IR3507

Page 1 of 19

Jan 09, 2008

DATA SHEET

DESCRIPTION

implement power solutions for the latest high performance CPUs and ASICs. The “Control” IC provides

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

expensive, and easier to design while providing higher efficiency than conventional approaches.

FEATURES IR3507 PHASE IC

•

Power State Indicator (PSI) interface provides the capability to maximize the efficiency at light loads.

•

7V/2A gate drivers (4A GATEL sink current)

•

Converter output voltage up to 5.1 V (Limited to VCCL-1.4V)

•

Loss-less inductor current sensing

•

Feed-forward voltage mode control

•

Integrated boot-strap synchronous PFET

•

Only four external components per phase

•

3 wire analog bus connects Control and Phase ICs (VID, Error Amp, IOUT)

•

3 wire digital bus for accurate daisy-chain phase timing control without external components

•

Anti-bias circuitry prevents excessive sag in output voltage during PSI de-assertion

•

PSI input is ignored during power up

•

Debugging function isolates phase IC from the converter

•

Self-calibration of PWM ramp, current sense amplifier, and current share amplifier

•

Single-wire bidirectional average current sharing

•

Small thermally enhanced 20L 4 X 4mm MLPQ package

•

RoHS compliant

APPLICATION CIRCUIT

VOUT-

12V

CLKIN

PHSOUT

PHSIN

VCCL

VOUT+

IOUT

DACIN

EAIN

PSI

CCS

CVCCL

DACIN

3

GATEH

14

VCCL

12

BOOST

13

PHSIN

5

IOUT

1

SW

15

LGND

4

PSI

2

NC

11

IR3507

COUT

L

RCS

CBST

Figure 1 Application Circuit