MAX8722 Maxim Integrated Products, MAX8722 Datasheet
MAX8722
Manufacturer Part Number
MAX8722
Description
Low-Cost CCFL Backlight Controller
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX8722.pdf
(20 pages)
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The MAX8722 integrated backlight controller is opti-
mized to drive cold-cathode fluorescent lamps (CCFLs)
using a full-bridge resonant inverter architecture.
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 (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 MAX8722 achieves 10:1 dimming range by “chop-
ping” the lamp current on and off using a digital pulse-
width modulation (DPWM) method. The DPWM frequency
can be accurately adjusted with a resistor or synchro-
nized to an external signal. The brightness is controlled
by an analog voltage on the CNTL pin. The device direct-
ly 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 MAX8722 is available in
a low-cost, 24-pin QSOP package and operates over a
-40°C to +85°C temperature range.
19-3321; Rev 0; 6/04
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.
TOP VIEW
Notebook Computer Displays
LCD Monitors
LCD TVs
DPWM
COMP
SHDN
SYNC
CNTL
BATT
FREQ
TFLT
ISEC
ILIM
VFB
IFB
________________________________________________________________ Maxim Integrated Products
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General Description
MAX8722
QSOP
Pin Configuration
Low-Cost CCFL Backlight Controller
24
23
22
21
20
19
18
17
16
15
14
13
Applications
GND
V
V
PGND
GL2
GL1
GH1
LX1
BST1
BST2
LX2
GH2
CC
DD
MAX8722EEG
VIN
V
CC
Synchronized to Resonant Frequency
Wide Input Voltage Range (4.6V to 28V)
Input-Voltage Feed-Forward for Excellent Line
Rejection
Accurate Dimming Control with Analog Interface
10:1 Dimming Range
Adjustable Accurate DPWM Frequency with Sync
Function
Adjustable Lamp Current Rise and Fall Time
Secondary Voltage Limit Reduces Transformer
Stress
Lamp-Out Protection with Adjustable Timeout
Secondary Overcurrent Protection with
Adjustable Timeout
Low-Cost 24-Pin QSOP Package
Longer Lamp Life
Guaranteed Striking Capability
High Power to Light Efficiency
PART
BATT
GND
V
ILIM
FREQ
SHDN
CNTL
SYNC
DPWM
COMP
TFLT
Minimal Operating Circuit
CC
MAX8722
-40 C to +85 C
TEMP RANGE
PGND
BST2
BST1
ISEC
GH1
GL1
GL2
GH2
VFB
Ordering Information
V
LX1
LX2
IFB
DD
V
CC
PIN-PACKAGE
24 QSOP
Features
1
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