SC8863_05 Datasheet, PDF (1/11 Pages) Semtech Corporation – 150mA Ultra Low Dropout, Low Noise Regulator

POWER MANAGEMENT
Description
The SC8863 is a low dropout linear regulator that
operates from a +2.5V to +6.0V input range and
delivers up to 150mA. A PMOS pass transistor allows
the low 110µA 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 SC8863 output voltage can be preset or adjusted
with an external resistor divider. Other features include
low power shutdown, short circuit protection, thermal
shutdown protection and reverse battery protection. The
SC8863 comes in the tiny 5 lead SOT-23 package (lead
free, fully WEEE and RoHS compliant available) and the
ultra low profile 5 lead TSOT-23.
Typical Application Circuits
SC8863
150mA Ultra Low Dropout,
Low Noise Regulator
Features
‹ Guaranteed 150mA output current
‹ Works with ceramic capacitors
‹ Fixed or adjustable output
‹ Very small external components
‹ Low 75µV_RMS output noise
‹ Very low supply current
‹ Thermal overload protection
‹ Reverse battery protection
‹ Low power shutdown
‹ Full industrial temperature range
‹ Very low profile packaging available (1mm max.
height)
‹ Surface mount packaging (SOT-23-5 and
TSOT-23-5)
Applications
‹ Battery Powered Systems
‹ Cellular Telephones
‹ Cordless Telephones
‹ Personal Digital Assistants
‹ Portable Instrumentation
‹ Modems
‹ PCMCIA cards
VIN > VOUT + VD(MAX)
U1
3
IN
SC8863
4
OUT
C1
1uF Ceramic
1
5
EN GND SET
2
VOUT @ IOUT up to 150mA
C2
1uF Ceramic
VIN > VOUT + VD(MAX)
Internally Preset Output Voltage
U1
3
IN
SC8863
4
OUT
R1
1
5
EN _GND SET
2
R2
C1
10k
1uF Ceramic
VOUT @ IOUT up to 150mA
V_OUT
= 1.250 • 1+

R1 _
R2 _
C2
2.2uF Ceramic
Externally Preset Output Voltage⁽¹⁾
Note:
(1) Select R1 and R2 such that the current flowing through them is ≥ 10µA (i.e. R2 ≤ 120kΩ). A value of 10kΩ
is recommended for R2. Please see Component Selection - Externally Set Output on page 7.
Revision: November 8, 2005
1
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