TLH12317

April 1995

LM9061

Power MOSFET Driver with Lossless Protection

General Description

The LM9061 is a charge-pump device which provides the

gate drive to any size external power MOSFET configured

as a high side driver or switch A CMOS logic compatible

ONOFF input controls the output gate drive voltage In the

ON state the charge pump voltage which is well above the

MOSFET A built-in 15V zener clamps the maximum gate to

source voltage of the MOSFET When commanded OFF a

110 mA current sink discharges the gate capacitances of

the MOSFET for a gradual turn-OFF characteristic to mini-

mize the duration of inductive load transient voltages and

further protect the power MOSFET

Lossless protection of the power MOSFET is a key feature

device is continually monitored and compared against an

externally programmable threshold voltage A small current

sensing resistor in series with the load which causes a loss

of available energy is not required for the protection circuit-

exceed the threshold voltage the output is latched OFF in a

more gradual fashion (through a 10 mA output current sink)

after a programmable delay time interval

Designed for the automotive application environment the

can withstand 60V power supply transients The LM9061 is

available in an 8-pin small outline package and an 8-pin

dual in-line package

Features

Y

Built-in charge pump for gate overdrive of high side

drive applications

Y

Lossless protection of the power MOSFET

Y

Programmable MOSFET protection voltage

Y

Programmable delay of protection latch-OFF

Y

Fast turn-ON (15 ms max with gate capacitance of

25000 pF)

Y

Y

Y

Withstands 60V supply transients

Y

CMOS logic compatible ONOFF control input

Y

Surface mount and dual in-line packages available

Applications

Y

Valve relay and solenoid drivers

Y

Lamp drivers

Y

DC motor PWM drivers

Y

Logic controlled power supply distribution switch

Y

Electronic circuit breaker

Typical Application

TLH12317 – 1

Connection Diagrams

TLH12317 – 3

Top View

Order Number LM9061M

See NS Package Number M08A

TLH12317 – 2

Top View

Order Number LM9061N

See NS Package Number N08E

C1995 National Semiconductor Corporation

RRD-B30M115Printed in U S A