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LM62435-Q1

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Automotive 3-V to 36-V, 3.5-A, low EMI 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) 3.5 Iq (Typ) (mA) 0.007 Iq (Typ) (uA) 7 Switching frequency (Min) (kHz) 2200 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 and parallel input path minimize switch node ringing
    • Spread spectrum reduces peak emissions
    • Adjustable SW node rise time
    • Pin selectable FPWM mode for constant frequency at light loads
  • Designed for automotive applications
    • Supports 42 V automotive load dump
    • ±1% total output regulation accuracy
    • VOUT adjustable from 1 V to 95% of VIN, with factory options for 5-V and 3.3-V fixed output voltage
  • 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 LM62435-Q1 is an automotive-focused, high-performance, DC-DC synchronous step-down converter. With integrated high-side and low-side MOSFETs, up to 3.5 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 400ms. The LM62435-Q1 implements soft recovery from dropout eliminating overshoot on the output.

The LM62435-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 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
* Datasheet LM62435-Q1 Automotive 3-V to 36-V, 3.5-A, Low EMI Synchronous Step-Down Converter datasheet Dec. 20, 2019
Application notes LM62435-Q1 Functional Safety, FIT Rate, and Failure Mode Distribution Apr. 02, 2020
Technical articles Minimize the impact of the MLCC shortage on your power application Mar. 29, 2019

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VQFN-HR (RJR) 14 View options

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