MIC5305
150mA µCap Ultra-Low Dropout
LDO Regulator
MLF and MicroLeadFrame are registered trademarks of Amkor Technology, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
June 2007 1
M9999-062507
General Description
The MIC5305 is a high-performance, 150mA LDO regula-
tor, offering extremely high PSRR and very low noise while
consuming low ground current.
Ideal for battery-operated applications, the MIC5305
features 1% accuracy, extremely low-dropout voltage
(60mV @ 150mA), and low ground current at light load
(typically 90µA). Equipped with a logic-compatible enable
pin, the MIC5305 can be put into a zero-off-mode current
state, drawing no current when disabled.
The MIC5305 is a µCap design operating with very small
ceramic output capacitors for stability, thereby reducing
required board space and component cost.
The MIC5305 is available in fixed output voltages and
adjustable output voltages in the super-compact 6-pin
2mm × 2mm MLF
®
leadless package, our new ultra-thin
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 60mV @ 150mA
• Input voltage range: 2.25 to 5.5V
• Stable with ceramic output capacitor
• 150mA guaranteed output current
• Low output noise — 20µVrms
• Low quiescent current of 90µA total
• High PSRR, up to 85dB @1kHz
• Less than 30µs turn-on time w/C
BYP
= 0.01µF
• High output accuracy:
– ±1.0% initial accuracy
– ±2.0% over temperature
• Thermal shutdown protection
• Current limit protection
• Tiny 6-pin 2mm × 2mm MLF
®
package
• Ultra-Thin 6-pin 2mm × 2mm Thin MLF
®
package
• Thin SOT-23-5 package
Applications
• Cellular phones
• PDAs
• Fiber optic modules
• Portable electronics
• Notebook PCs
• Audio Codec power supplies
Typical Application
0
10
20
30
40
50
60
70
0 20 40 60 80 100 120 140
DROPOUT VOLTAGE (mV)
OUTPUT CURRENT (mA)
Dropout Voltage
MIC5305
VOUTVIN
BYPEN
GND
3.0V
V
IN
2.85V@150mA
V
OUT
1µF0.1µF
1µF
0
10
20
30
40
50
60
70
80
90
100
0.1 1 10 100
PSRR (dB)
FREQUENCY (kHz)
PSR
(Bypass Pin Cap = 0.1µF)
150mA
50mA
100µA
1k
