MAX753 Maxim, MAX753 Datasheet
MAX753
Manufacturer Part Number
MAX753
Description
CCFL Backlight and LCD Contrast Controllers
Manufacturer
Maxim
Datasheet
1.MAX753.pdf
(16 pages)
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The MAX753/MAX754 drive cold-cathode fluorescent
lamps (CCFLs) and provide the LCD backplane bias
(contrast) power for color or monochrome LCD panels.
These ICs are designed specifically for backlit note-
book-computer applications.
Both the backplane bias and the CCFL supply can be
shut down independently. When both sections are shut
down, supply current drops to 25µA. The LCD contrast
and CCFL brightness can be adjusted by clocking sep-
arate digital inputs or using external potentiometers.
LCD contrast and backlight brightness settings are pre-
served in their respective counters while in shutdown.
On power-up, the LCD contrast counter and CCFL
brightness counter are set to one-half scale.
The ICs are powered from a regulated 5V supply. The
magnetics are connected directly to the battery, for
maximum power efficiency.
The CCFL driver uses a Royer-type resonant architec-
ture. It can provide from 100mW to 6W of power to one
or two tubes. The MAX753 provides a negative LCD
bias voltage; the MAX754 provides a positive LCD bias
voltage.
________________________Applications
19-0197; Rev 1; 1/95
Call toll free 1-800-998-8800 for free samples or literature.
_______________General Description
Notebook Computers
Palmtop Computers
Pen-Based Data Systems
Personal Digital Assistants
Portable Data-Collection Terminals
________________________________________________________________ Maxim Integrated Products
LCD Contrast Controllers
____________________________Features
* Contact factory for dice specifications.
__________________Pin Configuration
______________Ordering Information
MAX753CPE
MAX753CSE
MAX753C/D
MAX753EPE
MAX753ESE
MAX754CPE
MAX754CSE
MAX754C/D
MAX754EPE
MAX754ESE
Block Diagram located at end of data sheet.
Drives Backplane and Backlight
4V to 30V Battery Voltage Range
Low 500µA Supply Current
Digital or Potentiometer Control of CCFL
Brightness and LCD Bias Voltage
Negative LCD Contrast (MAX753)
Positive LCD Contrast (MAX754)
Independent Shutdown of Backlight and
Backplane Sections
25µA Shutdown Supply Current
PART
TOP VIEW
CCFL Backlight and
CADJ
LADJ
CON
GND
LON
CFB
V
REF
DD
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
TEMP. RANGE
1
2
3
4
5
6
7
8
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
MAX753
MAX754
DIP/SO
16
15
14
13
12
11
10
9
16 Plastic DIP
16 Narrow SO
Dice*
16 Plastic DIP
16 Narrow SO
16 Plastic DIP
16 Narrow SO
Dice*
16 Plastic DIP
16 Narrow SO
PIN-PACKAGE
LFB
BATT
LX
CDRV
CS
CC
LDRV
PGND
1
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