LTC1153
Auto-Reset
Electronic Circuit Breaker
DESCRIPTIO
FEATURES
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Programmable Trip Delay: 15s to >100ms The LTC1153 electronic circuit breaker drives a low cost
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N-channel MOSFET to interrupt power to a sensitive
Programmable Trip Current: 1mA to >20A
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electronic load in the event of an over-current condition.
Programmbale Auto-Reset Time: 1ms to >10 sec.
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4.5V to 18V Supply Range The breaker remains tripped for a period of time set by an
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external timing capacitor and then is automatically reset.
Drives Low R N-Channel MOSFETs
DS(ON)
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This cycle continues until the over-current condition is
Status Output Indicates Fault Condition
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Thermal Trip with PTC Thermistor removed, protecting both the sensitive load and the
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MOSFET switch.
8A I in Standby Mode
Q
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No External Charge Pump Capacitors
The trip current, trip delay time and auto-reset period are
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Available in 8-Pin SOIC
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
APPLICATI S
for thermal circuit breaking. An open-drain output is
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Power Bus Circuit Breaker
provided to report breaker status to the P.
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SCSI Termination Power Protection
The LTC1153 is available in both 8-pin DIP and 8-pin SOIC
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Regulator Over-Current Protection
packages.
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Battery Short-Circuit Protection
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DC Motor Stall Protection
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Sensitive System Power Interrupt
TYPICAL APPLICATI
5V/1A Electronic Circuit Breaker with 1ms Trip Delay,
200ms Auto-Reset Period and 70C Thermal Shutdown Trip Delay Time
10
ON/OFF IN
VS
R = 0.1
SEN
C
*R
R = 100k
D R
D
D SEN
C
T
0.01F
0.1 C = 0.01F
100k D
0.22F
C
DS
T
Z5U
1
LTC1153
TO P STATUS
G
IRLR024
51k
51k
GND SHUTDOWN
0.1
5V
SENSITIVE
**70C
5V LOAD
PTC
0.01
ALL COMPONENTS SHOWN ARE SURFACE MOUNT.
1 10 100
*
IMS026 INTERNATIONAL MANUFACTURING SERVICE, INC. (401) 683-9700
CIRCUIT BREAKER CURRENT (A)
**
RL2006-100-70-30-PT1 KEYSTONE CARBON COMPANY (814) 781-1591
LTC1153 TA02
LTC1153 TA01
1
TRIP DELAY (ms)
UO
UO
ULTC1153
AB OLUEXAI U RAT GS
S T I
Current (Any Pin).................................................. 50mA
Supply Voltage ........................................................ 22V
Operating Temperature
Input Voltage ..................... (V + 0.3V) to (GND 0.3V)
S
LTC1153C .............................................. 0C to 70C
Timing Capacitor Voltage... (VS + 0.3V) to (GND 0.3V)
Storage Temperature Range ................. 65c to 150C
Gate Voltage ....................... (VS + 24V) to (GND 0.3V)
Lead Temperature (Soldering, 10 sec.)................ 300C
Status Output Voltage.............................................. 15V
PACKAGE/ORDER I FOR ATIO
TOP VIEW ORDER PART TOP VIEW ORDER PART
NUMBER NUMBER
IN
1
V
IN 1
8
V
8
S S
TIMING CAP
2
7
DRAIN SENSE
TIMING CAP
2
7
DRAIN SENSE
LTC1153CS8
LTC1153CN8
STATUS
GATE
3
6
STATUS
3
6
GATE
GND 4 5
SHUTDOWN
GND 4 5 SHUTDOWN
N8 PACKAGE
S8 PACKAGE
8-LEAD PLASTIC DIP 8-LEAD PLASTIC SOIC
LTC1154 PO02
LTC1153 PO01
S8 PART MARKING
T = 100C, = 130C/W (N8) T = 100C, = 150C/W
JMAX JA JMAX JA
1153
ELECTRICAL CHARACTERISTICS V = 4.5V to 18V, T = 25C, C = 0.1F, V = 0V unless otherwise noted.
S A T SD
LTC1153C
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V Supply Voltage l 4.5 18 V
S
I Quiescent Current OFF V = 5V, V = 0V 8 20 A
Q S IN
I Quiescent Current ON V = 5V, V = 5V 85 120 A
Q S IN
IQ Quiescent Current ON VS =12V, VIN = 5V 180 400 A
V Input High Voltage l2V
INH
V Input Low Voltage l 0.8 V
INL
IIN Input Current 0V < VIN < VS l 1 A
C Input Capacitance 5pF
IN
V Timing Capacitor Threshold Voltage V = 5V 2.1 2.5 2.9 V
CT S
V = 12V 2.0 2.6 3.2 V
S
ICT Timing Capacitor Current VS = 12V 3.0 4.2 6.0 A
V Shutdown Input High Voltage l2V
SDH
V Shutdown Input Low Voltage l 0.8 V
SDL
ISD Shutdown Input Current 0V < VIN < VS l 1 A
V Drain Sense Threshold Voltage 80 100 120 mV
SEN
l 75 100 125 mV
I Drain Sense Input Current 0V < V < V l 0.1 A
SEN SEN S
2
U WU
U W W W