MIC5319 Datasheet, PDF (1/10 Pages) Micrel Semiconductor – 500mA uCap Ultra-Low Dropout, High PSRR LDO Regulator

MIC5319
Micrel
MIC5319
500mA µCap Ultra-Low Dropout, High PSRR LDO Regulator
General Description
The MIC5319 is a high-performance, 500mA LDO regulator,
offering extremely high PSRR and very low noise while
consuming low ground current.
Ideal for battery-operated applications, the MIC5319 fea-
tures 1% accuracy, extremely low-dropout voltage (200mV
@ 500mA), and low ground current at light load (typically
90µA). Equipped with a logic-compatible enable pin, the
MIC5319 can be put into a zero-off-mode current state,
drawing no current when disabled.
The MIC5319 is a µCap design operating with very small
ceramic output capacitors for stability, thereby reducing
required board space and component cost.
The MIC5319 is available in fixed-output voltages and adjust-
able output voltages in the super-compact 2mm x 2mm
MLF™ leadless package and thin SOT-23-5 package.
Additional voltage options are available. Contact Micrel
marketing.
All support documentation can be found on Micrel’s web
site at www.micrel.com.
Features
• Ultra-low dropout voltage 200mV @ 500mA
• Input voltage range: 2.5 to 5.5V
• Stable with ceramic output capacitor
• Low output noise — 40µVrms
• Low quiescent current of 90µA total
• High PSRR, up to 70dB @1kHz
• Fast turn-on-time — 40µs typical
• High output accuracy:
• ±1.0% initial accuracy
• ±2.0% over temperature
• Thermal shutdown protection
• Current-limit protection
• Logic-controlled Enable
• Tiny 2mm x 2mm MLF™ package, 500mA continuous
• Thin SOT-23-5 package, 500mA peak
Applications
• Cellular phones
• PDAs
• Fiber optic modules
• Portable electronics
• Notebook PCs
• Audio Codec power supplies
Typical Application
V_IN
1µF
MIC5319
VIN VOUT
EN BYP
GND
0.1µF
2.8V@500mA
V_OUT
2.2µF
200
180
160
140
120
100
80
60
40
20
0
0
Dropout Voltage
Vout = 2.8V
Cout = 2.2uF
100 200 300 400 500
OUTPUT CURRENT (mA)
PSRR
(Bypass Pin Cap = 0.1µF)
100
90
80
50mA 100µA
70
60
50
40
500mA
30
20
Vout = 2.8V
10
Vin = Vout + 1V
Cout = 2.2uF
0
10 100 1k 10k 100k 1M
FREQUENCY (Hz)
MicroLeadFrame and MLF are trademarks of Amkor Technology, Inc.
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 [phone] • fax + 1 [phone] • http://www.micrel.com
October 2004
1
M9999-100604