LTC1153_15 Datasheet, PDF (1/16 Pages) Linear Technology – Auto-Reset Electronic Circuit Breaker

FEATURES
s _{Programmable Trip Delay: 15µs to >100ms}
s _{Programmable Trip Current: 1mA to >20A}
s _{Programmbale Auto-Reset Time: 1ms to >10 sec.}
s _{4.5V to 18V Supply Range}
s _{Drives Low RDS(ON) N-Channel MOSFETs}
s _{Status Output Indicates Fault Condition}
s _{Thermal Trip with PTC Thermistor}
s _{8µA IQ in Standby Mode}
s _{No External Charge Pump Capacitors}
s _{Available in 8-Pin SOIC}
APPLICATI S
s _{Power Bus Circuit Breaker}
s _{SCSI Termination Power Protection}
s _{Regulator Over-Current Protection}
s _{Battery Short-Circuit Protection}
s _{DC Motor Stall Protection}
s _{Sensitive System Power Interrupt}
LTC1153
Auto-Reset
Electronic Circuit Breaker
DESCRIPTIO
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.
TYPICAL APPLICATI
5V/1A Electronic Circuit Breaker with 1ms Trip Delay,
200ms Auto-Reset Period and 70°C Thermal Shutdown
ON/OFF
C_T
0.22µF
Z5U
TO µP
51k
5V
IN
VS
C_T
DS
LTC1153
STATUS
G
GND SHUTDOWN
**70°C
PTC
C_D
R_D
0.01µF _100k
*R_SEN
0.1Ω
IRLR024
51k
SENSITIVE
5V LOAD
ALL COMPONENTS SHOWN ARE SURFACE MOUNT.
* IMS026 INTERNATIONAL MANUFACTURING SERVICE, INC. [phone]
** RL2006-100-70-30-PT1 KEYSTONE CARBON COMPANY [phone]
LTC1153 • TA01
Trip Delay Time
10
R_SEN = 0.1Ω
R_D = 100k
C_D = 0.01µF
1
0.1
0.01
1
10
100
CIRCUIT BREAKER CURRENT (A)
LTC1153 • TA02
1