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APPLICATIONS

DESCRIPTION

Current

Limit Logic

ILIM

CLF

AGND

3V3

3V3

REG

DriveandDead-Time

ControlLogic

(D;1-D)

UVLO

I

DLY

+

CS

BIAS

CS+

BST

OUT1

SW

PVDD

OUT2

PGND

Enable

IO

+

0.6 V

POS

NEG

AO

VDD

+

ILIM/10

25x

Over

Current

IN

SRE

Blank

UCD7230

DLY

I

LOAD

PWM

SRE

V

OUT

I

DLY

V

IN

BIAS

I

MAX

CLF

UCD7230

SLUS741 – NOVEMBER 2006

Digital Control Compatible Synchronous Buck ±4-A Drivers with Current Sense

Conditioning Amplifier

• Digitally-Controlled Synchronous-Buck Power

• Input from Digital Controller Sets Operating

Stages for Single and Multi-Phase

Frequency and Duty Cycle

Applications

• Up to 2-MHz Switching Frequency

• Especially Suited for Use with UCD91xx or

• Dual Current Limit Protection with

UCD95xx Contollers

Independently Adjustable Thresholds

• High-Current Multi-Phase VRM/EVRD

• Fast Current Sense Circuit with 25-ns

Regulators for Desktop, Server, Telecom and

Propagation Delay and Adjustable Blanking

Notebook Processors

Interval Prevents Catastrophic Current Levels

• Digitally-Controlled Synchronous-Buck Power

Supplies Using

µCs or the TMS320TM DSP

• Digital Output Current Limit Flag

Family

• Low Offset, Gain of 25, Differential Current

Sense Amplifier

• 3.3-V, 10-mA Internal Regulator

The UCD7230 is part of the UCD7K family of digital

• Dual ±4-A TrueDrive™ High-Current Drivers

control compatible drivers for applications utilizing

• 10-ns Typical Rise/Fall Times with 2.2-nF

digital control techniques or applications requiring

Loads

fast local peak current limit protection.

• 25-ns Input-to-Output Propagation Delay

• 25-ns Current Sense-to-Output Propagation

Delay

• 4.5-V to 15.5-V Supply Voltage Range

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.

TrueDrive, PowerPAD are trademarks of Texas Instruments.

PRODUCT PREVIEW information concerns products in the

Copyright © 2006, Texas Instruments Incorporated

formative or design phase of development. Characteristic data and

other specifications are design goals. Texas Instruments reserves

the right to change or discontinue these products without notice.