MAX8930

The MAX8930 integrates a charge pump for white LED display backlighting with ambient light control (ALC) feature. The high-efficiency, adaptive-mode 1x/-0.5x charge pump drives up to 11 LEDs (8 WLEDs + RGB LED) with constant current for uniform brightness. The LED current of MAX8930 is adjustable from 0.1mA to 25.6mA in 256 linear steps through I2C. High accuracy and LED-to-LED current matching are maintained throughout the adjustment range. The MAX8930 includes soft-start, thermal shutdown, open-circuit, and short-circuit protection.

Features of the MAX8930 are:(1)white LED charge pump; (2)adaptive 1x or -0.5x negative modes; (3)11 low-dropout LED current sinks with 25.6mA to 0.1mA in 256 Dimming Steps; (4)ramp-up/down control for main white LED; (5)ramp-up/down control for RGB LED; (6)individual brightness control for each white,RGB LED; (7)low 240¦ÌA (typ) quiescent current; (8)ambient light control (ALC) for Any Type of Light Sensor; (9)Content Adaptive Interface; (10)three programmable LDOs up to 200mA; (11)step-up DC-DC converter with programmable output for PMOLED application; (12)2.7V to 5.5V supply voltage range; (13)thermal shutdown; (14)open and short-circuit protection.

The absolute maximum ratings of the MAX8930 can be summarized as:(1)PV_, VDD, PGND_, AGND to NEG:-0.3V to +6.0V;(2)storage temperature range:-65 to +150;(3)ECAGND, PGND_ to AGND:-0.3V to +0.3V;(4)junction temperature:+150;(5)LX, OUT to PGND3:-0.3V to +22V;(6)continuous power dissipation:1600mW.Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the MAX8930 at these or any other conditions above those indicated in the operational section of this specification is not implied.Exposure to absolute maximum rating conditions for extended periods may affect device reliability.The charge pump drives up to 8 white LEDs (4 WLEDs for main and 4 WLEDs for sub) and 3 RGB LEDs with regulated constant current for both display backlight and fun light applications. By utilizing individually adaptive 1x/-0.5x negative charge-pump modes and extremely low-dropout current regulators, MAX8930 is able to achieve high efficiency over the full 1-cell lithium battery input voltage range. High-frequency switching of 4MHz allows for tiny external components. The regulation scheme is optimized to ensure low EMI and low input ripple.