Maxim Integrated MAX8759ETI T

Description
The MAX8759 is a low-cost, SMBus-compatible CCFL backlight controller designed for driving CCFLs using a full-bridge resonant inverter. It operates over a wide input voltage range of 4.5V to 28V with high power to light efficiency. The device includes safety features that 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, and a 10:1 dimming range can be achieved by turning the CCFL on and off using a 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. It 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.

Features
Accurate dimming control using SMBus, PWM interface, or ambient light sensor
10:1 dimming range with 256-step resolution
Resonant-mode operation for longer lamp life with near sinusoidal lamp-current waveform
Guaranteed striking capability
High-power-to-light efficiency
Wide input-voltage range (4.5V to 28V)
Input feed-forward for excellent line rejection
±2.5% lamp-current regulation
Adjustable 1.5% accurate DPWM frequency
Dual lamp-current feedback inputs
Comprehensive fault protection:
Secondary voltage limiting
Primary current limit with lossless sensing
Lamp-out protection with adjustable timeout
Secondary short-circuit protection
Small 28-pin, 5mm x 5mm, thin QFN package
Minimal operating circuit

Applications
Notebooks
LCD monitors
Automotive infotainment