LTC1153
Auto-Reset
Electronic Circuit Breaker
FEATURES
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DESCRIPTIO
Programmable Trip Delay: 15碌s to >100ms
Programmable Trip Current: 1mA to >20A
Programmbale Auto-Reset Time: 1ms to >10 sec.
4.5V to 18V Supply Range
Drives Low R
DS(ON)
N-Channel MOSFETs
Status Output Indicates Fault Condition
Thermal Trip with PTC Thermistor
8碌A I
Q
in Standby Mode
No External Charge Pump Capacitors
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
碌P.
The LTC1153 is available in both 8-pin DIP and 8-pin SOIC
packages.
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
TYPICAL APPLICATI
5V/1A Electronic Circuit Breaker with 1ms Trip Delay,
200ms Auto-Reset Period and 70擄C Thermal Shutdown
10
ON/OFF
C
T
0.22碌F
Z5U
TO
碌P
51k
GND
5V
**70擄C
PTC
SENSITIVE
5V LOAD
SHUTDOWN
IN
C
T
LTC1153
STATUS
G
51k
IRLR024
VS
C
D
R
D
0.01碌F 100k
DS
TRIP DELAY (ms)
*R
SEN
0.1鈩?/div>
1
0.1
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
LTC1153 鈥?TA01
0.01
1
10
CIRCUIT BREAKER CURRENT (A)
100
U
Trip Delay Time
R
SEN
= 0.1鈩?/div>
R
D
= 100k
C
D
= 0.01碌F
LTC1153 鈥?TA02
UO
UO
1
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