Texas Instruments LM63460-Q1 Handleiding

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LM634x0-Q1 3V to 36V, 4A and 6A, Automotive Synchronous ZEN 1 Buck DC/DC

Converters With Adjustable Switching Frequency Optimized for Reliability

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 3V to 36V with

tolerance for load-dump transients up to 42V

–4A and 6A options available

–1% accurate adjustable output voltage from 1V

to 95% V

IN

–150°C maximum junction temperature

–Frequency adjustable from 200kHz to 2.2MHz

using the RT pin or a SYNC signal

•Improved reliability with optimized pinout design

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

•Zen 1 Switcher

–Enhanced HotRod

™

QFN package reduces

switch-node ringing

–Parallel input path minimizes parasitic

inductance

–Spread spectrum frequency modulation

–Selectable FPWM or PFM mode at light loads

•High efficiency across the full load range

–92.5% at 13.5V

IN

, 5V

OUT

, 6A, 2.1MHz

–7µA typical at 3.3V

OUT

no-load input current

–0.6µA typical shutdown quiescent current

–0.6V typical dropout at full load

–External bias option for improved efficiency

•Create a custom regulator design using the

LM634x0-Q1 with the WEBENCH

®

Power

Designer

2 Applications

•Automotive infotainment and cluster: head unit,

media hub, USB charge, display

•Automotive ADAS and body electronics

3 Description

The LM634x0-Q1 derives from a family of automotive,

synchronous, buck, DC/DC converters with excellent

efficiency and ultra-low I

Q

. With integrated high-side

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

delivered over a wide input voltage range from 3V to

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

The converter implements soft recovery from dropout

to eliminate overshoot on the output.

The LM634x0-Q1 with ZEN 1 switcher technology

incorporates numerous features for excellent EMI

performance, including spread-spectrum frequency

modulation, a low-EMI Enhanced HotRod QFN

package that mitigates switch-node ringing, and

a symmetrical pinout for excellent input capacitor

placement. The switching frequency can be set

between 200kHz and 2.2MHz to avoid sensitive

frequency bands, while optimizing efficiency or design

size based on the application requirements.

PFM mode enables frequency foldback during

light-load operation, allowing an unloaded current

consumption of only 7µA (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.

Device Information

PART NUMBERCURRENT

(1)

PACKAGE

(2)

LM63460-Q16A

RYF (VQFN, 22)

LM63440-Q14A

(1)See the Device Comparison Table.

(2)For more information, see Section 11.

PGOOD

EN/SYNC

PGND1

CBOOT

SW

FB

BIAS

VIN1

PGND2

VIN2

C

IN-HF1

C

IN-HF2

C

IN

C

BOOT

C

OUT

L

O

LM63460-Q1

V

OUT

= 5 V

I

OUT

= 6 A

V

IN

= 3 V...36 V

* V

OUT

tracks V

IN

if V

IN

< 5.6 V

2  47



F

0.76



H

0.1



F

1



F

10



F

10 nF

10 nF

R

FBT

RT

GND

VCC

C

VCC

R

FBB

R

RT

6.04 k



24.9 k



100 k



Typical Schematic

OutputCurrent(A)

Efficiency(%)

0123456

75

80

85

90

95

100

V

IN

=8V

V

IN

=12V

V

IN

=18V

V

IN

=24V

Efficiency, V

OUT

= 5V, f

SW

= 2.1MHz, LM63460-Q1

LM63440-Q1, LM63460-Q1

SNVSBW1D – DECEMBER 2021 – REVISED OCTOBER 2025

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

Product specificaties