LTC1153
Auto-Reset
Electronic Circuit Breaker
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DESCRIPTIO
FEATURES
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Programmable Trip Delay: 15µs to >100ms
Programmable Trip Current: 1mA to >20A
Programmbale Auto-Reset Time: 1ms to >10 sec.
4.5V to 18V Supply Range
Drives Low RDS(ON) N-Channel MOSFETs
Status Output Indicates Fault Condition
Thermal Trip with PTC Thermistor
8µA IQ in Standby Mode
No External Charge Pump Capacitors
Available in 8-Pin SOIC
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APPLICATI
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Power Bus Circuit Breaker
SCSI Termination Power Protection
Regulator Over-Current Protection
Battery Short-Circuit Protection
DC Motor Stall Protection
Sensitive System Power Interrupt
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.
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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.
TYPICAL APPLICATI
5V/1A Electronic Circuit Breaker with 1ms Trip Delay,
200ms Auto-Reset Period and 70°C Thermal Shutdown
Trip Delay Time
10
IN
CT
0.22µF
Z5U
CD
RD
0.01µF 100k
CT
*RSEN
0.1Ω
DS
LTC1153
TO µP
STATUS
IRLR024
G
51k
51k
GND
RSEN = 0.1Ω
RD = 100k
CD = 0.01µF
VS
SHUTDOWN
5V
**70°C
PTC
TRIP DELAY (ms)
ON/OFF
1
0.1
SENSITIVE
5V LOAD
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
0.01
1
10
CIRCUIT BREAKER CURRENT (A)
100
LTC1153 • TA02
LTC1153 • TA01
1
