Pretty decent – 2-Port USB Power Car Adapter (with Safety Circuitry) Reviews
posted by cctsmaster on 07/20/2009
Involvement:Expert (understands the inner workings) - Ownership:1 day to 1 week
* Decent size
* Wide input range
* Switchmode regulator, not linear
* Reasonably low noise on output
* Fused (2A) in case something goes wrong
* Works down to 6-7 volts, has about 0.9 volts dropout.
* Bit out of specs; 5.1 v @ no load, 5.7(!)v @ 350mA load, 5.3v @ 600 mA load
* Somewhat low efficiency, 72% @ 350mA, 79% @ 600 mA. I don't recommend running it at full load (800 mA; this will likely get very unhappy at 2x800mA) for prolonged periods.
* Somewhat shoddy build quality
It should be noted that it drags both D+ and D- (the data pins) to ~2.6 volts. This seems intentional; I can't quite see why but I imagine some devices are finicky about what they're connected to.
I'd buy another if I needed it, but might end up swapping out the parts in it for something more robust. Don't keep it on a high load for hours and hours, and you'll be fine.
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