POWER MANAGEMENT
Description
The SC1563 is a high performance positive voltage
regulator designed for use in applications requiring very
low dropout voltage at up to 500mA. Since it has supe-
rior dropout characteristics compared to regular LDOs, it
can be used to supply 2.5V on motherboards or 2.8V on
peripheral cards from the 3.3V supply with no heatsink.
Additionally, the SC1563 has a shutdown pin to further
reduce power dissipation while shut down. The SC1563
provides excellent regulation over variations in line, load
and temperature.
A wide range of fixed output voltage options are avail-
able. In addition, the output voltage of every device can
be adjusted between 1.2V and 4.8V using external resis-
tors. The SC1563 comes in the space saving 5-pin SOT-
23 package.
Typical Application Circuits
SC1563
Very Low Dropout, Low
Quiescent 500mA Regulator
Features
350mV dropout @ 500mA
Designed to operate with ceramic capacitors
Adjustable output from 1.2V to 4.8V
Multiple output voltage options (all parts also
adjustable externally using resistors)
Over current and over temperature protection
2µA quiescent current in shutdown
No minimum load current requirement
Low reverse leakage (output to input)
Full industrial temperature range
5-pin SOT-23 surface mount package. Also avail-
able in Lead-free, fully WEEE and RoHS compliant
Applications
Personal Digital Assistants
Battery powered systems
Motherboards
Peripheral cards
PCMCIA cards
Internally Preset Output Voltage
Externally Set Output Voltage
VIN
SHDN
U1
5
IN
SC1563IS-X.X
4
OUT
1
SHDN GND ADJ
C1
2
3
VO (X.XV)
C2
VIN
SHDN
U1
5
IN
SC1563IS-X.X
4
OUT
1
SHDN GND ADJ
C1
2
3
VO
R1
C2
R2
VOUT
=
1.200
(R1+
R2
R2)
Volts
Revision: January 11, 2006
1
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