MAX8759 Maxim Integrated Products, MAX8759 Datasheet

MAX8759

Manufacturer Part Number

MAX8759

Description

CCFL Backlight Controller

Manufacturer

Maxim Integrated Products

Datasheet

1.MAX8759.pdf (31 pages)

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The MAX8759 integrated cold-cathode fluorescent lamp

(CCFL) inverter controller is designed to drive CCFLs

using a full-bridge resonant inverter. The resonant opera-

tion ensures reliable striking and provides near-sinusoidal

waveforms over the entire input range. The controller

operates over a wide input-voltage range of 4.5V to 28V

with high power to light efficiency. The device 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 regula-

tion (±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 sys-

tem 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 maxi-

mum efficiency and directly drives four external n-chan-

nel 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.

19-3874; Rev 1; 2/06

+ Denotes lead-free package.

*EP = Exposed pad.

Pin Configuration appears at end of data sheet.

SMBus is a trademark of Intel Corp.

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

MAX8759ETI+

PART

Notebooks

LCD Monitors

Automotive Infotainment

Low-Cost, SMBus, CCFL Backlight Controller

-40°C to +85°C

TEMP RANGE

________________________________________________________________ Maxim Integrated Products

Ordering Information

General Description

PIN-

PACKAGE

28 Thin QFN-EP*

5mm × 5mm

Applications

T2855-6

CODE

PKG

♦ Accurate Dimming Control Using SMBus, PWM

♦ 10:1 Dimming Range with 256-Step Resolution

♦ Resonant-Mode Operation

♦ 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

♦ Small 28-Pin, 5mm x 5mm, Thin QFN Package

Interface, or Ambient Light Sensor

Longer Lamp Life with Near Sinusoidal Lamp-

Current Waveform

Guaranteed Striking Capability

High-Power-to-Light Efficiency

Secondary Voltage Limiting

Primary Current Limit with Lossless Sensing

Lamp-Out Protection with Adjustable Timeout

Secondary Short-Circuit Protection

Minimal Operating Circuit

MAX8759

Features

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