Datasheet 搜索 > LED驱动器 > TI（德州仪器） > LP8556SQX-E08/NOPB 数据手册 > LP8556SQX-E08/NOPB 数据手册 1/63 页
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LP8556SQX-E08/NOPB 数据手册 - TI（德州仪器）
制造商:
TI（德州仪器）
分类:
LED驱动器
封装:
WQFN-24
描述:
高效率LED背光驱动器，用于平板电脑 High-Efficiency LED Backlight Driver for Tablets
Pictures:
3D模型
符号图
焊盘图
引脚图
产品图
页面导航:
引脚图在P4P5Hot
典型应用电路图在P47P48
原理图在P1P12P13P17P47
封装尺寸在P55P56P58P59P60
标记信息在P55P56
封装信息在P3P54P55P56P57P58P59P60
技术参数、封装参数在P6
应用领域在P1P63
电气规格在P6P7P8P9P10P15
导航目录
LP8556SQX-E08/NOPB数据手册
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若手册格式错乱，请下载阅览PDF原文件
V
IN
LP8556
MCU
VBOOST
SW
1.1 ”9
OUT
/ V
IN
”15
L1
D1
VDD
C
IN
C
OUT
LED1
LED2
LED3
LED4
LED5
LED6
GNDs
PWM
SDA
SCL
ISET
FSET
VLDO
C
VLDO
R
FSET
R
ISET
2.7V - 20V
7V ± 43V
EN / VDDIO
EN / V
DDIO
1.62V ± 3.6V
V
OUT
Optional
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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.
LP8556
SNVS871I –JULY 2012–REVISED MARCH 2016
LP8556 High-Efficiency LED Backlight Driver for Tablets
1
1 Features
1
• High-Efficiency DC–DC Boost Converter With
Integrated 0.19-Ω Power MOSFET and Three
Switching Frequency Options: 312 kHz, 625 kHz,
and 1250 kHz
• 2.7-V to 36-V Boost Switch Input Voltage Range
Supports Multi-Cell Li-Ion Batteries
(2.7-V to 20-V V
DD
Input Range)
• 7-V to 43-V Boost Switch Output Voltage Range
Supports as Few as 3 WLEDs in Series Per
Channel and as Many as 12
• Configurable Channel Count (1 to 6)
• Up to 50 mA Per Channel
• PWM and / or I
2
C Brightness Control
• Phase-Shift PWM Mode Reduces Audible Noise
• Adaptive Dimming for Higher LED Drive Optical
Efficiency
• Programmable Edge-Rate Control and Spread
Spectrum Scheme Minimize Switching Noise and
Improve EMI Performance
• LED Fault (Short and Open) Detection, UVLO,
TSD, OCP, and OVP (Up to 6 Threshold Options)
• Available in Tiny 20-Pin, 0.4-mm Pitch DSBGA
Package and 24-Pin, 0.5-mm Pitch WQFN
Package
2 Applications
LED Backlights for Tablet LCDs
Simplified Schematic
3 Description
The LP8556 device is a white-LED driver featuring an
asynchronous boost converter and six high precision
current sinks that can be controlled by a PWM signal
or an I
2
C master.
The boost converter uses adaptive output voltage
control for setting the optimal LED driver voltages as
low as 7 V and as high as 43 V. This feature
minimizes the power consumption by adjusting the
output voltage to the lowest sufficient level under all
conditions. The converter can operate at three
switching frequencies: 312 kHz, 625 kHz, and 1250
kHz, which can be set with an external resistor or
pre-configured via EPROM. Programmable slew rate
control and spread spectrum scheme minimize
switching noise and improve EMI performance.
LED current sinks can be set with the PWM dimming
resolution of up to 15 bits. Proprietary adaptive
dimming mode allows higher system power saving. In
addition, phase shifted LED PWM dimming allows
reduced audible noise and smaller boost output
capacitors.
The LP8556 device has a full set of fault-protection
features that ensure robust operation of the device
and external components. The set consists of input
undervoltage lockout (UVLO), thermal shutdown
(TSD), overcurrent protection (OCP), up to 6 levels of
overvoltage protection (OVP), LED open and short
detection.
The LP8556 device operates over the ambient
temperature range of –30°C to +85°C. It is available
in space-saving 20-pin DSBGA and 24-pad WQFN
packages.
Device Information
(1)
PART NUMBER PACKAGE BODY SIZE
LP8556
DSBGA (20) 2.401 mm × 1.74 mm (MAX)
WQFN (24) 4.00 mm × 4.00 mm (NOM)
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
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