> AOZ1051

That's rather good for the money (US sourced).
$0.91/1 , $0.36/1000

Synchronous rectification.
0.8V feedback level - lower the better if using as a current source
(not in this case).
500 kHz
Reasonable switch Rdson - not stunning (70 mohm hi, 40 mohm low)
Cycle by cycle current limit (uses high side synchronous rectifier
MOSFET Rdson as Rsense so adds no losses that are not already there.
Thermally protected.
Short circuit protected.

Vinmin of 4.5V is a shame - too high.
Vin lockout at 4.1V rising and 3.7V falling.
This makes it poor to useless for LiIon 1 cell and useless for LiFePO4
1 cell and needs 5 x NimH to operate properly in spec.
They could easily have given it a lower startup voltage - even if it
ha to bootstrap its own supply before it could handle any load.
Internal output FETs Vgsth probably an issue.

Should give around 90% efficiency in envisaged application.


   Russell McMahon
--=20
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