MIC5357
High Performance, Low Noise Dual
500mA ULDO™
ULDO is a trademark of Micrel, Inc
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
General Description
The MIC5357 is a tiny Dual Ultra Low Dropout (ULDO™)
linear regulator ideally suited for portable electronics due
to its low output noise. The MIC5357 provides two
independently controlled high performance 500mA LDOs
with typical dropout voltage of 130mV at rated load. In
addition, the MIC5357 provides a bypass pin to reduce the
output noise.
The MIC5357 is designed to be stable with small ceramic
output capacitors thereby reducing required board space
and component cost. The combination of extremely low
dropout voltage, low output noise and exceptional thermal
package characteristics makes it ideal for powering RF
and noise sensitive circuitry, cellular phone camera
modules, imaging sensors for digital still cameras, PDAs,
MP3 players and WebCam applications.
The MIC5357 ULDO™ is available in fixed output voltages
in the small 8-pin ePad MSOP package. Additional voltage
options are available. For more information, contact Micrel
marketing.
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com
.
Features
• 2.6V to 5.5V input voltage range
• Ultra low dropout voltage: 130mV @ 500mA
• Ultra low output noise: 51µV
RMS
• ±2% initial output accuracy
• Small 8-pin ePad MSOP package
• Excellent Load/Line transient response
• Fast start up time: 38µs
• µCap stable with 2.2µF ceramic capacitors
• Thermal shutdown protection
• Low quiescent current: 160µA with both outputs at
maximum load
• Current-limit protection
Applications
• Battery-Powered Applications
• PDAs
• GPS receivers
• Portable electronics
• Portable media players
• Digital still and video cameras
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Typical Application
January 2011
M9999-011311
RF Power Supply Circuit
