Purchase SC1543, In-stock SC1543 From SeekIC.
Part Number: SC1543
Description: The SC1543 provides a glitch free 3.3V output whenone of two 3.3V input sources is present. It d...
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SC1543
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DataSheet
General Description
SC1543 General 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.
SC1543 Maximum Ratings
|
Parameter |
Symbol |
Maximum |
Units |
|
Input Supply Voltage |
VIN1,2 |
-0.5 to +6 |
V |
|
Output Current From: |
IO |
400 |
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 |
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 range
• Internal logic selects appropriate input
• 400mA load current capability from main input
• Low power shutdown mode
• Industrial temperature range
SC1543 Typical Application
• Mini PCI cards
• Peripheral cards
• Instantly available personal computers (IAPCs)
• Peripheral cards
• Instantly available personal computers (IAPCs)
SC1543 Connection Diagram
SC1543IMSTR
PDF/DataSheet Download
- Datasheet: SC1543IMSTR
- File Size: 57585 KB
- Manufacturer: SEMTECH [Semtech Corporation]
- Click here to Download
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