LT1910

1

1910fb

For more information www.linear.com/LT1910

Typical applicaTion

DescripTion

Protected High Side

MOSFET Driver

The LT®1910 is a high side gate driver that allows the use of

lowcostN-channelpowerMOSFETsforhighsideswitching

applications.Itcontainsacompletelyself-containedcharge

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

automotiveapplicationswherepoorsupplyregulationand/

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 Protected High Side Switch

L

, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and

PowerPath and ThinSOT are trademarks of Linear Technology Corporation. All other trademarks

are the property of their respective owners.

FeaTures

applicaTions

n

8V to 48V Power Supply Range

n

Protected from –15V to 60V Supply Transients

n

Short-Circuit Protected

n

Automatic Restart Timer

n

Open-Collector Fault Flag

n

Fully Enhances N-Channel MOSFET Switches

n

Programmable Current Limit, Delay Time and

Autorestart Period

n

Voltage Limited Gate Drive

n

Defaults to Off State with Open Input

n

Available in SO-8 Package

n

Industrial Control

n

Avionics Systems

n

Automotive Switches

n

Stepper Motor and DC Motor Control

n

Electronic Circuit Breaker

Switch Drop vs Load Current

FAULT

IN

TIMER

SENSE

GATE

LT1910

5.1k

24V

5V

FAULT OUTPUT

OFF ON

GND

IRFZ34

1910 TA01

10µF

50V

0.1µF

0.01

LOAD

+

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