IR3871MPBF Просмотр технического описания (PDF) - International Rectifier

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производитель

IR3871MPBF

8A HIGHLY INTEGRATED WIDE-INPUT VOLTAGE, SYNCHRONOUS BUCK REGULATOR

International Rectifier 

Pin Description

IR3871MPBF

NAME

NC

ISET

PGOOD

GND

FB

SS

NC

3VCBP

NC

VCC

PGND

PHASE

VIN

BOOT

FF

EN

NUMBER

1

2

3

4,17

5

6

7

8

9

10

11

12

13

14

15

16

I/O

LEVEL

-----

5V

Reference

3.3V

3.3V

-----

3.3V

-----

5V

Reference

VIN

VIN

VIN +VCC

VIN

5V

DESCRIPTION

No connection.

Connecting resistor to PHASE pin sets over current trip point.

Power good open drain output – pull up with a resistor to 3.3V.

Bias return and signal reference.

Inverting input to PWM comparator, OVP / PGood sense.

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.

No connection.

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

from 3VCBP to GND.

No connection.

Gate drive supply. A minimum of 1.0µF ceramic capacitor must

be connected from this pin to the power return (PGND).

Power return.

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

Input voltage for the system.

Bootstrapped gate drive supply – connect a capacitor to

PHASE.

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.

4

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