NCP5425

http://onsemi.com

6

PIN FUNCTION DESCRIPTION

Pin No.

Symbol

Description

1

GATE(H)1

High Side Switch FET driver pin for the channel 1 FET.

2

GATE(L)1

Low Side Synchronous FET driver pin for the channel 1 FET.

3

GND

Ground. All circuits are referenced to this pin. IC substrate connection.

4

BST

Power input for GATE(H)1 and GATE(H)2 pins.

5

NC

No connection.

6

NC

No connection.

7

IS+1

Positive input for channel 1 overcurrent comparator.

8

IS−1

Negative input for channel 1 overcurrent comparator.

9

Error amplifier inverting input for channel 1.

10

COMP1

Channel 1 Error Amp output. PWM comparator reference input. A capacitor to GND provides Error

Amp compensation. The same capacitor provides soft−start timing for channel 1. This pin also disables

the channel 1 output when pulled below 0.2 V.

11

COMP2

Channel 2 Error Amp output. PWM comparator reference input. A capacitor to GND provides Error

Amp compensation and soft−start timing for channel 2. Channel 2 output is disabled when this pin is

pulled below 0.2 V.

12

Error amplifier inverting input for channel 2.

13

Error amplifier noninverting input for channel 2.

14

IS+2

Positive input for channel 2 overcurrent comparator.

15

IS−2

Negative input for channel 2 overcurrent comparator.

16

MODE

Input pin used to inform internal circuitry of dual output or single output operation. Ground this pin for

dual output operation, leave open for single output operation.

17

A resistor from this pin to ground sets switching frequency.

18

Input Power supply pin. Power input for GATE(L)1 and GATE(L)2 pins.

19

GATE(L)2

Low Side Synchronous FET driver pin for the channel 2 FET.

20

GATE(H)2

High Side Switch FET driver pin for the channel 2 FET.