LM61460-Q1

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Automotive 3-V to 36-V, 6-A, low-noise synchronous step-down converter

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Product details

Parameters

Vin (Min) (V) 3 Vin (Max) (V) 36 Vout (Min) (V) 1 Vout (Max) (V) 34 Iout (Max) (A) 6 Iq (Typ) (uA) 8 Switching frequency (Min) (kHz) 200 Switching frequency (Max) (kHz) 2200 Features Enable, Frequency Synchronization, Light Load Efficiency, Over Current Protection, Power Good, Soft Start Fixed, Spread Spectrum, Synchronous Rectification, Wettable Flanks Package Operating temperature range (C) -40 to 150 Rating Automotive Regulated outputs (#) 1 open-in-new Find other Buck converters (integrated switch)

Package | Pins | Size

VQFN-HR (RJR) 14 14 mm² 4 x 3.5 open-in-new Find other Buck converters (integrated switch)

Features

  • AEC-Q100 qualified for automotive applications
    • Temperature grade 1: –40°C to +150°C, TJ
  • Functional Safety-Capable
  • Optimized for ultra low EMI requirements
    • Hotrod™ package and parallel input path minimize switch node ringing
    • Spread spectrum reduces peak emissions
    • Adjustable SW node rise time
  • Designed for automotive applications
    • Supports 42-V automotive load dump
    • ±1% total output regulation accuracy
    • VOUT adjustable from 1 V to 95% of VIN
    • 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
    • 83% PFM efficiency at 1-mA, 13.5 VIN, 5 VOUT
    • External bias option for improved efficiency
  • Suitable for scalable power supplies
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Description

The LM61460-Q1 is an automotive-focused, high-performance, DC-DC synchronous step-down converter. 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; tolerant of 42 V, easing input surge protection design. The LM61460-Q1 implements soft recovery from dropout eliminating overshoot on the output.

The LM61460-Q1 is specifically designed for minimal EMI. The device incorporates pseudo-random spread spectrum, 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 set or 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 LM61460-Q1 Automotive 3-V to 36-V, 6-A, Low EMI Synchronous Step-Down Converter datasheet (Rev. F) Jun. 22, 2021
White paper 透過節省時間和成本的創新技術 降低電源中的EMI Dec. 04, 2020
White paper 전원 공급 장치의 EMI 절감을 위한 시간 및 비용 효율적 혁신 Dec. 04, 2020
Technical article Powering levels of autonomy: a quick guide to DC/DC solutions for SAE autonomy levels Nov. 18, 2020
Application note PCB Thermal Design Tips for Automotive DC/DC Converters Nov. 12, 2020
White paper Time-Saving and Cost-Effective Innovations for EMI Reduction Nov. 11, 2020
Technical article How device-level features and package options can help minimize EMI in automotive designs Aug. 21, 2020
White paper Demystifying Input Supply Current in DC/DC Regulators:From Shutdown to Full Load May 18, 2020
Functional safety information LM61460-Q1 Functional Safety FIT Rate and Failure Mode Distribution (Rev. A) Apr. 15, 2020
Application note Thermal design concerns for buck converters in high‐power automotive apps Mar. 19, 2020
User guide LM61460-Q1 EVM User's Guide (Rev. C) Dec. 12, 2019
Technical article Optimizing flip-chip IC thermal performance in automotive designs Dec. 11, 2019
Technical article Powering infotainment systems of the future Oct. 07, 2019
Application note Designing High Performance, Low-EMI, Automotive Power Supplies Sep. 30, 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
Description
The LM61460 evaluation module (EVM) is a fully assembled and tested circuit for evaluating the LM61460 synchronous step-down converter.  The LM61460 provides exceptional efficiency, low IQ, and low EMI in small solution size.
Features
  • Spread spectrum operation
  • Controlled recover from dropout
  • Low operating quiescent current
  • High efficiency
  • Low minimum on-time
  • Adjustable rise time

Design tools & simulation

SIMULATION MODEL Download
SNVMBW0A.ZIP (98 KB) - PSpice Model
SIMULATION MODEL Download
SNVMBW1A.ZIP (106 KB) - PSpice Model
SIMULATION MODEL Download
SNVMBW2A.ZIP (99 KB) - PSpice Model
SIMULATION MODEL Download
SNVMBX2A.TSC (187 KB) - TINA-TI Spice Model
SIMULATION MODEL Download
SNVMBX3A.TSC (176 KB) - TINA-TI Spice Model
SIMULATION MODEL Download
SNVMBX4A.TSC (187 KB) - TINA-TI Spice Model
SIMULATION MODEL Download
SNVMBX5A.TSC (176 KB) - TINA-TI Spice Model
SIMULATION MODEL Download
SNVMC09.TSC (188 KB) - TINA-TI Spice Model
SIMULATION MODEL Download
SNVMC10.TSC (177 KB) - TINA-TI Spice Model
SIMULATION MODEL Download
SNVMC61.ZIP (273 KB) - PSpice Model
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
  • (...)
CALCULATION TOOL Download
SNVR479.ZIP (745 KB)
PCB LAYOUT Download
SNVR478.ZIP (5000 KB)

Reference designs

REFERENCE DESIGNS Download
USB Type-C® dual-buck reference design
PMP22416 — This reference design is a USB Type-C® dual-output buck with 65-W output power and 98.8% efficiency. The design uses two LM61460 buck converters to step down a 21-V input and includes a 5-V bias voltage input to maximize efficiency. The USB Type-C design offers dual-output voltages of 5 V, 9 V, 15 V (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
High efficiency, low-noise 5-V/3.3-V/1.8-V/1.1-V automotive display reference design
PMP22334 — This reference design is for an automotive display application with a customized form factor. The design demonstrates the excellent thermal performance of LM61460-Q1 with its HotRod™ QFN package as well as the low EMI aided by its spread spectrum feature. It generates four (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
30-W power for automotive dual USB Type-C™ charge port reference design
PMP21771 — This reference design employs an LM61460-Q1 synchronous buck regulator that provides a total of 6 A of current to two TPS2557-Q1 load switch channels to provide 30W of total power to dual USB Type-C charge ports. The system is designed for high power efficiency and thermal performance and comes in a (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
VQFN-HR (RJR) 14 View options

Ordering & quality

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  • Ongoing reliability monitoring

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