一种单片低功耗电荷泵电源管理电路的设计

Design of Low-Power Charge-Pump Power Management IC

基于0.6μm BiCMOS工艺,设计了一款高精度电荷泵电源管理芯片。该芯片利用2倍压电荷泵电源转换原理,芯片内部集成了具有优异频率响应的振荡器电容,施密特触发器提供内部精准频率,PFM调制提供稳定的输出电压。测试结果表明,芯片输入电压范围为2.7～5.5V,输出电压为5V,电压纹波小于20mV,内部振荡频率为700kHz,低功耗模式时电流仅为6.73μA。

Based on the principle of 2 times charge-pump converter,a high precision charge pump power management IC was designed using BiCMOS process,which contained an oscillator capacitor with excellent frequency response,a Schmitt trigger providing precise internal frequency and PFM for stable output.Simulation results showed that the circuit had an output voltage of 5 V,a ripple voltage less than 20 mV and an internal oscillating frequency of 700 kHz for an input voltage between 2.7 V and 5.5 V,and the current dropped to 6.73 μA in low power mode.