1

LTC1156

Quad High Side

Micropower MOSFET Driver

with Internal Charge Pump

SUPPLY VOLTAGE (V)

0

0

10

30

40

50

100

70

5

10

LTC1156 G01

20

80

90

60

15

20

Laptop Computer Power Management

Standby Supply Current

5V

0.1

µF

100k

*30m

Ω

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

DS1

DS2

DS3

DS4

IN1

IN2

IN3

IN4

G1

G2

G3

G4

CONTROL

LOGIC

OR

µP

+

10

µF

5V

Si9956DY

Si9956DY

GND GND

LTC1156

FLOPPY DISK

DRIVE

HARD DISK

DRIVE

DISPLAY

PERIPHERAL

APPLICATI

TYPICAL

DESCRIPTIO

S

FEATURE

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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

S

APPLICATI

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 16

µA 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.

s

Laptop Computer Power Switching

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SCSI Termination Power Switching

s

Cellular Telephone Power Management

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P-Channel Switch Replacement

s

Battery Charging and Management

s

Low Frequency H-Bridge Driver

s

Stepper Motor and DC Motor Control