如何提高CHARGE PUMP 的輸出電流能力?

sensing

請教板上各位高手,如何提高2X charge pump 在低輸入電壓下的輸出電流到100mA以上?

此時的輸出電壓還不致掉太低?

Vin=3V -> 2X CP -> Vo=4v 120mA

模擬時通常可以做到, 可是量測真正電路VO卻無法維持在高的電位. 還望各位解惑?

guonanxiang

增加開關頻率或者加大開關管尺寸
使得等效電壓源輸出電阻減小

seanyang1337

Dear sensing,
What's your charge pump's type? Is it using 3 PMOS and 1 NMOS??
And what's type capacitor you use?? X7R or Y5V ?? It's about ESR resistor.
It will reduce your Vout voltage.
Check the reference from SiTi's product DD211.
Maybe you will get you want.

sensing

Thanks for seanyang1337's suggestion.

My Charge Pump's type is the conventional 2X-mode.

I want to use this CP to produce high-current driving, while the Vout drops slowly as Iout increase.

I will study this reference from SiTi's product DD211, and confirm the type of Cap.