1

LT1910

sn1910 1910fs

Protected High Side

MOSFET Driver

s

8V to 48V Power Supply Range

s

Protected from –15V to 60V Supply Transients

s

Short-Circuit Protected

s

Automatic Restart Timer

s

Open-Collector Fault Flag

s

Fully Enhances N-Channel MOSFET Switches

s

Programmable Current Limit, Delay Time and

Autorestart Period

s

Voltage Limited Gate Drive

s

Defaults to OFF State with Open Input

s

Available in SO-8 Package

s

Industrial Control

s

Avionics Systems

s

Automotive Switches

s

Stepper Motor and DC Motor Control

s

Electronic Circuit Breaker

, LTC and LT are registered trademarks of Linear Technology Corporation.

The LT

of low cost N-channel power MOSFETs for high side

switching applications. It contains a completely self-con-

tained charge pump to fully enhance an N-channel MOSFET

switch with no external components.

When the internal drain comparator senses that the switch

current has exceeded the preset level, the switch is turned

off and a fault flag is asserted. The switch remains off for

a period of time set by an external timing capacitor and

then automatically attempts to restart. If the fault still

exists, this cycle repeats until the fault is removed, thus

protecting the MOSFET. The fault flag becomes inactive

once the switch restarts successfully.

The LT1910 has been specifically designed for harsh

operating environments such as industrial, avionics and

automotive applications where poor supply regulation

and/or transients may be present. The device will not

sustain damage from supply transients of –15V to 60V.

The LT1910 is available in the SO-8 package.

FAULT

IN

TIMER

SENSE

GATE

LT1910

5.1k

3

4

2

8

6

5

1

24V

5V

FAULT OUTPUT

OFF ON

GND

IRFZ34

1910 TA01

10

µF

50V

0.1

µF

0.01

Ω

LOAD

+

Fault Protected High Side Switch

LOAD CURRENT (A)

0

0.30

0.40

0.50

4

1910 TA02

0.20

0.10

0.25

0.35

0.45

0.15

0.05

0

1

2

3

5

Switch Drop vs Load Current

DESCRIPTIO

FEATURES

APPLICATIO S

TYPICAL APPLICATIO