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LP8555

更新时间： 2024-11-10 11:12:35
品牌 Logo 应用领域
德州仪器 - TI 驱动电脑驱动器
页数 文件大小 规格书
63页 1321K
描述
适用于平板电脑的高效 LED 背光驱动器

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LP8555 数据手册

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LP8555  
SNVS857 –FEBRUARY 2014  
LP8555 High-Efficiency LED Backlight Driver for Tablet PCs  
1 Features  
3 Description  
The LP8555 is a high efficiency LED driver with  
integrated dual DC-DC boost converters. It has 12  
high-precision current sinks that can be controlled by  
a PWM input signal, an I2C master, or both.  
1
•
•
•
Dual High-Efficiency DC/DC Boost Converters  
2.7-V to 20-V VDD Range  
12 50-mA High-Precision LED Current Sinks With  
12-Bit Brightness Control  
Dual-boost configuration of LP8555 shares the load  
to two inductors and allows thinner overall solution  
size and better efficiency compared to single-boost  
solutions. 12 LED strings allows driving high number  
of LEDs with optimal efficiency since boost  
conversion ratio can be kept low.  
•
Adaptive LED Current Sink Headroom Controls for  
Maximum System Efficiency  
•
•
LED String Count Auto-Detection  
Phase-Shifted PWM Mode for Reduced Audible  
Noise  
The boost converter has adaptive output voltage  
control based on the LED current sink headroom  
voltages. This feature minimizes the power  
consumption by adjusting the voltage to lowest  
sufficient level in all conditions.  
•
•
PWM Input Duty-Cycle and/or I2C-Register  
Brightness Control  
Hybrid PWM and Current Dimming for Higher LED  
Drive Optical Efficiency  
•
•
Flexible CABC Support  
EPROM, I2C-Register, or External Resistors for  
Configuration  
The LED string auto-detect function enables use of  
the same device in systems with 2 to 12 LED strings  
for the maximum design flexibility. Proprietary Hybrid  
PWM and Current dimming mode 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.  
•
Improved Boost EMI Performance with Slew-Rate  
Control, Spread Spectrum, and Phase-Shifted  
Switching  
•
Extensive Fault Detection Schemes  
2 Applications  
Device Information  
•
Tablet LCD Display LED Backlight  
ORDER NUMBER PACKAGE  
BODY SIZE  
LP8555YFQR  
DSBGA (36)  
2,478mm x 2,478mm  
4 Simplified Schematic  
7 - 28V  
1.3 ”ꢀ9OUT / VIN ”ꢀ10  
L1  
D1  
VBATT  
LED Drive Efficiency  
2.7V ± 20V  
CVDD  
VOUT_A  
CIN_A  
COUT_A  
92  
Inductor: IHLP2525CZER6R8M01  
SW_A  
FB_A  
VDD  
VLDO  
CVLDO  
LCD Display  
90  
88  
86  
84  
82  
80  
LEDA1  
LEDA2  
LEDA3  
LEDA4  
LP8555  
EN/VDDIO  
FSET/SDA  
EN  
LEDA5  
LEDA6  
RPULL-UP  
SDA  
VIN = 3.0 V  
VIN = 3.7 V  
VIN = 4.2 V  
VIN = 5.4 V  
VIN = 7.4 V  
VIN = 8.4 V  
ISET/SCL  
PWM/INT  
SCL  
INT  
LEDB1  
LEDB2  
LEDB3  
VDDIO  
RPULL-UP  
LEDB4  
LEDB5  
0
20  
40  
60  
80  
100  
LEDB6  
Brightness (%)  
C002  
FB_B  
GNDs  
CIN_B  
SW_B  
VOUT_B  
VBATT  
2.7V ± 20V  
COUT_B  
7 - 28V  
1.3 ”ꢀ9OUT / VIN ”ꢀ10  
L2  
D2  
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,  
intellectual property matters and other important disclaimers. PRODUCTION DATA.  
 
 
 
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LP8555 替代型号

型号 品牌 替代类型 描述 数据表
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