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LP8557 Datasheet(PDF) 11 Page - Texas Instruments

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Part # LP8557
Description  High-Efficiency LED Backlight Driver For Tablets
PDF  49 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LP8557 Datasheet(HTML) 11 Page - Texas Instruments

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LED Current Sinks
FB
PWM Control
Headroom
Control
LED1
LED2
LED3
LED4
LED5
LED6
Boost Converter
SW
Switching
Frequency
500, 1000 kHz
Oscillator
Thermal
shutdown
Reference
Voltage
VDD
PWM
POR
Digital Logic
Fault Detection
(Open*/Short LED,
OCP, OVP)
VIN
FSET / SDA
ISET /SCL
BRIGHTNESS
CONTROL
EPROM
BOOST_FREQ
VOUT
UVLO
LP8557, LP85571
www.ti.com
SNVSA15B – DECEMBER 2013 – REVISED DECEMBER 2015
8 Detailed Description
8.1 Overview
The LP8557 and LP8557I are high-efficiency LED drivers each featuring an integrated DC-DC inductive boost
converter and six high-precision current sinks. LP8557 is intended for applications that exclusively use a pulse
width modulated (PWM) signal for controlling the brightness while LP8557I is intended for applications that can
utilize an I2C master as well.
The boost converter has adaptive output voltage control. This feature minimizes the power consumption by
adjusting the voltage to the lowest sufficient level under all conditions.
The adaptive current sink headroom voltage control scales the headroom voltage with the LED current for
optimal system efficiency.
The LED string auto-detect function enables use of the same device in systems with 1 to 6 LED strings for the
maximum design flexibility.
Proprietary hybrid PWM plus current mode dimming enables additional system power savings. Phase shift PWM
allows reduced audible noise and smaller boost output capacitors.
Flexible CABC support combines brightness level selections based on the PWM input and I2C commands.
The LP8557 and LP8557I feature a full set of features that ensure robust operation of the device and external
components. The set consists of input undervoltage lockout, thermal shutdown, overcurrent protection,
overvoltage protection, and LED open and short detection.
8.2 Functional Block Diagram
Copyright © 2013–2015, Texas Instruments Incorporated
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Product Folder Links: LP8557 LP85571



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