IR3087

PBF

DATA SHEET

DESCRIPTION

The IR3087 Phase IC combined with an IR XPhase

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

phase of a multiphase converter. The XPhase

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

The IR3087 with Opti-Phase

light load conditions. Both gate drivers will drive low at a programmable output current threshold. This

effectively disconnects the phase from the load eliminating power losses due to switching and circulating

currents.

FEATURES

•

2.5A Average Gate Drive Current

•

Loss-Less Inductor Current Sense

•

Internal Inductor DCR Temperature Compensation

•

Programmable Phase Delay

•

Programmable Feed-Forward Voltage Mode PWM Ramp

•

Sub 100ns Minimum Pulse Width supports 1MHz per-phase operation

•

Current Sense Amplifier drives a single wire Average Current Share Bus

•

Current Share Amplifier reduces PWM Ramp slope to ensure sharing between phases

•

Body Braking

output voltage at converter turn-off

•

Opti-Phase

•

OVP comparator with 150ns response

•

Programmable Phase Over-Temperature Detection

•

Small thermally enhanced 20L MLPQ package

APPLICATION CIRCUIT

RCS+

CCS-

CVCC

L

CVCCL

CSCOMP

20k

RBIASIN

DBST

CCS+

RVCC

RPWMRMP

CIN

RCS-

CBST

VO

RAMP

BIAS

DAC

VRHOT

EA

ISHARE

12V

CO

VGATE

5 Wire Analog Bus

From Control IC

RMPIN+

1

RMPIN-

2

GATEH

14

VCCH

15

HOTSET

3

VRHOT

4

PGND

13

GATEL

12

ISHARE

5

VCCL

11

IR3087

PHASE

IC

ROP1

ROP2

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