MIC5323 Datasheet, PDF (1/15 Pages) Micrel Semiconductor – High PSRR Low Noise 300mA μCap Ultra-Low Dropout LDO Regulator

MIC5323
High PSRR Low Noise 300mA µCap
Ultra-Low Dropout LDO Regulator
General Description
The MIC5323 is a high-performance, 300mA LDO regula-
tor, offering extremely high PSRR and very low noise while
consuming low ground current.
Ideal for battery operated applications, the MIC5323
features 2% accuracy, extremely low dropout voltage
(120mV @ 300mA), and low ground current at light load
(typically 90µA). When disabled, the MIC5323 typically
consumes less than 1µA.
The MIC5323 is a µCap design operating with small
ceramic output capacitors for stability, thereby reducing
required board space and component cost.
The MIC5323 is available in fixed output voltages and
adjustable output voltages in the super compact
6-pin 2mm × 2mm Thin MLF^® and thin SOT-23-5 package.
Additional voltage options are available. Contact Micrel
marketing.
Data sheets and support documentation can be found on
Micrel’s web site at www.micrel.com.
Features

Ultra low dropout voltage of 120mV @ 300mA

Input voltage range: 2.65 to 5.5V

Stable with ceramic output capacitor

300mA guaranteed output current

Low output noise — 20µVrms

High PSRR, up to 80dB @1kHz

Less than 30µs turn-on time with C_BYP = 0.1µF

High output accuracy: ±2.0% over temperature

Thermal shutdown protection

Current limit protection

6-pin 2mm × 2mm Thin MLF^® package

Thin SOT-23-5 package
Applications

Cellular phones

Notebook and Tablet Computers

Fiber optic modules

Portable electronics

Instrumentation Systems

Audio Codec power supplies
Typical Application
Power Supply Rejection Ratio
(C_BYP = 0.1µF)
0
-10
-20
I_OUT = 300mA
-30
-40
I_OUT = 100mA
-50
-60
I_OUT = 1mA
-70
-80
V_IN = V_OUT + 1V
-90
V_OUT = 1.8V
-100
1.E+01 1.E+02 1.E+03 1.E+04 1.E+05 1.E+06
FREQUENCY (Hz)
MicroLeadFrame and MLF are trademarks of Amkor, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
November 2011
1
M9999-110311B