1

LTC1623

SMBus Dual High Side

Switch Controller

s

s

Built-In Charge Pumps Drive N-Channel Switches

s

16 Available Switches on the Same Bus

s

s

Available in 8-Lead MSOP and S0 Packages

s

Low Standby Current: 14

µA

s

Eight Addresses from Two Three-State Address Pins

s

Internal Power-On Reset Timer

s

Internal Undervoltage Lockout

s

No Need for External Pull-Up Resistors at Output

s

No Need for Secondary Power Source

s

Computer Peripheral Control

s

Laptop Computer Power Plane Switching

s

Portable Equipment Power Control

s

Industrial Control Systems

s

Handheld Equipment

The LTC

that controls two high-side N-channel MOSFETs on either

input voltage from 2.7V to 5.5V with a low standby current

of 14

µA (at 3.3V). In accordance with the SMBus specifi-

input thresholds throughout the supply voltage range.

Using the 2-wire interface, CLK and DATA, the LTC1623

monitors the bus for a start condition (DATA going from

high to low while CLK is high). Once detected, the LTC1623

compares its address with the first (address) byte sent

over the bus from the master. If matched, the LTC1623 will

execute the second (command) byte from the master and

independently control the built-in charge pumps to drive

two external switches.

The LTC1623 has two three-state programmable address

pins, thus allowing eight different addresses and a total of

sixteen available switches on the same bus.

Gate Drive Voltage

2.7V TO 5.5V

10

µF

(PROGRAMMABLE)

* SILICONIX Si69260Q

Q2

Q1

LOAD2

LOAD1

1623 TA01

(FROM

SMBus)

LTC1623

GND

AD0

AD1

CLK

DATA

GA

GB

*

SUPPLY VOLTAGE (V)

14

12

10

8

6

4

2

0

1623 G01

0

1

23

4

5

6

, LTC and LT are registered trademarks of Linear Technology Corporation.

FEATURES