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SC1534

Semtech Corporation
Part Number SC1534
Manufacturer Semtech Corporation
Description 400mA SmartLDOTM
Published Apr 8, 2005
Detailed Description 400mA SmartLDO TM SC1534 PRELIMINARY - July 26, 2000 TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com D...
Datasheet PDF File SC1534 PDF File

SC1534
SC1534

Overview
400mA SmartLDO TM SC1534 PRELIMINARY - July 26, 2000 TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.
semtech.
com DESCRIPTION The SC1534 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 200mΩ 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 SC1534 is available in the popular SO-8 and 5lead TO-263 surface mount packages.
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 400mA load current capability SO-8 and TO-263 packages APPLICATIONS Desktop Computers Network Interface Cards (NICs) PCMCIA/PCI Interface Cards CardbusTM Technology Power supplies with multiple input sources (1) ORDERING INFORMATION Part Number Package TO-263-5L SO-8 SC1534CM.
TR SC1534CS.
TR Note: (1) Only available in tape and reel packaging.
ABSOLUTE MAXIMUM RATINGS Parameter Input Supply Voltage Auxiliary Supply Voltage Symbol VIN VAUX IO TA TJ TSTG TLEAD Maximum -0.
5 to +7 -0.
5 to +7 10 to 400 -5 to +70 -5 to +125 -65 to +150 300 Units V V mA °C °C °C ...


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