SC1566_05 Datasheet, PDF (1/12 Pages) Semtech Corporation – Very Low Dropout 3.0 Amp Regulator With Enable

SC1566
Very Low Dropout
3.0 Amp Regulator With Enable
POWER MANAGEMENT
Description
Features
The SC1566 is a high performance positive voltage
regulator designed for use in applications requiring very
low dropout voltage at up to 3 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 heat sink size reduction or elimination.
Additionally, the five pin versions of SC1566 have an
enable pin, to further reduce power dissipation while shut
down. The SC1566 provides excellent regulation over
variations in line, load and temperature.
‹ 350mV dropout @ 3A
‹ Adjustable output from 1.2V to 4.8V
‹ 2.5V and 1.8V options (5 pin parts also adjustable
externally using resistors)
‹ Over current and over temperature protection
‹ Enable pin
‹ 10µA quiescent current in shutdown
‹ Low reverse leakage (output to input)
‹ Full industrial temperature range
‹ TO-220 and TO-263 packages
The SC1566 is available as three terminal fixed output
voltage and five terminal fixed or adjustable output
voltage devices with enable. Two package options are
available: TO-263 and TO-220.
Typical Application Circuits⁽¹⁾⁽²⁾
Applications
‹ Battery powered systems
‹ Motherboards and notebook computers
‹ Peripheral cards
‹ Network cards
‹ Set top boxes
‹ Medical equipment
U1
SC1566I5T-2.5
VIN
1 _VIN
VO ⁵
VO = See equation below
ENABLE
2 _{EN GND ADJ} 4
3
C1
R1
C2
VO
=
1.200
(R1+
R2
R2)
Volts
R2
VIN
ENABLE
U1
SC1566I5T-2.5
1 _VIN
VO ⁵
2 _{EN GND ADJ} 4
C1
3
VO = 2.5V
C2
U1
SC1566IT-1.8
VIN
1 _VIN
VO ³
GND
C1
2
Revision: April 27, 2005
VO = 1.8V
Notes:
C2 _{(1) Maximum VO setpoint for 1.8V parts = 5.4V}
(2) This device is designed to operate with
ceramic input and output capacitors
1
www.semtech.com