MIC5337 1.2mm x 1.6mm 300mA Low I LDO Q Ultra Low Dropout with Auto Discharge General Description Features The MIC5337 is a low quiescent current, low dropout 300mA output current regulator with an internal auto discharge feature designed Low I : only 24A operating current Q for optimal performance in a small space. The MIC5337 is Low dropout voltage of 180mV 300mA capable of sourcing 300mA of output current while only Active discharge when enable pin is low consuming 24A of operating current. When the MIC5337 is disabled an internal resistive load is automatically Input voltage range: 2.3V to 5.5V applied to the output to discharge the output capacitor. Fixed output voltages This high performance LDO offers fast transient response Stable with 1F ceramic capacitors as well as maintaining a high PSRR. Thermal shutdown and current limit protection The MIC5337 is an ideal solution for battery operated Tiny 4-pin 1.2mm x 1.6mm Thin MLF package applications due to ultra low operating current and extremely low dropout voltage of 180mV at 300mA. Equipped with a TTL logic compatible enable pin, the Applications MIC5337 can be put into a zero-off-mode current state, Mobile phones drawing virtually no current when disabled. GPS and navigation devices Board space and component cost is minimized because the MIC5337 operates with very small 1F ceramic Portable media players capacitors, provides fixed output voltages, and is available Digital still and video cameras in the tiny 1.2mm x 1.6mm Thin MLF package. PDAs Data sheets and support documentation can be found on Portable electronics Micrels web site at www.micrel.com. Typical Application MIC5337-xxYMT VOUT VIN VOUT 1F 1F VEN VBAT GND 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. MIC5337 Ordering Information (1) (2) (3) Part Number Marking Voltage Temperature Range Package MIC5337-2.8YMT 281 2.8V 40 to +125C 4-Pin 1.2mm x 1.6mm Thin MLF MIC5337-1.8YMT 181 1.8V 40 to +125C 4-Pin 1.2mm x 1.6mm Thin MLF Note: 1. Pin 1 identifier= . 2. For other voltage options contact Micrel Marketing. 3. MLF is a GREEN RoHS compliant package. Lead finish is NiPdAu, Mold compound is Halogen Free. Pin Configuration VIN 1 4 VOUT GND 2 3 EN 4-Pin 1.2mm x 1.6mm Thin MLF (MT) Pin Description Pin Number Pin Name Pin Function 1 VIN Supply Input. 2 GND Ground. 3 EN Enable Input: Active High Input. Logic High = On Logic Low = Off. Do not leave floating. 4 VOUT Output Voltage. HS Pad EPAD Exposed heatsink pad connected to ground internally. M9999-090908-A September 2008 2