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TC1221ECH Datasheet(PDF) 1 Page - Microchip Technology |
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TC1221ECH Datasheet(HTML) 1 Page - Microchip Technology |
1 / 16 page 2002-2014 Microchip Technology Inc. DS20001367C-page 1 TC1221/TC1222 Features: • Charge Pumps in 6-Pin SOT-23A Package • 96% Voltage Conversion Efficiency • Voltage Inversion and/or Doubling • Operates from +1.8V to +5.5V • Up to 25mA Output Current • Only Two External Capacitors Required • Power-Saving Shutdown Mode • Fully Compatible with 1.8V Logic Systems Applications: • LCD Panel Bias • Cellular Phones • Pagers • PDAs, Portable Data Loggers • Battery-Powered Devices Device Selection Table Package Type General Description: The TC1221/TC1222 are CMOS “charge-pump” voltage converters in ultra-small 6-Pin SOT-23A packages. They invert and/or double an input voltage which can range from +1.8V to +5.5V. Conversion efficiency is typically 96%. Switching frequency is 125 kHz for the TC1221, 750 kHz for the TC1222. When the shutdown pin is held at a logic low, the device goes into a very low power mode of operation, consuming less than 1 A of supply current. For standard voltage inverter applications, the device requires only two external capacitors. With a few additional components a positive doubler can also be built. All other circuitry, including control, oscillator, power MOSFETs are integrated on-chip. Typical supply currents are 290 A (TC1221) and 1800A (TC1222). All devices are available in 6-pin SOT-23A surface mount packages. Functional Block Diagram Part Number Package Osc. Freq. (kHz) Operating Temp. Range TC1221ECH 6-Pin SOT-23A 125 -40°C to +85°C TC1222ECH 6-Pin SOT-23A 750 -40°C to +85°C C+ C– TC1221ECH TC1222ECH 12 3 54 VIN SHDN GND 6-Pin SOT-23A NOTE: 6-Pin SOT-23A is equivalent to the EIAJ SC-74 OUT 6 TC1221 TC1222 VIN V– Output C+ C– C1 C2 Input GND OUT SHDN ON OFF + + Negative Voltage Inverter High-Frequency Switched Capacitor Voltage Converters with Shutdown in SOT Packages Obsolete Device |
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