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1 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

– 2.1-MHz and 400-kHz factory options

– 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

voltages

? 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:

? LM61440-Q1 (36 V, 4 A, adjustable fSW)

? LM61460-Q1 (36 V, 6 A, adjustable fSW)

? LMQ62440-Q1 (36 V, 4 A, internal

capacitors)

2 Applications

? Automotive infotainment and cluster: head unit,

media hub, USB charge, display

? Automotive ADAS and body electronics

3 Description

The LM62440-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; 42-V

tolerance supports load dump for durations of 400

ms. The LM62440-Q1 implements soft recovery from

dropout, eliminating overshoot on the output.

The LM62440-Q1 is specifically designed for minimal

EMI. The device incorporates pseudorandom spread

spectrum, adjustable SW node rise time, a low-EMI

VQFN-HR package featuring low switch node ringing,

and an 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, either 2.1-MHz or 400-

kHz frequency factory options 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, provides

exceptional efficiency across the entire load range.