MIC5252 Micrel, Inc. MIC5252 150mA High PSRR, Low Noise Cap CMOS LDO General Description Features The MIC5252 is an efcient, precise CMOS voltage regulator Input voltage range: 2.7V to 6.0V optimized for ultra-low-noise applications. It offers 1% initial PSRR = 50dB V + 0.3V O accuracy, extremely-low dropout voltage (135mV at 150mA) Ultra-low output noise: 30V(rms) and low ground current (typically 90A). The MIC5252 Stability with ceramic output capacitors provides a very-low-noise output, ideal for RF applications Ultra-low dropout: 135mV 150mA where a clean voltage source is required. The MIC5252 has High output accuracy: a high PSRR even at low supply voltages, critical for battery 1.0% initial accuracy operated electronics. A noise bypass pin is also available for 2.0% over temperature further reduction of output noise. Low quiescent current: 90A Tight load and line regulation Designed specically for handheld and battery-powered TTL-Logic-controlled enable input devices, the MIC5252 provides a TTL-logic-compatible en- Zero off-mode current able pin. When disabled, power consumption drops nearly Thermal shutdown and current limit protection to zero. The MIC5252 also works with low-ESR ceramic capacitors, reducing the amount of board space necessary for power Applications applications, critical in handheld wireless devices. Cellular phones and pagers Key features include current limit, thermal shutdown, faster Cellular accessories transient response, and an active clamp to speed up device Battery-powered equipment turn-off. The MIC5252 is available in the 6-pin 2mm 2mm Laptop, notebook, and palmtop computers MLF package and the IttyBitty SOT-23-5 package in a Consumer/personal electronics wide range of output voltages. Typical Application V V OUT IN MIC5252-x.xBM5 V MIC5252-x.xBML V IN OUT C = 1.0F 1 5 IN ENABLE C 1 6 EN OUT SHUTDOWN Ceramic C BYP 2 (optional) C = 1.0F 2 5 OUT Enable 3 4 Ceramic Shutdown 3 4 EN EN (pin 3) may be C = 0.01F connected directly BYP to IN (pin 1). Ultra-Low-Noise Regulator Application IttyBitty is a registered trademark of Micrel, Inc. MicroLeadFrame and MLF are trademarks of Amkor Technology. Micrel, Inc. 2180 Fortune Drive San Jose, CA 95131 USA tel + 1 (408) 944-0800 fax + 1 (408) 474-1000 MIC5252 Micrel, Inc. Ordering Information Part Number Marking Voltage Junction Temp. Range Package Standard Pb-Free Standard Pb-Free MIC5252-1.8BM5 MIC5252-1.8YM5 L618 L618 1.8V -40C to +125C SOT-23-5 MIC5252-2.5BM5 MIC5252-2.5YM5 L625 L625 2.5V -40C to +125C SOT-23-5 MIC5252-2.8BM5 MIC5252-2.8YM5 L628 L628 2.8V -40C to +125C SOT-23-5 MIC5252-2.85BM5 MIC5252-2.85YM5 L62J L62J 2.85V -40C to +125C SOT-23-5 MIC5252-3.0BM5 MIC5252-3.0YM5 L630 L630 3.0V -40C to +125C SOT-23-5 MIC5252-4.75BM5 MIC5252-4.75YM5 L64H L64H 4.75V -40C to +125C SOT-23-5 MIC5252-2.8BML MIC5252-2.8YML 628 628 2.8V -40C to +125C 6-Pin 2x2 MLF MIC5252-2.85BML MIC5252-2.85YML 62J 62J 2.85V -40C to +125C 6-Pin 2x2 MLF MIC5252-3.0BML MIC5252-3.0YML 630 630 3.0V -40C to +125C 6-Pin 2x2 MLF Other voltages available. Contact Micrel for details. Pin Conguration EN GND IN 3 2 1 EN 1 6 BYP L6xx GND 2 5 NC 4 5 IN 3 4 OUT BYP OUT MIC5252-x.xBM5 MIC5252-x.xBML SOT-23-5 (M5) 6-Pin 2mm 2mm MLF (ML) (Top View) (Top View) Pin Description Pin Number Pin Number Pin Name Pin Function SOT-23-5 6-MLF 1 3 IN Supply Input. 2 2 GND Ground. 3 1 EN Enable/Shutdown (Input): CMOS compatible input. Logic high = enable logic low = shutdown. Do not leave open. 4 6 BYP Reference Bypass: Connect external 0.01F C 1.0F capacitor to BYP GND to reduce output noise. May be left open. 5 4 OUT Regulator Output. 5 NC No internal connection. EP GND Ground: Internally connected to the exposed pad. Connect externally to GND pin. M9999-020305 2 February 2005