Datasheet

11
LTC1153
U
S
A
O
PP
L
IC
AT
I
WU
U
I FOR ATIO
Five volt linear regulators with small output capacitors
are the most difficult to protect as they can “switch”
from a voltage mode to a current limited mode very
quickly. The large output capacitors on many switching
regulators, on the other hand, may be able to hold the
supply pin of the LTC1153 above 3.5V sufficiently long
that this extra filtering is not required.
TYPICAL APPLICATIO S
U
Over-Temperature Circuit Breaker
24V to 28V Over-Temperature Circuit Breaker
Over-Voltage Circuit Breaker
24V to 28V Over-Temperature Circuit Breaker
with Bootstrapped Supply
IN
C
T

STATUS
GND
V
S

DS
G
SD
LTC1153
0.47µF

+
100µF
MTD3055E
12V
LTC1153 • TA03
12V
LOAD
51k
*RL3006-50-100-25-PT0 KEYSTONE
30k
5V
*PTC
THERMISTOR
(100°C)
5V
Because the LTC1153 is micropower in both the standby
and ON state, the voltage drop across the supply filter
is less than 2mV, and does not significantly alter the
accuracy of the 100mV drain sense threshold voltage.
IN
C
T

STATUS
GND
V
S

DS
G
SD
LTC1153
0.22µF

+
10µF
IRLD024
4.75V TO 5.25V
LTC1153 • TA05
5V
LOAD
51k
5V
100Ω
SWITCH IS SHUTDOWN WHEN V
S
> 5.7V
5.6V
IN
C
T

STATUS
GND
V
S

DS
G
SD
LTC1153
0.47µF

+
100µF
MTP15N06E
24V TO 28V
LTC1153 • TA06
24V TO 28V
LOAD
5V
5V
30k
+
10µF
18V
100k
*PTC
THERMISTOR
(100°C)
6.2k
1N4148
KEYSTONE RL2006-100-100-30-PT.
MOUNT ON MOSFET OR LOAD HEAT SINK.
BOOTSTRAPPING REDUCES I
Q(OFF)
TO 60µA, I
Q(ON)
= 1mA.
*

**
51k
IN
C
T

STATUS
GND
V
S

DS
G
SD
LTC1153
0.47µF

+
100µF
MTP12N06
24V TO 28V
LTC1153 • TA04
24V TO 28V
LOAD
51k
5V
5V
30k
*KEYSTONE RL2006-100-100-30-PT.
MOUNT ON MOSFET OR LOAD HEAT SINK.
+
10µF
18V
3k
*PTC
THERMISTOR
(100°C)