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PDF LTC1154 Data sheet ( Hoja de datos )
| Número de pieza | LTC1154 | |
| Descripción | High-Side Micropower MOSFET Driver | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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FEATURES
n Fully Enhances N-Channel Power MOSFETs
n 8μA IQ Standby Current
n 85μA IQ ON Current
n No External Charge Pump Capacitors
n 4.5V to 18V Supply Range
n Short-Circuit Protection
n Thermal Shutdown via PTC Thermistor
n Status Output Indicates Shutdown
n Available in 8-Pin SOIC and PDIP Packages
APPLICATIONS
n Laptop Computer Power Switching
n SCSI Termination Power Switching
n Cellular Telephone Power Management
n Battery Charging and Management
n High Side Industrial and Automotive Switching
n Stepper Motor and DC Motor Control
LTC1154
High Side Micropower
MOSFET Driver
DESCRIPTION
The LTC®1154 single high side gate driver allows using low
cost N-channel FETs for high side switching applications. An
internal charge pump boosts the gate drive voltage above
the positive rail, fully enhancing an N-channel MOS switch
with no external components. Micropower operation, with
8μA standby current and 85μA operating current, allows
use in virtually all systems with maximum efficiency.
Included on chip is programmable overcurrent sensing.
A time delay can be added to prevent false triggering on
high inrush current loads. An active high shutdown input
is also provided and interfaces directly to a standard PTC
thermistor for thermal shutdown. An open-drain output
is provided to report switch status to the μP. An active
low enable input is provided to control multiple switches
in banks.
The LTC1154 is available in both 8-pin DIP and 8-pin SOIC
packages.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
5V
μP
Ultralow Voltage Drop High Side Switch with
Short-Circuit Protection
51k
IN
VS
EN
LTC1154
STATUS
DS
G
GND SD
0.036Ω*
0.1μF**
200k**
2.7A MAX
IRLR024
5V
LOAD
ALL COMPONENTS SHOWN ARE SURFACE MOUNT.
* IMS026 INTERNATIONAL MANUFACTURING SERVICE, INC. (401) 683-9700
** NOT REQUIRED IF LOAD IS RESISTIVE OR INDUCTIVE.
LTC1154 • TA01
Standby Supply Current
50
45
VIN = 0V
TJ = 25°C
40
35
30
25
20
15
10
5
0
0 5 10 15 20
SUPPLY VOLTAGE (V)
LTC1153 • TA02
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1 page  
TYPICAL PERFORMANCE CHARACTERISTICS
LTC1154
Standby Supply Current
50
45
VIN = 0V
VEN = 0V
40
35
30
25
20
15
VS = 18V
10
5
0
–50 –25
VS = 5V
0 25 50 75 100 125
TEMPERATURE (°C)
LTC1154 • TPC10
Supply Current ON
1000
900
800
VIN = 5V
VEN = 0V
700
600
500
400
300 VS = 12V
200
100 VS = 5V
0
–50 –25
0 25 50 75 100 125
TEMPERATURE (°C)
LTC1154 • TPC11
Input ON Threshold Voltage
2.4
2.2
2.0
1.8
1.6
1.4
VS = 5V
1.2
1.0 VS = 18V
0.8
0.6
0.4
–50 –25
0 25 50 75 100 125
TEMPERATURE (°C)
LTC1154 • TPC12
Shutdown Threshold Voltage
2.4
2.2
2.0
1.8
1.6
1.4
VS = 5V
1.2
1.0 VS = 18V
0.8
0.6
0.4
–50 –25
0 25 50 75 100 125
TEMPERATURE (°C)
LTC1154 • TPC13
ENABLE Threshold Voltage
5.0
4.5 VS = 12V
4.0
3.5
3.0 DISABLE
2.5
2.0
1.5
1.0
0.5
0
–50 –25
ENABLE
0 25 50 75 100 125
TEMPERATURE (°C)
LTC1154 • TPC14
Gate Drive Current
1000
TA = 25°C
100
VS = 18V
VS = 12V
10
1 VS = 5V
0.1
0
4 8 12 16 20
GATE VOLTAGE ABOVE SUPPLY (V)
LTC1154 • TPC15
PIN FUNCTIONS
Input and Shutdown Pins
The LTC1154 input pin is active high and activates all of the
protection and charge pump circuitry when switched ON.
The shutdown pin is designed to immediately disable the
switch if a secondary fault condition (over temperature,
etc.) is detected. The LTC1154 logic and shutdown inputs
are high impedance CMOS gates with ESD protection
diodes to ground and supply and therefore should not be
forced beyond the power supply rails. The shutdown pin
should be connected to ground when not in use.
ENABLE Input Pin
The ENABLE input can be used to enable a number of
LTC1154 high side switches in banks or to provide a sec-
ondary means of control. It can also act as an inverting
input. The ENABLE input is a high impedance CMOS gate
with ESD clamp diodes to ground and supply and therefore
should not be forced beyond the power supply rails. This
pin should be grounded when not in use.
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5 Page 
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
LTC1154
STATUS†
DS
G
+
100μF
IRLZ24
GND SD
30k
*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
LTC1154
STATUS†
DS
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
LTC1154
STATUS†
DS
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
LTC1154
STATUS†
DS
G
GND SD
*KEYSTONE RL2006-100-100-30-PT.
MOUNT ON MOSFET OR LOAD HEAT SINK
+
18V 10μF
200k
MTP12N06
PTC
THERMISTOR
(100°C)*
24V TO 28V
LOAD
LTC1154 • TA06
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11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet LTC1154.PDF ] | |
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