Hi,
Is the 22uF maximum recommended output capacitance mainly due to start up issues, or is it likely that >22uF will cause stability issues also during load regulation (0/50mA)?
My 3.3V output rail will have more capacitance than the maximum 22uF recommended. However, another boost converter will initially charge my 200uF capacitance to 3.3V.
The TPS610986 will be used when my system is in deep-sleep (supplying a 6uA load current), and supply approx 50mA during boot. As soon as my system has booted another boost regulator will regulate my 3.3V rail and supply 500mA. The "high" current boost regulator will also take care of the capacitor charging during start up (charging of C, from "0V" to 3.3V).
If you believe this "dual" boost regulator approach to be a disputable design approach, I would be more than happy if you could advice another solution.
Design requirements:
Vin 1.5 - 3.1V, Vout 3.3V, Iout 6uA - 500mA, High efficiency at 6uA load and fast regulation at 500mA (short load pulses, WiFi TX) are required.
Regards
CHA
