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MAX1996A Datasheet

  • MAX1996A

  • " High-Efficiency, Wide Brightness Range, CCFL Backlight Con...

  • Maxim   Maxim

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19-2267; Rev 1; 10/02
High-Efficiency, Wide Brightness
Range, CCFL Backlight Controller
General Description
The MAX1996A integrated controller is optimized to
drive cold-cathode fluorescent lamps (CCFLs) using
synchronized full-bridge inverter architecture.
Synchronized drive provides near sinusoidal waveforms
over the entire input range to maximize the life of
CCFLs. The controller also operates over a wide input-
voltage range with high efficiency and broad dimming
range.
The MAX1996A includes safety features that limit the
transformer secondary voltage and protect against sin-
gle-point fault conditions including lamp-out and short-
circuit faults.
The MAX1996A regulates the CCFL brightness in three
ways: linearly controlling the lamp current, digital pulse-
width modulating (DPWM) the lamp current, or using
both methods simultaneously to achieve the widest
dimming range (>30:1). CCFL brightness can be con-
trolled with either an analog voltage or a 2-wire
SMBus鈩?compatible interface. The MAX1996A 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 synchronizable DPWM
oscillator, and most of the internal circuitry.
The MAX1996A has the same pin configuration as the
MAX1895, but with modified SMBus slave address
(0x58) and command bytes. In addition, the lamp-out
protection timer has been reduced to approximately 1s
and the DPWM frequency is guaranteed from 200Hz to
220Hz over the operating temperature range without
external components or trimming. The MAX1996A is
available in the space-saving 28-pin thin QFN package
and operates over a -40擄C to +85擄C temperature
range.
Features
o
SMBus Slave Address (0x58) for Wide Dimming
Range Inverters
o
Guaranteed 200Hz to 220Hz DPWM Frequency
o
Externally Synchronizable DPWM Frequency
o
Lamp-Out Protection with 1s Timeout
o
Synchronized to Resonant Frequency
Good Crest Factor for Longer Lamp Life
Ensures Maximum Strike Capability
o
High Power-to-Light Efficiency
o
Wide Dimming Range (3 Methods)
Lamp Current Adjust: >3 to 1
DPWM: >10 to 1
Combined: >30 to 1
o
Feed-Forward for Fast Response to Step Change
of Input Voltage
o
Wide Input-Voltage Range (4.6V to 28V)
o
Transformer Secondary Voltage Limiting to
Reduce Transformer Stress
o
Protected Against Short-Circuit and Other Single-
Point Faults
o
Dual-Mode Brightness Control Interface
o
Small Footprint 28-Pin Thin QFN (5mm
鉁?/div>
5mm)
Package
MAX1996A
Applications
BATT
CCV
Pin Configuration
N.C.
V
CC
28
27
26
25
24
23
Portable Display Electronics
ILIM
1
2
3
4
5
6
7
21
20
19
GH2
LX2
BST2
BST1
LX1
GH1
GL1
Ordering Information
PART
MAX1996AETI
MAX1996AEGI*
TEMP RANGE
-40擄C to +85擄C
-40擄C to +85擄C
PIN-PACKAGE
28 Thin QFN 5
鉁?/div>
5
28 QFN 5
鉁?/div>
5
REF
MINDAC
GND
MODE
CRF/SDA
CTL/SCL
22
Multibulb LCD Monitors
VFB
CCI
IFB
Notebook Computers
TOP VIEW
MAX1996A
18
17
16
15
*Contact
factory for availability.
10
11
12
13
PGND
SH/SUS
N.C.
N.C.
N.C.
SMBus is a trademark of Intel Corp.
THIN QFN
5mm
脳
5mm
________________________________________________________________
Maxim Integrated Products
VDD
GL2
14
8
9
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim鈥檚 website at www.maxim-ic.com.

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