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TPS6122x -- Minimizing Iq

Rob Rodrigues
Mastermind 19780 points
Other Parts Discussed in Thread: TPS61221, TPS61222

Hi Team,

I am trying to minimize queiscent current as much as possible in an application where a TPS61221 and TPS61222 are used to boost a single cell NiMH battery (1.5-V) up to 3.3-V.  The 3.3-V rail will then be boosted to 5-V.  This is a battery powered application so queiscent current is the chief concern here because of a low duty cycle.

 

Do the surrounding biasing components, specifically C1, C2 and L1 in the simplified schematic in the data sheet, effect Iq significantly?  The load will be using very low current, should L1 be selected to reduce or increase the switching frequency to optimize this application?

 

  • 0
    TI__Intellectual 1305 points

    Hi Rob,

    Changing external components doesn't help to reduce Iq, but changing L1 would change the switching frequency then leading to different power consumption. The recommended value of L1 is 4.7uH, changing to 10uH will lower the switching frequency and reduce switching power loss. Taking care for the DCR of 4.7uH and 10uH inductors when doing efficiency comparison.

    BR

    Gene