I recently compared two similar 3V -> 5V boost circuits, the Sparkfun #08999 5V out @ 100 mA (based on NCP1400) and the Pololu #798 5V out @ 200 mA (based on NCP1402). http://www.sparkfun.com/products/8999http://www.pololu.com/catalog/product/798
The details are below, but the executive summary is: the Pololu 5V boost circuit module has 2x max current and it is cheaper, smaller, has lower noise, and is more efficient at every load current, as compared with the Sparkfun module.
(note: I regularly buy from both Sparkfun and Pololu, but have no other relationship to either company.)Sparkfun #8999
NCP1400 5V out 100 mA circuit. Measured at 3.2V input, resistive load:
Efficiency vs current out: 81% @ 25 mA, 67% @ 50 mA.
Noise on 5V, 50 mA out: 34mVrms, 300 mVpp (20 MHz BW) 40 mVrms, 600 mVpp (100 MHz BW).
With 5 V, 25 mA out: 18mVrms, 230 mVpp (20 MHz BW), 28 mVrms, 400 mVpp (100 MHz BW).
Current draw from 3.3V with no load: 1.2 mAPololu #798
NCP1402, 5V out, up to 200 mA with >2.7V in. Measured at 3.2V input, resistive load:
Efficiency vs. current out: 81% @4 mA, 84% @25 mA, 86% @50 mA.
Noise on 5V out: 10 mVrms, 50 mVpp in 20 MHz BW and 14 mVrms, 100 mVpp in 100 MHz BW
(independent of load current, over tested load range)
Ripple frequency variable, increases with load current:
5 kHz @ 4ma, 50 kHz @ 50 mA output. Vout: 5.004 V to 5.010 V (Vout increases with higher load).
(2nd unit tested, Vout= 4.98 V.)
Current draw from 3.3V with no load: 200 uA