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FEATURES

DESCRIPTION

UDG−97047−1

CAM

CAO

OVP

OVP (+ 17.5%)

OV

OV (+ 9%)

VSNS

VFB

Voltage

Amplifier

Current

Amplifier

3 V

UV

UV (−9%)

S

R

Q

Turn

On

Delay

Current Sense

Amplifier

RT

PWRGD

VDRVHI

GATEHI

PGND

Anti Cross

Condition

Turn

On

Delay

RT

VDRVLO

GATELO

Foldback

Current

Limit

1.37 V

VSNS

X16

COMP

ISOUT

IS−

IS+

Output Offset

5 V REF

D0

D1

D2

D3

D4

D/C Converter

2 V − 3.5 V, 100 mV

or

1.3 V − 2.05 V, 50 mV

COMMAND

CT

RT

OSC

VIN

10.5 V/10 V

UVLO

4.3 V/4.2 V

5 V

REF

GND

VREF

VIN

EN

4

6

15

16

8

7

27

26

24

23

22

6

1

20

14

13

2

19

18

12

10

11

28

21

9

17

UCC3882/-1

SLUS294A – MARCH 1999 – REVISED OCTOBER 2005

AVERAGE CURRENT MODE SYNCHRONOUS

CONTROLLER WITH 5-BIT DAC

•

Combined DAC/Voltage Monitor and PWM

The UCC3882 combines high precision reference and

With Synchronous Rectification Functions

voltage monitoring circuitry with average current

mode

PWM

synchronous

rectification

controller

•

5-Bit Digital-to-Analog (DAC) Converter

circuitry to power high-end microprocessors with a

•

1% DAC/Reference Combined Accuracy

minimum of external components. The UCC3882

•

Compatible with 5 V and 12 V Systems and 12

converts 5 V or 12 V to an adjustable output ranging

V-Only Systems

from 1.8VDC to 2.05VDC in 50 mV steps and

2.1VDC to 3.5VDC in 100 mV steps with 1% DC

•

Low Offset Current Sense Amplifier

system accuracy.

•

Programmable Oscillator Frequency Practical

to 700 kHz

•

Foldback Current Limiting

•

Overvoltage and Undervoltage Fault Windows

•

2-

Ω Totem Pole Outputs with Programmable

Dead Times to Eliminate Cross-Conduction

•

Chip Disable Function

BLOCK DIAGRAM

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 © 1999–2005, 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.