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LTC1153

DESCRIPTIO

S

FEATURE

Auto-Reset

Electronic Circuit Breaker

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Programmable Trip Delay: 15

µs to >100ms

s

Programmable Trip Current: 1mA to >20A

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Programmbale Auto-Reset Time: 1ms to >10 sec.

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4.5V to 18V Supply Range

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Status Output Indicates Fault Condition

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Thermal Trip with PTC Thermistor

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8

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No External Charge Pump Capacitors

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Available in 8-Pin SOIC

The LTC1153 electronic circuit breaker drives a low cost

N-channel MOSFET to interrupt power to a sensitive

electronic load in the event of an over-current condition.

The breaker remains tripped for a period of time set by an

external timing capacitor and then is automatically reset.

This cycle continues until the over-current condition is

removed, protecting both the sensitive load and the

MOSFET switch.

The trip current, trip delay time and auto-reset period are

programmable over a wide range to accommodate a

variety of load impedances. An active high shutdown input

is also provided and interfaces directly to a PTC thermistor

for thermal circuit breaking. An open-drain output is

provided to report breaker status to the

µP.

The LTC1153 is available in both 8-pin DIP and 8-pin SOIC

packages.

S

APPLICATI

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Power Bus Circuit Breaker

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SCSI Termination Power Protection

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Regulator Over-Current Protection

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Battery Short-Circuit Protection

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DC Motor Stall Protection

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Sensitive System Power Interrupt

APPLICATI

TYPICAL

Trip Delay Time

5V/1A Electronic Circuit Breaker with 1ms Trip Delay,

200ms Auto-Reset Period and 70

°C Thermal Shutdown

CIRCUIT BREAKER CURRENT (A)

1

0.01

10

10

100

LTC1153 • TA02

1

0.1

IN

STATUS

GND

VS

DS

G

SHUTDOWN

LTC1153

0.01

µF

100k

0.1

Ω

IRLR024

51k

SENSITIVE

5V LOAD

**70°C

PTC

51k

5V

TO

µP

0.22

µF

ON/OFF

ALL COMPONENTS SHOWN ARE SURFACE MOUNT.

IMS026 INTERNATIONAL MANUFACTURING SERVICE, INC. (401) 683-9700

RL2006-100-70-30-PT1 KEYSTONE CARBON COMPANY (814) 781-1591

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LTC1153 • TA01

Z5U