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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX7534 Datasheet

CCFL Backlight and LCD Contrast Controllers

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19-0197; Rev 1; 1/95
CCFL Backlight and
LCD Contrast Controllers
_______________General Description
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
Notebook Computers
Palmtop Computers
Pen-Based Data Systems
Personal Digital Assistants
Portable Data-Collection Terminals
____________________________Features
o Drives Backplane and Backlight
o 4V to 30V Battery Voltage Range
o Low 500µA Supply Current
o Digital or Potentiometer Control of CCFL
Brightness and LCD Bias Voltage
o Negative LCD Contrast (MAX753)
o Positive LCD Contrast (MAX754)
o Independent Shutdown of Backlight and
Backplane Sections
o 25µA Shutdown Supply Current
______________Ordering Information
PART
TEMP. RANGE
MAX753CPE
0°C to +70°C
MAX753CSE
0°C to +70°C
MAX753C/D
0°C to +70°C
MAX753EPE
-40°C to +85°C
MAX753ESE
-40°C to +85°C
MAX754CPE
0°C to +70°C
MAX754CSE
0°C to +70°C
MAX754C/D
0°C to +70°C
MAX754EPE
-40°C to +85°C
MAX754ESE
-40°C to +85°C
* Contact factory for dice specifications.
PIN-PACKAGE
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 Configuration
TOP VIEW
VDD 1
LADJ 2
LON 3
CON 4
CADJ 5
GND 6
REF 7
CFB 8
MAX753
MAX754
16 LFB
15 BATT
14 LX
13 LDRV
12 PGND
11 CDRV
10 CS
9 CC
DIP/SO
Block Diagram located at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
Call toll free 1-800-998-8800 for free samples or literature.
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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX7534 Datasheet

CCFL Backlight and LCD Contrast Controllers

No Preview Available !

CCFL Backlight and
LCD Contrast Controllers
ABSOLUTE MAXIMUM RATINGS
VDD to GND .................................................................-0.3V, +7V
PGND to GND.....................................................................±0.3V
BATT to GND.............................................................-0.3V, +36V
LX to GND............................................................................±50V
CS to GND.....................................................-0.6V, (VDD + 0.3V)
Inputs/Outputs to GND (LADJ, CADJ, LON,
CON, REF, CFB, CC, CDRV, LDRV, LFB) .....-0.3V, (VDD + 0.3V)
Continuous Power Dissipation (TA = +70°C)
Plastic DIP (derate 10.53mW/°C above +70°C) ...........842mW
Narrow SO (derate 8.70mW/°C above +70°C) .............696mW
Operating Temperature Ranges
MAX75_C_ _ ........................................................0°C to +70°C
MAX75_E_ _......................................................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10sec) .............................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VDD = 5V, BATT = 15V, CON = LON = 5V, LX = GND = PGND = 0V, IREF = 0mA, all digital input levels are 0V or 5V,
TA = TMIN to TMAX, unless otherwise noted.)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
SUPPLY AND REFERENCE
BATT Input Range
4 30 V
VDD Supply Range
REF Output Voltage
No external load
4.5
1.21
1.25
5.5
1.29
V
V
REF Line Regulation
REF Load Regulation
VDD Quiescent Current
VDD Shutdown Current
4V < VDD < 6V
0µA < IL < 100µA
LON = CON = CS = LFB = CFB =
LADJ = CADJ = 5V
LON = CON = CS = LFB = CFB = LADJ
= CADJ = LX = BATT = 0V (Note 1)
0.1 %/V
5 15 mV
0.5 2
mA
25 40
µA
DIGITAL INPUTS AND DRIVER OUTPUTS
Input Low Voltage
Input High Voltage
Input Leakage Current
Driver Sink/Source Current
LON, CON, CADJ, LADJ; VDD = 4.5V
0.8
LON, CON, CADJ, LADJ; VDD = 5.5V
2.4
LON, CON, CADJ, LADJ; VIN = 0V or 5V
±1
LDRV = CDRV = 2V
0.5
V
V
µA
A
Driver On-Resistance
LDRV, CDRV;
VDD = 4.5V
Output high
Output low
10
7
CCFT CONTROLLER
Zero-Crossing-Comparator Threshold Voltage (CS)
-10 20 mV
Overcurrent-Comparator Threshold Voltage (CS)
1.2 1.3 V
CS Input Bias Current
VCO Frequency
VCS = 0V
Minimum, CFB = 5V
Maximum, CFB = 0V
-5 µA
32 47
kHz
85 115
DAC Resolution
Guaranteed monotonic
5
Bits
2 _______________________________________________________________________________________
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Part Number MAX7534
Description CCFL Backlight and LCD Contrast Controllers
Maker Maxim
Total Page 16 Pages
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