Linear Technology LTC1710 Datasheet

FEATURES

■

Two 0.4Ω/300mA N-Channel Switches

■

Available in MS8 and SO-8 Packages

■

SMBus and I2C Compatible

■

0.6V VIL and 1.4V VIH for DATA and CLK

■

Low Standby Current: 14µA

■

Separate Drain Connection to SW0

■

Three Addresses from One Three-State Address Pin

■

Independent Control of Up to Six Switches

■

Built-In Power-On Reset Timer

■

Built-In Undervoltage Lockout

LTC1710

SMBus Dual Monolithic

High Side Switch

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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 14µ A (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.

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APPLICATIONS

■

Handheld Computer Power Management

■

Computer Peripheral Control

■

Laptop Computer Power Plane Switching

■

Portable Equipment Power Control

■

Industrial Control Systems

■

ACPI SMBus Interface

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TYPICAL APPLICATION

V

CC

2.7V TO 5.5V

81

SW0

5

CLOCK

FROM SMBus

(PROGRAMMABLE)

DATA

AD1

CHARGE

6

PUMP

3

SW1

LTC1710

SW0D
0V TO V

4

CC

2

7

10µF10µF

LOAD 1

LOAD 2

1710 TA01

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.

Switch Voltage Drop

vs Load Current

500

T

= 25°C

A

400

300

200

100

SWITCH VOLTAGE DROP (mV)

0

100

0

LOAD CURRENT (mA)

200

VCC = 2.7V

V

CC

= 5V

V

CC

300

= 3.3V

400

1710 TA02

1

LTC1710

WW

W

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ABSOLUTE MAXIMUM RATINGS

(Voltages Referred to GND Pin) (Note 1)

Input Supply Voltage (VCC).......................... –0.3V to 6V

Input Supply Voltage (VCC) with SW0 Connected

as a Low Side Switch ........................... – 0.3V to 3.6V

DATA, CLK (Bus Pins 6, 5)......................... –0.3V to 6V*

AD1 ( Address Pin 3) ....................... –0.3V to VCC + 0.3V

OUT0, OUT1 (Output Pins 2, 7) ................... – 0.3V to 6V

SW0D (Switch 0 Drain Pin 1)....................... –0.3V to 6V

OUT0, OUT1 (Output Pins 2, 7)

Continuous .................................................... 300mA

Pulsed, <10µ s (nonrepetitive) ............................... 1A

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W

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PACKAGE/ORDER INFORMATION

ORDER PART

TOP VIEW

SW0D

1

OUT0

2

AD1

3

GND

4

MS8 PACKAGE

8-LEAD PLASTIC MSOP

T

= 110°C, θJA = 150°C/W

JMAX

8
7
6
5

V

CC

OUT1
DATA
CLK



NUMBER

LTC1710CMS8

MS8 PART MARKING

LTDZ

Operating Temperature Range

LTC1710C................................................ 0°C to 70°C

LTC1710I ............................................ – 40°C to 85°C

Junction Temperature** ...................................... 125°C

Storage Temperature Range .................. –65°C to 150°C

Lead Temperature (Soldering, 10 sec)................... 300°C

*Supply rails to DATA and CLK are independent of VCC to LTC1710.
**Although the LTC1710 can sustain T

circuitry is set to shut down the switches at T

TOP VIEW

SW0D

1

OUT0

2

AD1

3

GND

4

= 125°C without damage, its internal protection

JMAX

= 120°C with 15°C hysteresis.

J

ORDER PART

NUMBER

V

8

CC

OUT1

7

DATA

6

CLK

5

LTC1710CS8
LTC1710IS8

S8 PART MARKING

S8 PACKAGE

8-LEAD PLASTIC SO

T

= 110°C, θJA = 110°C/W

JMAX

1710
1710I

Consult factory for Military grade parts.

ELECTRICAL CHARACTERISTICS

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

V

CC

I

VCC

R

DS(ON)

V

UVLO

t

POR

f

OSC

Operating Supply Voltage Range ● 2.7 5.5 V
Supply Current Charge Pump Off, AD1 High or Low,

DATA and CLK High
V

CC

V

CC

V

CC

OUT0 or OUT1 High
(Command Byte XXXXXX01 or XXXXXX10) ● 200 300 µA
Both Outputs High (Command Byte XXXXXX11)

Power Switch On Resistance VCC = 2.7V, I

= 3.3V, I

V

CC

= 5V, I

V

CC

Undervoltage Lockout Falling Edge (Note 2) ● 1.5 2.0 2.5 V
Power-On Reset Delay Time VCC = 2.7V (Note 3) 300 1000 µs

= 5.5V 300 1000 µs

V

CC

Charge Pump Oscillator Frequency 300 kHz
(Note 3)

TA = 25°C, VCC = SW0D = 5V unless otherwise noted.

= 5V ● 17 30 µA
= 3.3V ● 14 30 µA
= 2.7V ● 11 30 µA

● 250 500 µA

= 300mA 0.55 Ω

OUT

= 300mA 0.46 0.7 Ω

OUT

= 300mA 0.40 0.6 Ω

OUT

2

LTC1710

ELECTRICAL CHARACTERISTICS

TA = 25°C, VCC = SW0D = 5V unless otherwise noted.

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

t

t

V

V

V
C
I

ON

OFF

IL

IH

OL

IN

IN

Output Turn-On Time VCC = 2.7V (From ON (Note 6) to V
(100Ω/1µF Load) V

= 5.5V (From ON (Note 6) to V

CC

Output Turn-Off Time VCC = 2.7V (From OFF (Note 7) to V
(100Ω/1µF Load) V

= 5.5V (From OFF (Note 7) to V

CC

= 90% VCC) 200 µs

OUT

= 90% VCC) 160 µs

OUT

= 10% VCC) 250 µs

OUT

= 10% VCC) 250 µs

OUT

DATA/CLK Input Low Voltage VCC = 2.7V to 5.5V ● 0.6 V
AD1 Input Low Voltage V

= 2.7V to 5.5V ● 0.2 V

CC

DATA/CLK High Voltage VCC = 2.7V to 5.5V ● 1.4 V
AD1 Input High Voltage V

Data Output Low Voltage VCC = 2.7V to 5.5V, I

= 2.7V to 5.5V ● VCC – 0.2 V

CC

= 350µA ● 0.18 0.4 V

PULL-UP

Input Capacitance (DATA, CLK, AD1) 5 pF
Input Leakage Current (DATA, CLK) ● ±1 µA
Input Leakage Current (AD1) ● ±250 nA

SMBus Related Specifications (Note 5)

f

SMB

t

BUF

SMBus Operating Frequency 10 100 kHz
Bus Free Time Between 4.7 µs

Stop and Start

t

SU:STA

t

HD:STA

t

SU:STO

t

HD: DAT

t

SU:DAT

t

LOW

t

HIGH

t

f

t

r

I

PULL-UP

Start Condition Setup Time 4.7 µs
Start Condition Hold Time 4.0 µs
Stop Condition Setup Time 4.0 µs
Data Hold Time 300 ns
Data Setup Time 250 ns
Clock Low Period 4.7 µs
Clock High Period 4.0 50 µs
Clock/Data Fall Time 300 ns
Clock/Data Rise Time 1000 ns
Current Through External Pull-Up VCC = 2.7V to 5.5V 100 350 µA

Resistor on DATA Pin (Open-Drain Data Pull-Down Current Capacity)

The ● denotes specifications which apply over the full operating
temperature range.

Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.

Note 2: Approximately 3% hysteresis is provided to ensure stable operation
and eliminate false triggering by minor V

Note 3: Measured from V

CC

> V

UVLO

glitches.

CC

to SMBus ready for DATA input.

Note 4: The oscillator frequency is not tested directly but is inferred from
turn-on time.

Note 5: SMBus timing specifications are guaranteed but not tested.
Note 6: ON is enabled upon receiving the Stop condition from the SMBus

master.
Note 7: OFF is enabled upon receiving the Stop condition from the SMBus

master.

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