LTC1154 查看數據表（PDF） - Linear Technology
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LTC1154 Datasheet PDF : 18 Pages
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LTC1154
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 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 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 accuracy
of the 100mV drain sense threshold voltage.
TYPICAL APPLICATIONS
High Side Driver with Thermal Shutdown
5V
μP OR
CONTROL
LOGIC
6V
IN
VS
EN
DS
LTC1154
STATUS†
G
+
100μF
IRLZ24
30k
GND
SD
*RL3006-50-100-25-PT0 KEYSTONE
PTC
6V
THERMISTOR LOAD
(100°C)*
LTC1154 • TA03
†A 51k pullup resistor should be connected between Status Output and 5V Logic Supply.
High Side Driver with Overvoltage Shutdown
5V
μP OR
CONTROL
LOGIC
4.75V TO 5.25V
IN
VS
EN
DS
LTC1154
STATUS†
G
+
10μF
100Ω
5.6V
IRLD024
GND
SD
SWITCH IS SHUTDOWN WHEN VS > 5.7V
5V
LOAD
LTC1154 • TA05
High Side Driver with Undervoltage Shutdown
5V
+
100μF
10k
1N4148*
+
5V
1μF**
μP OR
CONTROL
LOGIC
IN
VS
EN
DS
LTC1154
STATUS†
G
2N2907
IRLZ24
GND
SD
*OPTIONAL IF SUPPLY VOLTAGE LESS THAN 6V.
**CAPACITOR CHARGED TO SUPPLY VOLTAGE.
SHUTDOWN OCCURS WHEN SUPPLY VOLTAGE
DROPS BY 0.6V.
6V
10k
LOAD
LTC1154 • TA04
24V to 28V High Side Switch with Thermal Shutdown
24V TO 28V
+
100μF
3k
5V
μP OR
CONTROL
LOGIC
IN
VS
EN
DS
LTC1154
STATUS†
G
GND
SD
* KEYSTONE RL2006-100-100-30-PT.
MOUNT ON MOSFET OR LOAD HEAT SINK
+
18V
10μF
MTP12N06
200k
PTC
THERMISTOR
(100°C)*
24V TO 28V
LOAD
LTC1154 • TA06
1154fb
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