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PI2002

Pin Description

Pin Number

Description

Pin

Name

10-Pin

DFN

SO-8

GND

1

1

Ground: This pin is ground for the gate driver and control circuitry.

GATE

2

2

Gate Drive Output: This pin drives the gates of the external Back-to-Back N-

channel MOSFETs. Under normal operating conditions, the GATE pin pulls high to

10V (typ) with respect to the SN pin. The controller turns the gate off during all fault

conditions except the Low Forward Current condition.

VC

3

3

Controller Input Supply: This pin is the supply pin for the control circuitry and gate

driver. Connect a 1μF capacitor between VC pin and the GND pin. Voltage on this

pin is limited to 15.5V by an internal shunt regulator. For high voltage auxiliary

supply applications connect a shunt resistor between VC and the auxiliary supply.

OCT

4

4

Over-Current Timer 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.

SCD

5

n/a

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. This pin is not available in the SO-8 package and the controller is set for

low Gate source current, 300µA.

FT

6

5

Fault State Output: This open collector output pulls low 40µs after 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.

SP

7

6

Positive Sense Input & Clamp: Connect SP pin to the input power source side of

the MOSFETs. The polarity and magnitude of the voltage difference between SP

and SN provides an indication of current flow through the MOSFETs.

SN

8

7

Negative Sense Input & Clamp: Connect SN to the output load side of the

MOSFET. The polarity and magnitude of the voltage difference between SP and SN

provides an indication of current flow through the MOSFETs.

UV

9

8

Input Under-Voltage Input: The UV pin is used 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.

OV

10

n/a

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.

This pin is not available in the SO-8 package and OV function is disabled.

Package Pin-Outs

10 Lead TDFN (3mm x 3mm)

Top view

8 Lead SOIC (5mm x 6mm)

Top view