MIC5252 Datasheet, PDF (1/9 Pages) Micrel Semiconductor – 150MA HIGH PSRR LOW NOISE UCAP CMOS LDO

MIC5252
Micrel
MIC5252
150mA High PSRR, Low Noise µCap CMOS LDO
General Description
The MIC5252 is an efficient, precise CMOS voltage regulator
optimized for ultra-low-noise applications. It offers 1% initial
accuracy, extremely-low dropout voltage (135mV at 150mA)
and low ground current (typically 90µA). The MIC5252 pro-
vides a very-low-noise output, ideal for RF applications
where a clean voltage source is required. The MIC5252 has
a high PSRR even at low supply voltages, critical for battery
operated electronics. A noise bypass pin is also available for
further reduction of output noise.
Designed specifically for handheld and battery-powered de-
vices, the MIC5252 provides a TTL-logic-compatible enable
pin. When disabled, power consumption drops nearly to zero.
The MIC5252 also works with low-ESR ceramic capacitors,
reducing the amount of board space necessary for power
applications, critical in handheld wireless devices.
Key features include current limit, thermal shutdown, faster
transient response, and an active clamp to speed up device
turn-off. The MIC5252 is available in the 6-pin 2mm × 2mm
MLF™ package and the IttyBitty® SOT-23-5 package in a
wide range of output voltages.
Features
• Input voltage range: 2.7V to 6.0V
• PSRR = 50dB @ V_O + 0.3V
• Ultra-low output noise: 30µV(rms)
• Stability with ceramic output capacitors
• Ultra-low dropout: 135mV @ 150mA
• High output accuracy:
1.0% initial accuracy
2.0% over temperature
• Low quiescent current: 90µA
• Tight load and line regulation
• TTL-Logic-controlled enable input
• “Zero” off-mode current
• Thermal shutdown and current limit protection
Applications
• Cellular phones and pagers
• Cellular accessories
• Battery-powered equipment
• Laptop, notebook, and palmtop computers
• Consumer/personal electronics
Typical Application
C_IN = 1.0µF ^VIN
Ceramic
MIC5252-x.xBM5
1
5
2
V_OUT
ENABLE
SHUTDOWN
V_IN
EN
Enable
Shutdown
3
4
C_OUT = 1.0µF
Ceramic
EN
EN (pin 3) may be
connected directly
to IN (pin 1).
C_BYP = 0.01µF
MIC5252-x.xBML
1
6
2
5
3
4
C_BYP
(optional)
V_OUT
C_OUT
Ultra-Low-Noise Regulator Application
IttyBitty is a registered trademark of Micrel, Inc.
MicroLeadFrame and MLF are trademarks of Amkor Technology.
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 [phone] • fax + 1 [phone] • http://www.micrel.com
December 2003
1
M0394-121003