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SC1565_09 Datasheet, PDF (1/14 Pages) Semtech Corporation – Very Low Dropout 1.5 Amp Regulator With Enable
POWER MANAGEMENT
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 of costly heatsinks. Additionally,
the 5-lead TO-220/TO-263 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.
The SC1565 is available in SO-8, 3-lead SOT-223, 3 and
5 lead TO-220 and 3 and 5 lead TO-263 packages. Three
lead packages are available with 1.8V and 2.5V fixed
output options only. The SO-8, TO-220-5 and TO-263-5
are available with 1.8V and 2.5V internally preset
outputs that are also adjustable using external resistors.
SC1565
Very Low Dropout
1.5 Amp Regulator With Enable
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
‹ TO-220, TO-263, SOT-223 and SO-8 Packages
Note:
(1) SO-8, TO-220-5 and TO-263-5 packages only.
Applications
‹ Battery powered systems
‹ Motherboards
‹ Peripheral cards
‹ Network cards
‹ Set Top Boxes
‹ Medical Equipment
‹ Notebook Computers
Typical Application Circuits
ENABLE
VIN
VO
VIN
U1
1 EN GND 8
2 VIN GND 7
3
6
VO GND
4 ADJ GND 5
R1
SC1565IS-X.X
C1
C2
R2
VO = 1.200 (R1 + R2) Volts
R2
U1
SC1565IT-X.X
1 VIN
VO 3
GND
C1
2
VIN
ENABLE
VO
C2
ENABLE
VIN
VO
C1
C2
U1
SC1565I5T-X.X
2 VIN
VO 4
1 EN GND ADJ 5
3
C1
U1
1 EN GND 8
2 VIN GND 7
3 VO GND 6
4 ADJ GND 5
SC1565IS-X.X
VO = 1.200 (R1 + R2) Volts
R2
VO
R1
C2
R2
Notes:
(1) Maximum VO setpoint for 1.8V parts = 5.4V.
(2) This device is designed to operate with ceramic input and output capacitors.
Revision: November 25, 2009
1
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