MIC5205
Micrel
MIC5205
150mA Low-Noise LDO Regulator
General Description
The MIC5205 is an efficient linear voltage regulator with ultra-
low-noise output, very low dropout voltage (typically 17mV at
light loads and 165mV at 150mA), and very low ground
current (600µA at 100mA output). The MIC5205 offers better
than 1% initial accuracy.
Designed especially for hand-held, battery-powered devices,
the MIC5205 includes a CMOS or TTL compatible enable/
shutdown control input. When shutdown, power consump-
tion drops nearly to zero. Regulator ground current increases
only slightly in dropout, further prolonging battery life.
Key MIC5205 features include a reference bypass pin to
improve its already excellent low-noise performance, re-
versed-battery protection, current limiting, and
overtemperature shutdown.
The MIC5205 is available in fixed and adjustable output
voltage versions in a small SOT-23-5 package.
Features
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Ultra-low-noise output
High output voltage accuracy
Guaranteed 150mA output
Low quiescent current
Low dropout voltage
Extremely tight load and line regulation
Very low temperature coefficient
Current and thermal limiting
Reverse-battery protection
“Zero” off-mode current
Logic-controlled electronic enable
Cellular telephones
Laptop, notebook, and palmtop computers
Battery-powered equipment
PCMCIA V
CC
and V
PP
regulation/switching
Consumer/personal electronics
SMPS post-regulator/dc-to-dc modules
High-efficiency linear power supplies
Applications
For low-dropout regulators that are stable with ceramic
output capacitors, see the
µ
Cap MIC5245/6/7 family.
Ordering Information
Part Number
MIC5205BM5
MIC5205-2.5BM5
MIC5205-2.7BM5
MIC5205-2.8BM5
MIC5205-2.85BM5
MIC5205-2.9BM5
MIC5205-3.0BM5
MIC5205-3.3BM5
MIC5205-3.6BM5
MIC5205-3.8BM5
MIC5205-4.0BM5
MIC5205-5.0BM5
Marking
LBAA
LB25
LB27
LB28
LB2J
LB29
LB30
LB33
LB36
LB38
LB40
LB50
Voltage
Adj
2.5V
2.7V
2.8V
2.85V
2.9V
3.0V
3.3V
3.6V
3.8V
4.0V
5.0V
Accuracy
1%
1%
1%
1%
1%
1%
1%
1%
1%
1%
1%
1%
Junction Temp. Range*
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
Package
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
Other voltages available. Contact Micrel for details.
Typical Application
V
IN
MIC5205-x.xBM5
1
2
Enable
Shutdown
3
4
5
V
OUT
EN
EN (pin 3) may be
connected directly
to IN (pin 1).
C
OUT
= 2.2µF
tantalum
Low-Noise Operation:
C
BYP
C
BYP
= 470pF, C
OUT
≥
2.2µF
Basic Operation:
C
BYP
= not used, C
OUT
≥
1µF
Ultra-Low-Noise Regulator Application
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
June 2000
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MIC5205