内部集成电荷泵和运算放大器用于TFT LCD面板的DC-DC转换器TFT LCD DC-DC Converter with Integrated Charge Pumps and OP-AMP 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

   产品概述 返回TOPwfS嘉泰姆

      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TOPwfS嘉泰姆

wfS嘉泰姆

• 输入电压范围：2.5-5.5VwfS嘉泰姆

• 1.2MHz电流模升压转换器wfS嘉泰姆

- 内置20V/2.8A，0.16Ω N-MOSFETwfS嘉泰姆

- 效率高达90%wfS嘉泰姆

- ±1%的输出精度</p>

- 快速负载瞬态响应</p>

- 过流保护wfS嘉泰姆

- 输出欠压保护wfS嘉泰姆

• 600KHz工作频率的负电荷泵为TFT栅极提供关断电压wfS嘉泰姆

• 600KHz工作频率的正电荷泵为TFT栅极提供导通电压</p>

• 高速大电流18V VCOM 缓冲器</p>

- ±500mA输出短路电流wfS嘉泰姆

- 压摆率45V/μswfS嘉泰姆

- 20MHz带宽wfS嘉泰姆

- 轨对轨的输入、输出</p>

• 上电时序控制wfS嘉泰姆

• 过温保护wfS嘉泰姆

• 3mm×3mm TQFN-16封装wfS嘉泰姆

• 符合RoHS规范及Pb-Free Halogen-FreewfS嘉泰姆

2.5V to 5.5V Input Supply RangewfS嘉泰姆

1.2MHz Current-Mode Step-Up ConverterwfS嘉泰姆

- Built-In 20V/2.8A, 0.16
N-Channel MOSFETwfS嘉泰姆

- High Efficiency Up to 90%wfS嘉泰姆

- ±1% Accurate Output VoltagewfS嘉泰姆

- Fast Transient Response to Pulse LoadwfS嘉泰姆

- Over-Current ProtectionwfS嘉泰姆

- Output Under-Voltage ProtectionwfS嘉泰姆

600kHz Negative Charge Pump Driver for VGLwfS嘉泰姆

600kHz Positive Charge Pump Driver for VGHwfS嘉泰姆

High Speed High Current 18V VCOM BufferwfS嘉泰姆

- ±500mA Output Short-Circuit CurrentwfS嘉泰姆

- 45V/μs Slew RatewfS嘉泰姆

- 20MHz, -3dB BandwidthwfS嘉泰姆

- Rail-to-Rail Input and OutputwfS嘉泰姆

Power-On Sequence ControlwfS嘉泰姆

Thermal-Overload ProtectionwfS嘉泰姆

3mm′3mm TQFN-16 PackagewfS嘉泰姆

RoHS Compliant and 100% Lead (Pb)-FreewfS嘉泰姆

Halogen-FreewfS嘉泰姆

   应用范围 返回TOPwfS嘉泰姆

wfS嘉泰姆

• 平板电脑wfS嘉泰姆

• 笔记本显示器wfS嘉泰姆

Tablet PCswfS嘉泰姆

Notebook DisplayswfS嘉泰姆

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