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LM61440-Q1

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Automotive 3-V to 36-V, 4-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) 4 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
    • Documentation available to aid functional safety system design
  • Optimized for ultra low EMI requirements
    • Hotrod™ package minimizes switch node ringing
    • Parallel input path minimizes parasitic inductance
    • 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
    • 0.3-V dropout with 3-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
    • Pin compatible with:

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Description

The LM61440-Q1 is an automotive-focused, high-performance, DC-DC synchronous step-down converter. With integrated high-side and low-side MOSFETs, up to 4 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 LM61440-Q1 implements soft recovery from dropout eliminating overshoot on the output.

The LM61440-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.

The LM61440-Q1 is qualified to automotive AEC-Q100 grade 1 and is available in a 14-pin VQFN-HR package with wettable flanks. Electrical characteristics are specified over a junction temperature range of –40°C to +150°C. Find additional resources in the Related Documentation.

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Technical documentation

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Type Title Date
* Datasheet LM61440-Q1 Automotive 3-V to 36-V, 4-A, Low EMI Synchronous Step-Down Converter datasheet (Rev. A) Mar. 20, 2020
Technical article Powering levels of autonomy: a quick guide to DC/DC solutions for SAE autonomy levels Nov. 18, 2020
Functional safety information LM61460-Q1 Functional Safety FIT Rate and Failure Mode Distribution (Rev. A) Apr. 15, 2020
Application note FIT Rate, Failure Mode Distribution LM61440 Q1 Mar. 31, 2020
Technical article Optimizing flip-chip IC thermal performance in automotive designs Dec. 11, 2019
Technical article Minimize the impact of the MLCC shortage on your power application Mar. 29, 2019

Design & development

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Design tools & simulation

SIMULATION MODEL Download
SNVMBY9.ZIP (147 KB) - PSpice Model
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SNVMBZ1.ZIP (143 KB) - PSpice Model
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PCB LAYOUT Download
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Package Pins Download
VQFN-HR (RJR) 14 View options

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