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2022-09-24 23:32:00
TC1121 - 100mA Charge Pump Voltage Converter with Shutdown
The TC1121 is a charge pump converter and provides 100mA output current capability. It translates the 2.4V to 5.5V input to the corresponding negative output voltage. As all charge pump converters, the TC1121 does not use an inductor saving cost, size and EMI. The on-board oscillator operates at a typical frequency of 10kHz (V+=5V) when the frequency control input (FC) is connected to ground. The frequency of the oscillator, FC, is increased to 200kHz when connected to V+, allowing the use of smaller capacitors. When operating at a lower quiescent frequency of 10kHz results in NScurrent and is done with another (pin 7) external capacitor from OSC to ground. "The TC1121 can also drive NSconnected oscillators from an external clock. Typical supply current is 50µA at 10kHz, dropping below 1µA during shutdown. The input is brought low, whether it is an internal or external clock. The TC1121 is in an 8-pin SOIC, MSOP and PDIP packages.
Applications • Notebooks • Medical Devices • Disk Drives • Microprocessor-Based Controllers • Process Instrumentation