Texas Instruments LMQ644A2-Q1 Bedienungsanleitung

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LMQ644xx-Q1 3V to 36V, Low I

Q

, Dual 6/5/4A, Automotive Buck Converter Optimized

for Power Density and Low EMI

1 Features

•AEC-Q100 qualified for automotive applications:

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

ambient operating temperature

–Operation up to 150°C junction temperature

•Functional Safety-Capable

–Documentation available to aid functional safety

system design

•Designed for Low EMI

–Symmetrical input voltage pins with > 1mm

clearance to ground

–Four 22nF integrated VIN to GND bypass

capacitors

•Two bypass capacitors placed in series

between each VIN and GND for high

reliability

–Pin selectable spread spectrum option

–Pin selectable FPWM or auto mode operation

–Enhanced HotRod

™

QFN (25) package with

wettable flanks

–Switching frequency from 100kHz to 2.2MHz

–Meets CISPR 25 class 5 EMI requirements

•Single and dual-output features

–Wide input voltage range of 3V to 36V

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

outputs from 0.8V to 20V

–Hiccup-mode overcurrent protection and

thermal shutdown protection with hysteresis

–Precision ENABLE and PGOOD functions

–50ns t

ON(min)

for high V

IN

/ V

OUT

ratio

–80ns t

OFF(min)

for low dropout

•Versatile dual-output operation

–Shutdown mode current: 0.5µA typical

–No-load standby current: 9µA typical

–Built-in compensation and 3ms soft start

–Independent precision ENABLE and PGOOD

•Adaptable single-output operation

–> 95% efficient for an 8A load, single output,

V

IN

=12V, V

OUT

= 5V

–External compensation and adjustable soft start

–PGOOD, SYNCIN, and SYNCOUT functions

2 Applications

•Automotive infotainment and cluster: head unit,

media hub, USB charge, display

•Automotive ADAS and body electronics

•General-purpose dual buck converters

3 Description

The LMQ644xx-Q1 is a 36V, synchronous, buck,

DC/DC converter for high-current single or dual

outputs. The device uses an interleaved, stackable,

current-mode control architecture for easy loop

compensation, fast transient response, excellent load

and line regulation, and accurate current sharing with

an output clock supporting up to 6 phases for currents

up to 36A. A high-side switch minimum on-time of

50ns gives large step-down ratios, enabling the direct

conversion from 12V, 24V, or automotive inputs to

low-voltage rails for reduced system complexity and

design cost.

The LMQ644xx-Q1 incorporates spread spectrum

in an optimized enhanced HotRod QFN package,

with wettable flanks, and four 22nF high frequency

integrated capacitors to minimize EMI. Dual Random

Spread Spectrum (DRSS) frequency hopping is set to

±10% (typical), drastically reducing emissions through

a combination of triangular and pseudo-random

modulation. A bias pin allows the LMQ644xx-Q1

to save losses by powering the device from the

output of the converter, achieving a 9μA no-load

quiescent current to extend the operating run-time

in battery-powered systems. The LMQ644xx-Q1 can

maintain high efficiency light-load operation even

when stacking multiple devices for high efficiency over

the full load range.

Device Information

PART NUMBER

(2)

PACKAGE

(1)

BODY SIZE

(NOM)

LMQ644A2-Q1

RXA (VQFN-FCRLF, 24)4.0mm × 5.0mmLMQ644A0-Q1

LMQ64480-Q1

(1)For more information, see Section 11.

(2)See the Device Comparison Table.

CISPR 25 Conducted, V

OUT

= 3.3V, 2.1MHz, 12A

LMQ64480-Q1, LMQ644A0-Q1, LMQ644A2-Q1

SNVSC42A – SEPTEMBER 2023 – REVISED JULY 2024

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.

Produktspezifikationen