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LMQ61460-Q1

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Automotive 3-V to 36-V, 6-A low EMI synchronous step-down quiet converter with integrated capacitors

Product details

Vin (min) (V) 3 Vin (max) (V) 36 Vout (min) (V) 1 Vout (max) (V) 34 Iout (max) (A) 6 Iq (typ) (mA) 0.007 Switching frequency (min) (kHz) 200 Switching frequency (max) (kHz) 2200 Features Enable, Forced PWM, Frequency synchronization, Light Load Efficiency, Low Noise, Over Current Protection, Power good, Soft Start Fixed, Spread Spectrum, Synchronous Rectification, Wettable flanks package Operating temperature range (°C) -40 to 150 Rating Automotive TI functional safety category Functional Safety-Capable Regulated outputs (#) 1 Control mode current mode Duty cycle (max) (%) 98 Type Converter
Vin (min) (V) 3 Vin (max) (V) 36 Vout (min) (V) 1 Vout (max) (V) 34 Iout (max) (A) 6 Iq (typ) (mA) 0.007 Switching frequency (min) (kHz) 200 Switching frequency (max) (kHz) 2200 Features Enable, Forced PWM, Frequency synchronization, Light Load Efficiency, Low Noise, Over Current Protection, Power good, Soft Start Fixed, Spread Spectrum, Synchronous Rectification, Wettable flanks package Operating temperature range (°C) -40 to 150 Rating Automotive TI functional safety category Functional Safety-Capable Regulated outputs (#) 1 Control mode current mode Duty cycle (max) (%) 98 Type Converter
VQFN-HR (RJR) 14 14 mm² 4 x 3.5
  • AEC-Q100 qualified for automotive applications
    • Temperature grade 1: –40°C to +150°C, TJ
  • Functional Safety-Capable
  • Optimized for ultra-low EMI requirements
    • Meets CISPR25 class 5 standard
    • Hotrod™ package minimizes switch node ringing
    • Internal bypass capacitors reduce EMI
    • Parallel input path minimizes parasitic inductance
    • Spread spectrum reduces peak emissions
    • Adjustable switch node rise time
  • Designed for rugged automotive applications
    • Supports 42-V load dump
    • 0.4-V dropout with 4-A load (typical)
  • High efficiency power conversion at all loads
    • 7-µA no load current at 13.5 VIN, 3.3 VOUT
    • 90% PFM efficiency at 1-mA, 13.5 VIN, 5 VOUT
  • External bias option for improved efficiency
  • Pin compatible with:
  • AEC-Q100 qualified for automotive applications
    • Temperature grade 1: –40°C to +150°C, TJ
  • Functional Safety-Capable
  • Optimized for ultra-low EMI requirements
    • Meets CISPR25 class 5 standard
    • Hotrod™ package minimizes switch node ringing
    • Internal bypass capacitors reduce EMI
    • Parallel input path minimizes parasitic inductance
    • Spread spectrum reduces peak emissions
    • Adjustable switch node rise time
  • Designed for rugged automotive applications
    • Supports 42-V load dump
    • 0.4-V dropout with 4-A load (typical)
  • High efficiency power conversion at all loads
    • 7-µA no load current at 13.5 VIN, 3.3 VOUT
    • 90% PFM efficiency at 1-mA, 13.5 VIN, 5 VOUT
  • External bias option for improved efficiency
  • Pin compatible with:

The LMQ61460-Q1 is a high-performance, DC-DC synchronous buck converter with integrated bypass capacitors. With integrated high-side and low-side MOSFETs, up to 6 A of output current is delivered over a wide input range of 3.0 V to 36 V; 42-V tolerance supports load dump for durations of 400 ms. The device implements soft recovery from dropout eliminating overshoot on the output.

The device is specifically designed for minimal EMI. The device incorporates pseudo-random spread spectrum, integrated bypass capacitors, adjustable SW node rise time, low-EMI VQFN-HR package featuring low switch node ringing, and optimized pinout for ease of use. The switching frequency can be synchronized between 200 kHz and 2.2 MHz to avoid noise sensitive frequency bands. In addition the frequency can be selected for improved efficiency at low operating frequency or smaller solution size at high operating frequency.

Auto-mode enables frequency foldback when operating at light loads, allowing an unloaded current consumption of only 7 µA (typical) and high light load efficiency. Seamless transition between PWM and PFM modes, along with very low MOSFET ON resistances and an external bias input, ensures exceptional efficiency across the entire load range.

The LMQ61460-Q1 is a high-performance, DC-DC synchronous buck converter with integrated bypass capacitors. With integrated high-side and low-side MOSFETs, up to 6 A of output current is delivered over a wide input range of 3.0 V to 36 V; 42-V tolerance supports load dump for durations of 400 ms. The device implements soft recovery from dropout eliminating overshoot on the output.

The device is specifically designed for minimal EMI. The device incorporates pseudo-random spread spectrum, integrated bypass capacitors, adjustable SW node rise time, low-EMI VQFN-HR package featuring low switch node ringing, and optimized pinout for ease of use. The switching frequency can be synchronized between 200 kHz and 2.2 MHz to avoid noise sensitive frequency bands. In addition the frequency can be selected for improved efficiency at low operating frequency or smaller solution size at high operating frequency.

Auto-mode enables frequency foldback when operating at light loads, allowing an unloaded current consumption of only 7 µA (typical) and high light load efficiency. Seamless transition between PWM and PFM modes, along with very low MOSFET ON resistances and an external bias input, ensures exceptional efficiency across the entire load range.

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Technical documentation

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Type Title Date
* Data sheet LMQ61460-Q1 Automotive 3-V to 36-V, 6 A, Low EMI Synchronous Step-Down Converter datasheet (Rev. C) PDF | HTML 18 Jan 2021
Application note How to Implement a Simple Constant Current Regulation Scheme to a PCM Based Buck PDF | HTML 16 Aug 2023
White paper 了解提升功率密度的權衡與技術 (Rev. C) PDF | HTML 27 Apr 2023
White paper 전력 밀도를 높이는 것의 장단점 및 기술의 이해 (Rev. C) PDF | HTML 26 Apr 2023
White paper Abwägung der Vor- und Nachteile und Beschreibung der Technologien zur Verbesseru (Rev. C) PDF | HTML 14 Apr 2023
White paper Understanding the trade-offs and technologies to increase power density (Rev. C) PDF | HTML 14 Apr 2023
Technical article How buck regulators with integrated capacitors help lower EMI and save board space PDF | HTML 16 Mar 2022
More literature Advanced Power-Converter Features for Reducing EMI PDF | HTML 07 Dec 2021
User guide LMQ61460EVM-400K User's Guide (Rev. B) PDF | HTML 04 Jan 2021
Functional safety information LMQ6x4x0-Q1 Functional Safety, FIT Rate, FMD, and Pin FMA (Rev. A) PDF | HTML 09 Sep 2020
Technical article How device-level features and package options can help minimize EMI in automotive PDF | HTML 21 Aug 2020
Functional safety information Streamlining Functional Safety Certification in Automotive and Industrial 09 Jun 2020
White paper 簡化汽車及工業領域的功 能安全認證 09 Jun 2020
White paper 자동차 및 산업 분야의 기능적 안전성 인증 간소화 09 Jun 2020
Functional safety information LMQ61460-Q1 Functional Safety, FIT Rate, and Failure Mode Distribution 01 Apr 2020

Design & development

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

Evaluation board

LMQ61460EVM — 36-V, low-EMI 6-A, 5-V synchronous, 400 kHz, step-down converter evaluation module

The LMQ61460EVM evaluation module (EVM) is a fully assembled and tested circuit for evaluating the LMQ61460-Q1 synchronous step-down converter.  The LMQ61460-Q1 provides exceptional efficiency, low Iq, and low EMI in small solution size with integrated capacitors.
User guide: PDF | HTML
Not available on TI.com
Simulation model

LMQ61460AAS-Q1 PSpice Transient Model

SNVMC21.ZIP (112 KB) - PSpice Model
Simulation model

LMQ61460AFS-Q1 PSpice Transient Model

SNVMC23.ZIP (131 KB) - PSpice Model
Design tool

SNVR488 LMQ61460EVM-400K Design Files

Supported products & hardware

Supported products & hardware

Products
Buck converters (integrated switch)
LMQ61460 Industrial 3-V to 36-V, 6-A, low-noise synchronous step-down converter LMQ61460-Q1 Automotive 3-V to 36-V, 6-A low EMI synchronous step-down quiet converter with integrated capacitors
Hardware development
Evaluation board
LMQ61460EVM 36-V, low-EMI 6-A, 5-V synchronous, 400 kHz, step-down converter evaluation module
Design tool

SNVR493 LMQ61460 Design Tool

Supported products & hardware

Supported products & hardware

Products
Buck converters (integrated switch)
LMQ61460 Industrial 3-V to 36-V, 6-A, low-noise synchronous step-down converter LMQ61460-Q1 Automotive 3-V to 36-V, 6-A low EMI synchronous step-down quiet converter with integrated capacitors
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 (...)
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VQFN-HR (RJR) 14 View options

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