MIC5245 Micrel MIC5245 150mA Cap CMOS LDO Regulator Final Information General Description Features The MIC5245 is an efficient, precise CMOS voltage regulator Ultralow dropout100mV 100mA optimized for ultra-low-noise applications. The MIC5245 of- Ultralow noise30 V(rms) fers better than 1% initial accuracy, extremely low dropout Stability with tantalum or ceramic capacitors voltage (typically 150mV at 150mA) and constant ground Load independent, ultralow ground current current over load (typically 100 A). The MIC5245 provides a 150mA output current very low noise output, ideal for RF applications where quiet Current limiting voltage sources are required. A noise bypass pin is also Thermal Shutdown available for further reduction of output noise. Tight load and line regulation Zero off-mode current Designed specifically for hand-held and battery-powered Fast transient response devices, the MIC5245 provides a TTL logic compatible en- TTL-Logic-controlled enable input able pin. When disabled, power consumption drops nearly to zero. Applications The MIC5245 also works with low-ESR ceramic capacitors, Cellular phones and pagers reducing the amount of board space necessary for power Cellular accessories applications, critical in hand-held wireless devices. Battery-powered equipment Key features include current limit, thermal shutdown, a push- Laptop, notebook, and palmtop computers pull output for faster transient response, and an active clamp PCMCIA V and V regulation/switching CC PP to speed up device turnoff. Available in the IttyBitty SOT-23-5 Consumer/personal electronics and power MSO-8 packages, the MIC5245 also offers a SMPS post-regulator/dc-to-dc modules range of fixed output voltages. High-efficiency linear power supplies Not recommended for new designs, see MIC5255. Ordering Information Part Number Marking Voltage Junction Temp. Range Package MIC5245-2.5BM5 LS25 2.5V 40C to +125C SOT-23-5 MIC5245-2.7BM5 LS27 2.7V 40C to +125C SOT-23-5 MIC5245-2.8BM5 LS28 2.8V 40C to +125C SOT-23-5 MIC5245-2.85BM5 LS2J 2.85V 40C to +125C SOT-23-5 MIC5245-3.0BM5 LS30 3.0V 40C to +125C SOT-23-5 MIC5245-3.1BM5 LS31 3.1V 40C to +125C SOT-23-5 MIC5245-3.2BM5 LS32 3.2V 40C to +125C SOT-23-5 MIC5245-3.3BM5 LS33 3.3V 40C to +125C SOT-23-5 MIC5245-3.3BMM 3.3V 40C to +125C MSOP-8 Other voltages available. Contact Micrel for details. Typical Application MIC5245-3.3MM ENABLE 1 8 MIC5245-x.xBM5 SHUTDOWN V V IN OUT 15 V 2 7 IN 2 3 6 C OUT V OUT 3 4 Enable 4 5 Shutdown EN C BYP C BYP EN (pin 3) may be (optional) connected directly C (OPTIONAL) OUT o IN (pin 1). Ultra-Low-Noise Regulator Application Micrel, Inc. 1849 Fortune Drive San Jose, CA 95131 USA tel + 1 (408) 944-0800 fax + 1 (408) 944-0970 MIC5245 Micrel Pin Configuration EN GND IN 3 2 1 EN 1 8 GND IN 2 7 GND LSxx OUT 3 6 GND 45 BYP OUT BYP 4 5 GND MIC5245-x.xBM5 8-Pin MSOP (BMM) Pin Description Pin Number Pin Number Pin Name Pin Function Power MOS-8 SOT-23 2 1 IN Supply Input 58 2 GND Ground 1 3 EN Enable/Shutdown (Input): CMOS compatible input. Logic high = enable logic low = shutdown. Do not leave open. 4 4 BYP Reference Bypass: Connect external 0.01 F capacitor to GND to reduce output noise. May be left open. 3 5 OUT Regulator Output Absolute Maximum Ratings (Note 1) Operating Ratings (Note 2) Supply Input Voltage (V ) .................................. 0V to +7V Input Voltage (V ) ......................................... +2.7V to +6V IN IN Enable Input Voltage (V ) .................................. 0V to V Enable Input Voltage (V ) ................................. 0V to +7V EN IN EN Junction Temperature (T ) ....................... 40C to +125C J Junction Temperature (T ) ...................................... +150C J Thermal Resistance Storage Temperature ............................... 65C to +150C SOT-23 ( ) .....................................................235C/W JA Lead Temperature (soldering, 5 sec.) ....................... 260C MSOP-8 ( ) ......................................................80C/W JA ESD, Note 3 MIC5245 2 August 2002