July 2005

1

MIC5011

MIC5011

Micrel, Inc.

MIC5011

Minimum Parts High- or Low-Side MOSFET Driver

General Description

The MIC5011 is the “minimum parts count” member of the

Micrel MIC501X driver family. These ICs are designed to

drive the gate of an N-channel power MOSFET above the

supply rail in high-side power switch applications. The 8-pin

MIC5011 is extremely easy to use, requiring only a power

FET and nominal supply decoupling to implement either a

high- or low-side switch.

The MIC5011 charges a 1nF load in 60µs typical with no

external components. Faster switching is achieved by add-

ing two 1nF charge pump capacitors. Operation down to

4.75V allows the MIC5011 to drive standard MOSFETs in

5V low-side applications by boosting the gate voltage above

the logic supply. In addition, multiple paralleled MOSFETs

can be driven by a single MIC5011 for ultra-high current

applications.

Other members of the Micrel driver family include the

MIC5013 protected 8-pin driver.

For new designs, Micrel recommends the pin-compatible

MIC5014 MOSFET driver.

Features

• 4.75V to 32V operation

• Less than 1µA standby current in the “off” state

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

power FET above supply

• Available in small outline SOIC packages

• Internal zener clamp for gate protection

• Minimum external parts count

• Can be used to boost drive to low-side power FETs

operating on logic supplies

• 25µs typical turn-on time with optional external

capacitors

• Implements high- or low-side drivers

Applications

• Lamp drivers

• Relay and solenoid drivers

• Heater switching

• Power bus switching

Typical Applications

Ordering Information

Part Number

Temperature

Range

Package

Standard

Pb-Free

MIC5011BN MIC5011YN –40ºC to +85ºC

8-pin Plastic

DIP

MIC5011BM MIC5011YM –40ºC to +85ºC

8-pin SOIC

Input

Source

Gate

1

2

3

4

8

MIC5011

7

6

5

V+

Gnd

C1

Com

C2

48V

5V

IRF530

100W

Heater

+

10µF

Control Input

ON

OFF

Protected under one or more of the following Micrel patents:

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

Note: The MIC5011 is ESD sensitive.

Input

Source

Gate

1

2

3

4

8

MIC5011

7

6

5

V+

Gnd

C1

Com

C2

+

10µF

Control Input

#6014

IRF531

14.4V

ON

OFF

Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

Figure 1. High Side Driver

Figure 2. Low Side Driver