LP8543SQE/NOPB National Semiconductor, LP8543SQE/NOPB Datasheet
LP8543SQE/NOPB
Manufacturer Part Number
LP8543SQE/NOPB
Description
IC LED DVR LCD BACKLIGHT 24-LLP
Manufacturer
National Semiconductor
Type
Backlight, White LED (I²C Interface)r
Datasheet
1.LP8543SQNOPB.pdf
(2 pages)
Specifications of LP8543SQE/NOPB
Constant Current
*
Constant Voltage
*
Topology
*
Number Of Outputs
*
Internal Driver
*
Type - Primary
*
Type - Secondary
*
Frequency
*
Voltage - Supply
*
Voltage - Output
*
Mounting Type
Surface Mount
Package / Case
24-LLP
Operating Temperature
*
Current - Output / Channel
*
Internal Switch(s)
Yes
Led Driver Application
General Lighting
No. Of Outputs
7
Output Current
60mA
Input Voltage
5.5V To 22V
Dimming Control Type
PWM
Driver Case Style
LLP
Rohs Compliant
Yes
No. Of Pins
24
Leaded Process Compatible
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Efficiency
-
© 2009 National Semiconductor Corporation
SMBus/I2C Controlled WLED Driver for Medium Sized LCD
Backlight
General Description
The LP8543 is a white LED driver with integrated boost con-
verter. It has 7 adjustable current sinks which can be con-
trolled by SMBus or I
input and Ambient Light Sensor (ALS).
The boost converter has adaptive output voltage control
based on the LED driver voltages. This feature minimizes the
power consumption by adjusting the voltage to lowest suffi-
cient level in all conditions. Phase Shift PWM dimming offers
further power saving especially when there is poor matching
in the forward voltages of the LED strings. Boost voltage can
also be controlled through the SMBus/I
Internal EEPROM stores the data for backlight brightness and
ambient light sensor calibration. Brightness can be calibrated
during the backlight unit production so that all units produce
the same brightness. EEPROM also stores the coefficients
for the LED control equations and the default LED current
value. LED current has 8–bit adjustment from 0 to 60 mA.
The LP8543 has several safety and diagnostic features. Low-
input voltage detection turns the chip off if the system gets
stuck and battery fully discharges. Input voltage detection
threshold is adjustable for different battery configurations.
Thermal regulation reduces backlight brightness above a set
temperature. LED fault detection reports open or LED short
fault. Boost over-current fault detection protects the chip in
case of over-current event.
LP8543 is available in National's LLP-24 package.
NOTICE: This document is not a full datasheet. For more
information regarding this product or to order samples,
please contact your local National Semiconductor sales
office or visit http://www.national.com/support/dir.html.
Typical Application
2
C-compatible serial interface, PWM
2
LP8543 PRODUCT BRIEF
C.
300858
Features
■
■
■
■
■
■
■
■
■
■
■
■
■
Applications
■
■
High-voltage DC/DC boost converter with integrated FET
5.5 - 22V input voltage range to support 2x, 3x and 4x Li-
Ion batteries.
PWM phase shift control with adaptive boost output to
increase efficiency compared to conventional boost
converters topologies
PWM brightness control for single wire control and stand-
alone use
Digital Ambient light sensor interface with user-
programmed ambient light to backlight brightness curve
Easy-to-use EEPROM calibration for current, intensity and
ambient light response setting
Seven LED drivers with LED fault (short/open) detection
Eight-bit LED current control
Internal thermal protection and backlight safety dimming
feature
Two wire, SMBus/ I
Low-input voltage detection and shutdown
Minimum number of external components
LLP-24 package, 4 x 4 x 0.8 mm (0.4 mm pitch)
Medium sized (>10 inches) LCD Display Backlight
LED Lighting
2
C-compatible control interface
30085870
August 18, 2009
www.national.com
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LP8543SQE/NOPB Summary of contents
Page 1
... LP8543 is available in National's LLP-24 package. NOTICE: This document is not a full datasheet. For more information regarding this product or to order samples, please contact your local National Semiconductor sales office or visit http://www.national.com/support/dir.html. Typical Application © 2009 National Semiconductor Corporation ...
Page 2
... For more National Semiconductor product information and proven design tools, visit the following Web sites at: Products Amplifiers www.national.com/amplifiers Audio www.national.com/audio Clock and Timing www.national.com/timing Data Converters www.national.com/adc Interface www.national.com/interface LVDS www.national.com/lvds Power Management www.national.com/power Switching Regulators www.national.com/switchers LDOs www.national.com/ldo LED Lighting www ...