MIC5321
Dual, High Performance
150mA µCap ULDO™
General Description
Features
The MIC5321 is a tiny Dual Ultra Low-Dropout
(ULDO™) linear regulator ideally suited for those
applications that require high PSRR because it
provides a bypass pin for those noise sensitive
portable electronics. The MIC5321 integrates two
high-performance; 150mA ULDOs into a very compact
1.6mm x 1.6mm leadless Thin MLF® package that
provides exceptional thermal package characteristics.
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2.3V to 5.5V input voltage range
Ultra-low dropout voltage ULDO™ 35mV @
150mA
Tiny 6-pin 1.6mm x 1.6mm Thin MLF® leadless
package
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Low cost TSOT-23-6 package
Bypass pin for improved noise performance
High PSRR – >75dB on each LDO
Ultra low noise output - > 30µVrms
Dual 150mA outputs
The MIC5321 is a µCap design which enables
operation with very small ceramic output capacitors
for stability, thereby reducing required board space
and component cost. The combination of extremely
low-drop-out voltage, very high power supply
rejection, very low output noise and exceptional
thermal package characteristics makes it ideal for
powering RF application, cellular phone camera
modules, imaging sensors for digital still cameras,
PDAs, MP3 players and WebCam applications.
µCap stable with 1µF ceramic capacitor
Low quiescent current – 150µA
Fast turn-on time – 45µs
Thermal shutdown protection
Current Limit protection
The MIC5321 ULDO™ is available in fixed-output
voltages in the tiny 6-pin 1.6mm x 1.6mm leadless
Thin MLF® package which is only 2.56mm2 in area,
less than 30% the area of the SOT-23, TSOP and
MLF® 3x3 packages. It’s also available in the thin
SOT-23-6 lead package and the standard 6-pin
1.6mm x 1.6mm leadless package. Additional voltage
options are available. For more information, contact
Micrel marketing department.
Applications
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Mobile phones
PDAs
GPS receivers
Portable electronics
Portable media players
Digital still and video cameras
Data sheets and support documentation can be found
on Micrel’s web site at www.micrel.com.
Typical Application
MIC5321-x.xYML
Rx/Synth
Tx
VIN
VOUT 1
VOUT 2
EN
1µF
RF
Transceiver
BYP
GND
1µF
1µF
0.01µF
RF Power Supply Circuit
ULDO is a trademark of Micrel, Inc.
MLF and MicroLeadFrame are registered trademarks of Amkor Technology, 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
M9999-051508-E
May 2008