Texas Instruments LM25139-Q1 Bedienungsanleitung

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LM25139-Q1 Automotive, 42V, Synchronous Buck DC/DC Controller With Dual

Random Spread Spectrum for Advanced EMI Mitigation

1 Features

•AEC-Q100 qualified for automotive applications:

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

ambient operating temperature

•Versatile synchronous buck DC/DC controller

–Wide input voltage range of 4V to 42V

–Fixed 3.3V, 5V or adjustable output voltage

from 0.8V to 36V

––40°C to 150°C junction temperature range

–Integrated high-current MOSFET gate drivers

with 1.65A source and 2.4A sink capability

–Lossless inductor DCR or shunt current sensing

–25ns t

ON(min)

for high V

IN

to V

OUT

conversion

–80ns t

OFF(min)

for high duty-cycle applications

–No-load sleep quiescent current of 10µA

–Shutdown quiescent current of 2.3µA

•Optimized for CISPR 25 Class 5 EMI requirements

–Dual Random Spread Spectrum (DRSS) with

5% or 10% frequency modulation

–Switching frequency from 100kHz to 3.2MHz

–Optional synchronization to an external clock

–Selectable PFM or FPWM operation

•Inherent protection features for robust design

–Hiccup-mode overcurrent protection

–Precision enable input and open-drain PGOOD

indicator for sequencing and control

–VCC and gate-drive UVLO protection

–Fixed 3ms output voltage soft start

–Thermal shutdown protection with hysteresis

•16-pin, 3mm × 3mm package with wettable flanks

•Create a custom design using the LM25139-Q1

with WEBENCH

®

Power Designer

2 Applications

•Automotive electronic systems

•Infotainment systems and instrument clusters

•Advanced driver assistance systems (ADAS)

•Body electronics and lighting

3 Description

The LM25139-Q1 is a 42V, synchronous, buck DC/DC

controller with ultra-low I

Q

for single-output, high-

current regulator circuits. Deriving from a family of

wide-V

IN

range automotive controllers, the device

uses a peak current-mode control architecture for fast

transient response, convenient loop compensation,

and excellent load and line regulation performance.

A high-side switch minimum on time of 25ns provides

large step-down ratios, enabling the direct conversion

from 12V and 24V automotive inputs to low-voltage

rails for reduced system design cost and complexity.

The LM25139-Q1 continues to operate during input

voltage dips as low as 4V, at nearly 100% duty cycle

if needed, making the device an excellent choice for

high-performance, automotive battery applications.

The LM25139-Q1 comes in a thermally enhanced, 16-

pin VQFN package with wettable flank pins and an

exposed pad to aid in thermal dissipation.

Package Information

PART NUMBERPACKAGE

(1)

PACKAGE SIZE

(2)

LM25139-Q1RGT (VQFN, 16)3mm × 3mm

(1)For more information, see Section 10.

(2)The package size (length × width) is a nominal value and

includes pins, where applicable.

FPWM/SYNC

AGND

PGND

VOUT

ISNS

LO

SW

HO

CBOOT

VIN

COMP

VCC

PG

EN

RT

LM25139-Q1

FB

R

RT

R

COMP

C

COMP

C

HF

C

VCC

C

BOOT

C

IN

C

OUT

R

S

L

O

V

IN

= 4V...36V

V

OUT

= 3.3V

SYNC

op



onal

Q

2

Q

1

VCC

Typical Schematic

LoadCurrent(A)

Efficiency(%)

0123456789101112

75

80

85

90

95

100

Vin=8V

Vin=12V

Vin=18V

Typical Efficiency, V

OUT

= 3.3V, F

SW

= 440kHz

LM25139-Q1

SNVSCF4 – JULY 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.

Produktspezifikationen