July 2000

1

MIC5013

MIC5013

Micrel

Fault

V+

Gate

1

2

3

4

8

MIC5013

Gnd

7

6

5

Thresh

Sense

Source

Input

=24V

IRCZ44

(S=2590,

R=11m

Ω)

10µF

43

Ω

20k

Ω

4.3k

Ω

R

R1

Figure 1. High-Side Driver with

Current-Sensing MOSFET

LOAD

Control Input

V

+

+

S

R1=

100mV

SRR

(SR+R )

V

+

SR(

+100mV)

R I – (

+100mV)

R =

R

=

–1000

2200

V

TRIP

S

For this example:

=30A (trip current)

I

L

=100mV

V

TRIP

S

S

TH

V

TRIP

V

TRIP

L

R

TH

SENSE

SOURCE

KELVIN

MIC5013

Protected High- or Low-Side MOSFET Driver

General Description

The MIC5013 is an 8-pin MOSFET driver with over-current

shutdown and a fault flag. It is designed to drive the gate of

an N-channel power MOSFET above the supply rail high-side

power switch applications. The MIC5013 is compatible with

standard or current-sensing power MOSFETs in both high-

and low-side driver topologies.

The MIC5013 charges a 1nF load in 60

µs typical and protects

the MOSFET from over-current conditions. The current sense

trip point is fully programmable and a dynamic threshold

allows high in-rush current loads to be started. A fault pin

indicates when the MIC5013 has turned off the FET due to

excessive current.

Other members of the Micrel driver family include the MIC5011

minimum parts count driver and MIC5012 dual driver.

Features

• 7V to 32V operation

• Less than 1

µA standby current in the “OFF” state

• Available in small outline SOIC packages

• Internal charge pump to drive the gate of an N-channel

power FET above supply

• Internal zener clamp for gate protection

• 60

µs typical turn-on time to 50% gate overdrive

• Programmable over-current sensing

• Dynamic current threshold for high in-rush loads

• Fault output pin indicates current faults

• Implements high- or low-side switches

Applications

• Lamp drivers

• Relay and solenoid drivers

• Heater switching

• Power bus switching

• Motion control

Ordering Information

Part Number

Temperature Range

Package

MIC5013BN

–40

°C to +85°C

8-pin Plastic DIP

MIC5013BM

–40

°C to +85°C

8-pin SOIC

Typical Application

Protected under one or more of the following Micrel patents:

patent #4,951,101; patent #4,914,546

Note: The MIC5013 is ESD sensitive.

Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com