MIC5252
Micrel
MIC5252
150mA High PSRR, Low Noise
碌
Cap 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 90碌A(chǔ)). 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
脳
2mm
MLF鈩?package and the IttyBitty廬 SOT-23-5 package in a
wide range of output voltages.
Features
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Input voltage range: 2.7V to 6.0V
PSRR = 50dB @ V
O
+ 0.3V
Ultra-low output noise: 30碌V(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: 90碌A(chǔ)
Tight load and line regulation
TTL-Logic-controlled enable input
鈥淶ero鈥?off-mode current
Thermal shutdown and current limit protection
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Applications
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Cellular phones and pagers
Cellular accessories
Battery-powered equipment
Laptop, notebook, and palmtop computers
Consumer/personal electronics
Typical Application
MIC5252-x.xBM5
1
2
3
4
5
V
IN
C
IN
= 1.0碌F
Ceramic
Enable
Shutdown
V
IN
V
OUT
C
OUT
= 1.0碌F
Ceramic
C
BYP
= 0.01碌F
MIC5252-x.xBML
1
2
3
6
5
4
V
OUT
C
BYP
(optional)
ENABLE
SHUTDOWN
EN
C
OUT
EN
EN (pin 3) may be
connected directly
to IN (pin 1).
Ultra-Low-Noise Regulator Application
IttyBitty is a registered trademark of Micrel, Inc.
Micro
LeadFrame and MLF are trademarks of Amkor Technology.
Micrel, Inc. 鈥?1849 Fortune Drive 鈥?San Jose, CA 95131 鈥?USA 鈥?tel + 1 (408) 944-0800 鈥?fax + 1 (408) 944-0970 鈥?http://www.micrel.com
December 2003
1
M0394-121003
MIC5252相關(guān)型號(hào)PDF文件下載
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