Hi Zai,
Check out this reference design which charges a super cap with 360 nA Iq: http://www.ti.com/tool/PMP9753
On the TPS62770, the LOAD switch just connects the buck output to the LOAD pin. You can see this in Figure 4.
Hi Bidault,
Did you already look at this reference design on the TPS62740 product page? It looks exactly like what you describe: http://www.ti.com/tool/PMP9753
There isn't such a low Iq device which gives a higher Vout, so you'll need to use 3.3V or…
The leakage of the super cap can be considered as an extra load on the device. This draws more input power.
This reference design shows one way that the device can be used like this: http://www.ti.com/tool/PMP9753
Can you post a D/S of the exact cell you will use? Many cells of this type go under 3V when cold, etc.
Would this reference design be applicable to your application: http://www.ti.com/tool/PMP9753
it is no problem for TPS61030 to support 4.2V input voltage. We also have TPS61230 and TPS61280(CSP package) that can also support you application. you can search PMP9753 about the TPS61280 to drive a GSM module. (note: please use TPS61280A in new design…
Thanks for explaining.
Is it possible to modify your test setup so that the FB pin is not driven so far away from its typical operating point? Driving it just ~10mV from 0.6V should be all that is needed to start or stop switching.
For example, keeping…
Ah, it's two different systems. That makes more sense :)
For #1, there are many ways to do this depending on the required/allowed voltage at the load. A buck-boost has relatively high Iq, but if it can be turned on only when needed, this doesn…
Yes, a lithium battery is one way to store or buffer the energy in the alkaline, but a super cap is another way. This will likely be cheaper and safer. Here is a TI Design around this concept: http://www.ti.com/tool/PMP9753
Charging a lithium battery…
