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The MAX8608Y/MAX8608Z dual LED drivers use a single
inductor to provide two outputs for either organic
LED (OLED) power or white LED (WLED) drive in dual-display
cell phones. Each output can be configured for
either voltage regulation (adjustable up to 26V) for OLED
or current regulation (adjustable up to 40mA) for WLED.
The topology integrates a single 1MHz/500kHz PWM
step-up converter and two output load switches to minimize
size and external components and maximize efficiency.
Each output (OUTA, OUTB) is enabled by
individual logic inputs for simplicity; however, if ENA is
high, ENB is overridden and OUTB becomes disabled.
A single CTRL input accepts either an analog or direct-
PWM dimming signal for proportional control of the output
voltage or current. Internal lowpass filtering
eliminates the need for any external filters at CTRL
while maintaining low input and output ripple under all
conditions.
The MAX8608Y features a TA derating function to avoid
overdriving the LEDs during high ambient temperatures,
enabling higher drive current below +40°C. Other
features shared by both devices include soft-start, output
overvoltage protection, output overcurrent/short-circuit
protection, output True Shutdown™, and thermal
shutdown.
The MAX8608Y/MAX8608Z are available in a space-saving,
14-pin, 3mm x 3mm TDFN lead-free package.
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