BP3

GND

T

MON

V

IN

PWM-B

SRE-B

FLT-B

V

DIS

GG

I

-B

MON

BST-B

BSW-B

SW-B

PGND

PWM-A

SRE-A

FLT-A

I

-A

MON

BST-A

BSW-A

SW-A

PGND

V

GG

UCD7242

www.ti.com

SLUS962 – JANUARY 2010

Digital Dual Synchronous-Buck Power Driver

Check for Samples: UCD7242

1

FEATURES

APPLICATIONS

•

Digitally-Controlled Synchronous-Buck Power

•

Fully Integrated Power Switches With Drivers

Stages

for Dual Synchronous Buck Converters

•

High Current Dual-Phase VRM/EVRD

•

Full Compatibility With TI Fusion Digital Power

Regulators for Desktop, Server, Telecom and

Supply Controllers, Such as the UCD92xx

Notebook Processors

Family

•

Wide Input Voltage Range: 4.75 V to 18 V

Operational Down to 2.2 V Input With an

External Bias Supply

•

Up to 10A Output Current per Channel

•

Operational to 2 MHz Switching Frequency

•

High Side Current Limit With Current Limit

Flag

•

•

Thermal Protection

•

Temperature Sense Output – Voltage

Proportional to Chip Temperature

•

UVLO and OVLO Circuits Ensure Proper Drive

Voltage

•

Rated From –40°C to 125°C Junction

Temperature

•

RoHS Compliant

•

Accurate On-Die Current Sensing (±5%)

DESCRIPTION

The UCD7242 is a complete power system ready to drive two independent buck power supplies (see Figure 1).

High side MOSFETs, low side MOSFETs, drivers, current sensing circuitry and necessary protection functions

are all integrated into one monolithic solution to facilitate minimum size and maximum efficiency. Driver circuits

provide high charge and discharge current for the high-side NMOS switch and the low-side NMOS synchronous

voltage. This flexibility allows a wide power conversion input voltage range of 2.2V to 18V. Internal under voltage

The synchronous rectifier enable (SRE) pin controls whether or not the low-side MOSFET is turned on when the

PWM signal is low. When SRE is high the part operates in continuous conduction mode for all loads. In this

mode the drive logic block uses the PWM signal to control both the high-side and low-side gate drive signals.

Dead time is also optimized to prevent cross conduction. When SRE is low, the part operates in discontinuous

conduction mode at light loads. In this mode the low-side MOSFET is always held off.

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.

PRODUCTION DATA information is current as of publication date.

Copyright © 2010, 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.