MIC5237 500mA Low-Dropout Regulator General Description Features The MIC5237 is a general-purpose low-dropout regulator Guaranteed 500mA output over the full operating capable of 500mA output current with better than 3% temperature range output voltage accuracy. Using Micrels proprietary Super Low 300mV typical dropout voltage at full load eta PNP process with a PNP pass element, these Extremely tight load and line regulation regulators feature less than 300mV dropout voltage and Current and thermal limiting typically 8mA ground current at full load. Reversed-battery protection Designed for applications that require moderate current over a broad input voltage range, including hand-held and TO-220 and TO-263 packages battery-powered devices, the MIC5237 is intended for Low temperature coefficient applications that can tolerate moderate voltage drop at No-load stability higher current. Low-noise output Key features include low ground current to help prolong battery life, reversed-battery protection, current limiting, over-temperature shutdown, and thermally efficient Applications packaging. The MIC5237 is available in fixed output Portable and laptop computers voltages only. Desktop computer For space-critical applications and improved performance, Battery chargers see the MIC5209 and MIC5219. For output current requirements up to 750mA, see the MIC2937. SMPS post-regulator/dc-to-dc modules Data sheets and support documentation can be found on Consumer and personal electronics Micrels web site at: www.micrel.com. Typical Application Super eta PNP is a registered trademark of Micrel, Inc. Micrel Inc. 2180 Fortune Drive San Jose, CA 95131 USA tel +1 (408) 944-0800 fax + 1 (408) 474-1000 Micrel, Inc. MIC5237 Ordering Information Part Number Voltage Junction Temp. Range Package Standard Pb-Free MIC5237-2.5BU MIC5237-2.5YU 2.5V 40 to +125C TO-263-3 MIC5237-3.3BU MIC5237-3.3YU 3.3V 40 to +125C TO-263-3 MIC5237-5.0BT MIC5237-5.0YT 5.0V 40 to +125C TO-220-3 MIC5237-5.0BU MIC5237-5.0YU 5.0V 40 to +125C TO-263-3 Pin Configuration TO-220-3 (T) TO-263-3 (U) Pin Description Pin Number Pin Name Pin Function 1 IN Supply Input. 2, TAB GND Ground: TO-220 and TO-263 pin 2 and TAB are internally connected. 3 OUT Regulator Output. M9999-090607-C September 2007 2