The MAX8822 evaluation kit (EV kit) is a fully assembled and tested printed-circuit board (PCB) that demonstrates the MAX8822 ultra-efficient negative charge-pump LED driver with dual LDOs. The MAX8822 drives up to four white LEDs (WLEDs) for backlighting and contains two 200mA, low-noise, high power-supply-rejection-ratio (PSRR) LDOs to power external camera modules or other loads. The EV kit includes a MAXQ2000 microcontroller circuit that provides the serial-pulse control necessary to adjust WLED brightness and LDO output voltages. Through the MAXQ2000, WLED brightness levels are sequentially incremented/decremented between 0.1mA and 24mA and shut down by pushbutton controls. Sixteen different LDO output-voltage combinations (from off to 3.3V) are selected by DIP-switch positions and latched by a pushbutton. The MAX8822 IC includes soft-start, WLED and LDO short-circuit protection, and thermal shutdown.
Key Features
Applications/Uses
Powers Up to 4 White LEDs
Independent Adaptive Voltage Supply for Each LED
24mA to 0.1mA Dimming Range
1% (typ) Current Accuracy and 0.3% (typ) Current Matching
Dual 200mA Low-Noise, High PSRR LDOs
16 Selectable LDO Output Voltage Combinations from OFF Up to 3.3V
MAXQ2000 Microprocessor Circuit for LED and LDO Serial-Pulse Control
Sequential UP/DOWN LED Dimming Pushbutton Control
DIP-Selectable LDO Output Voltages
2.7V to 5.5V Input Range
Selectable Microprocessor Circuit Power Input (IN1, IN2)
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