MIC5309 Low V /V 300mA High PSRR IN OUT ULDO with Ultra-Low IQ General Description Features The MIC5309 is a high performance, Cap low dropout Input voltage range: 1.7V to 5.5V regulator, offering ultra-low operating current while Guaranteed 300mA over temperature maintaining very fast transient response. The MIC5309 Ultra Low dropout voltage of 100mV typical 300mA can source up to 300mA of output current and can High PSRR, up to 90dB 1kHz regulate down from a low input supply voltage to increase system efficiency. Output Voltage range: 0.8V to 2.0V Ideal for battery operated applications the MIC5309 offers Very low ground current 23A under full load extremely low dropout voltage 100mV typically 300mA Bias supply voltage range: 2.5V to 5.5V load, and low ground current at all load conditions Stable with 1F ceramic output capacitor (typically 23A). The MIC5309 can also be put into a zero- 300mA maximum output current at 1.7V input voltage off-mode current state, drawing virtually no current when Very fast transient response ideal for digital loads disabled. Thermal shutdown and current limit protection The MIC5309 is available in fixed output voltages in the tiny 6-pin 1.6mm x 1.6mm thin MLF leadless package as Tiny 6-pin 1.6mm x 1.6mm Thin MLF package well as the 6-pin TSOT-23 for cost sensitive applications. Cost effective 6-pin TSOT-23 package Data sheets and support documentation can be found on Micrels web site at: www.micrel.com. Applications Mobile Phones PDAs GPS Receivers Portable Electronics Typical Application MIC5309 BIAS VOUT VIN MIC23050 Li-Ion DC-to-DC 2.7V to 4.2V EN C C Converter BIAS IN 1F 1F BYP GND C C BYP OUT 10nF 1F 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 Micrel, Inc. MIC5309 Ordering Information Part Number Voltage Marking Codes Temperature Range Package MIC5309-1.2YMT 1.2V 1S2 40 to +125C 6-Pin 1.6mm x 1.6mm Thin MLF MIC5309-1.5YMT 1.5V 1S5 40 to +125C 6-Pin 1.6mm x 1.6mm Thin MLF MIC5309-1.8YMT 1.8V 1S8 40 to +125C 6-Pin 1.6mm x 1.6mm Thin MLF MIC5309YMT Adj. ASA 40 to +125C 6-Pin 1.6mm x 1.6mm Thin MLF MIC5309-1.2YD6 1.2V QS12 40 to +125C 6-Pin TSOT-23 MIC5309-1.5YD6 1.5V QS15 40 to +125C 6-Pin TSOT-23 MIC5309-1.8YD6 1.8V QS18 40 to +125C 6-Pin TSOT-23 MIC5309YD6 Adj. QSAA 40 to +125C 6-Pin TSOT-23 Notes For other voltage options. Contact Micrel Marketing for details. Pin 1 identifier = . MLF is a GREEN RoHS compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free. Pin Configuration GND BIAS VIN 3 2 1 BIAS 1 6 BYP/ADJ GND 2 5 EN VIN 3 4 VOUT 45 6 BYP/ADJ EN VOUT 6-Pin TSOT-23 (D6) 6-Pin 1.6mm x 1.6mm Thin MLF (MT) Pin Description Pin Number Pin Number Pin Name Pin Function Thin MLF-6 TSOT-23-6 3 1 VIN Power Input for LDO. 2 2 GND Ground 1 3 BIAS Bias Input Voltage. BYP Bypass: Connect a capacitor to ground to reduce noise and reduce ripple rejection. 6 4 ADJ Adjustable: Feedback input from external resistor divider. 5 5 EN Enable Input: Active High Input. Logic High = On Logic Low = Off Do not leave floating. 4 6 VOUT Output of regulator. HS Pad EPAD Exposed heatsink pad connected to ground internally. M9999-051508-D May 2008 2