VERY LOW DROPOUT, LOW
QUIESCENT 500mA REGULATOR
PRELIMINARY - September 11, 2000
SC1563
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
DESCRIPTION
The SC1563 is a high performance positive voltage
regulator designed for use in applications requiring
very low dropout voltage at up to 500 milliamps. Since
it has superior 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.
The SC1563 is available as a five terminal fixed or
adjustable output voltage device with enable. The
device is available in a 5-pin SOT-23 package and an
8-pin MSOP package for higher power dissipation/
lower junction temperature.
FEATURES
•=
450mV dropout @ 500mA
•=
Designed to operate with ceramic capacitors
•=
Adjustable output from 1.200V to 3.3V
•=
Multiple output voltage options (all parts also
•=
•=
•=
•=
•=
adjustable externally using resistors)
Over current and over temperature protection
Enable pin
1µA quiescent current in shutdown
Low reverse leakage (output to input)
Full industrial temperature range
APPLICATIONS
•=
Battery powered systems
•=
Motherboards
•=
Peripheral cards
•=
PCMCIA cards
ORDERING INFORMATION
DEVICE
(1)(2)(3)
PACKAGE
SOT-23-5L
MSOP-8
SC1563ISK-X.XTR
SC1563IMS-X.XTR
TYPICAL APPLICATION
Internally Preset Output Voltage
U1
5
VIN
1
SHDN
C1
VIN
SHDN GND
2
3
SC1563ISK-X.X
VO
4
VO (X.XV)
Notes:
(1) Where -X.X denotes voltage options. Available
voltages are: 1.8V, 2.5V, 2.8V, 3.0V, 3.1V and 3.3V.
(2) Output voltage can be adjusted using external re-
sistors, see Pin Description.
(3) Only available in tape and reel packaging. A reel
contains 2500 devices (MSOP-8) or 3000 devices
(SOT-23-5L).
Externally Set Output Voltage
U1
5
VIN
1
SHDN
C2
C1
VIN
SHDN GND
2
SC1563ISK-X.X
VO
4
R1
VO
ADJ
ADJ
3
C2
R2
VO
=
1.200 (R1
+
R2)
R2
Volts
1
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652 MITCHELL ROAD NEWBURY PARK CA 91320
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