VBAT

VBUCKA

Reverse

Battery

MOSFET

Control

Internal

VREG

VBUCKB

ENB

ENA

SYNC

DLYAB

SSA

SSA

SoftStart

Buck

Enalbe

External

Sync

RCOSC

TPS43350-Q1

TPS43351-Q1

www.ti.com

SLVSAR7B – JUNE 2011 – REVISED MAY 2012

Check for Samples: TPS43350-Q1, TPS43351-Q1

1

FEATURES

2

•

Qualified for Automotive Applications

•

Frequency Spread Spectrum (TPS43351-Q1)

•

AEC-Q100 Test Guidance With the Following

•

Selectable Forced Continuous Mode or

Results:

Automatic Low-Power Mode at Light Loads

–

Device Temperature Grade 1: –40°C to

•

Sense Resistor or Inductor DCR Sensing

125°C Ambient Operating Temperature

•

Out-of-Phase Switching Between Buck

–

Device HBM ESD Classification Level H2

Channels

–

Device HBM CDM Classification Level C2

•

Peak Gate Drive Current 1.5 A

•

Two Synchronous Buck Controllers

•

Thermally Enhanced, 38-Pin HTSSOP (DAP)

PowerPAD™ Package

•

Input Range up to 40 V, (Transients up to 60 V)

•

APPLICATIONS

35 µA (Two Bucks On)

•

Automotive Infotainment, Navigation, and

•

Instrument Cluster Systems

•

Buck Output Range 0.9 V to 11 V

•

Industrial/Automotive Multi-Rail DC Power

•

Programmable Frequency and External

Distribution Systems and Electronic Control

Synchronization Range 150 kHz to 600 kHz

Units

•

Separate Enable Inputs (ENA, ENB)

DESCRIPTION

The TPS43350-Q1 and TPS43351-Q1 include two current-mode synchronous buck controllers designed for the

harsh environment in automotive applications. The part is ideally suited for a multi-rail system with low quiescent

requirements, as the part automatically operates in low-power mode (consuming only 30 µA) at light loads. The

part offers protection features such as thermal, soft-start, and overcurrent protection. During short-circuit

conditions of the regulator output, the current through the MOSFETs can be limited for power dissipation by

activation of the current foldback feature. The two independent soft-start inputs allow ramp-up of the output

voltage independently during start-up.

The switching frequency can be programmed over 150 kHz to 600 kHz or synchronized to an external clock in

the same range. Additionally, the TPS43351-Q1 offers frequency-hopping spread-spectrum operation.

spacer

Figure 1. Typical Application Diagram

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2

PowerPAD is a trademark of Texas Instruments.

PRODUCTION DATA information is current as of publication date.

Copyright © 2011–2012, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.