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PDF LTC1710I Data sheet ( Hoja de datos )
| Número de pieza | LTC1710I | |
| Descripción | SMBus Dual Monolithic High Side Switch | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTC1710
SMBus Dual Monolithic
High Side Switch
FEATURES
s Two 0.4Ω/300mA N-Channel Switches
s Available in MS8 and SO-8 Packages
s SMBus and I2C Compatible
s 0.6V VIL and 1.4V VIH for DATA and CLK
s Low Standby Current: 14µA
s Separate Drain Connection to SW0
s Three Addresses from One Three-State Address Pin
s Independent Control of Up to Six Switches
s Built-In Power-On Reset Timer
s Built-In Undervoltage Lockout
U
APPLICATIONS
s Handheld Computer Power Management
s Computer Peripheral Control
s Laptop Computer Power Plane Switching
s Portable Equipment Power Control
s Industrial Control Systems
s ACPI SMBus Interface
DESCRIPTION
The LTC®1710 SMBus dual switch has two built-in 0.4Ω/
300mA switches that are controlled by a 2-wire SMBus
interface. With a low standby current of 14µA (3.3V), the
LTC1710 operates over an input voltage range of 2.7V to
5.5V while maintaining the SMBus specified 0.6V VIL and
1.4V VIH input thresholds.
Using the 2-wire interface, CLK and DATA, the LTC1710
follows SMBus’s Send Byte Protocol to independently
control the two 0.4Ω internal N-channel power switches,
which are fully enhanced by onboard charge pumps.
The LTC1710 has one three-state programmable
address pin that allows three different addresses for a total
of six available switches on the same bus. The LTC1710
also features a separate user-controlled drain supply
(SW0D) to Switch 0 so that it can be used to control
SMBus peripherials using a different power supply.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATION
VCC
2.7V TO 5.5V
SW0D
0V TO VCC
10µF
81
10µF
FROM SMBus
5
CLOCK
6
DATA
3
AD1
(PROGRAMMABLE)
SW0
CHARGE
PUMP
SW1
LTC1710
4
2
LOAD 1
7
LOAD 2
1710 TA01
Switch Voltage Drop
vs Load Current
500
TA = 25°C
400
300
200
100
0
0
VCC = 2.7V
VCC = 3.3V
VCC = 5V
100 200 300
LOAD CURRENT (mA)
400
1710 TA02
1
1 page  
BLOCK DIAGRA
LTC1710
VCC 8
DATA 6
CLK 5
START
AND
STOP
DETECTORS
INPUT
BUFFERS
SHIFT
REGISTER
COUNTER
VCC
UNDERVOLTAGE
LOCKOUT
POWER-ON
RESET
2V
ACK
LOGIC
A
B
OUTPUT
LATCHES
REGULATED
CHARGE
PUMPS
THERMAL
SHUTDOWN
AD1 3
ADDRESS
DECODER
ADDRESS
COMPARATOR
VCC
7 OUT1
1 SW0D
2 OUT0
GND
4
WU W
TI I G DIAGRA
1710 BD
CLK
tSU:STA
DATA
START
tHD:STA
tHIGH
tSU:DAT
tr
tHD:DAT
tf
tLOW
tSU:STO
STOP
1710 TD
U
OPERATIO
SMBus Operation
SMBus is a serial bus interface that uses only two bus lines,
DATA and CLK, to control low power peripheral devices in
portable equipment. It consists of masters, also known as
hosts, and slave devices. The master of the SMBus is
always the one to initiate communications to the slave
devices by varying the status of the DATA and CLK lines.
The SMBus specification establishes a set of protocols that
devices on the bus must follow for communications.
The protocol that the LTC1710 uses is the Send Byte Pro-
tocol. In this protocol, the master first sends out a Start
signal by switching the DATA line from high to low while
CLK is high. (Because there may be more than one master
on the same bus, an arbitration process takes place if two
masters attempt to take control of the DATA line simulta-
neously; the first master that outputs a one while the other
master is zero loses the arbitration and becomes a slave
itself.) Upon detecting this Start signal, all slave devices on
the bus wake up and prepare to shift in the next byte of data.
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet LTC1710I.PDF ] | |
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