regulation
  • Wide voltage conversion range
    • tON-MIN = 65 ns (typical)
    • tOFF-MIN = 95 ns (typical)
  • System-level features
    • Synchronization to external clock
    • Power-good flag
    • Precision enable
    • Adjustable soft-start (6.3 ms default)
    • Voltage tracking capability
  • Pin-selectable FPWM operation
  • Adjustable frequency range: 300 kHz to 2.2 MHz
  • High-efficiency at light-load architecture (PFM)
  • Protection features
    • Cycle-by-cycle current limit
    • Short-circuit protection with hiccup mode
    • Overtemperature thermal shutdown protection
  • Create a custom design using the LM76002/LM76003 with the WEBENCH® Power Designer
  • Integrated synchronous rectification
  • Input voltage 3.5 V to 60 V (65 V maximum)
  • Output current:
    • LM76002: 2.5 A
    • LM76003: 3.5 A
  • Output voltage 1 V to 95% VIN
  • 15-µA Quiescent current in regulation
  • Wide voltage conversion range
    • tON-MIN = 65 ns (typical)
    • tOFF-MIN = 95 ns (typical)
  • System-level features
    • Synchronization to external clock
    • Power-good flag
    • Precision enable
    • Adjustable soft-start (6.3 ms default)
    • Voltage tracking capability
  • Pin-selectable FPWM operation
  • Adjustable frequency range: 300 kHz to 2.2 MHz
  • High-efficiency at light-load architecture (PFM)
  • Protection features
    • Cycle-by-cycle current limit
    • Short-circuit protection with hiccup mode
    • Overtemperature thermal shutdown protection
  • Create a custom design using the LM76002/LM76003 with the WEBENCH® Power Designer

The LM76002/LM76003 regulator is an easy-to-use synchronous step-down DC-DC converter capable of driving up to 2.5 A (LM76002) or 3.5 A (LM76003) of load current from an input up to 60 V. The LM76002/LM76003 provides exceptional efficiency and output accuracy in a very small solution size. Peak current-mode control is employed. Additional features such as adjustable switching frequency, synchronization, FPWM option, power-good flag, precision enable, adjustable soft start, and tracking provide both flexible and easy-to-use solutions for a wide range of applications. Automatic frequency foldback at light load and optional external bias improve efficiency. This device requires few external components and has a pinout designed for simple PCB layout with best-in-class EMI (CISPR22) and thermal performance. Protection features include input undervoltage lockout, thermal shutdown, cycle-by-cycle current limit, and short-circuit protection. The LM76002/LM76003 device is available in the WQFN 30-pin leadless package with wettable flanks.

The LM76002/LM76003 regulator is an easy-to-use synchronous step-down DC-DC converter capable of driving up to 2.5 A (LM76002) or 3.5 A (LM76003) of load current from an input up to 60 V. The LM76002/LM76003 provides exceptional efficiency and output accuracy in a very small solution size. Peak current-mode control is employed. Additional features such as adjustable switching frequency, synchronization, FPWM option, power-good flag, precision enable, adjustable soft start, and tracking provide both flexible and easy-to-use solutions for a wide range of applications. Automatic frequency foldback at light load and optional external bias improve efficiency. This device requires few external components and has a pinout designed for simple PCB layout with best-in-class EMI (CISPR22) and thermal performance. Protection features include input undervoltage lockout, thermal shutdown, cycle-by-cycle current limit, and short-circuit protection. The LM76002/LM76003 device is available in the WQFN 30-pin leadless package with wettable flanks.
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Technical documentation

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Type Title Date
* Data sheet LM76002/LM76003 3.5-V to 60-V, 2.5-A/3.5-A Synchronous Step-Down Voltage Regulator datasheet (Rev. A) PDF | HTML 05 Sep 2019
Application note Controller to Converter – Design Considerations for 24V and 48V Systems PDF | HTML 02 Oct 2024
Application note Using Half-Bridge Gate Driver to Achieve 100% Duty Cycle for High Side FET PDF | HTML 25 Mar 2024
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 Top three qualities to consider when designing a video doorbell power supply PDF | HTML 25 Sep 2018
Technical article Effects of IC package on EMI performance PDF | HTML 22 May 2018

Design & development

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

Evaluation board

LM76003EVM-500K — LM76003 3.5V to 60V, 3.5A Synchronous Step-Down Voltage Converter Evaluation Module

The LM76003EVM-500K evaluation module (EVM) is a fully assembled and tested circuit for evaluating the LM76003 synchronous step-down converter. The EVM operates from an 3.5V to 60V input and provides a 3.3V or 5V output at 3.5A.
User guide: PDF
Not available on TI.com
Simulation model

LM76003 Non-Inverting and Inverting PSpice Transient Model (Rev. A)

SNVMBE9A.ZIP (297 KB) - PSpice Model
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Simulation model

LM76003 Unencrypted Pspice Non-Inverting and Inverting Transient Model (Rev. A)

SNVMBF3A.ZIP (9 KB) - PSpice Model
Download
Simulation model

TINA-TI Enable Hysteresis Schematic

SNVMBL7.ZIP (4 KB) - TINA-TI Reference Design
Download
Gerber file

DC/DC Converter Enable Hysteresis Calculator

SNVC227.ZIP (40 KB)
Download
Reference designs

TIDA-01606 — 10-kW, bidirectional three-phase three-level (T-type) inverter and PFC reference design

This verified reference design provides an overview on how to implement a three-level three-phase SiC based DC:AC T-type inverter stage. Higher switching frequency of 50KHz reduces the size of magnetics for the filter design and enables higher power density. The use of SiC MOSFETs with switching (...)
Design guide: PDF
Schematic: PDF
Reference designs

TIDA-010076 — Daisy-chained power and data over single pair Ethernet (T1) reference design

The TIDA-010076 shows the transfer of 220-W power and 100-Mbit/s data over SPE. Communication systems in daisy-chain topology need significantly less hardware and wiring than conventional systems in star-topology. When combined with single-pair Ethernet (SPE, 100BASE-T1) and power over data line, (...)
Design guide: PDF
Schematic: PDF
Reference designs

TIDA-010055 — Non-isolated power architecture with diagnostics reference design for protection relay modules

This reference design showcases non-isolated power supply architectures for protection relays with analog input/output and communication modules generated from 5-, 12-, or 24-V DC input. To generate the power supplies the design uses DC/DC converters with an integrated FET, a power module with an (...)
Design guide: PDF
Schematic: PDF
Reference designs

PMP15026 — Inverting Buck-Boost Converter With Variable Output Voltage Reference Design

This reference design uses the 60V, 3.5A LM76003 synchronous buck converter in an inverting buck-boost configuration to generate a variable negative output voltage. Dynamic variation of the output voltage allows use in applications requiring different output voltages without having to make (...)
Test report: PDF
Schematic: PDF
Package Pins CAD symbols, footprints & 3D models
WQFN (RNP) 30 Ultra Librarian
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