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
shutdown current.
Key features include reversed-battery protection, current
limiting, overtemperature shutdown, ultra-low-noise capability
(SO-8 and TO-263-5 versions), and availability in thermally
efficient packaging. The MIC5209 is available in adjustable
or fixed output voltages.
For space-critical applications where peak currents do not
exceed 500mA, see the MIC5219.
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
• Ultra-small 3mm x 3mm MLF™ package
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
Typical Applications
MIC5209-2.5BS
V
IN
≥ 3.0V
1
2
3
V
OUT
2.5V ±1%
22µF
tantalum
0.1µF
3.3V Nominal-Input Slot-1
Power Supply
ENABLE
SHUTDOWN
1
2
3
4
MIC5209-5.0BM
8
7
6
5
V
IN
6V
V
OUT
5V
2.2µF
tantalum
470pF
(OPTIONAL)
Ultra-Low-Noise 5V Regulator
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
June 2006
1
M9999-060906
MICREL [ MICREL SEMICONDUCTOR ]
