CXLC8958为平板电脑和笔记本电脑的TFT LCD面板提供电源解决方案，它能在2.5-5.5V的电源电压下工作。CXLC8958集成了一个升压转换器、正负电荷泵和一个高速VCOM缓冲器。升压转换器为液晶面板的源驱动器芯片供电，采用外部补偿，内置2.8A峰值电流限制的N-MOSFET，较高的工作频率可以使用较小的电感和电容。它采用固定频率的峰值电流模控制架构，补偿网络简单，并可获得较快的负载瞬态响应。正、负电荷泵产生正、负两路供电电源，为TFT-LCD的栅驱动器芯片供电。高速VCOM缓冲器特性主要有：500mA的短路电流，20MHz带宽，45V/μs压摆率和轨对轨的输入、输出电压范围。CXLC8958集成了上电时序控制电路，还提供了欠压保护、过压保护、过温保护等功能，确保芯片安全可靠的工作
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[ CXLC8958 ]
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产品概述 返回TOP
CXLC8958为平板电脑和笔记本电脑的TFT LCD面板提供电源解决方案，它能在2.5-5.5V的电源电压下工作。CXLC8958集成了一个升压转换器、正负电荷泵和一个高速VCOM缓冲器。升压转换器为液晶面板的源驱动器芯片供电，采用外部补偿，内置2.8A峰值电流限制的N-MOSFET，较高的工作频率可以使用较小的电感和电容。它采用固定频率的峰值电流模控制架构，补偿网络简单，并可获得较快的负载瞬态响应。正、负电荷泵产生正、负两路供电电源，为TFT-LCD的栅驱动器芯片供电。高速VCOM缓冲器特性主要有：500mA的短路电流，20MHz带宽，45V/μs压摆率和轨对轨的输入、输出电压范围。CXLC8958集成了上电时序控制电路，还提供了欠压保护、过压保护、过温保护等功能，确保芯片安全可靠的工作。CXLC8958采用16引脚TQFN封装，封装的面积是3mm×3mm。工作温度范围-40oC到+85oC。The CXLC8958 generates power supply rails for thin-film transistor (TFT) liquid-crystal display (LCD) panels in tablet PCs and notebooks operated from 2.5V to 5.5V input supply. The device integrates a step-up converter, positive and negative charge pumps, and a high speed VCOM buffer. The external compensated step-up converter, providing the regulated supply voltage for the panel source driver ICs, features an internal power MOSFET and high frequency operation allowing to use small inductors and capacitors. The step up converter uses fixed-frequency peak current mode control architecture which provides fast load-transient response and easy compensation. A 2.8A peak current limit for the internal switch protects power supply fault condition. The regulated positive and negative charge pump regulators generate the positive and negative supply rails for the TFT LCD gate resistive voltage-divider ICs. The high speed VCOM buffer features 500mA short circuit current, 20MHz bandwidth, fast slew rate 45V/μs, and rail-to-rail inputs and outputs. The CXLC8958 includes internal power-up sequencing, over/under voltage protections of the boost converter, and over temperature protection to ensure in safe operating. The CXLC8958 are available in a 16-pin 3mm×3mm TQFN packages.
产品特点 返回TOP
• 输入电压范围：2.5-5.5V
• 1.2MHz电流模升压转换器
- 内置20V/2.8A，0.16Ω N-MOSFET
- 效率高达90%
- ±1%的输出精度
- 快速负载瞬态响应
- 过流保护
- 输出欠压保护
• 600KHz工作频率的负电荷泵为TFT栅极提供关断电压
• 600KHz工作频率的正电荷泵为TFT栅极提供导通电压
• 高速大电流18V VCOM 缓冲器
- ±500mA输出短路电流
- 压摆率45V/μs
- 20MHz带宽
- 轨对轨的输入、输出
• 上电时序控制
• 过温保护
• 3mm×3mm TQFN-16封装
• 符合RoHS规范及Pb-Free Halogen-Free
2.5V to 5.5V Input Supply Range
1.2MHz Current-Mode Step-Up Converter
- Built-In 20V/2.8A, 0.16 N-Channel MOSFET
- High Efficiency Up to 90%
- ±1% Accurate Output Voltage
- Fast Transient Response to Pulse Load
- Over-Current Protection
- Output Under-Voltage Protection
600kHz Negative Charge Pump Driver for VGL
600kHz Positive Charge Pump Driver for VGH
High Speed High Current 18V VCOM Buffer
- ±500mA Output Short-Circuit Current
- 45V/μs Slew Rate
- 20MHz, -3dB Bandwidth
- Rail-to-Rail Input and Output
Power-On Sequence Control
Thermal-Overload Protection
3mm′3mm TQFN-16 Package
RoHS Compliant and 100% Lead (Pb)-Free
Halogen-Free
应用范围 返回TOP
• 平板电脑
• 笔记本显示器
Tablet PCs
Notebook Displays
技术规格书（产品PDF) 返回TOP
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产品封装图 返回TOP
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电路原理图 返回TOP
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LCD/OLED 显示频偏置电压 > LCD面板电源 |
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Part Number |
remark |
Vin (V) |
No. of DC/DC |
No. Of LDO/OP |
Vout (max) (V) |
IQ (mA) |
Isw (A) |
Freq. (KHz) |
Package |
|
620kHz/1.25MHz Step-up DC/DC Converter |
2.5 ~ 5.5 |
1 |
0 |
28 |
0.5 |
2.1 |
620/1250 |
MSOP-8 |
|
|
TFT LCD DC-DC Converter with Integrated Charge Pumps and OP-AMP |
2.5 ~ 5.5 |
1 |
1(OP) |
18 |
1 |
2.8 |
1200 |
TQFN-16 |
|
|
TFT LCD DC-DC Converter with Integrated Charge Pumps OP-AMP and HV-Switch |
2.5 ~ 5.5 |
1 |
0/1 |
20 |
1 |
3.5 |
1200 |
TQFN-24 |
|
|
Multi-Output Power Supplies for TV TFT LCD Panels |
8 ~ 14.7 |
2 |
0 |
18 |
1.5 |
4.6 |
500/750 |
TSSOP-28(EP) |
|
|
Dual Channel DC-DC Converter for AMOLED |
2.5 ~ 4.5 |
2 |
0 |
8/-6 |
2 |
1.5 |
1400 |
TDFN-12 |
|
下一篇▶:CXLC8959用于监视器或笔记本TFT-LCD面板供电的专用芯片直流输入电压为2.5V-5.5V集成升压转换器正负电荷泵快速VCOM缓冲器和高压开关四个部分升压转换器内置了功率开关管峰值电流3.5A
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