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LM73605

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3.5V to 36V, 5A Synchronous Step-Down Voltage Converter

Data sheet
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3.5V to 36V, 5A Synchronous Step-Down Voltage Converter

LM73605

ACTIVE
Data sheet Order now

Product details

Parameters

Vin (Min) (V) 3.5 Vin (Max) (V) 36 Vout (Min) (V) 1 Vout (Max) (V) 34 Iout (Max) (A) 5 Iq (Typ) (uA) 15 Switching frequency (Min) (kHz) 350 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, UVLO Fixed, Wettable Flanks Package, Soft Start Adjustable Operating temperature range (C) -40 to 125 Rating Catalog Regulated outputs (#) 1 open-in-new Find other Buck converters (integrated switch)

Package | Pins | Size

WQFN (RNP) 30 24 mm² 6 x 4 open-in-new Find other Buck converters (integrated switch)

Features

  • New product available: LM61460 60-V, 6-A synchronous converter
  • Synchronous rectification
  • Wettable flanks QFN package (WQFN)
  • Low quiescent current
    • 0.8 µA in shutdown (typical)
    • 15 µA in active mode with no load (typical)
  • Wide voltage conversion range:
    • tON-MIN = 60 ns (typical)
    • tOFF-MIN = 70 ns (typical)
  • Low MOSFET ON-resistance:
    • RDS_ON_HS = 53 mΩ (typical)
    • RDS_ON_LS = 31 mΩ (typical)
  • External bias input to improve efficiency
  • Pin-selectable auto mode or forced PWM operation
  • Adjustable frequency range: 350 kHz to 2.2 MHz
  • Synchronizable to external clock
  • Internal compensation
  • Power-good flag
  • Precision enable to program system UVLO
  • Flexible soft-start features:
    • Start-up into pre-biased load
    • Fixed or adjustable soft-start time
    • Output voltage tracking
  • Cycle-by-cycle current limiting
  • Short-circuit protection with hiccup mode
  • Create a custom design with the WEBENCH® power designer using LM73605 or LM73606
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Description

The LM73605 and LM73606 family of devices are easy-to-use synchronous step-down DC/DC converters capable of driving up to 5 A or 6 A of load current from a supply voltage ranging from 3.5 V to 36 V. The LM73605 and LM73606 provide 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 to an external clock, 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 improves efficiency over the entire load range. Protection features include thermal shutdown, cycle-by-cycle current limiting, and short-circuit protection. The devices are pin-to-pin compatible for easy current scaling. The new product, LM61460-Q1, offers higher efficiency, lower stand-by quiescent current, and improved EMI performance. See the device comparison table to compare specifications. Start a Webench design with LM61460-Q1. Use the LMZM33606 module for faster time to market.

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LM61460 ACTIVE 3-V to 36-V, 6-A, Low-EMI synchronous step-down converter 3-V to 36-V, 6-A, low-noise synchronous step-down converter.

Technical documentation

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Type Title Date
* Data sheet LM73605/LM73606 3.5-V to 36-V, 5-A or 6-A Synchronous Step-Down Voltage Converter datasheet (Rev. A) Jul. 21, 2017
Application note Step-Dwn (Buck) Convrtr Pwer Solutions for Programmable Logic Controller Systems (Rev. A) Jul. 26, 2021
Selection guide Buck Converter Quick Reference Guide (Rev. B) Apr. 08, 2021
Technical article Minimize the impact of the MLCC shortage on your power application Mar. 29, 2019
Technical article How to add hysteresis to a DC/DC converter Nov. 12, 2018
Technical article Effects of IC package on EMI performance May 22, 2018
Technical article Vary the output voltage in an inverting buck-boost topology Oct. 12, 2017
Application note Designing High Performance, Low-EMI, Automotive Power Supplies Sep. 30, 2017
User guide LM73605/LM73606 EVM User's Guide Sep. 20, 2017

Design & development

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

Hardware development

EVALUATION BOARD Download
document-generic User guide
49
Description
The LM73605EVM-5V-2MHZ evaluation module (EVM) is a fully assembled and tested circuit for evaluating the LM73605 synchronous step-down voltage converter. The EVM operates from 6V to 36V input and provides a 5V output voltage with 5A maximum load current.
Features
  • High Efficiency at light loads and heavy loads
  • Synchronous Rectification
  • Wide-Input Voltage Range
  • Auto mode or FPWM mode
  • Frequency Synchronization
  • Low Quiescent Current
View details
EVALUATION BOARD Download
document-generic User guide
49
Description

The LM73605EVM-5V-400K evaluation module (EVM) is a fully assembled and tested circuit for evaluating the LM73605 synchronous step-down voltage converter. The EVM operates from 6V to 36V input and provides a 5V output voltage with 5A maximum load current.

Features
  • High Efficiency at light loads and heavy loads
  • Synchronous Rectification
  • Wide-Input Voltage Range
  • Auto mode or FPWM mode
  • Frequency Synchronization
  • Low Quiescent Current
View details

Design tools & simulation

SIMULATION MODEL Download
SNVJ003.ZIP (9 KB) - Spice Model
SIMULATION MODEL Download
SNVMBD7.ZIP (955 KB) - PSpice Model
SIMULATION MODEL Download
SNVMBE0.TSC (2316 KB) - TINA-TI Reference Design
SIMULATION MODEL Download
SNVMBE1.ZIP (79 KB) - TINA-TI Spice Model
SIMULATION MODEL Download
SNVMBL7.ZIP (4 KB) - TINA-TI Reference Design
SIMULATION TOOL Download
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — 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 (...)
Features
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)
View details
GERBER FILE Download
SNVC227.ZIP (40 KB)

Reference designs

REFERENCE DESIGNS Download
High efficiency power supply architecture reference design for protection relay processor module
TIDA-010011 — This reference design showcases various power architectures for generating multiple voltage rails for an application processor module, requiring >1A load current and high efficiency . The required power supply is generated using 5-, 12- or 24-V DC input from the backplane. Power supplies are (...)
document-generic Schematic
REFERENCE DESIGNS Download
Low-Noise Fixed Drop-Out ±2.5 to ±12-VOUT 3A Power Supply Reference Design for Ultrasound CW Pulser
TIDA-01458 — This reference design allows a digitally programmable power supply to power an ultrasound transmit circuit for continuous wave (CW) mode from a 24-V bus. There are two outputs adjustable from ±2.5 to ±12 V under user software control. These outputs can provide up to 2 A with very low (...)
document-generic Schematic
REFERENCE DESIGNS Download
Dual USB Car Charger Reference Design with Port Power Management
PMP11670 — The PMP11670 reference design is a dual channel USB charger for automotive application. It includes a high performance buck converter which provides total 3.5A load current for both channels. The Port Power Management feature of port controllers improves the thermal performance by limiting the max (...)
document-generic Schematic

CAD/CAE symbols

Package Pins Download
WQFN (RNP) 30 View options

Ordering & quality

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  • Ongoing reliability monitoring

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