PCMB065T-2R2MS datasheet(4/21 Pages) IRF

4 / 21 page

IR3863MPBF

8/8/2012 Rev3.2

Pin Description

NAME

NUMBER

I/O

LEVEL

DESCRIPTION

FCCM

3.3V

Forced Continuous Conduction Mode (CCM). Ground this pin

to enable diode emulation mode or discontinuous conduction

mode (DCM). Pull this pin to 3.3V to operate in CCM under all

load conditions.

ISET

Connecting resistor to PHASE pin sets over current trip point.

PGOOD

Power good open drain output

– pull up with a resistor to 3.3V

GND

4,17

Reference

Bias return and signal reference.

3.3V

Inverting input to PWM comparator, OVP / PGOOD sense.

3.3V

Soft start/shutdown. This pin provides user programmable soft-

start function. Connect an external capacitor from this pin to

GND to set the startup time of the output voltage. The converter

can be shutdown by pulling this pin below 0.3V.

3VCBP

3.3V

For internal LDO. Bypass with a 1.0µF capacitor to AGND. A

resistor in series with the bypass capacitor may be required in

single-ground plane designs. Refer to Layout

Recommendations for details.

VCC

VCC input. Gate drive supply. A minimum of 1.0µF ceramic

capacitor is required.

PGND

Reference

Power return.

PHASE

VIN

Phase node (or switching node) of MOSFET half bridge.

VIN

Input voltage for the system.

BOOT

VIN +VCC

Bootstrapped gate drive supply

– connect a capacitor to

PHASE.

VIN

Input voltage feed forward

– sets on-time with a resistor to VIN.

Enable pin to turn on and off the device. Use two external

resistors to set the turn on threshold (see Electrical

Specifications) for input voltage monitoring.

PCMB065T-2R2MS Datasheet(PDF) 4 Page - International Rectifier

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