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MAX8709B

Description
0.5 A FLUORESCENT LIGHT CONTROLLER, QCC28
CategoryPower/power management   
File Size994KB,24 Pages
ManufacturerMaxim
Websitehttps://www.maximintegrated.com/en.html
Download Datasheet View All

MAX8709B Overview

0.5 A FLUORESCENT LIGHT CONTROLLER, QCC28

19-0768; Rev 0; 3/07
High-Efficiency CCFL Backlight
Controller with SMBus Interface
General Description
The MAX8709B integrated backlight controller is
optimized to drive cold-cathode fluorescent lamps
(CCFLs) using a resonant full-bridge inverter architecture.
The resonant operation maximizes striking capability and
provides near-sinusoidal waveforms over the entire input
range to improve CCFL lifetime. The controller operates
over a wide input voltage range of 4.6V to 28V with high
power-to-light efficiency. The device also includes safety
features that effectively protect against many single-point
fault conditions including lamp-out and short-circuit faults.
The MAX8709B achieves 10:1 dimming range by “chop-
ping” the lamp current on and off using a digital pulse-
width-modulation (DPWM) method. The minimum DPWM
duty cycle of the MAX8709B is 12.5%. The brightness is
controlled with a 2-wire SMBus™-compatible interface.
The device directly drives the four external N-channel
power MOSFETs of the full-bridge inverter. An internal
5.3V linear regulator powers the MOSFET drivers, the
DPWM oscillator, and most of the internal circuitry. The
MAX8709B is available in a space-saving 28-pin
thin QFN package and operates over a -40°C to +85°C
temperature range.
Features
Synchronized to Resonant Frequency
Longer Lamp Life
Guaranteed Striking Capability
High Power-to-Light Efficiency
Wide Input Voltage Range (4.6V to 28V)
Feed Forward for Excellent Line Rejection
SMBus Dimming Control Interface
10:1 Dimming Range
Guaranteed 200Hz to 220Hz DPWM Frequency
Secondary Voltage Limit Reduces Transformer
Stress
Adjustable Lamp-Out Protection with 1s Timer
Secondary Current Limit Protects Against High-
Voltage Short Circuits to Ground
Small, 5mm x 5mm, Thin QFN Package
MAX8709B
Ordering Information
PART
MAX8709BETI
TEMP RANGE
-40°C to +85°C
PIN-PACKAGE
28 Thin QFN 5mm x 5mm
Applications
Notebook Computer Displays
LCD Monitors
SMBus is a trademark of Intel Corp.
LCD TVs
Automotive Displays
Pin Configuration appears at end of data sheet.
Minimal Operating Circuit
V
IN
BATT
V
CC
V
DD
BST2
LOT
REF
BST1
GH1
GND
MAX8709B
LX1
ILIM
LX2
GL1
CCV
CCI
PGND
GL2
SUS
SDA
SCL
GH2
VFB
ISEC
IFB
________________________________________________________________
Maxim Integrated Products
1
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.
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