MIC5258 Micrel, Inc. MIC5258 150mA Cap CMOS LDO Regulator w/Power Good General Description Features The MIC5258 is an efcient, precise CMOS voltage regula- Power Good indicator tor with power good output. The MIC5258 offers better than Load independent, ultralow ground current: 100A 3% initial accuracy, and constant ground current (typically 150mA output current 100A)over load . Current limiting Thermal shutdown The MIC5258 also works with low-ESR ceramic capacitors, Tight load and line regulation reducing the amount of board space necessary for power Zero off-mode current applications, critical in hand-held wireless devices. Stability with low-ESR capacitors Key features include current limit, thermal shutdown, a push- Fast transient response pull output for faster transient response, and an active clamp to TTL-Logic-controlled enable input speed up device turnoff. Available in the IttyBitty SOT-23-5 package, the MIC5258 is a xed 1.2V regulator. Applications Processor power-up sequencing Laptop, notebook, and palmtop computers PCMCIA V and V regulation/switching CC PP Typical Application Part Number Junction Temp. Voltage Package Range* Standard Marking Pb-Free Marking MIC5258-1.2BM5 LN12 MIC5258-1.2YM5 KN12 1.2V 40C to +125C SOT-23-5 * Other voltages available. Contact Micrel marketing for information. Typical Application 47k MIC5258-x.xBM5 V V IN OUT 1 5 2 C OUT Enable 3 4 Shutdown PG EN EN (pin 3) may be connected directly to IN (pin 1). Low-Noise Regulator Application IttyBitty is a trademark of Micrel, Inc. Micrel, Inc. 2180 Fortune Drive San Jose, CA 95131 USA tel + 1 (408) 944-0800 fax + 1 (408) 474-1000 MIC5258 Micrel, Inc. Pin Conguration EN GND IN 3 2 1 LNxx KNxx 4 5 PG OUT MIC5258-x.xBM5/YM5 Pin Description Pin Number Pin Name Pin Function 1 IN Supply Input 2 GND Ground 3 EN Enable/Shutdown (Input): CMOS compatible input. Logic high = enable logic low = shutdown. Do not leave open. 4 PG Power Good Output 5 OUT Regulator Output MIC5258 2 April 2006