MIC5014/5015

Micrel, Inc.

June 2005

1

MIC5014/5015

Features

• 2.75V to 30V operation

• 100µA maximum supply current (5V supply)

•15µA typical off-state current

• Internal charge pump

• TTL compatible input

•Withstands 60V transient (load dump)

•Reverse battery protected to –20V

• Inductive spike protected to –20V

•Overvoltage shutdown at 35V

• Internal 15V gate protection

•Minimum external parts

•Operates in high-side or low-side configurations

•1µA control input pull-off

• Inverting and noninverting versions

Applications

•Automotive electrical load control

•Battery-powered computer power management

• Lamp control

•Heater control

•Motor control

•Power bus switching

General Description

MIC5014 and MIC5015 MOSFET drivers are designed for

gate control of N-channel, enhancement-mode, power

MOSFETs used as high-side or low-side switches.

The MIC5014/5 can sustain an on-state output indefinitely.

The MIC5014/5 operates from a 2.75V to 30V supply. In high-

side configurations, the driver can control MOSFETs that

switch loads of up to 30V. In low-side configurations, with

separate supplies, the maximum switched voltage is limited

only by the MOSFET.

The MIC5014/5 has a TTL compatible control input.

The MIC5014 is noninverting while the MIC5015 is inverting.

The MIC5014/5 features an internal charge pump that can

sustain a gate voltage greater than the available supply

voltage. The driver is capable of turning on a logic-level

MOSFET from a 2.75V supply or a standard MOSFET from a

5V supply. The gate-to-source output voltage is internally

limited to approximately 15V.

The MIC5014/5 is protected against automotive load dump,

reversed battery, and inductive load spikes of –20V.

The driver’s overvoltage shutdown feature turns off the exter-

nal MOSFET at approximately 35V to protect the load against

power supply excursions.

The MIC5014 is an improved pin-for-pin compatible replace-

ment in many MIC5011 applications.

The MIC5014/5 is available in plastic 8-pin DIP and 8-pin

SOIC pacakges.

MIC5014/5015

Low-Cost High- or Low-Side MOSFET Driver

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

MIC5014

Control Input

OFF

ON

1

2

3

4

8

7

6

5

IRLZ24

+3V to +4V

NC

Gate

Gnd

Source

Input

V+

NC

NC

10µF

Figure 1. 3V “Sleep-Mode” Switch

with a Logic-Level MOSFET

Typical Application