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High current boost voltage regulator selection for battery powered device.

Discussion in 'Power Electronics' started by tightmopedman9, Sep 10, 2012.

  1. tightmopedman9

    tightmopedman9

    1
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    Sep 10, 2012
    I'm building a battery powered device which, at maximum, will consume 3A at 3.8V. I'd like to have the option to use 3-4 alkaline/NI-MH batteries or 2-4 lithium ion batteries. The first revision of my circuit used a buck regulator, however, the bootstrap voltage was set by a 5V LDO, meaning I had to have a Vin of at least 5V+.4V(dropout voltage). I've been looking at boost regulators, but am confused by their current ratings. Optimally, I'd like a package with external leads and Vin min of ~2.5V.

    I've been looking at the MIC2253: http://www.micrel.com/_PDF/mic2253.pdf, unfortunately, it only comes in an MLF package. I'm confused by the current ratings; it says 'minimum 3.5A switch current'. Does this mean that the device won't output power unless the load is drawing 3.5A or more?

    I've been searching everywhere and it seems like very few devices can offer such a high output current with such a low Vin.
     
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