AN974| Application Note
POWER-SUPPLY CIRCUITS
Oct 01, 1996
Discrete Charge Pump Adds -12V Output to +12V Boost Converter
A discrete-component external charge pump enables the PFM-controlled DCDC converter of Figure 1 to generate dual outputs with moderate regulation and high efficiency. The circuit accepts input voltages between 2V and 12V (typically 5V) and delivers simultaneous 0mA to 100mA outputs at 12V (Figure 2). Efficiencies range between 80% and 90%.
A discrete-component external charge pump enables the PFM-controlled dc-dc converter of Figure 1 to generate dual outputs with moderate regulation and high efficiency. The circuit accepts input voltages between 2V and 12V (typically 5V) and delivers simultaneous 0mA to 100mA outputs at 12V (Figure 2). Efficiencies range between 80% and 90%.
Figure 1. An external charge pump (C3, C5, D1, and D3) enables this dc-dc step-up converter to generate 12V dual outputs.
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