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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1839 Datasheet

Wide Brightness Range CCFL Backlight Controllers

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MAX1839 pdf
19-1755; Rev 1; 3/01
Wide Brightness Range
CCFL Backlight Controllers
General Description
The MAX1739/MAX1839 fully integrated controllers are
optimized to drive cold-cathode fluorescent lamps
(CCFLs) using the industry-proven Royer oscillator
inverter architecture. The Royer architecture provides
near sinusoidal drive waveforms over the entire input
range to maximize the life of CCFLs. The MAX1739/
MAX1839 optimize this architecture to work over a wide
input voltage range, achieve high efficiency, and maxi-
mize the dimming range.
The MAX1739/MAX1839 monitor and limit the trans-
former center-tap voltage when required. This ensures
minimal voltage stress on the transformer, which
increases the operating life of the transformer and
eases its design requirements. These controllers also
provide protection against many other fault conditions,
including lamp-out and buck short faults.
These controllers achieve 50:1 dimming range by
simultaneously adjusting lamp current and “chopping”
the CCFL on and off using a digitally adjusted pulse-
width modulated (DPWM) method. CCFL brightness is
controlled by an analog voltage or is set with an
SMBusTM-compatible two-wire interface (MAX1739).
The MAX1739/MAX1839 drive an external high-side
N-channel power MOSFET and two low-side N-channel
power MOSFETs, all synchronized to the Royer oscilla-
tor. An internal 5.3V linear regulator powers the MOS-
FET drivers and most of the internal circuitry. The
MAX1739/MAX1839 are available in space-saving
20-pin QSOP packages and operate over the -40°C to
+85°C temperature range.
________________________Applications
Notebook/Laptop Computers
Car Navigation Displays
LCD Monitors
Point-of-Sale Terminals
Portable Display Electronics
Patent pending
SMBus is a trademark of Intel Corp.
Features
o Fast Response to Input Change
o Wide Input Voltage Range (4.6V to 28V)
o High Power-to-Light Efficiency
o Minimizes Transformer Voltage Stress
o Lamp-Out Protection with 2s Timeout
o Buck Switch Short and Other Single-Point Fault
Protection
o Integrated Royer MOSFET Drivers Reduce
Transformer Pin Count
o Buck Operation Synchronized to Royer Oscillator
o Synchronizable DPWM Frequency
o Pin-Selectable Brightness Control Interface
o SMBus Serial Interface (MAX1739)
o Analog Interface (MAX1739/MAX1839)
PART
MAX1739EEP
MAX1839EEP
Ordering Information
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
20 QSOP
20 QSOP
Pin Configuration
TOP VIEW
REF 1
MINDAC 2
CCI 3
CCV 4
SH/SUS 5
CRF/SDA 6
CTL/SCL 7
MODE 8
CSAV 9
CTFB 10
MAX1739
20 BATT
19 DH
18 LX
17 BST
16 VL
15 GND
14 CS
13 DL1
12 DL2
11 SYNC
QSOP
Pin Configurations continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1839 Datasheet

Wide Brightness Range CCFL Backlight Controllers

No Preview Available !

MAX1839 pdf
Wide Brightness Range
CCFL Backlight Controllers
ABSOLUTE MAXIMUM RATINGS
VBATT to GND ...........................................................-0.3V to 30V
VBST, VSYNC to GND.................................................-0.3V to 34V
VBST to VLX .................................................................-0.3V to 6V
VDH to VLX .................................................-0.3V to (VBST + 0.3V)
VLX to GND...................................................-6V to (VBST + 0.3V)
VL to GND...................................................................-0.3V to 6V
VCCV, VCCI, VREF, VDL1, VDL2 to GND .........-0.3V to (VL + 0.3V)
VMINDAC, VCTFB, VCSAV to GND ................................-0.3V to 6V
VCS to GND...................................................-0.6V to (VL + 0.3V)
VMODE to GND.............................................................-6V to 12V
VCRF/SDA, VCRF, VCTL/SCL, VCTL, VSH/SUS,
V SH to GND ............................................................-0.3V to 6V
Continuous Power Dissipation (TA = +70°C)
20-Pin QSOP (derate 9.1mW/°C above +70°C)...........727mW
Operating Temperature .......................................-40°C to +85°C
Storage Temperature.........................................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+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
(V+ = 8.2V, VSH/SUS = VSH = 5.5V, MINDAC = GND, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
SUPPLY AND REFERENCE
VBATT Input Voltage Range
VBATT Quiescent Current, Operation
with Full Duty Cycle on DH
VBATT Quiescent Current, Shutdown
VL Output Voltage, Normal Operation
VL Output Voltage, Shutdown
VL Undervoltage Lockout Threshold
VL Undervoltage Lockout Hysteresis
REF Output Voltage, Normal
Operation
VL POR Threshold
SWITCHING REGULATOR
DH Driver On-Resistance
DL1, DL2 Driver On-Resistance
Minimum DH Switching Frequency
DH Minimum Off-Time
DH Maximum Duty Cycle
SYNC Synchronization Range
SYNC Input Current
SYNC Input Threshold
SYNC Input Hysteresis
SYNC Threshold Crossing to DL1,
DL2 Toggle Delay
CS Overcurrent Threshold
CONDITIONS
VL = VBATT
VL = open
DH = DL1 = DL2 = open
SH/SUS = SH = GND
VBATT = 28V
VBATT = VL = 5V
6V < VBATT < 28V, 0 < ILOAD < 15mA
SH/SUS = SH = GND, no load
VL rising (leaving lockout)
VL falling (entering lockout)
4.5V < VL < 5.5V, IREF = 40µA
1/tDH, SYNC = CS or GND, not synchronized
Detect falling edges on SYNC
0 < VSYNC < 30V
SYNC falling, referred to CS
Referred to the SYNC input threshold
VSYNC = 0 to 5V, CDL_1 and CDL_2 < 100pF,
50% point on SYNC to 50% point on DL1 or DL2
MIN TYP MAX UNITS
4.6 5.5
6 28
3.2 6
3.2 6
6 20
5.0 5.35 5.5
3.5 4.5 5.5
4.6
4.0
300
1.96 2.00 2.04
0.9 2.7
V
mA
µA
V
V
V
mV
V
V
18
18
49 56 64 kHz
250 375 500
ns
98 %
64 200 kHz
-2 2 µA
400 500 600 mV
50 100 150 mV
120 ns
408 450 492 mV
2 _______________________________________________________________________________________


Part Number MAX1839
Description Wide Brightness Range CCFL Backlight Controllers
Maker Maxim
Total Page 26 Pages
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