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TC126503ECT bảng dữ liệu(PDF) 1 Page - Microchip Technology |
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TC126503ECT bảng dữ liệu(HTML) 1 Page - Microchip Technology |
1 / 12 page © 2002 Microchip Technology Inc. DS21372B-page 1 TC125/TC126 Features • Assured Start-up at 0.9V • PFM (100kHz Max Operating Frequency) •40 µA Maximum Supply Current (VOUT = 3V @ 30mA) •0.5 µA Shutdown Mode (TC125) • Voltage Sense Input (TC126) • Requires Only Three External Components • 80mA Maximum Output Current • Small Package: 5-Pin SOT-23A Applications • Palmtops/PDAs • Battery-Operated Systems • Cameras • Portable Communicators Device Selection Table *Other output voltages are available. Please contact Microchip Technology Inc. for details. Package Type General Description The TC125/126 step-up (Boost) switching regulators furnish output currents to a maximum of 80mA (VIN =2V, VOUT = 3V) with typical efficiencies above 80%. These devices employ pulse frequency modula- tion (PFM) for minimum supply current at low loads. They are ideal for battery-operated applications powered from one or more cells. Maximum supply current is less than 70 µA at full output load, and less than 5 µA in standby (VOUT = 3V). Both devices require only an external inductor, diode, and capacitor to implement a complete DC/DC regulator. The TC126 has separate output voltage sensing and chip power inputs for greater application flexibility. The TC125 combines the output voltage sensing and chip power inputs onto a single package pin, but adds a power-saving shutdown mode that suspends regulator operation and reduces supply current to less than 0.5 µA when the shutdown control input (SHDN)islow. The TC125/TC126 are available in a small 5-Pin SOT-23A package, occupy minimum board space and use small external components. The TC125 accepts input voltages from 2V to 10V. The TC126 accepts input voltages from 2.2V to 10V. Both the TC125 and TC126 have a start-up voltage of 0.9V at light load. Typical Application Part Number Output Voltage (V)* Package Operating Temp. Range TC125501ECT 5.0 5-Pin SOT-23A -40 °Cto +85°C TC125331ECT 3.3 5-Pin SOT-23A -40 °Cto +85°C TC125301ECT 3.0 5-Pin SOT-23A -40 °Cto +85°C TC126503ECT 5.0 5-Pin SOT-23A -40 °Cto +85°C TC126333ECT 3.3 5-Pin SOT-23A -40 °Cto +85°C TC126303ECT 3.0 5-Pin SOT-23A -40 °Cto +85°C 5-Pin SOT-23A NOTE: 5-Pin SOT-23A is equivalent to the EIAJ SC-74A VDD SENSE TC125 1 23 5 4 PS LX GND NC SHDN TC126 1 23 5 4 LX GND NC 3V 2 x "AA" Cell + – Two Cell to 5V Boost Regulator 1 2 3 5 4 TC125 LX SHDN NC PS GND MA735 + VIN Sumida 100 µH CD54 VOUT 5V @80mA 47 µF/16V Tantalum PFM Step-Up DC/DC Regulators |
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