MIC5209
Micrel
MIC5209
500mA Low-Noise LDO Regulator
General Description
The MIC5209 is an efficient linear voltage regulator with very
low dropout voltage, typically 10mV at light loads and less
than 500mV at full load, with better than 1% output voltage
accuracy.
Designed especially for hand-held, battery-powered devices,
the MIC5209 features low ground current to help prolong
battery life. An enable/shutdown pin on SO-8 and TO-263-5
versions can further improve battery life with near-zero shut-
down current.
Key features include reversed-battery protection, current
limiting, overtemperature shutdown, ultra-low-noise capabil-
ity (SO-8 and TO-263-5 versions), and availability in ther-
mally efficient packaging. The MIC5209 is available in adjust-
able or fixed output voltages.
Features
• Meets Intel
®
Slot 1 and Slot 2 requirements
• Guaranteed 500mA output over the full operating
temperature range
• Low 500mV maximum dropout voltage at full load
• Extremely tight load and line regulation
• Thermally-efficient surface-mount package
• Low temperature coefficient
• Current and thermal limiting
• Reversed-battery protection
• No-load stability
• 1% output accuracy
• Ultra-low-noise capability in SO-8 and TO-263-5
Applications
•
•
•
•
•
•
Pentium II Slot 1 and Slot 2 support circuits
Laptop, notebook, and palmtop computers
Cellular telephones
Consumer and personal electronics
SMPS post-regulator/dc-to-dc modules
High-efficiency linear power supplies
For space-critical applications where peak currents do not
exceed 500mA, see the MIC5219.
Typical Applications
MIC5209-2.5BS
Ordering Information
Part Number
MIC5209-2.5BS
MIC5209-3.0BS
MIC5209-3.3BS
Voltage
2.5V
3.0V
3.3V
3.6V
4.2V
5.0V
1.8V
2.5V
3.0V
3.3V
3.6V
5.0V
Adj.
2.5V
3.0V
3.3V
3.6V
5.0V
Adj.
Junct. 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
0°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
–40°C to +125°C
Package
SOT-223
SOT-223
SOT-223
SOT-223
SOT-223
SOT-223
SO-8
SO-8
SO-8
SO-8
SO-8
SO-8
SO-8
TO-263-5
TO-263-5
TO-263-5
TO-263-5
TO-263-5
TO-263-5
1
2
3
V
IN
≥
3.0V
0.1µF
V
OUT
2.5V
±1%
22µF
tantalum
MIC5209-3.6BS
MIC5209-4.2BS
MIC5209-5.0BS
MIC5209-1.8BM
MIC5209-2.5BM
MIC5209-3.0BM
MIC5209-3.3BM
MIC5209-3.6BM
3.3V Nominal-Input Slot-1
Power Supply
ENABLE
SHUTDOWN
MIC5209-5.0BM
1
2
3
4
8
7
6
5
V
IN
6V
V
OUT
5V
2.2µF
tantalum
MIC5209-5.0BM
MIC5209BM
MIC5209-2.5BU
MIC5209-3.0BU
MIC5209-3.3BU
MIC5209-3.6BU
MIC5209-5.0BU
MIC5209BU
470pF
(OPTIONAL)
Ultra-Low-Noise 5V Regulator
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
August 2, 2000
1
MIC5209
MICREL [ MICREL SEMICONDUCTOR ]
