SC1543 [SEMTECH]

400mA/200mA Dual 3.3V Smart Power Switch; 400毫安/ 200mA可双路3.3V智能电源开关


型号：	SC1543
厂家：	SEMTECH CORPORATION
描述：	400mA/200mA Dual 3.3V Smart Power Switch 400毫安/ 200mA可双路3.3V智能电源开关驱动程序和接口开关接口集成电路电源开关
文件：	总5页 (文件大小：59K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

400mA/200mA Dual 3.3V Smart

Power Switch

SC1543

PRELIMINARY - October 9, 2000

TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com

DESCRIPTION

FEATURES

•= ^{Glitch free transitions between inputs}

•= Internal logic selects appropriate input

•= 400mA load current capability from main input

•= Low power shutdown mode

The SC1543 provides a glitch free 3.3V output when

one of two 3.3V input sources is present. It does not

require external logic to sequence from one input

source to the other. Whenever VIN1 exceeds a

predetermined threshold value the internal MOSFET

connects it’s source voltage to the output. If the input at

VIN1 is below the threshold another internal MOSFET

connects VIN2 to the output. If both inputs are at 3.3V

then VIN1 will be connected to the output.

•= Industrial temperature range

APPLICATIONS

•= Mini PCI cards

•= Peripheral cards

•= Instantly available personal computers (IAPCs)

The SC1543 is designed to provide 400mA from the

main input (VIN1) and 200mA from the secondary input

(VIN2). A very low quiescent current of 10µA in

shutdown mode reduces power dissipation.

ORDERING INFORMATION

Part Number⁽¹⁾

SC1543IMSTR

Note:

(1) Only available in tape and reel packaging. A reel

contains 2500 devices.

Package

The internal logic and control circuit detects the voltage

levels of VIN1 and VIN2, and compares them to an

input reference voltage of 2.9V. An internally controlled

period of switch overlap ensures that the transition

between supplies is as glitch-free as possible.

MSOP-8

The SC1543 is available in an MSOP-8 surface mount

package.

APPLICATION CIRCUIT

SHUTDOWN

VIN1 SHDN

3.3V IN

3.3V OUT

VIN1

VIN2

VOUT

GND

3.3VAUX IN

VIN2

SC1543

CIN1

1uF

CIN2

1uF

COUT

10uF

652 MITCHELL ROAD NEWBURY PARK CA 91320

400mA/200mA Dual 3.3V Smart

Power Switch

SC1543

PRELIMINARY - October 9, 2000

ABSOLUTE MAXIMUM RATINGS

Parameter

Symbol

Maximum

Units

Input Supply Voltage

VIN1,2

-0.5 to +6

Output Current From:

VIN1

VIN2

I_O

400

200

Operating Ambient Temperature Range

Operating Junction Temperature Range

Storage Temperature Range

T_A

T_J

-40 to +85

-40 to +125

-65 to +150

300

°C

T_STG

T_LEAD

θ_JA

°C

Lead Temperature (Soldering, 10 Sec.)

Thermal Impedance Junction to Ambient

°C

206

°C/W

ELECTRICAL CHARACTERISTICS⁽¹⁾

Unless specified, T_A= 25°C, SHDN = 0V, C_O= 10µF, I_O= 400mA (when power is being supplied from VIN1, 200mA when power is being sup-

plied from VIN2). Values in bold apply over full operating temperature range.

Parameter

Symbol

Conditions

Min Typ Max Units

VIN1

Supply Voltage

Quiescent Current

VIN1

I_Q1

3.3

150

3.0

3.6

300

VIN1 > VIN2, I_O= 0mA

VIN1 < VIN2

µA

VIN1 = SHDN = 3.3V

Reverse Leakage From VIN2⁽²⁾

VIN2

I_VIN1

VIN1 = 0V, VIN2 = 3.6V, I_O= 0mA

0.25

µA

1.00

Supply Voltage

VIN2

I_Q2

3.3

150

3.0

3.6

300

Quiescent Current

VIN2 > VIN1, I_O= 0mA

VIN2 < VIN1

µA

VIN2 = SHDN = 3.3V

Reverse Leakage From VIN1⁽²⁾

VIN1 Threshold Voltage

Threshold Voltage

I_VIN2

VIN1 = 3.6V, VIN2 = 0V, I_O= 0mA

0.25

µA

1.00

V_TH

2.90

130

2.80

3.00

Hysteresis

V_HYST

Power Switches

(2)

VIN1 Pass Device R_DS(ON)

R_DS(ON)1

R_DS(ON)2

VIN1 = 3.3V, VIN2 = 0V

VIN1 = 0V, VIN2 = 3.3V

100

150

250

400

mΩ

(2)

VIN2 Pass Device R_DS(ON)

652 MITCHELL ROAD NEWBURY PARK CA 91320

400mA/200mA Dual 3.3V Smart

Power Switch

SC1543

PRELIMINARY - October 9, 2000

ELECTRICAL CHARACTERISTICS⁽¹⁾(Cont.)

Unless specified, T_A= 25°C, SHDN = 0V, C_O= 10µF, I_O= 400mA (when power is being supplied from VIN1, 200mA when power is being sup-

plied from VIN2). Values in bold apply over full operating temperature range.

Parameter

Symbol

Conditions

Min Typ Max Units

SHDN

Input High Voltage

Input Low Voltage

Over Temperature Protection

High Trip Level

Hysteresis

V_IH

V_IL

1.8

0.4

T_HI

165

°C

T_HYS

NOTES:

(1) This device is ESD sensitive. Use of standard ESD handling precautions is required.

(2) Guaranteed by design.

OUTPUT TRUTH TABLE

Input Conditions⁽¹⁾

VOUT

VIN1 > V_TH

Connected to VIN1

VIN1 < V_TH

Connected to greater of VIN1 and VIN2

NOTES:

(1) See Electrical Characteristics for definition for V_TH.

652 MITCHELL ROAD NEWBURY PARK CA 91320

400mA/200mA Dual 3.3V Smart

Power Switch

SC1543

PRELIMINARY - October 9, 2000

BLOCK DIAGRAM

PIN CONFIGURATION

Top View

(MSOP-8)

PIN DESCRIPTION

Pin Pin Name

Pin Function

1,2

3,4

VIN1

VIN2

Primary input supply, nominally 3.3V.

Secondary input supply, nominally 3.3V.

Power and logic ground.

GND

6,7

VOUT

SHDN

3.3V out.

Shutdown, with internal pull-down. Device is OFF when this pin is High. Leave open if shut-

down feature is not required.

652 MITCHELL ROAD NEWBURY PARK CA 91320

400mA/200mA Dual 3.3V Smart

Power Switch

SC1543

PRELIMINARY - October 9, 2000

OUTLINE DRAWING - MSOP-8

LAND PATTERN - MSOP-8

ECN00-1361

652 MITCHELL ROAD NEWBURY PARK CA 91320

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