RT/SYNC

BOOT1

EN/UVLO

AGND

CSG

SS

CS

PGND

VOSNS

HDRV1

SW1

COMP

LM5175-Q1

LDRV1

LDRV2

HDRV2

BOOT2

SW2

Enable

VCC

VCC

VCC

SLOPE

PGOOD

Power Good

Copyright © 2016, Texas Instruments Incorporated

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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.

LM5175-Q1

SNVSAD9 – APRIL 2016

1

1 Features

1

•

Qualified for Automotive Applications

•

AEC-Q100 Qualified with the following results:

–

Device Temperature Grade 1: –40°C to

+125°C Ambient Operating Temperature

Range

–

Device HBM ESD Classification Level 2

–

Device CDM ESD Classification Level C4B

•

Single Inductor Buck-Boost Controller for Step-

Up/Step-Down DC/DC Conversion

•

•

•

•

High Efficiency Buck-Boost Transition

•

Adjustable Switching Frequency

•

Optional Frequency Sync and Dithering

•

Integrated 2-A MOSFET Gate Drivers

•

Cycle-by-Cycle Current Limit and Optional Hiccup

•

Optional Input or Output Average Current Limiting

•

Programmable Input UVLO and Soft-Start

•

Power Good and Output Overvoltage Protection

•

Selectable CCM or DCM with Pulse Skipping

•

HTSSOP-28 Package

2 Applications

•

Automotive Start-Stop Systems

•

Backup Battery and Supercapacitor Charging

•

Industrial PC Power Supplies

•

USB Power Delivery

•

LED Lighting

3 Description

The LM5175-Q1 is a synchronous four-switch buck-

boost DC/DC controller capable of regulating the

output voltage at, above, or below the input voltage.

The LM5175-Q1 operates over a wide input voltage

range of 3.5 V to 42 V (60 V maximum) to support a

variety of applications.

The LM5175-Q1 employs current-mode control both

in buck and boost modes of operation for superior

load and line regulation. The switching frequency is

programmed by an external resistor and can be

synchronized to an external clock signal.

The device also features a programmable soft-start

function and offers protection features including

cycle-by-cycle current limiting, input undervoltage

lockout (UVLO), output overvoltage protection (OVP),

and thermal shutdown. In addition, the LM5175-Q1

features selectable Continuous Conduction Mode

(CCM) or Discontinuous Conduction Mode (DCM)

operation, optional average input or output current

limiting, optional spread spectrum to reduce peak

EMI,

and

optional

hiccup

mode

protection

in

sustained overload conditions.

Device Information(1)

ORDER NUMBER

PACKAGE

BODY SIZE

LM5175-Q1

HTSSOP-28

9.7 mm x 4.4 mm

(1) For all available packages, see the orderable addendum at

the end of the data sheet.

4 Simplified Schematic