Data Sheet No. PD94710

Page 1 of 1

12/17/04

IR3082

XPHASE

DESCRIPTION

The IR3082 Control IC combined with an IR XPhase

to implement a complete Opteron or Athlon64 power solution. The “Control” IC provides overall system

control and interfaces with any number of “Phase ICs” which each drive and monitor a single phase of a

multiphase converter. With simple 5 bit voltage programming and a few external components, the IR3082

is also well suited for general purpose multiphase applications. The XPhase

power supply that is smaller, less expensive, and easier to design while providing higher efficiency than

conventional approaches.

FEATURES

•

5 bit VID with 1% overall system set point accuracy

•

Programmable Dynamic VID Slew Rate

•

+/-300mV Differential Remote Sense

•

Programmable 150kHz to 1MHz oscillator

•

Programmable VID Offset and Load Line output impedance

•

Programmable Softstart

•

Programmable Hiccup Over-Current Protection with Delay to prevent false triggering

•

Simplified Power Good output provides indication of proper operation and avoids false triggering

•

Operates from 12V input with 9.75V Under-Voltage Lockout

•

7.0V/5mA Bias Regulator provides System Reference Voltage

•

Small thermally enhanced 20L MLPQ package

APPLICATION CIRCUIT

5 Wire Analog Bus

(to PHASE ICs)

VSS SENSE

VCC SENSE

POWER GOOD

10

C

S

S

/D

E

L

0.1uF

ROCSET

R

O

S

C

RVFB

0.1uF

RVDRP

ENABLE

IR3082

CONTROL

IC

VID0

1

VID1

2

VID2

3

VID3

4

VID4

5

P

W

R

G

D

1

9

V

O

S

N

S

-

6

V

D

A

C

8

S

S

/D

E

L

1

8

R

O

S

C

7

E

N

A

B

L

E

2

0

R

M

P

O

U

T

1

7

L

G

N

D

1

6

VCC

15

VBIAS

14

EAOUT

13

FB

12

VDRP

11

II

N

1

0

O

C

S

E

T

9

CVDAC

VID3

VID4

VID0

VID2

VID1

12V

RVDAC