Light-Management IC with Efficient 1x/1.5x/2x Charge Pump for Backlight/Flash/RGB LEDs
High-Efficiency Backlight and Flash Driver with Up to 400mA Flash Capability and 3 RGB Drivers with a Programmable RGB Ramp for Main, Sub, RGB, Keypad, or Flash Applications in a Compact, 4mm x 4mm TQFN Package
The MAX1707 provides complete light management for
main display backlight, subdisplay backlight (or RGB
indicator), and white LED camera flash with regulated
constant current up to 610mA total. By utilizing adaptive
1x/1.5x/2x charge-pump modes and very-low-dropout
current regulators, it achieves high efficiency
over the full 1-cell Li+ battery input voltage range. The
1MHz fixed-frequency switching allows for tiny external
components while the regulation scheme is optimized
to ensure low EMI and low input ripple. An integrated
derating function protects the LEDs from overheating
during high ambient temperatures.
The MAX1707 features an internally trimmed reference
to set the maximum LED current. An I²C serial port is
used for on/off control and setting the LED currents in
32 linear steps. When using the RGB indicator, the I²C
port provides 32k colors and programmable rampup/
down rates. The camera flash may be turned on/off
by the I²C port or a separate digital logic input.
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