MIC5205
150mA Low-Noise LDO Regulator
General Description Features
The MIC5205 is an efficient linear voltage regulator with
Ultra-low-noise output
ultra low-noise output, very low dropout voltage (typically
High output voltage accuracy
17mV at light loads and 165mV at 150mA), and very low
Guaranteed 150mA output
ground current (600A at 100mA output). The MIC5205
Low quiescent current
offers better than 1% initial accuracy.
Low dropout voltage
Designed especially for hand-held, battery-powered
Extremely tight load and line regulation
devices, the MIC5205 includes a CMOS or TTL compatible
enable/shutdown control input. When shut down, power
Very low temperature coefficient
consumption drops nearly to zero. Regulator ground
Current and thermal limiting
current increases only slightly in dropout, further
Reverse-battery protection
prolonging battery life.
Zero off-mode current
Key MIC5205 features include a reference bypass pin to
Logic-controlled electronic enable
improve its already excellent low-noise performance,
reversed-battery protection, current limiting, and
overtemperature shutdown.
Applications
The MIC5205 is available in fixed and adjustable output
Cellular telephones
voltage versions in a small SOT-23-5 package.
Laptop, notebook, and palmtop computers
For low-dropout regulators that are stable with ceramic
Battery-powered equipment
output capacitors, see the Cap MIC5245/6/7 family.
CC and VPP regulation/switching
PCMCIA V
Data sheets and support documentation can be found on
Micrels web site at www.micrel.com.
Consumer/personal electronics
SMPS post-regulator/dc-to-dc modules
High-efficiency linear power supplies
___________________________________________________________________________________________________________
Typical Application
Ultra-Low-Noise Regulator Application
Xxxxx is a trademark of Micrel, Inc
Xxxxx is a registered trademark of Micrel, Inc.
Micrel Inc. 2180 Fortune Drive San Jose, CA 95131 USA tel +1 (408) 944-0800 fax + 1 (408) 474-1000 Micrel MIC5205
Ordering Information
Part Number Marking
Accuracy Voltage Temperature Package
(1)
Standard Pb-Free Standard Pb-Free
MIC5205BM5 MIC5205YM5 LBAA KBAA 1% Adj 40C to +125C SOT-23-5
MIC5205-2.5BM5 MIC5205-2.5YM5 LB25 KB25 1% 2.5V 40C to +125C SOT-23-5
MIC5205-2.7BM5 MIC5205-2.7YM5 LB27 KB27 1% 2.7V 40C to +125C SOT-23-5
MIC5205-2.8BM5 MIC5205-2.8YM5 LB28 KB28 1% 2.8V 40C to +125C SOT-23-5
MIC5205-2.85BM5 MIC5205-2.85YM5 LB2J KB2J 1% 2.85V 40C to +125C SOT-23-5
MIC5205-2.9BM5 MIC5205-2.9YM5 LB29 KB29 1% 2.9V 40C to +125C SOT-23-5
MIC5205-3.0BM5 MIC5205-3.0YM5 LB30 KB30 1% 3.0V 40C to +125C SOT-23-5
MIC5205-3.1BM5 MIC5205-3.1YM5 LB31 KB31 1% 3.1V 40C to +125C SOT-23-5
MIC5205-3.2BM5 MIC5205-3.2YM5 LB32 KB32 1% 3.2V 40C to +125C SOT-23-5
MIC5205-3.3BM5 MIC5205-3.3YM5 LB33 KB33 1% 3.3V 40C to +125C SOT-23-5
MIC5205-3.6BM5 MIC5205-3.6YM5 LB36 KB36 1% 3.6V 40C to +125C SOT-23-5
MIC5205-3.8BM5 MIC5205-3.8YM5 LB38 KB38 1% 3.8V 40C to +125C SOT-23-5
MIC5205-4.0BM5 MIC5205-4.0YM5 LB40 KB40 1% 4.0V 40C to +125C SOT-23-5
MIC5205-5.0BM5 MIC5205-5.0YM5 LB50 KB50 1% 5.0V 40C to +125C SOT-23-5
Note:
1. Underbar (_) symbol may not be to scale.
Pin Configuration
MIC5205-x.xBM5/YM5 MIC5205BM5/YM5
Fixed Voltages Adjustable Voltages
Pin Description
MIC5205-x.x MIC5205
Pin Name Pin Function
(fixed) (adjustable)
1 1 IN Supply Input
2 2 GND Ground
3 3 EN Enable/Shudown (Input): CMOS compatible input. Logic high = enable, logic low
or open = shutdown
4 BYP Reference Bypass: Connect external 470pF capacitor to GND to reduce output
noise. May be left open.
4 ADJ Adjust (Input): Adjustable regulator feedback input. Connect to resistor voltage
divider.
5 5 OUT Regulator Ouput
M9999-020806
February 2006 2
(408) 955-1690