4

IR3876MBF

Pin Description

NAME

NUMBER

I/O

LEVEL

DESCRIPTION

NC

1

-----

No connection

ISET

2

Connecting resistor to PHASE pin sets over current trip point

PGOOD

3

5V

Power good – pull up to 3.3V

GND

4,17

Reference

Bias return and signal reference

FB

5

3.3V

Inverting input to PWM comparator, OVP / PGood sense

SS

6

3.3V

Set soft start slew-rate with a capacitor to GND

NC

7

-----

No connection

3VCBP

8

3.3V

LDO output. A minimum of 1.0 µF ceramic capacitor is required

NC

9

-----

No connection

VCC

10

5V

Gate drive supply

PGND

11

Reference

Power return

PHASE

12

VIN

Phase node (or switching node) of MOSFET half bridge

VIN

13

VIN

Input voltage for the system.

BOOT

14

VIN +VCC

Bootstrapped gate drive supply – connect a capacitor to PHASE

FF

15

VIN

Input voltage feed forward – sets on-time with a resistor to VIN

EN

16

5V

Enable