MIC5247 Micrel, Inc. MIC5247 150mA Low-Voltage Cap Linear Regulator General Description Features The MIC5247 is an efcient and precise, low-voltage CMOS Ultra-low noise voltage regulator optimized for ultra-low noise applications. Low-voltage outputs The MIC5247 offers better than 1% initial accuracy and Load independent, ultra-low ground current: 85A 85A constant ground current over load (typically 85A). 150mA output current The MIC5247 provides a very low-noise output, ideal for Current limiting RF applications where quiet voltage sources are required. Thermal shutdown A noise bypass pin is also available for further reduction of Tight load and line regulation output noise. Zero off-mode current Stability with low-ESR capacitors Designed specically for handheld and battery-powered de- Fast transient response vices, the MIC5247 provides a logic compatible enable pin. Logic-controlled enable input When disabled, power consumption drops nearly to zero. The MIC5247 also works with low-ESR ceramic capacitors, Applications reducing the amount of board space necessary for power Cellular phones and pagers applications, critical in handheld wireless devices. Cellular accessories Key features include current limit, thermal shutdown, a push- Battery-powered equipment pull output for faster transient response, and an active clamp Laptop, notebook, and palmtop computers to speed up device turnoff. Available in the 6-pin 2mm 2mm PCMCIA V and V regulation/switching CC PP MLF package and the IttyBitty SOT-23-5 package, the Consumer/personal electronics MIC5247 also offers a range of xed output voltages. SMPS post-regulator/DC-to-DC modules High-efciency linear power supplies All support documentation can be found on Micrels web site at www.micrel.com. Typical Application V V MIC5247-x.xBM5 OUT IN V V MIC5247-x.xBML IN OUT 1 5 ENABLE C 1 6 OUT EN SHUTDOWN C 2 BYP C OUT (optional) 2 5 3 4 Enable Shutdown 3 4 EN C BYP EN (pin 3) may be (optional) connected directly to IN (pin 1). Ultra-Low-Noise Regulator Application Micrel, Inc. 2180 Fortune Drive San Jose, CA 95131 USA tel + 1 (408) 944-0800 fax + 1 (408) 474-1000 MIC5247 Micrel, Inc. Ordering Information Part Number Junction Voltage* Package Temp. Range Standard Marking Pb-Free Marking** MIC5247-1.5BM5 LU15 MIC5247-1.5YM5 LU15 1.5V 40C to +125C SOT-23-5 MIC5247-1.6BM5 LU16 MIC5247-1.6YM5 LU16 1.6V 40C to +125C SOT-23-5 MIC5247-1.8BM5 LU18 MIC5247-1.8YM5 LU18 1.8V 40C to +125C SOT-23-5 MIC5247-1.85BM5 LU1J MIC5247-1.85YM5 LU1J 1.85V 40C to +125C SOT-23-5 MIC5247-2.0BM5 LU20 MIC5247-2.0YM5 LU20 2.0V 40C to +125C SOT-23-5 MIC5247-2.1BM5 LU21 MIC5247-2.1YM5 LU21 2.1V 40C to +125C SOT-23-5 MIC5247-2.2BM5 LU22 MIC5247-2.2YM5 LU22 2.2V 40C to +125C SOT-23-5 MIC5247-2.4BM5 LU24 MIC5247-2.4YM5 LU24 2.4V 40C to +125C SOT-23-5 MIC5247-1.8BD5 NU18 MIC5247-1.8YD5 NU18 1.8V 40C to +125C Thin SOT-23-5 MIC5247-2.0BD5 NU20 MIC5247-2.0YD5 NU20 2.0V 40C to +125C Thin SOT-23-5 MIC5247-1.5BML U15 MIC5247-1.5YML U15 1.5V 40C to +125C 6-Pin 2mm x 2mm MLF MIC5247-1.6BML U16 MIC5247-1.6YML U16 1.6V 40C to +125C 6-Pin 2mm x 2mm MLF MIC5247-1.8BML U18 MIC5247-1.8YML U18 1.8V 40C to +125C 6-Pin 2mm x 2mm MLF MIC5247-1.85BML U1J MIC5247-1.85YML U1J 1.85V 40C to +125C 6-Pin 2mm x 2mm MLF * Other voltage options available, please contact Micrel Marketing for details. ** Over and under bar ( ) ( ) symbols may not be to scale. Pin Conguration EN GND IN 6 BYP EN 1 3 2 1 LUxx/ GND 2 5 NC NUxx 4 OUT IN 3 4 5 BYP OUT MIC5247-x.xBML / YML MIC5247-x.xBM5 / YM5 6-Pin 2mm 2mm MLF (ML) MIC5247-x.xBD5 / YM5 (Top View) (Top View) Pin Description Pin Number Pin Number Pin Name Pin Function SOT-23-5 MLF-6 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 0.01pF capacitor to 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 to ground pin. M9999-022406 2 February 2006