MIC5022

Micrel

MIC5022

178

September 1999

MIC5022

Half-Bridge MOSFET Driver

Features

• 12V to 36V operation

• 600ns rise time into 1000pF (high side)

• TTL compatible input with internal pull-down resistor

• Outputs interlocked to prevent cross conduction

• TTL compatible enable

• Fault output indication

• Individual overcurrent limits

• Gate protection

• Internal charge pump (high-side)

• Current source drive scheme reduces EMI

Applications

• Motor control

• Switch-mode power supplies

General Description

The MIC5022 half-bridge MOSFET driver is designed to

operate at frequencies up to 100kHz (5kHz PWM for 2% to

100% duty cycle) and is an ideal choice for high speed

applications such as motor control and SMPS (switch mode

power supplies).

A rising or falling edge on the input results in a current source

pulse or sink pulse on the gate outputs. This output current

pulse can turn on a 2000pF MOSFET in approximately 1

µs.

The MIC5022 then supplies a limited current (< 2mA), if

necessary, to maintain the output states.

Two overcurrent comparators with nominal trip voltages of

50mV make the MIC5022 ideal for use with current sensing

MOSFETs. External low value resistors may be used instead

of sensing MOSFETs for more precise overcurrent control.

Optional external capacitors placed on the C

may be used to individually control the current shutdown duty

cycles from approximately 20% to <1%. Duty cycles from

20% to about 75% are possible with individual pull-up resis-

tors from C

An open collector output

provides a fault indication when either sense input is tripped.

The MIC5022 is available in 16-pin wide SOIC and 14-pin

plastic DIP packages.

Other members of the MIC502x family include the MIC5020

low-side driver and the MIC5021 high-side driver.

Typical Application

Input

Fault

Enable

Gnd

Gate H

Sense H–

Sense H+

Gate L

Sense L–

Sense L+

10µF

2.7nF

M

+12V to +36V

MIC5022

TTL Input

(PWM signal)

1

2

3

4

5

6

7

14

13

12

11

10

9

8

DC Motor Control Application

Ordering Information

Part Number

Temperature Range

Package

MIC5022BWM

–40

°C to +85°C

16-pin Wide SOIC

MIC5022BN

–40

°C to +85°C

14-pin Plastic DIP