SC1541_09 Datasheet, PDF (1/6 Pages) Semtech Corporation – 1.0A Low Dropout Voltage Regulator with Enable

POWER MANAGEMENT
Description
The SC1541 is a high performance low dropout positive
voltage regulator designed for use in applications where
power management is critical, such as battery powered
systems.
Additionally, the SC1541 provides excellent regulation
over variations in line, load and temperature.
Outstanding features include low dropout performance
at rated current, fast transient response, internal
current limiting and thermal shutdown protection of the
output device. A very low quiescent current of 10µA in
shutdown mode reduces power dissipation.
The SC1541 is available with three different voltage
options as standard and two package options, SO-8 and
5-lead TO-263.
SC1541
1.0A Low Dropout Voltage
Regulator with Enable
Features
‹ Low dropout performance, 1.3V max
‹ Full current rating over line and temperature
‹ Fast transient response
‹ +2% total output regulation over line, load
and temperature
‹ 10µA max. quiescent current in shutdown
‹ Three fixed output voltages
‹ Line regulation 0.2% max.
‹ Load regulation 0.4% max.
‹ SO-8 and TO-263 packages
Applications
‹ Low voltage microcontrollers
‹ Switching power supply post-regulation
‹ Instantly available circuits
‹ Motherboards
‹ Battery operated equipment
Typical Application Circuit
V _IN
ENABLE SIGNAL
U1 SC1541
IN
OUT
EN _GND
C1
10uF
Tantalum
V OUT
C2
10uF min.
Tantalum
Notes:
(1) Input and output capacitors should be located close to the device.
(2) Connect all pins to PCB (SO-8 package) for optimal thermal characteristics.
(3) Increasing the output capacitor value will improve the overall transient response.
(4) The device is enabled when V_EN = V_IN, and shut down when EN is pulled to ground. EN should not be taken higher
than V_IN. A CMOS signal referenced to V_IN would be ideal for switching the SC1541 on and off.
Revision: November 25, 2009
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