LTC1623_15 Datasheet, PDF (1/12 Pages) Linear Technology – SMBus Dual High Side Switch Controller

LTC1623
SMBus Dual High Side
Switch Controller
FEATURES
s _{SMBus and I}²_{C Compatible}
s _{Built-In Charge Pumps Drive N-Channel Switches}
s _{16 Available Switches on the Same Bus}
s _{0.6V VIL and 1.4V VIH for DATA and CLK}
s _{Available in 8-Lead MSOP and S0 Packages}
s _{Low Standby Current: 14µA}
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}
U
APPLICATIONS
s _{Computer Peripheral Control}
s _{Laptop Computer Power Plane Switching}
s _{Portable Equipment Power Control}
s _{Industrial Control Systems}
s _{Handheld Equipment}
DESCRIPTION
The LTC^®1623 SMBus switch controller is a slave device
that controls two high-side N-channel MOSFETs on either
the SMBus or the I²C bus. The LTC1623 operates with an
input voltage from 2.7V to 5.5V with a low standby current
of 14µA (at 3.3V). In accordance with the SMBus specifi-
cation, the LTC1623 maintains the 0.6V V_IL and 1.4V V_IH
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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATION
(FROM
SMBus)
10µF
(PROGRAMMABLE)
* SILICONIX Si69260Q
V_CC
2.7V TO 5.5V
V_CC
CLK
GA
DATA
GB
LTC1623
AD0
AD1
GND
Q1
LOAD1
*
Q2
LOAD2
1623 TA01
Gate Drive Voltage
14
T_J = 25°C
12
10
8
6
4
2
0
012
3
4
56
SUPPLY VOLTAGE (V)
1623 G01
1