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TC115501EMTTR Folha de dados(PDF) 1 Page - Microchip Technology |
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TC115501EMTTR Folha de dados(HTML) 1 Page - Microchip Technology |
1 / 14 page 2002-2012 Microchip Technology Inc. DS21361D-page 1 TC115 Features • High Efficiency at Low Output Load Currents via PFM Mode • Assured Start-up at 0.9V • 80 µA (Typ) Supply Current • 85% Typical Efficiency at 100 mA • 140 mA Typical Output Current @ VIN 2.0V • Low Power Shutdown Mode • No External Switching Transistor Needed • Space-Saving SOT-89 Package Applications • Pagers • Cellular Phones •Palmtops • 1-Cell to 3-Cell Battery Powered Systems • Cameras, Video Recorders • Local +3V to +5V Supplies Package Type General Description The TC115 is a high-efficiency step-up DC/DC converter for small, low input voltage or battery- powered systems. This device has a start-up voltage of 0.9V and a typical supply current of 80 µA. Phase compensation and soft-start circuitry are included on- chip. Unlike conventional PWM step-up converters, the TC115 automatically shifts to pulse frequency modulation (PFM) at low loads, resulting in reduced supply current and improved efficiency. The TC115 requires only an external diode, an inductor and a capacitor, while supporting typical output cur- rents of 140 mA. Supply current is reduced to less than 0.5 µA (max) when SHDN input is brought low. Small size, low installed cost and low supply current make the TC115 step-up converter ideal for use in a wide range of battery-powered systems. Functional Block Diagram 5 4 TC115 1 3 2 GND LX NC PS SHDN SOT-89-5 PS 1.5V C1 10 µF L1 100 µH Sumida® CD-54 1.5V to +3V, 50 mA Supply 5 4 TC115 1 3 2 SHDN PS NC C2 47 µF Tantalum IN5817 D1 GND LX +3V OUT + + + PS PFM/PWM Step-Up DC/DC Converter |
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