TPS610981: Most efficient boost chip for bluetooth low energy

Davido Hyer23

Part Number: TPS610981
Other Parts Discussed in Thread: TLV61225, TPS61098,

I'm looking at the TPS610985X family of chips and am having some trouble figuring out which is best to use. My average load current is about 20 uA, peak current is 10 mA. I'm running my board off of a single AA battery and would like to keep it running as long as possible (down to a dead battery), so somewhere in the 0.7 to 0.8 voltage range would be nice. Since my input voltage is so low, I don't need the LDO so can disable that for extra energy savings. Which chip in the TPS610985X family would be best for this scenario? I already tried the TLV61225, but it seemed to have much too high of a current draw at low input voltage levels.

over 4 years ago

0 Minqiu Xie over 4 years ago

TI__Mastermind 21565 points

HI Davido:

What's the output voltage do you want? And it's single channel, right?

0 Davido Hyer1 over 4 years ago in reply to Minqiu Xie

Prodigy 20 points

Single channel, and the bluetooth chip can accept voltages from 1.7-3.6 volts. However, I'm going for low power, and the bluetooth chip draws less power when running from higher voltages, so either 3 volts or 3.3 volts would be ideal.

0 Minqiu Xie over 4 years ago in reply to Davido Hyer1

TI__Mastermind 21565 points

Hi Davido:

Sorry that I'm out of office without computer. May you search the E2E by your self about "TPS61098"? I remenber that I support one similiar post, and I supply some data. It should be useful for you.

Or you can wait for me back next week. Thanks for you understanding.

0 Minqiu Xie over 4 years ago in reply to Minqiu Xie

TI__Mastermind 21565 points

Hi Davido：

Thanks for your waiting. Please check the details in this post.

0 Davido Hyer1 over 4 years ago in reply to Minqiu Xie

Prodigy 20 points

If you sent a link to a post, I think you forgot to attach the link to the post. Thanks.

0 Minqiu Xie over 4 years ago in reply to Davido Hyer1

TI__Mastermind 21565 points

Oh sorry, my bad. Here has the efficiency below LDO or switch function:

e2e.ti.com/.../3471152

0 Minqiu Xie over 4 years ago in reply to Minqiu Xie

TI__Mastermind 21565 points

And here is some data for low Vin:

Test on TPS610981, Mode=Low

NFC - Iout uA	NFC - Temp	NFC - Vin V	NFC - Vout V	Efficiency
10	25	0.7	3.3	78.0724
100	25	0.7	3.3	80.425
10,000	25	0.7	3.3	86.2406
10	25	10	3.3	81.3986
100	25	10	3.3	84.4863
10,000	25	10	3.3	88.1989

Because of the holidays, TI E2E™ design support forum responses will be delayed from Dec. 25 through Jan. 2. Thank you for your patience.

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TPS610981: Most efficient boost chip for bluetooth low energy