LP8551TLE/NOPB National Semiconductor, LP8551TLE/NOPB Datasheet
LP8551TLE/NOPB
Manufacturer Part Number
LP8551TLE/NOPB
Description
IC LED BACKLIGHT DRIVER SMD-25
Manufacturer
National Semiconductor
Series
PowerWise®r
Datasheet
1.LP8551TLXNOPB.pdf
(4 pages)
Specifications of LP8551TLE/NOPB
Internal Driver
Yes
Type - Primary
Backlight
Type - Secondary
White LED
Mounting Type
Surface Mount
Topology
PWM, Step-Up (Boost)
Number Of Outputs
4
Frequency
Adjustable/Selectable
Voltage - Supply
2.7 V ~ 22 V
Package / Case
25-UFBGA
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Voltage - Output
-
Operating Temperature
-
© 2010 National Semiconductor Corporation
High-Efficiency LED Backlight Driver for Notebooks
General Description
The LP8551 is a white LED driver with integrated boost con-
verter. It has four adjustable current sinks which can be
controlled by PWM input or with I
face.
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.
LED outputs have 8-bit current resolution and up to 13-bit
PWM resolution to achieve smooth and precise brightness
control. Proprietary Phase Shift PWM control is used for LED
outputs to reduce peak current from the boost converter, thus
making the boost capacitors smaller. The Phase Shifting
scheme also eliminates audible noise.
Internal EEPROM is used for storing the configuration data.
This makes it possible to have minimum external component
count and make the solution very small.
LP8551 has safety features which make it possible to detect
LED outputs with open or short fault. As well low input voltage
and boost over-current conditions are monitored and chip is
turned off in case of these events. Thermal de-rating function
prevents overheating of the device by reducing backlight
brightness when set temperature has been reached.
LP8551 is available in National's micro SMD-25 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 (1)
2
C-compatible serial inter-
LP8551 PRODUCT BRIEF
301212
Features
■
■
■
■
■
■
■
■
■
Applications
■
■
High-voltage DC/DC boost converter with integrated FET
with four switching frequency options: 156/312/625/1250
kHz
2.7V – 22V input voltage range to support 1x…5x cell Li-
Ion batteries
Programmable PWM resolution 8 to 13 bits
I
PWM output frequency and LED current set through
resistors
4 LED outputs with LED fault (short/open) detection
Low input voltage, over-temperature, over-current
detection and shutdown
Minimum number of external components
Micro SMD-25 package, 2.466 x 2.466 x 0.6 mm
Notebook and Netbook LCD Display LED Backlight
LED Lighting
2
C and PWM brightness control
August 31, 2010
www.national.com
30121270
Related parts for LP8551TLE/NOPB
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
Part Number:
Description:
National Semiconductor [8-Bit D/A Converter]
Manufacturer:
National Semiconductor
Datasheet:
Part Number:
Description:
National Semiconductor [Media Coprocessor]
Manufacturer:
National Semiconductor
Datasheet:
Part Number:
Description:
Digitally Controlled Tone and Volume Circuit with Stereo Audio Power Amplifier, Microphone Preamp Stage and National 3D Sound
Manufacturer:
National Semiconductor
Datasheet:
Part Number:
Description:
Digitally Controlled Tone and Volume Circuit with Stereo Audio Power Amplifier, Microphone Preamp Stage and National 3D Sound
Manufacturer:
National Semiconductor
Datasheet:
Part Number:
Description:
AC97 Rev 2 Codec with Sample Rate Conversion and National 3D Sound
Manufacturer:
National Semiconductor
Part Number:
Description:
Manufacturer:
National Semiconductor
Datasheet:
Part Number:
Description:
Manufacturer:
National Semiconductor
Datasheet:
Part Number:
Description:
General Purpose, Low Voltage, Low Power, Rail-to-Rail Output Operational Amplifiers
Manufacturer:
National Semiconductor
Datasheet:
Part Number:
Description:
8-bit 20 MSPS flash A/D converter.
Manufacturer:
National Semiconductor
Datasheet:
Part Number:
Description:
Low Noise Quad Operational Amplifier
Manufacturer:
National Semiconductor
Datasheet:
Part Number:
Description:
Quad Differential Line Receivers
Manufacturer:
National Semiconductor
Datasheet:
Part Number:
Description:
Quad High Speed Trapezoidal? Bus Transceiver
Manufacturer:
National Semiconductor
Datasheet:
Part Number:
Description:
Dual Line Receiver
Manufacturer:
National Semiconductor
Datasheet:
Part Number:
Description:
TTL to 10k ECL Level Translator with Latch
Manufacturer:
National Semiconductor
Datasheet:
LP8551TLE/NOPB Summary of contents
Page 1
... LP8551 is available in National's micro SMD-25 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 (1) © 2010 National Semiconductor Corporation ...
Page 2
Typical Application for Low Input Voltage (2) www.national.com 2 30121271 ...
Page 3
3 www.national.com ...
Page 4
... For more National Semiconductor product information and proven design tools, visit the following Web sites at: www.national.com 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 ...