1

PRELIMINARY

August 1996

HIP9021

Portable Battery Drive/Torque Controller for

N-Channel MOSFETs in Motor Control Systems

Features

• MOSFET Driver and DC Motor Controller

• Torque Control and Overload Protection

• Battery Power Supply . . . . . . . . . . . . . . . . +5V to +15V

• BiMOS IC with Low Operating Current

- Maximum Supply Current . . . . . . . . . . . . . . . . .1.5mA

- Maximum Input Leakage Currents . . . . . . . . . . 1.5

µA

• 500

µA Maximum Supply Current

•1

µA Maximum Input Leakage Currents

• Typical Oscillator Frequency . . . . . . . . . . . . . . . . . 5kHz

• Power-On-Reset Control

• 10mA Drive Capability for Gate Output

Applications

• Portable Battery Operated Electric Drills

• Controller for Small DC Electric Motors

• Torque/Drive Controller for Inductive Loads

• Intelligent MOSFET Drive

Description

The HIP9021IB is a dedicated Power MOSFET driver which

drives a DC motor. As a system, motor speed is controlled

while controlling torque. The primary application is drive con-

trol for portable drills while providing overload protection.

The main function of the HIP9021IB is to produce a pulse

width modulated square wave signal which drives the gate of

an N-Channel Power MOSFET. The duty-cycle is deter-

mined by the setting of an external potentiometer at the

TRIGGER (speed control) input. As the TRIGGER voltage

level is decreased the duty-cycle of the square wave and the

speed of the motor is increased.

The torque of the motor is limited by the voltage level sensed

at the drain of the external Power MOSFET. When the cur-

rent reaches an adjustable limit set at the TORQUE input,

the drive of the Power MOSFET is disabled.

The system control components include 2 adjustable poten-

tiometer controls and 2 capacitors for the operating fre-

quency and torque delay control. A fixed or battery supply

voltage in the range of 5V to 15V may be used.

The HIP9021IB is provided in a small outline plastic package

for a compact surface mount to a ceramic substrate. The

surface mount assembly can be fit directly into the trigger of

a portable electric drill.

Pinout

HIP9021IB

(SOIC)

TOP VIEW

Ordering Information

PART NUMBER

TEMP.

PACKAGE

PKG.

NO.

HIP9021IB

-40 to +85

8 Ld SOIC

M8.15

DRAIN

TRIGGER

GND

OSC

1

2

3

4

8

7

6

5

GATE

DELAY

TORQUE

File Number

4055

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

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