MIC5309
Low VIN/VOUT 300mA High PSRR
ULDO™ with Ultra-Low IQ
General Description
Features
The MIC5309 is a high performance, µCap low dropout
regulator, offering ultra-low operating current while
maintaining very fast transient response. The MIC5309
can source up to 300mA of output current and can
regulate down from a low input supply voltage to increase
system efficiency.
• Input voltage range: 1.7V to 5.5V
• Guaranteed 300mA over temperature
• Ultra Low dropout voltage of 100mV typical 300mA
• High PSRR, up to 90dB @ 1kHz
• Output Voltage range: 0.8V to 2.0V
• Very low ground current – 23µA under full load
• Bias supply voltage range: 2.5V to 5.5V
• Stable with 1µF ceramic output capacitor
• 300mA maximum output current at 1.7V input voltage
• Very fast transient response – ideal for digital loads
• Thermal shutdown and current limit protection
• Tiny 6-pin 1.6mm x 1.6mm Thin MLF® package
• Cost effective 6-pin TSOT-23 package
Ideal for battery operated applications; the MIC5309 offers
extremely low dropout voltage 100mV typically @ 300mA
load, and low ground current at all load conditions
(typically 23µA). The MIC5309 can also be put into a zero-
off-mode current state, drawing virtually no current when
disabled.
The MIC5309 is available in fixed output voltages in the
tiny 6-pin 1.6mm x 1.6mm thin MLF® leadless package as
well as the 6-pin TSOT-23 for cost sensitive applications.
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
Applications
• Mobile Phones
• PDAs
• GPS Receivers
• Portable Electronics
___________________________________________________________________________________________________________
Typical Application
MIC5309
BIAS
VOUT
BYP
VIN
MIC23050
DC-to-DC
Converter
Li-Ion
2.7V to 4.2V
EN
CBIAS
1µF
CIN
1µF
GND
CBYP
10nF
COUT
1µF
ULDO is a trademark of Micrel, Inc.
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
M9999-110807-B
November 2007