WEBENCH® Tools/LMR64010: LMR64010 for a reference

Hi,

What's the specific low power consumption demand? Please check TPS65235 to see whether it could meet. Thanks.

Hi,

The battery long life depending on low transition of current in time.

We think that when the step up boost is on, the current won't be higher then 80mA and the power consumption will be about 30mA/H.

The step up boost working time can be between 2 sec to 8 sec to charge the capacitor 4700uF from Vin 5-12VDC  to Vout - 16VDc.

Your step up boost are good for quick stability output voltage and current supply.
In my case I need very low power consumption I don't mind that it will take time.

I already seen the TPS65235 and I think it's the same behavior like the others.

Thanks,

Hi,

TPS65235 is the lowest Iq boost converter that can support 16Vout. I'm not sure what specific Iq you need to meet your demand and whether it could work for you. Thanks.   

hi Ofri,

please check if TPS61040 is good for your applicaiton. this device is only 28uA IQ.

the VIN pin of the IC is less than 7V, so it need a 5V rail to power the VIN pin. while the 5V~12V is connected to inductor.

Hi Li,
I am looking for step up boost that will take minimum current from the batteries.
The input voltage for the boost 6-12VDc and the output voltage 16VDc.
The average current shall be 30 mAmp/h and the output it's a capacitor of 4700uF.
The time to charge the capacitor for the 12VDc to 16VDc about 2 sec and for the 6VDc to 16VDc about 8 sec.

I guess that the boost switching frequency it's between 10kHz to 100kHz.

This will giving you a long life for the batteries.

Do you have any component that can perform this?

For Example controlling of the switching frequency.

Thanks,

Hi Ofri,

About charge time, do you mean it cannot be shorter than your spec? If you need smaller charge current, TPS61041 supports 250mA max output current will be better.

And about switching frequency, when under light load operation, our device will enter PFM mode, the switching frequency will be much lower to reduce power consumption.

Besides, the VIN pin of the IC is less than 7V so it need a 5V rail like LDO or Zenner to power the VIN pin, while the 5V~12V is connected to inductor. If you could accept this, TPS61041 will be a good option for you. 

Thanks.

Hi Zhao,

Yes,
I need it to be charge to 16VDc not less than 1.5 sec when Vin=12VDc,

and about 8 sec when Vin=5VDc, and I prefer that the Vin to the boost will be between 5 to 12VDc.

That is for consuming a low current from the batteries.

Thanks,

Hi Ofri,

Based on your spec, you need to limit input current to 30mA. And I'm confused with your long charge time demand, since whether charge current large or small you still need the same charge energy so why need long charge time? And what's the meaning of average current shall be 30 mAmp/h? Normally the battery volume unit is mAh.

TPS61041 is the lowest Iq and lowest current limit device we have, however it's input is 1.8-6V. It's the most proper device we have.

Hi,

Please look at this link: 

Hi Ofri,

Yes, I understand why low current is needed. If you need lower current limit, please refer to an additional input current limit circuit here http://www.ti.com/lit/an/slva912/slva912.pdf , with TPS61041 for its low Iq, so you can adjust the limit point based on your need.

However, it may add some devices. You can select a low Iq and cheaper amplifier if you don't need accurate current limit like INA138 did. You have to trade off these features you need.

Hi,

We don't have boost converter with such low current limit, however you can refer to an additional input current limit circuit here http://www.ti.com/lit/an/slva912/slva912.pdf , with TPS61041 for its low Iq. That's the best solution we can provide.