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LM3641 driving 1.5A continuosly

Hi,

I'm looking for LED driver to drive 1 CREE XML-2 LED continuously at 1.5A like a torch light.

It's powered by a battery that provide Vin from 2.6V to 3.2V.

Please help to advise if LM3461 is a good selection and any care need to be taken on the PCBA layout for heat dissipation?

Thanks,

Kwan