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TPS61046: Can I use this IC under specific condition?

Chase Jeong
Genius 4660 points
Part Number: TPS61046
Other Parts Discussed in Thread: TPS61251, TPS61086, TPS61093, LM2623, LM5157, TLV61048, TPS61087, TPS61022, TPS61288

Hello TI experts,

I am going to suggest TPS61046 to my customer, please check their condition.

input : 1.9V ~ 3V

output : 13V, under 900mA

i thought that I can use this, but in webench I cannot simulate with this condition.

(especially I cannot set the current over 0.6A)

please check this issue. Thanks.

Best regards,

Chase

  • 0
    TI__Expert 5180 points

    Hi Chase,

    TPS61046 cannot output 900mA current, because its typical peak current limit is 900mA which is inductor current related to input current. How about TPS61086, TPS61093 or TPS61251? Please watch out the inductor current ripple to avoid hit peak current limit. 

    Best Regards,

    Eric Yue

  • 0 in reply to Eric Yue
    Genius 4660 points

    Hi Eric,

    Thank you for your reply.

    - TPS61086 : minimum input voltage is 2.3V -> exceeded

    - TPS61093 : cannot simulate on webench under my condition (please confirm)

    - TPS61251 : maximum output voltage is 6.5V (too small)

    also I found LM2623 from the site. Can I use it normally for my purpose?

    input : 1.9V ~ 3V

    output : 13V, under 900mA

    Best regards,

    Chase

  • 0 in reply to Chase Jeong
    TI__Expert 5180 points

    Hi Chase,

    Sorry for mistaken working condition.

    For such high output/input voltage ratio and large load current, we don't have suitable and cheap chip. LM5157 can meet the needs, but it is Automotive and not cheap. How about reduce lower input to 2V and start-up voltage to 2.4V, TPS61288 can be used. Or you may try Two-level topology, e.g. with TPS61022+TLV61048/TPS61087.

    BTW may I ask what is customer's application for such working condition?

    Best Regards,

    Eric Yue

  • 0 in reply to Eric Yue
    Genius 4660 points

    Hi Eric,

    Thank you for your reply.

    I checked TPS61288 on webench, it works great under 2V~3V input.

    and actually I have a question about such a high output range. I asked that do they really need high voltage output.

    unfortunately i did not receive an answer yet, I will share you as soon as possible. Thanks.

    Best regards,

    Chase

  • 0 in reply to Chase Jeong
    TI__Expert 5180 points

    Hi Chase,

    Please let me know if there is any process or need anything from my side.

    Wish you will have a good week.

    Best Regards,

    Eric Yue