LM73605-Q1

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Automotive qualified 3.5-V to 36-V, 5-A synchronous step-down voltage converter

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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, Wettable Flanks Package Operating temperature range (C) -40 to 125 Rating Automotive Regulated outputs (#) 1 open-in-new Find other Buck converters (integrated switch)

Package | Pins | Size

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

Features

  • AEC-Q100-qualified for automotive applications
    • Device temperature grade 1: –40°C to +125°C ambient operating temperature
    • Device HBM ESD classification level 2 kV
    • Device CDM ESD classification level C5
  • Wettable flanks QFN package (WQFN)
  • Low EMI and low switching noise
  • 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)
  • Adjustable frequency range: 350 kHz to 2.2 MHz
  • Pin-selectable auto mode or forced PWM mode
  • Start-up into pre-biased load, fixed or adjustable soft-start time, and tracking
  • Synchronizable to external clock, internal compensation, power-good flag, and precision enable
  • Cycle-by-cycle current limiting, hiccup, UVLO, and thermal shutdown protections
  • Create a custom design with the WEBENCH power designer using LM73605-Q1 or LM73606-Q1
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Description

The LM73605-Q1/LM73606-Q1family of devices are easy-to-use synchronous step-down DC/DC converters capable of driving up to 5 A (LM73605-Q1)or 6 A (LM73606-Q1) of load current from a supply voltage ranging from 3.5 V to 36 V. The LM73605-Q1/LM73606-Q1 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 and optional external bias improve efficiency over the entire load range. The family requires few external components and has a pinout designed for simple PCB layout with optimal EMI and thermal performance. Protection features include thermal shutdown, input undervoltage lookout, cycle-cy-cycle current limiting, and hiccup short-citcuit protection. The LM73605-Q1 and LM73606-Q1 devices are pin-to-pin compatible for easy current scaling.

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Technical documentation

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Type Title Date
* Data sheet LM7360x-Q1 3.5-V to 36-V, 5-A or 6-A Synchronous Step-Down Voltage Converter datasheet (Rev. B) May 14, 2021
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
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
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

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
  • (...)
GERBER FILE Download
SNVC227.ZIP (40 KB)

Reference designs

REFERENCE DESIGNS Download
ASIL D safety concept-assessed high-speed traction, bi-directional DC/DC conversion reference design
TIDM-02009 This reference design demonstrates control of HEV/EV traction inverter and bi-directional DC-DC converter by a single TMS320F28388D real-time C2000™ MCU. The traction control uses a software-based resolver to digital converter (RDC) driving the motor to a high speed up to 20,000 RPM. The DC-DC (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
ADAS power reference design with improved voltage supervision
TIDA-050008 This automotive power reference design supports additional precision voltage supervision and window watchdog for safety MCUs in advanced driver assistance systems (ADAS). These ADAS systems can control driving functions, such as automated emergency brake, lane keep assist and adaptive cruise (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Integrated Power Front End and Multi-Phase Processor Supply Automotive Reference Design
TIDA-01492 — This processor supply reference design is an automotive power solution for use in high performance, single-core-voltage application processors in advanced driver assistance systems (ADASs). This design can support core supply currents up to 10 A at 0.9 V. The design can also operate with a wide (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
WQFN (RNP) 30 View options

Ordering & quality

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  • MSL rating/Peak reflow
  • MTBF/FIT estimates
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  • Qualification summary
  • Ongoing reliability monitoring

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