
2000 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
VERY LOW DROPOUT 1.5 AMP
REGULATOR WITH ENABLE
SC1565
October 3, 2000
1
Volts
R2
R2)
(R1
1.200
VO
+
=
FEATURES
=
350mV dropout @ 1.5A
=
Adjustable output from 1.2V to 4.8V
(1)
=
2.5V and 1.8V options (adjustable externally using
resistors)
(1)
=
Over current and over temperature protection
=
Enable pin
(1)
=
10μA quiescent current in shutdown
(1)
=
Low reverse leakage (output to input)
=
Surface mount and through-hole packages
=
Full industrial temperature range
Note:
(1) SO-8 and TO-220-5L packages only.
DESCRIPTION
The SC1565 is a high performance positive voltage
regulator designed for use in applications requiring very
low dropout voltage at up to 1.5 Amps. 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 thus
allowing
the
elimination
Additionally, the 5-lead TO-220 and SO-8 versions
have an enable pin to further reduce power dissipation
while shut down. The SC1565 provides excellent
regulation over variations in line, load and temperature.
of
costly
heatsinks.
The SC1565 is available in the popular SO-8 surface
mount package with two internally preset output voltage
options, which are also adjustable using external
resistors. Also available are 5-lead and 3-lead TO-220
2.5V options (fixed output only for the 3-lead option)
and fixed output SOT-223 options.
APPLICATIONS
=
Battery powered systems
=
Motherboards
=
Peripheral cards
=
PCMCIA cards
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
ORDERING INFORMATION
Notes:
(1) Where -X.X denotes voltage options. Available
voltages are: 2.5V and 1.8V. Output voltage can be ad-
justed (except SOT-223 and TO-220-3) using external
resistors, see Pin Description.
(2) Only available in tape and reel packaging. A reel
contains 2500 devices.
(3) Only available in tube packaging (no suffix re-
quired).
DEVICE
(1)
PACKAGE
SC1565IS-X.X.TR
(2)
SC1565IST-X.X.TR
(2)
SC1565IT-X.X
(3)
SC1565I5T-X.X
(3)
SO-8
SOT-223
TO-220-3
TO-220-5
TYPICAL APPLICATIONS
VIN
VO
ENABLE
U1
SC1565IS-X.X
1
2
3
4
5
6
7
8
EN
VIN
VO
ADJ
GND
GND
GND
GND
C1
C2
R1
R2
VIN
VO
ENABLE
U1
SC1565IS-X.X
1
2
3
4
5
6
7
8
EN
VIN
VO
ADJ
GND
GND
GND
GND
C1
C2
VIN
VO
C2
C1
U1
SC1565IT-2.5V and SC1565IST-X.X
3
VIN
VO
1
2
GND
VIN
ENABLE
VO
C1
C2
R1
R2
SU1
2
1
3
5
4
VIN
EN
GND
ADJ
VO
Notes:
(1) Maximum VO setpoint for 1.8V parts = 5.4V.
(2) This device is designed to operate with ceramic input and output capacitors.
Volts
R2
R2)
(R1
1.200
VO
+
=