MAX8759

BATT to GND..........................................................-0.3V to +30V
BST1, BST2 to GND ...............................................-0.3V to +36V
BST1 to LX1, BST2 to LX2 ....................................-0.3V to +6V
FREQ, V_CC, V_DD to GND .......................................-0.3V to +6V
SDA, SCL to GND..................................................-0.3V to +6V
ALS, COMP, PWMI, PWMO,
    TFLT, DEL, VALS to GND.......................-0.3V to (V_CC + 0.3V)
GH1 to LX1 ...........................................-0.3V to (V_BST1 + 0.3V)
GH2 to LX2 ...........................................-0.3V to (V_BST2 + 0.3V)
GL1, GL2 to GND.......................................-0.3V to (V_DD + 0.3V)
IFB1, IFB2, ISEC, VFB to GND ....................................-3V to +6V
PGND1, PGND2 to GND .......................................-0.3V to +0.3V
Continuous Power Dissipation (T_A = +70°C)
   28-Pin Thin QFN 5mm x 5mm
   (derate 21.3mW/°C above +70°C).........................1702mW
Operating Temperature Range ......................-40°C to +85°C
Junction Temperature...................................................+150°C
Storage Temperature Range .......................-65°C to +150°C
Lead Temperature (soldering, 10s) .............................+300°C

Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

The MAX8759 integrated cold-cathode fluorescent lamp (CCFL) inverter controller is designed to drive CCFLs using a full-bridge resonant inverter. The resonant operation ensures reliable striking and provides near-sinusoidal waveforms over the entire input range. The controller MAX8759 operates over a wide input-voltage range of 4.5V to 28V with high power to light efficiency. The MAX8759 also includes safety features that effectively protect against single-point fault conditions such as lamp-out, secondary overvoltage, and secondary short-circuit faults.

The MAX8759 provides accurate lamp-current regulation (±2.5%) for superior CCFL inverter performance.The lamp current is adjustable with an external resistor;10:1 dimming range can be achieved by turning the CCFL on and off using a digital pulse-width modulation (DPWM) method, while maintaining the lamp-current constant. The MAX8759 provides three mechanisms for controlling brightness: 2-wire SMBus™-compatible interface, external ambient-light sensor (ALS), or system PWM control. The MAX8759 supports Intel display power-saving technology (DPST) to maximize battery life. The device includes two lamp-current feedback input pins that support dual-lamp applications with a minimum number of external components.

The MAX8759 controls a full-bridge inverter for maximum efficiency and directly drives four external n-channel power MOSFETs. An internal 5.35V linear regulator powers the MOSFET drivers and most of the internal circuitry. The MAX8759 is available in a space-saving,28-pin, thin QFN package and operates over a -40°C to +85°C temperature range.