Forum Post: RE: TPS61251 problem in 100% duty cycle mode

1. Adding an LDO & increasing the output  by 200mV will decrease the Battery life by 6% without consider the currents.
2. I need a system that will give me about 60uA in standby & about 300mA in some operating modes.
   1. I don't know such LDO with Iq of several uA or less, I will be glad if you have such part.
3.  Even in 300mA mode it will not always mean that the dc2dc will work in boost mode (depending with temperature and battery life).
4. I don't understand how the output will remain in steady voltage with such changes in the current, unless the FB of the dc2dc will receive the output of the LDO, and in such case I'm losing the LDO PSRR.
5. Adding an LDO mean new board, more space, more money (our application is very sensitive to space & money.

Can't the TPS61251 work according to his datasheet ???

We manage to work with it now with minimum effect on our RF.

Thanks in any case for the support.