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PI2122

Rev1.0

Pin Description

Pin Number Pin Name

Description

1, 15, 16, 17,

22,23, 24, 25

D2

Drain 2- Drain 2 of the internal Dual N-channel MOSFETs, connect to the output

load.

2, 3, 4, 5,

18,19,20, 21

D1

Drain 1- Drain 1 of the internal Dual N-channel MOSFETs, connect to the input

voltage.

6

SP

Positive Sense Input & Clamp: Connect SP pin to the D1 pin. The polarity and

magnitude of the voltage difference between SP and SN provides an indication of

current flow direction through the MOSFETs.

7

FT

Fault State Output: This open collector output pulls low after the 40usec fault timer

delay when a fault condition occurs. Fault logic inputs are VC Under-Voltage, input

Under-Voltage, input Over-Voltage, Forward Over-Current, Reverse Current, Low

Forward Current (or shorted switches) and Over-Temperature. Leave this pin open

if unused.

8

SCD

Short Circuit Detect Input: This input pin is for setting the load voltage where a

short circuit level is defined and detected. To enable slow MOSFET turn-on mode,

connect SCD to VC. Connect to load point for minimum threshold (0.335V) or use

resistor divider to increase threshold. Grounding pin enables the fast MOSFET turn

on mode.

9

OCT

Over Current Duty Cycle Input: Connecting a capacitor (≤ 20nF) sets the gate off

time once an over-current condition is detected. No capacitor on this pin will result

in minimum off time; 40µs. Pulling this input low will disable Gate drive.

10

VC

Controller Input Bias: Provides power to the controller. Connect a 1μF capacitor

between VC pin and ground. For high voltage applications connect a shunt resistor

between VC and the input supply. Voltage on this pin is regulated to 15.5V in high

voltage applications.

11

GND

Ground: This pin is ground for the control circuitry.

12

OV

Input Over Voltage Input: The OV pin detects when the input is greater than the

Over-Voltage threshold resulting in a low Fault pin. OV “AND” a Forward Current

condition turns the MOSFETs off. The input voltage OV threshold is programmable

through an external resistor divider. Connect OV to GND to disable this function.

13

UV

Input Under Voltage Input: The UV pin detects when the input is less than the

Under-Voltage threshold resulting in a low Fault pin. The input voltage UV

threshold is programmable through an external resistor divider. During an Under-

Voltage fault, the Gate is pulled low. Connect UV to VC to disable this function.

14

SN

Negative Sense Input & Clamp- Connect SN to D2 pin. The polarity and

magnitude of the voltage difference between SP and SN provides an indication of

current flow direction through the MOSFETs.

Package Pin-out

17 Pin LGA (5mm x 7mm)

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