LTC1154
O U
W
U
PPLICATI
A
S I FOR ATIO
be added as shown in Figure 8 which holds the supply pin
of the LTC1154 high long enough for the over-current
shutdown circuitry to respond and fully discharge the
gate.
largeoutputcapacitorsonmanyswitchingregulatorsmay
be able to hold the supply pin of the LTC1154 above 3.5V
sufficiently long that this extra filtering is not required.
Because the LTC1154 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 accu-
racy of the 100mV drain sense threshold voltage.
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
U
O
TYPICAL APPLICATI S
High-Side Driver with Over-Voltage Shutdown
High-Side Driver with Thermal Shutdown
6V
4.75V TO 5.25V
5V
5V
+
+
100µF
10µF
IN
V
S
IN
V
S
100Ω
µP OR
CONTROL
LOGIC
µP OR
CONTROL
LOGIC
EN
DS
G
EN
DS
G
LTC1154
LTC1154
5.6V
STATUS†
IRLZ24
STATUS†
IRLD024
30k
GND
SD
GND
SD
6V
LOAD
PTC
THERMISTOR
(100°C)*
5V
LOAD
*RL3006-50-100-25-PT0 KEYSTONE
SWITCH IS SHUTDOWN WHEN V > 5.7V
S
LTC1154 • TA03
LTC1154 • TA05
†A 51k pullup resistor should be connected between Status Output and 5V Logic Supply.
High-Side Driver with Under-Voltage Shutdown
24V to 28V High-Side Switch with Thermal Shutdown
5V
24V TO 28V
+
+
10k
3k
100µF
100µF
1N4148*
+
+
1µF**
5V
5V
18V
10µF
2N2907
IN
V
IN
V
S
S
µP OR
CONTROL
LOGIC
µP OR
CONTROL
LOGIC
EN
DS
G
EN
DS
G
LTC1154
LTC1154
STATUS†
IRLZ24
MTP12N06
STATUS†
200k
GND
SD
GND
SD
PTC
THERMISTOR
(100°C)*
6V
LOAD
24V TO 28V
LOAD
10k
*OPTIONAL IF SUPPLY VOLTAGE LESS THAN 6V.
*KEYSTONE RL2006-100-100-30-PT.
MOUNT ON MOSFET OR LOAD HEAT SINK
**CAPACITOR CHARGED TO SUPPLY VOLTAGE.
SHUTDOWN OCCURS WHEN SUPPLY VOLTAGE
DROPS BY 0.6V.
LTC1154 • TA06
LTC1154 • TA04
11
Linear [ Linear ]
