Maxim has introduced the MAX8901A/MAX8901B small, high efficiency white-LED (WLED) drivers ideal for the 1,5-inch to 4-inch LCDs used in battery-operated devices such as smartphones, PDAs, portable media players, GPS devices and digital still cameras.
These devices achieve up to 92% efficiency while driving a string of two to six WLEDs and measure only 2 mm x 2 mm. They operate from a fixed 750 kHz switching frequency, which enables the use of 1 μF input and 0,1 μF output capacitors.
The MAX8901A/MAX8901B provide a single input to enable the IC and to control LED intensity. With the LED current proportional to the PWM duty cycle, the MAX8901A uses a direct-PWM input to regulate LED intensity. In contrast, the MAX8901B uses single-wire, serial-pulse dimming that reduces LED intensity in 32 linear steps. Full-scale LED current for serial-pulse dimming is 24,75 mA, and each step is 0,75 mA. In addition to providing flexible dimming control, both drivers integrate robust protection features: internal soft-start to eliminate inrush currents during startup, input over-voltage protection, LED over-voltage protection, under-voltage lockout, and thermal shutdown. To conserve battery power, these WLED drivers consume only 0,1 μA in shutdown mode.
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