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LM61460-Q1 ACTIVE Automotive 3-V to 36-V, 6-A, low-noise synchronous step-down converter Smaller package, higher performance

Product details

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 Rating Automotive Regulated outputs (#) 1 Control mode Current Mode Duty cycle (Max) (%) 96
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 Rating Automotive Regulated outputs (#) 1 Control mode Current Mode Duty cycle (Max) (%) 96
WQFN (RNP) 30 24 mm² 6 x 4
  • 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
  • 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

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.

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) PDF | HTML 14 May 2021
Functional safety information LM73605-Q1 Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA PDF | HTML 12 Jul 2022
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 Designing High Performance, Low-EMI, Automotive Power Supplies 30 Sep 2017
EVM User's guide LM73605/LM73606 EVM User's Guide 20 Sep 2017

Design & development

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

Evaluation board

LM73605EVM-5V-2MHZ — LM73605 Synchronous Step-Down Converter Evaluation Module

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.
User guide: PDF
Not available on TI.com
Evaluation board

LM73605EVM-5V-400K — LM73605 Synchronous Step-Down Converter Evaluation Module

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.

User guide: PDF
Not available on TI.com
Simulation model

LM73605 Unencrypted PSpice Transient Model

SNVJ003.ZIP (9 KB) - Spice Model
Simulation model

LM73605 Inverting and non-inverting PSpice Transient Model

SNVMBD7.ZIP (955 KB) - PSpice Model
Simulation model

LM73605 TINA-TI Transient Reference Design

SNVMBE0.TSC (2316 KB) - TINA-TI Reference Design
Simulation model

LM73605 TINA-TI Transient Spice Model

SNVMBE1.ZIP (79 KB) - TINA-TI Spice Model
Simulation model

TINA-TI Enable Hysteresis Schematic

SNVMBL7.ZIP (4 KB) - TINA-TI Reference Design
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 (...)
Reference designs

TIDM-02009 — ASIL D safety concept-assessed high-speed traction, bi-directional DC/DC conversion reference design

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 (...)
Schematic: PDF
Reference designs

TIDA-050008 — ADAS power reference design with improved voltage supervision

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 (...)
Schematic: PDF
Reference designs

TIDA-01492 — Integrated Power Front End and Multi-Phase Processor Supply Automotive Reference Design

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 (...)
Schematic: PDF
Package Pins Download
WQFN (RNP) 30 View options

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