LTC1156_15 Datasheet, PDF (1/8 Pages) Linear Technology – Quad High Side Micropower MOSFET Driver with Internal Charge Pump

FEATURES
s _{No External Charge Pump Components}
s _{Fully Enhances N-Channel Power MOSFETs}
s _{16 Microamps Standby Current}
s _{95 Microamps ON Current}
s _{Wide Power Supply Range 4.5V to 18V}
s _{Controlled Switching ON and OFF Times}
s _{Replaces P-Channel High Side Switches}
s _{Compatible with Standard Logic Families}
s _{Available in 16-pin SOL Package}
APPLICATI S
s _{Laptop Computer Power Switching}
s _{SCSI Termination Power Switching}
s _{Cellular Telephone Power Management}
s _{P-Channel Switch Replacement}
s _{Battery Charging and Management}
s _{Low Frequency H-Bridge Driver}
s _{Stepper Motor and DC Motor Control}
LTC1156
Quad High Side
Micropower MOSFET Driver
with Internal Charge Pump
DESCRIPTIO
The LTC1156 quad 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 opera-
tion, with 16µA standby current and 95µA operating
current, allows use in virtually all systems with maximum
efficiency.
Included on chip is independent over-current sensing to
provide automatic shutdown in case of short circuits. A
time delay can be added to the current sense to prevent
false triggering on high in-rush current loads.
The LTC1156 operates off of a 4.5V to 18V supply and is
well suited for battery-powered applications, particularly
where micropower “sleep” operation is required.
The LTC1156 is available in both 16-pin DIP and 16-pin
SOL packages.
TYPICAL APPLICATI
Laptop Computer Power Management
5V
+
5V
CONTROL
LOGIC
OR µP
10µF
V_S V_{S DS1}
DS2
DS3
DS4
LTC1156
IN1
G1
IN2
G2
IN3
G3
IN4
G4
GND GND
0.1µF
100k
Si9956DY
Si9956DY
ALL COMPONENTS SHOWN ARE SURFACE MOUNT. MINIMUM PARTS COUNT
SHOWN. CURRENT LIMITS CAN BE SET SEPARATELY AND TAILORED TO
INDIVIDUAL LOAD CHARACTERISTICS.
* IMS026 INTERNATIONAL MANUFACTURING SERVICES, INC. [phone]
*30mΩ
HARD DISK
DRIVE
FLOPPY DISK
DRIVE
DISPLAY
PERIPHERAL
1156 TA01
Standby Supply Current
100
90 ^{VIN1 = VIN2 = VIN3 = VIN4 = 0V}
T_J = 25°C
80
70
60
50
40
30
20
10
0
0
5
10
15
20
SUPPLY VOLTAGE (V)
LTC1156 G01
1