MC1121 100mA Charge Pump Voltage Converter with Shutdown The MC1121 is a charge pump converter with 100mA output current capability.
It converts a 2.
4V to 5.
5V input to a corresponding negative output voltage.
As with all charge pump converters, the MC1121 uses no inductors saving cost, size, and reducing EMI.
An on–board oscillator operates at a typical frequency of 10kHz (at VDD = 5V) when the frequency control input (FC) is connected to ground.
The oscillator frequency increases to 200kHz when FC is connected to VDD, allowing the use of smaller capacitors.
Operation at sub–10kHz frequencies results in lower quiescent current and is accomplished with the addition of an external capacitor f...

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