LTC1154 Linear Technology, LTC1154 Datasheet - Page 11

• Manufacturer Part Number: LTC1154
• Description: High-Side Micropower MOSFET Driver
• Manufacturer: Linear Technology

A
†
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.
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
TYPICAL
A 51k pullup resistor should be connected between Status Output and 5V Logic Supply.
**
CONTROL
*
OPTIONAL IF SUPPLY VOLTAGE LESS THAN 6V.
CAPACITOR CHARGED TO SUPPLY VOLTAGE.
SHUTDOWN OCCURS WHEN SUPPLY VOLTAGE
DROPS BY 0.6V.
PPLICATI
LOGIC
P OR
CONTROL
5V
*RL3006-50-100-25-PT0 KEYSTONE
LOGIC
P OR
5V
High-Side Driver with Under-Voltage Shutdown
High-Side Driver with Thermal Shutdown
5V
IN
EN
STATUS
GND
A
IN
EN
STATUS
GND
O
PPLICATI
LTC1154
†
+
U
LTC1154
†
S
100 F
I FOR ATIO
DS
SD
V
G
S
U
DS
SD
V
6V
G
S
O
1N4148*
U
PTC
THERMISTOR
(100°C)*
W
S
2N2907
+
30k
10k
10k
+
100 F
1 F**
LOAD
U
6V
LOAD
IRLZ24
LTC1154 • TA03
6V
IRLZ24
LTC1154 • TA04
large output capacitors on many switching regulators may
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.
*KEYSTONE RL2006-100-100-30-PT.
MOUNT ON MOSFET OR LOAD HEAT SINK
CONTROL
LOGIC
SWITCH IS SHUTDOWN WHEN V
CONTROL
P OR
5V
LOGIC
P OR
5V
24V to 28V High-Side Switch with Thermal Shutdown
24V TO 28V
High-Side Driver with Over-Voltage Shutdown
IN
EN
STATUS
GND
IN
EN
STATUS
GND
LTC1154
+
†
4.75V TO 5.25V
LTC1154
†
100 F
S
> 5.7V
DS
SD
V
G
S
DS
SD
V
G
S
3k
PTC
THERMISTOR
(100°C)*
100
5.6V
18V
200k
+
+
LTC1154
10 F
10 F
24V TO 28V
LOAD
5V
LOAD
IRLD024
LTC1154 • TA05
11
MTP12N06
LTC1154 • TA06