Datasheet LP8543SQE/NOPB - National Semiconductor

Part Number: LP8543SQE/NOPB

Detailed Description

Manufacturer: National Semiconductor

Docket:
LP8543 PRODUCT BRIEF
August 18, 2009
LP8543 PRODUCT BRIEF SMBus/I2C Controlled WLED Driver for Medium Sized LCD Backlight
General Description
The LP8543 is a white LED driver with integrated boost converter.

It has 7 adjustable current sinks which can be controlled by SMBus or I2C-compatible serial interface, PWM 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 sufficient 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/I2C. 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

Specifications:

Dimming Control Type: PWM
Input Voltage: 5.5 V to 22 V
Number of Outputs: 7
Output Current: 60 mA
Package / Case: LLP
Pb-Free: Yes
Peak Reflow Compatible (260 C): Yes
Topology: Boost (Step Up)

RoHS: Yes