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LX1996 Datasheet

  • LX1996

  • Microsemi Corporation [Multi-string LED Back-light Controll...

  • MICROSEMI

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LX1996
TM
廬
Multi-string LED Back-light Controller
P
RODUCTION
D
ATASHEET
KEY FEATURES
鈥?/div>
White LED Backlight Controller for
Middle Size Display Panels
鈥?/div>
Up to 6 LED Strings with 鹵0.5%
Precision Current Matching
鈥?/div>
Wide Input Voltage Range from 6V
to 28V
鈥?/div>
Temperature Compensated LED
Current
鈥?/div>
Ultrasonic Pulse Skipping for
audible noise reduction
鈥?/div>
Direct Ambient Light Sensor
Interface for Brightness Control
鈥?/div>
High Efficiency over Full Dimming
Range
鈥?/div>
Low Standby Current
鈥?/div>
On-chip Thermal Shut-down
鈥?/div>
Over-voltage Protection
鈥?/div>
Packaged in a Thermally Efficient
24 pin 4x4mm MLPQ Package
APPLICATIONS
鈥?/div>
Notebook & Monitor Displays
鈥?/div>
Entertainment Systems
鈥?/div>
Automotive Lighting & Panels
DESCRIPTION
LX1996 is an integrated white LED
driver for notebook size displays. It is
designed to drive up to six strings of LEDs.
The LX1996 consists of a boost converter
and six precision current sources. It also
includes a direct analog light sensor
interface and can be dimmed by a PWM
signal or by application of a DC control
voltage.
Precision current mirror circuitry sets
all channels to the same current with a
single programming input. The current
value can be programmed up to 30mA per
channel with a single resistor from the
PRG pin to ground. Channel to channel
matching is within 鹵 0.5 percent typical at
25擄C ambient of the channels mean at the
rated output current.
Unique design features include
temperature compensated LED current,
and audible noise reduction using
Ultrasonic Pulse Skipping.
Temperature compensated LED current
is accomplished by a dedicated input pin
(OT) that in conjunction with an external
thermistor measures the LED鈥檚 ambient
temperature and thereby prevents over
temperature stress to the LEDs by keeping
them within their safe operating area.
Additional features include low sleep
mode current (6碌A(chǔ) typ.) for extending
battery time, multi-mode dimming via
ambient light sensor interface, analog
dimming, direct PWM dimming and
combination of analog and direct PWM
dimming for up to a 25000:1 dimming
range.
The LX1996 is designed to work over a
wide input voltage range from 6V to
28Vdc with adjustable over voltage
protection (OVP), and short and open LED
protection.
The LX1996 comes in a compact thermal
efficient 4x4mm 24pin MLPQ package.
WWW .
Microsemi
.C
OM
IMPORTANT:
For the most current data, consult
MICROSEMI鈥檚
website:
http://www.microsemi.com
Patents Pending
PRODUCT HIGHLIGHT
6V to 28V
N/C
VIN
EN
5V
LX1972
Light
Sensor
DSEL1
VLDO
DI
DRV
SRC
PGND
OVP
5V
OT
Large LCD Backlight
LX1996
DSEL2
CS1
CS2
CS3
CS4
CS5
CS6
PRG
Thermistor
Multi-Mode Dimming
Via Ambient Light
Sensor and/or Direct
PWM Dimming
PWM
RT
PWM
CT
CLF
GND
LED Panel
Temperature
Compensation of
LED Current
LX1996
LX1996
Current
Programing
PACKAGE ORDER INFO
THERMAL DATA
T
A
(擄C)
-40 to 85
LQ
Plastic 4x4 mm MLPQ 24-pin
RoHS Compliant / Pb-free
胃
J
A
= 30
擄C/W
THERMAL RESISTANCE
-
JUNCTION TO AMBIENT
LX1996ILQ
Note: Available in Tape & Reel. Append the letters 鈥淭R鈥?to the part number.
(i.e. LX1996ILQ-TR)
Junction Temperature Calculation: T
J
= T
A
+ (P
D
x
胃
JA
).
The
胃
JA
numbers are guidelines for the thermal performance of the
device attached to a pc-board system. All of the above assume no
ambient airflow.
Page 1
Copyright
漏
2007
Rev. 1.0, 2007-12-14
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570

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