SC1563_06 Datasheet, PDF (1/10 Pages) Semtech Corporation – VERY LOW DROPOUT, LOW QUIESCENT 500mA REGULATOR

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
V_OUT
=
1.200
(R1+
R2
R2)
Volts
Revision: January 11, 2006
1
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