MIC5305
Micrel
MIC5305
150mA µCap Ultra-Low Dropout LDO Regulator
General Description
Features
The MIC5305 is a high-performance, 150mA LDO regulator,
offering extremely high PSRR and very low noise while
consuming low ground current.
• Ultra-low dropout voltage of 60mV @ 150mA
• Input voltage range: 2.25 to 5.5V
• Stable with ceramic output capacitor
• 150mA guaranteed output current
• Low output noise — 20µVrms
Ideal for battery-operated applications, the MIC5305 fea-
tures 1% accuracy, extremely low-dropout voltage (60mV @
150mA), and low ground current at light load (typically 90µA).
Equipped with a logic-compatible enable pin, the MIC5305
can be put into a zero-off-mode current state, drawing no
current when disabled.
• Low quiescent current of 90µA total
• High PSRR, up to 85dB @1kHz
• Less than 30µs turn-on time w/C
• High output accuracy:
= 0.01µF
BYP
• ±1.0% initial accuracy
The MIC5305 is a µCap design operating with very small
ceramic output capacitors for stability, thereby reducing
required board space and component cost.
• ±2.0% over temperature
• Thermal shutdown protection
• Current limit protection
• Tiny 2mm × 2mm MLF™-6 package
• Thin SOT-23-5 package
TheMIC5305isavailableinfixed-outputvoltagesandadjust-
able output voltages in the super-compact 2mm × 2mm
MLF™-6 leadless package and thin SOT-23-5 package.
Applications
• Cellular phones
• PDAs
• Fiber optic modules
• Portable electronics
• Notebook PCs
Additional voltage options are available. Contact Micrel
marketing.
All support documentation can be found on Micrel’s web
site at www.micrel.com.
• Audio Codec power supplies
Typical Application
Dropout Voltage
70
60
50
40
30
20
10
0
MIC5305
3.0V
VIN
2.85V@150mA
VOUT
VIN VOUT
1µF
EN
BYP
GND
0.1µF
1µF
0
20 40 60 80 100 120 140
OUTPUT CURRENT (mA)
PSRR
(Bypass Pin Cap = 0.1µF)
100
90
80
70
60
50
40
30
20
10
0
150mA
50mA
100µA
0.1
1
10
100
1k
FREQUENCY (kHz)
MicroLeadFrame and MLF are trademarks of Amkor Technology.
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 474-1000 • fax + 1 (408) 474-1000 • http://www.micrel.com
M9999-081704
August 2004
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