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.
Datasheets and support documentation are available on
Micrel’s web site at:
www.micrel.com.
Features
•
Output voltage range: 1.8V
−
5V
®
•
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 × 3mm DFN 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 Application
3.3V Nominal Input Slot 1 Power Supply
Ultra-Low Noise 5V Regulator
Intel is a registered trademark of Intel Corporation.
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 2, 2014
Revision 3.0
Micrel, Inc.
MIC5209
Pin Description
Pin Number
8-Pin DFN
1, 2
7
Pin Number
SOT-223
1
2, TAB
Pin Number
SO-8
2
5
−
8
Pin Number
TO-263-5
2
3
Pin Name
IN
GND
Pin Function
Supply Input.
Ground: SOT-223 Pin 2 and TAB are internally
connected. SO-8 Pins 5 through 8 are internally
connected.
Regulator Output: Pins 3 and 4 must be tied
together.
Enable (Input): CMOS-compatible control input.
Logic High = Enable; Logic Low = Shutdown.
Reference Bypass: Connect external 470pF
capacitor to GND to reduce output noise. Can
be left open. For 1.8V or 2.5V operation, see
Application Information.
Adjust (Input): Feedback input. Connect to
resistive voltage-divider network.
3, 4
8
3
3
1
4
1
OUT
EN
4 (Fixed)
5 (Fixed)
BYP
6
4 (Adjustable)
5 (Adjustable)
ADJ
June 2, 2014
5
Revision 3.0
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