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MIC5245-3.3BMM Datasheet(PDF) 1 Page - Micrel Semiconductor |
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MIC5245-3.3BMM Datasheet(HTML) 1 Page - Micrel Semiconductor |
1 / 12 page MIC5245 Micrel August 2002 1 MIC5245 General Description The MIC5245 is an efficient, precise CMOS voltage regulator optimized for ultra-low-noise applications. The MIC5245 of- fers better than 1% initial accuracy, extremely low dropout voltage (typically 150mV at 150mA) and constant ground current over load (typically 100 µA). The MIC5245 provides a very low noise output, ideal for RF applications where quiet voltage sources are required. A noise bypass pin is also available for further reduction of output noise. Designed specifically for hand-held and battery-powered devices, the MIC5245 provides a TTL logic compatible en- able pin. When disabled, power consumption drops nearly to zero. The MIC5245 also works with low-ESR ceramic capacitors, reducing the amount of board space necessary for power applications, critical in hand-held wireless devices. Key features include current limit, thermal shutdown, a push- pull output for faster transient response, and an active clamp to speed up device turnoff. Available in the IttyBitty™ SOT-23-5 and power MSO-8 packages, the MIC5245 also offers a range of fixed output voltages. Not recommended for new designs, see MIC5255. Typical Application 15 2 3 4 COUT CBYP Enable Shutdown EN VOUT (optional) MIC5245-x.xBM5 EN (pin 3) may be connected directly o IN (pin 1). VIN MIC5245 150mA µCap CMOS LDO Regulator Final Information Features • Ultralow dropout—100mV @ 100mA • Ultralow noise—30 µV(rms) • Stability with tantalum or ceramic capacitors • Load independent, ultralow ground current • 150mA output current • Current limiting • Thermal Shutdown • Tight load and line regulation •“Zero” off-mode current • Fast transient response • TTL-Logic-controlled enable input Applications • Cellular phones and pagers • Cellular accessories • Battery-powered equipment • Laptop, notebook, and palmtop computers • PCMCIA V CC and VPP regulation/switching • Consumer/personal electronics • SMPS post-regulator/dc-to-dc modules • High-efficiency linear power supplies Ordering Information Part Number Marking Voltage Junction Temp. Range Package MIC5245-2.5BM5 LS25 2.5V –40 °C to +125°C SOT-23-5 MIC5245-2.7BM5 LS27 2.7V –40 °C to +125°C SOT-23-5 MIC5245-2.8BM5 LS28 2.8V –40 °C to +125°C SOT-23-5 MIC5245-2.85BM5 LS2J 2.85V –40 °C to +125°C SOT-23-5 MIC5245-3.0BM5 LS30 3.0V –40 °C to +125°C SOT-23-5 MIC5245-3.1BM5 LS31 3.1V –40 °C to +125°C SOT-23-5 MIC5245-3.2BM5 LS32 3.2V –40 °C to +125°C SOT-23-5 MIC5245-3.3BM5 LS33 3.3V –40 °C to +125°C SOT-23-5 MIC5245-3.3BMM — 3.3V –40 °C to +125°C MSOP-8 Other voltages available. Contact Micrel for details. Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com 1 2 3 4 8 7 6 5 MIC5245-3.3MM ENABLE SHUTDOWN CBYP (OPTIONAL) VIN VOUT COUT Ultra-Low-Noise Regulator Application |
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