I am about to build voltage booster (1.5V battery to 3.3V) with NCP1402.
Datasheet recommends 68μF tantalum or two 22μF capacitors for output. Schematic looks like this:
Output capacitor should have low ESR (page 16):
The output capacitor is used for sustaining the output voltage when the internal MOSFET is switched on and smoothing the ripple voltage. Low ESR capacitor should be used to reduce output ripple voltage. In general, a 47 μF to 68 μF low ESR (0.15 Ω to 0.30 Ω) Tantalum capacitor should be appropriate. For applications where space is a critical factor, two parallel 22 μF low profile SMD ceramic capacitors can be used.
I have smd ceramic 22μF caps, but I do not know whether they are suitable or not. I measured ESR of those caps with LCR meter:
8.30Ω @100Hz 0.63Ω @1kHz 0.04Ω @10kHz 0.04Ω @100kHz
ESR is fine for frequencies over 10kHz. But it is larger than recommended value at 1kHz and lower.
Is this capacitor suitable? Is it possible to ignore higher ESR at lower frequencies? Should I buy different/better caps?