1 Features

• AEC-Q100 qualified for automotive applications

– Device temperature grade 1: –40°C to +125°C

ambient operating temperature

• Functional Safety-Capable

– Documentation available to aid functional safety

system design

• Versatile synchronous buck DC/DC converter

– Wide input voltage range of 3 V to 36 V with

tolerance for load-dump transients up to 42 V

– 1 accurate, fixed 3.3-V, 5-V, or adjustable

output voltage from 1 V to 95 VIN

– 150°C maximum junction temperature

– Fixed 2.1-MHz switching frequency (adjustable

from 200 kHz to 2.2 MHz using a SYNC signal)

• Improved reliability with optimized pinout design

and clearance for short-circuit-to-adjacent-pin test

• Optimized for low EMI requirements

– Enhanced HotRod™ QFN package with dual

input paths reduces switch-node ringing

– Pin-configurable spread spectrum modulation

– Selectable FPWM or PFM mode at light loads

• High efficiency across the full load range

– 92.5 at 13.5 VIN, 5 VOUT, 6 A, 2.1 MHz

– No-load input current: 7-μA typical at 3.3 VOUT

– Shutdown quiescent current: 0.6-μA typical

– 0.6-V typical dropout at 6-A load

– External bias option for improved efficiency

• Create a custom regulator design using the

LM64460-Q1 with WEBENCH® Power Designer

2 Applications

• Automotive infotainment and cluster: head unit,

media hub, USB charge, display

• Automotive ADAS and body electronics

3 Description

The LM64460-Q1 derives from a family of automotive

synchronous buck DC/DC converters with excellent

efficiency and ultra-low IQ. With integrated high-side

and low-side MOSFETs, up to 6 A of output current is

delivered over a wide input voltage range from 3 V to

36 V, with support for load-dump transients up to 42 V.

The converter implements soft recovery from dropout

to eliminate overshoot on the output.

The LM64460-Q1 incorporates numerous features

for excellent EMI performance, including spreadspectrum

frequency modulation, a low-EMI Enhanced

HotRod QFN package that mitigates switch-node

ringing, and a symmetrical pinout for ideal input

capacitor placement. The switching frequency is

synchronizable between 200 kHz and 2.2 MHz to

avoid sensitive frequency bands, while optimizing

efficiency or design size based on the specific

requirements of the application.

PFM mode enables frequency foldback during

light-load operation, allowing an unloaded current

consumption of only 7 μA (typical) and high light-load

efficiency. A seamless transition between PWM and

PFM modes, along with low MOSFET on-resistances

and an external bias input, provides exceptional

efficiency and thermal performance across the entire

load range. The package has several NC pins

between critical power pins, which improve the Failure

Modes and Effects Analysis (FMEA) result.