Datasheet

LTC1154
11
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TYPICAL APPLICATIONS
APPLICATIONS INFORMATION
added as shown in Figure 8 which holds the supply pin of
the LTC1154 high long enough for the overcurrent shutdown
circuitry to respond and fully discharge the gate.
Five volt linear regulators with small output capacitors are
the most diffi cult 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 may
be able to hold the supply pin of the LTC1154 above 3.5V
suffi ciently long that this extra fi ltering is not required.
Because the LTC1154 is micropower in both the standby
and ON state, the voltage drop across the supply fi lter is
less than 2mV, and does not signifi cantly alter the accuracy
of the 100mV drain sense threshold voltage.
IN
EN
STATUS
†
GND
V
S
DS
G
SD
LTC1154
+
100μF
IRLZ24
6V
LTC1154 • TA03
6V
LOAD
5V
*RL3006-50-100-25-PT0 KEYSTONE
30k
PTC
THERMISTOR
(100°C)*
μP OR
CONTROL
LOGIC
IN
EN
STATUS
†
GND
V
S
DS
G
SD
LTC1154
IRLZ24
5V
LTC1154 • TA04
6V
LOAD
5V
μP OR
CONTROL
LOGIC
1μF**
+
100μF
10k
1N4148*
2N2907
10k
OPTIONAL IF SUPPLY VOLTAGE LESS THAN 6V.
CAPACITOR CHARGED TO SUPPLY VOLTAGE.
SHUTDOWN OCCURS WHEN SUPPLY VOLTAGE
DROPS BY 0.6V.
*
**
+
IN
EN
STATUS
†
GND
V
S
DS
G
SD
LTC1154
+
10μF
IRLD024
4.75V TO 5.25V
LTC1154 • TA05
5V
LOAD
5V
SWITCH IS SHUTDOWN WHEN V
S
> 5.7V
μP OR
CONTROL
LOGIC
100Ω
5.6V
IN
EN
STATUS
†
GND
V
S
DS
G
SD
LTC1154
MTP12N06
24V TO 28V
LTC1154 • TA06
24V TO 28V
LOAD
5V
* KEYSTONE RL2006-100-100-30-PT.
MOUNT ON MOSFET OR LOAD HEAT SINK
μP OR
CONTROL
LOGIC
10μF
+
100μF
3k
18V
PTC
THERMISTOR
(100°C)*
200k
+
High Side Driver with Thermal Shutdown High Side Driver with Overvoltage Shutdown
High Side Driver with Undervoltage Shutdown 24V to 28V High Side Switch with Thermal Shutdown
†
A 51k pullup resistor should be connected between Status Output and 5V Logic Supply.