The MAX1577Y/MAX1577Z charge pumps drive white
LEDs, including camera strobes, with regulated current
up to 1.2A (guaranteed to 800mA). The very low openloop
output resistance allows high flash brightness,
even from a low battery input voltage. The adaptive
1x/2x regulating charge-pump operation provides high
efficiency (up to 92%) while in movie mode or backlighting.
Fast (1MHz) switching allows the use of tiny
external components.
The MAX1577Y/MAX1577Z use an external resistor to
set the full-scale LED current. Two enable inputs (EN1
and EN2) provide simple on/off control and LED current
of 20%, 33%, or 100% full scale. If there is less than
24mV across the external resistor, the output voltage is
regulated. The MAX1577Z has fixed 5.1V output-voltage
regulation, while the MAX1577Y has logic-controlled
output voltage of 3.4V, 4.6V, or 5.1V for
backlighting, keyboard, and RGB applications.
The MAX1577Y/MAX1577Z are available in an 8-pin,
3mm x 3mm TDFN package (0.8mm max height).
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