1
LTC1156
Quad High Side
Micropower MOSFET Driver
with Internal Charge Pump
SUPPLY VOLTAGE (V)
0
0
SUPPLY CURRENT (µA)
10
30
40
50
100
70
5
10
LTC1156 G01
20
80
90
60
15
20
V
IN1
= V
IN2
= V
IN3
= V
IN4
= 0V
T
J
= 25°C
Laptop Computer Power Management
Standby Supply Current
5V
0.1µF
100k
*30mΩ
1156 TA01
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. (401) 683-9700
V
S
V
S
DS1
DS2
DS3
DS4
IN1
IN2
IN3
IN4
G1
G2
G3
G4
CONTROL
LOGIC
OR µP
+
10µF
5V
Si9956DY
Si9956DY
GND
GND
LTC1156
FLOPPY DISK
DRIVE
HARD DISK
DRIVE
DISPLAY
PERIPHERAL
U
A
O
PP
L
IC
AT
ITY
P
I
CA
L
D
U
ESCRIPTIO
S
F
EA
T
U
RE
■
No External Charge Pump Components
■
Fully Enhances N-Channel Power MOSFETs
■
16 Microamps Standby Current
■
95 Microamps ON Current
■
Wide Power Supply Range 4.5V to 18V
■
Controlled Switching ON and OFF Times
■
Replaces P-Channel High Side Switches
■
Compatible with Standard Logic Families
■
Available in 16-pin SOL Package
U
S
A
O
PP
L
IC
AT
I
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.
■
Laptop Computer Power Switching
■
SCSI Termination Power Switching
■
Cellular Telephone Power Management
■
P-Channel Switch Replacement
■
Battery Charging and Management
■
Low Frequency H-Bridge Driver
■
Stepper Motor and DC Motor Control