LM5145 datasheet(1/73 Pages) TI2

Part #	LM5145

Description	LM25137 4V to 42V, 100% Duty Cycle Capable, Dual-Channel, Synchronous Buck DC/DC Controller

PDF	73 Pages

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Manufacturer	TI2 [Texas Instruments]

Direct Link	https://www.ti.com

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LM25137 4V to 42V, 100% Duty Cycle Capable, Dual-Channel, Synchronous Buck

DC/DC Controller

1 Features

• Functional Safety-Capable

– Documentation available to aid functional safety

system design

• Functional Safety-Compliant options – SIL 2 and

SIL 3 – available through request (LM25137F)

• Dual-channel synchronous buck DC/DC controller

– Wide input voltage range of 4V to 42V

– 1% accurate, fixed 3.3V, 5V, 12V, or adjustable

outputs from 0.8V to 36V

– 150°C maximum junction temperature

– Charge-pump gate drivers for 100% duty cycle

– No-load sleep current of 9µA (typical)

• Two interleaved synchronous buck channels

– Dual channel or single-output multiphase

– Stackable up to four phases

– SYNC in and SYNC out capability

– Selectable light-load PFM or FPWM

• Inherent protection features for robust design

– Internal hiccup-mode overcurrent protection

– Independent ENABLE and PGOOD functions

– Adjustable output voltage soft start

– VCC and gate-drive UVLO protection

– Shunt or inductor DCR current sensing

– Thermal shutdown protection with hysteresis

• Designed for ultra-low EMI requirements

– Dual Random Spread Spectrum (DRSS)

– Switching frequency from 100kHz to 2.64MHz

• VQFN-36 package with wettable flanks

• Create a custom design using the LM25137 with

WEBENCH® Power Designer

2 Applications

• Personal electronics: computer peripherals

• Industrial: 24V bus systems, power delivery

• Enterprise systems: high-performance computing

3 Description

The LM25137 is a 42V synchronous buck DC/DC

controller offered from a family with three options for

functional safety: Capable, SIL 2, and SIL 3. The

device uses an interleaved, stackable, peak current-

mode architecture for easy loop compensation, fast

transient response, excellent load and line regulation,

and accurate current sharing with paralleled phases

for high output current.

A high-side switch minimum on-time of 22ns facilitates

large step-down ratios, enabling the direct conversion

from 12V and 24V inputs to low-voltage rails for

reduced system design cost and complexity. The

LM25137 continues to operate during input voltage

dips as low as 4V, at 100% duty cycle if needed.

The 1.5μA sleep quiescent current with the output

voltage in regulation extends operating run-time in

battery-powered systems.

Package Information

PART NUMBER

PACKAGE(1)

PACKAGE SIZE(2)

LM25137

RHA (VQFN, 36)

6.0mm × 6.0mm

(1)

For more information, see Section 11.

(2)

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

includes pins, where applicable.

RT

RSS

PFM/SYNC

AGND

COMP2

VOUT2

ISNS2+

LO2

SW2

HO2

CBOOT2

VIN

COMP1

BIAS1/VOUT1

ISNS1+

LO1

SW1

HO1

CBOOT1

VCC

FB1

VDDA

FB2

SYNCOUT

CFNG

PG1

PG2

EN2

EN1

L

O1

C

OUT2

C

IN1

C

VDDA

L

O2

C

OUT1

R

S2

R

S1

Q

2

Q

1

R

SS

R

RT

R

CNFG

Q

4

Q

3

C

VCC

C

BOOT1

C

BOOT2

LM25137

VDDA

C

IN2

R

FB1

C

HF2

R

COMP2

C

COMP2

C

HF1

R

COMP1

C

COMP1

VDDA

R

FB2

V

IN = 4V...42V

V

OUT1 = 5V

I

OUT1 = 20A

* V

OUT1 tracks VIN if VIN < 5V

V

OUT2 = 3.3V

I

OUT2 = 20A

LM25137 Dual-Output Buck Switching Regulator – Simplified Schematic

LM25137

SNVSCU4 – 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. UNLESS OTHERWISE NOTED, this document contains PRODUCTION

DATA.

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