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SC1543

Features: • Glitch free transitions between inputs• Internal logic selects appropriate input• 400mA load current capability from main input• Low power shutdown mode• Industrial temperature rangeApplication• Mini PCI cards• Peripheral cards• Instantly...

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SeekIC No. : 004485505 Detail

SC1543: Features: • Glitch free transitions between inputs• Internal logic selects appropriate input• 400mA load current capability from main input• Low power shutdown mode• In...

SC1543 Data Sheet

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Part Number:
SC1543
Supply Ability:
5000

Price Break

  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Upload time: 2025/12/26

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Product Details

Description



Features:

• Glitch free transitions between inputs
• Internal logic selects appropriate input
• 400mA load current capability from main input
• Low power shutdown mode
• Industrial temperature range


Application

• Mini PCI cards
• Peripheral cards
• Instantly available personal computers (IAPCs)


Pinout

Connection Diagram


Specifications

Parameter

Symbol

Maximum

Units

Input Supply Voltage

VIN1,2

-0.5 to +6

V

Output Current From:
VIN1
VIN2

IO

400
200

mA

Operating Ambient Temperature Range

TA

-40 to +85

°C

Operating Junction Temperature Range

TJ

-40 to +125

°C

Storage Temperature Range

TSTG

-65 to +150

°C

Lead Temperature (Soldering, 10 Sec.)

TLEAD

300

°C

Thermal Impedance Junction to Ambient

JA

206

°C/W




Description

The SC1543 provides a glitch free 3.3V output whenone of two 3.3V input sources is present.  It does notrequire external logic to sequence from one inputsource to the other.  Whenever VIN1 exceeds apredetermined threshold value the internal MOSFETconnects it's source voltage to the output.  If the input atVIN1 is below the threshold another internal MOSFETconnects VIN2 to the output.  If both inputs are at 3.3Vthen VIN1 will be connected to the output.

The SC1543 is designed to provide 400mA from themain input (VIN1) and 200mA from the secondary input(VIN2). A very low quiescent current of 10µA inshutdown mode reduces power dissipation.

The internal logic and control circuit detects the voltagelevels of VIN1 and VIN2, and compares them to aninput reference voltage of 2.9V.  An internally controlledperiod of switch overlap ensures that the transitionbetween supplies is as glitch-free as possible.

The SC1543 is available in an MSOP-8 surface mountpackage.




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