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TC1683EUA Arkusz danych(PDF) 1 Page - Microchip Technology |
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TC1683EUA Arkusz danych(HTML) 1 Page - Microchip Technology |
1 / 10 page 2002 Microchip Technology Inc. DS21537B-page 1 M TC1682/TC1683/TC1684 Features • Small 8-Pin MSOP Package • Operates from 1.8V to 5.5V • 120 Ohms (typ) Output Resistance • 99% Voltage Conversion Efficiency • Only 3 External Capacitors Required • Power-Saving Shutdown Mode • Low Active Supply Current -95 µA (typ) for TC1682 -225 µA (typ) for TC1683 -700 µA (typ) for TC1684 • Fully Compatible with 1.8V Logic Systems Applications • LCD Panel Bias • Cellular Phones PA Bias • Pagers • PDAs, Portable Data Loggers • Battery-Powered Devices Device Selection Table Package Type General Description The TC1682/TC1683/TC1684 are CMOS charge pump converters that provide an inverted doubled output from a single positive supply. An on-board oscillator provides the clock and only three external capacitors are required for full circuit implementation. Switching frequencies are 12kHz for the TC1682, 35kHz for the TC1683, and 125kHz for the TC1684. When the SHDN pin is held at a logic high, the device goes into a very low power mode of operation consuming less than 1 µA (typ) of supply current. Low output source impedance (typically 120 Ω), provides output current up to 10mA. The TC1682/ TC1683/TC1684 feature a 1.8V to 5.5V operating voltage range and high efficiency, which make them an ideal choice for a wide variety of applications requiring a negative doubled voltage derived from a single positive supply (for example: generation of -7.2V from a +3.6V lithium cell or -10V generated from a +5V logic supply). The minimum external part count, small physical size and shutdown mode feature make this family of products useful for a wide variety of negative bias power supply applications. Functional Block Diagram Part Number Package Osc. Freq. (kHz) Operating Temp. Range TC1682EUA 8-Pin MSOP 12 -40°C to +85°C TC1683EUA 8-Pin MSOP 35 -40°C to +85°C TC1684EUA 8-Pin MSOP 125 -40°C to +85°C 1 2 3 4 8 7 6 5 TC1682 TC1683 TC1684 VOUT SHDN VIN C2– GND C1– C1+ C2+ 8-Pin MSOP C1+ C2+ VIN C1– C2 C2– C1 TC1682 TC1683 TC1684 VOUT + + + – C OUT Input GND C1 must have a voltage rating ≥ VIN C2 and COUT must have a voltage rating ≥ 2VIN VOUT = -(2 x VIN) SHDN ON OFF Inverting Charge Pump Voltage Doublers with Active High Shutdown |
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