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SC1537

Features: •Glitch-free transition between input sources•Internal logic selects input source•Gate drive for external PMOS bypass switch•5V detector with hysteresis•1% regulated output voltage accuracy•700mA load current capability•SO-8 and TO-263 packagesAp...

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SC1537: Features: •Glitch-free transition between input sources•Internal logic selects input source•Gate drive for external PMOS bypass switch•5V detector with hysteresis•1% re...

SC1537 Data Sheet

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Part Number:
SC1537
Supply Ability:
5000

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  • 1~5000
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Product Details

Description



Features:

•Glitch-free transition between input sources
•Internal logic selects input source
•Gate drive for external PMOS bypass switch
•5V detector with hysteresis
•1% regulated output voltage accuracy
•700mA load current capability
•SO-8 and TO-263 packages




Application

•= Desktop Computers
•= Network Interface Cards (NICs)
•= PCMCIA/PCI Interface Cards
•= CardbusTM Technology
•= Power supplies with multiple input sources




Specifications

Parameter Symbol Maximum Units
Input Supply Voltage VIN -0.5 to +7 V
Auxiliary Supply Voltage VAUX -0.5 to +7 V
LDO Output Current IO 0 to +700 mA
Operating Ambient Temperature Range TA 0 to +70 °C
Operating Junction Temperature Range Tj 0 to +125 °C
Storage Temperature Range TSTG -65 to +150 °C
Lead Temperature (Soldering) 10 Sec TLEAD 300 °C

Thermal Impedance Junction to Ambient
SO-8(1) TO-263

 JA 65
60		 °C/W
Thermal Impedance Junction to Case
SO-8 TO-263		 J C 39
3		 °C/W
ESD Rating (Human Body Model) ESD 2 kV



Description

The SC1537 is designed to maintain a glitch-free 3.3V output when at least one of two inputs, 5V (VIN) and 3.3V (VAUX), is present.

Whenever VIN exceeds a predetermined threshold value, the internal 3.3V linear regulator is enabled, and DR is pulled high.

When VIN falls below a lower threshold value, DR is pulled low and the internal linear regulator is turned off. DR has been designed to drive the gate of an external low threshold P-channel MOSFET, which can be used to connect the 3.3V supply directly to the regulator output. This ensures an uninterrupted 3.3V output even if VIN falls out of specification. A maximum RDS(ON) of 100m is recommended.

When both supplies are simultaneously available, the drive pin (DR) will be pulled High, turning off the external PMOS switch.

The internal 5V detector has its upper threshold (for VIN rising) set to 4.22V (typical) while the lower threshold (for VIN falling) is at 4.05V (typical) giving a hysteresis of approximately 170mV.

The SC1537 is available in the popular SO-8 and 5-lead TO-263 surface mount packages.




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