LTC1154_11 Datasheet, PDF (1/18 Pages) Linear Technology – High Side Micropower MOSFET Driver Fully Enhances N-Channel Power MOSFETs

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
V_S
EN
DS
LTC1154
STATUS
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. [phone]
** NOT REQUIRED IF LOAD IS RESISTIVE OR INDUCTIVE.
LTC1154 • TA01
Standby Supply Current
50
45
V_IN = 0V
T_J = 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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