MIC5012

Micrel

5-114

April 1998

General Description

The MIC5012 is the dual 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 14-pin MIC5012 is

extremely easy to use, requiring only a power FET and

nominal supply decoupling to implement either a high- or

low-side switch.

The MIC5012 charges a 1nF load in 60

µs typical. Operation

down to 4.75V allows the MIC5012 to drive standard

MOSFETs in 5V low-side applications by boosting the gate

voltage above the logic supply. In addition, multiple, paral-

leled MOSFETs can be driven by a single MIC5012 for ultra-

high current applications.

Other members of the Micrel driver family include the

MIC5010 full-featured driver, MIC5011 minimum parts count

driver, and MIC5013 protected 8-pin driver.

For new designs, Micrel recommends the pin-compatible

MIC5016 dual MOSFET driver.

Features

• 4.75V to 32V operation

• 2 independent drivers; implements high and low side

drivers

• Less than 1

µA standby current in the “off” state per

channel

• 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

• Minimum external parts count

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

operating on logic supplies

• Independent supply pins for half-bridge applications

Applications

• Lamp drivers

• Motion Control

• Heater switching

• Power bus switching

• Half or full H-bridge drivers

Typical Applications

Ordering Information

Part Number

Temp. Range

Package

MIC5012BN

–40

°C to +85°C

14-pin Plastic DIP

MIC5012BWM

–40

°C to +85°C

16-pin Wide SOIC

Input

Source

Gate

1/2 MIC5012

V+

Gnd

+

10µF

Control Input

#6014

IRF531

14.4V

Figure 1. High Side Driver

ON

OFF

Input

Source

Gate

1/2 MIC5012

V+

Gnd

48V

5V

IRF530

100W

Heater

+

10µF

Control Input

Figure 2. Low Side Driver

ON

OFF

Protected under one or more of the following Micrel patents:

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

Note: The MIC5012 is ESD sensitive.

MIC5012

Dual High- or Low-Side MOSFET Driver

Not Recommended for New Designs