SC553 Datasheet, PDF (1/7 Pages) Semtech Corporation – 150mA Ultra Low Dropout Regulator with Adjustable Output

POWER MANAGEMENT
Description
The SC553 is a low dropout linear regulator that
operates from a +2.25V to +6.5V input range and
delivers up to 150mA. A PMOS pass transistor allows
the low 75µA supply current to remain independent of
load, making these devices ideal for battery operated
portable equipment such as cellular phones, cordless
phones and personal digital assistants.
The SC553 has an adjust pin (ADJ) enabling the user to
set the output voltage anywhere from 1.25V to 6V. For a
low noise version, see SC1453 and for an error flag see
SC1457. Other features include low powered shutdown,
short circuit protection, thermal shutdown protection and
reverse battery protection. The SC553 comes in the tiny
5 lead SOT-23 package.
Typical Application Circuit
SC553
150mA Ultra Low Dropout
Regulator with Adjustable Output
Features
! “5205” compatible pinout
! 2% output accuracy guaranteed over line, load and
temperature
! Guaranteed 150 mA output current
! Very small external components - designed to work
with ceramic capacitors
! Output adjustable from 1.25V to 6V
! Very low supply current
! Thermal overload protection
! Reverse battery protection
! Low power shutdown
! Full industrial temperature range
! Surface mount packaging (5 pin SOT-23)
Applications
! Battery Powered Systems
! Cellular Telephones
! Cordless Telephones
! Personal Digital Assistants
! Portable Instrumentation
! Modems
! PCMCIA cards
U1
SC553
VIN
1
IN
5
OUT
VOUT
C1
1uF
3
4
EN _GND ADJ
R1
C2
1uF
2
V_OUT
= 1.250 • 1+

R1 _
R2 _
R2
Revision: April 20, 2004
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