CXLC8985高性能升压调节器VCOM缓冲器VGH电荷泵驱动器VGL电荷泵驱动器和用于有源矩阵薄膜晶体管TFT液晶显示器LCD的白色LED驱动器boost转换器为面板源驱动器ic提供稳压电源

CXLC8985包括高性能升压调节器、VCOM缓冲器（单位增益OPA）、VGH电荷泵驱动器、VGL电荷泵驱动器和用于有源矩阵薄膜晶体管（TFT）液晶显示器（LCD）的白色LED驱动器。boost转换器为面板源驱动器ic提供稳压电源。该转换器是一个高开关频率（1.2兆赫）电流模式稳压器，集成了20伏N通道0.7ΩMOSFET，允许使用超小电感和陶瓷电容。它提供了对脉冲加载的快速瞬态响应，同时达到了90%以上的效率。该装置可从低至2.8V的输入端产生高达18V的输出电压，VCOM缓冲器可驱动具有高短路电流（150mA）、快速转换速率（12V/μs）、宽带宽（12MHz）和轨对轨输入/输出的LCD VCOM电压。正电荷泵驱动器和负电荷泵驱动器提供可调节的输出电压VGH和VGL，以偏置TFT。两个电荷泵驱动器都以600kHz的开关频率工作。LED驱动器自动调节LED灯条的电源电压，无需计算不同LED类型的输出。它还集成了一个提供高输出功率的20V n沟道MOSFET。低参考电压使电流整定电阻器的功率损耗最小化。一个使能输入可以反复脉冲调整LED的亮度。LED驱动器的boost变换器采用过电流保护和过电压保护，保证了系统的安全运行。CXLC8985包括内部通电顺序、升压转换器的过压/欠压保护和确保安全运行的过热保护。

目录

1.产品概述       2.产品特点     

3.应用范围       4.技术规格书下载（PDF文档）

5.产品封装       6.电路原理图  

7.相关产品

   产品概述 返回TOP

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The CXLC8985 includes a high-performance boost regulator, a VCOM buffer (unity gain OPA), a VGH charge pump driver, a VGL charge pump driver, and white LED driver for active-matrix thin-film transistor (TFT) liquid-crystal displays (LCDs). The boost converter provides the regulated supply voltage for the panel source driver ICs. The converter is a high switching frequency (1.2MHz) current mode regulator with an integrated 20V N-Channel 0.7Ω MOSFET that allows the use of ultra-small inductors and ceramic capacitors. It provides fast transient response to pulsed loading while achieving efficiency over 90%. The device can produce output voltage as high as 18V from an input as low as 2.8V. The VCOM buffer can drive the LCD VCOM voltage that features high short-circuit current (150mA), fast slew rate (12V/μs), wide bandwidth (12MHz) and rail-to-rail input/output. A positive and a negative charge-pump driver provide adjustable regulated output voltages VGH and VGL to bias the TFT. Both charge-pump drivers operate with 600kHz switching frequency. The LED driver automatically regulated supply voltage for the LED light bars without the need to calculate the output for different LED types. It also integrates a 20V n-channel MOSFET that provides high output power. The low reference voltage minimized the power loss across the current-setting resistor. An enable input can be pulsed repeatedly to adjust LED’s brightness. The boost converter of the LED driver incorporates over current protection and over voltage protection to ensure safety operation. The CXLC8985 includes internal power-up sequencing, over/under voltage protections of the boost converter, and over temperature protection to ensure in safe operating. The CXLC8985 is available in a 24-pin 4X4 TQFN package.

   产品特点 返回TOP

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„ 2.5V to 5.5V Input Supply Range 

„ Active-High Enable Control 

„ 1.2MHz Current-Mode Boost Regulator 

Š Fast Transient Response to Pulse Load 

Š ±1% Accurate Output Voltage 

Š Built-In 20V/1.8A, 0.7Ω N-Channel MOSFET 

Š High Efficiency up to 90% 

Š Over-Current Protection 

Š Output Under-Voltage Protection 

„ High-Performance Operational Amplifier 

Š ±150mA Output Short-Circuit Current 

Š 12V/μs Slew Rate Š 12MHz, -3dB Bandwidth 

Š Rail-to-Rail Input and Output 

„ 600kHz Negative Charge Pump Driver for VGL 

„ 600kHz Positive Charge Pump Driver for VGH 

„ White LED Driver Š 1MHz Switching Frequency 

Š 20V/1.2A, 0.3Ω N-channel MOSFET 

Š Input Under Voltage Protection 

Š Over Current Protection 

Š Over Voltage Protection 

Š Digital Dimming Control 

„ Power-On Sequence Control 

„ Thermal-Overload Protection 

„ RoHs Compliant 

„ TQFN4X4-24 Package

   应用范围 返回TOP

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„ Notebook Computer Displays 

„ UMPCs 

„ Medium Size LCD Panel

   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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Integrated   PMIC for LCD
Part NO.	Vin(V) min.	Vin(V) max.	FSW (kHz)	ILX (A)	VLX (V)	OPAS/ R(V/μs	OPAI SCmA	Note	Package
CXLC8984	2.5	5.5	1200	3	18	40	200	Async-Boost,VGH/VGL Charge-Pump, VCOM,GPM, Voltage Detector	TQFN4X4-24
CXLC8985	2.5	5.5	1200	1.8	20	12	150	Async-Boost, VCOM,VGH/VGL Charge-Pump, 1-CH   WLED Driver with EN,LXB=20V/1.2A	TQFN4X4-24
CXLC8986	2.5	5.5	1200	2	20	12	200	Async-Boost,VGL Regulator,LDO,GPM,OPA, Voltage Detector,6-CH WLED Driver,30mA/CH	TQFN5X5-40
CXLC8987	2.5	5.5	600	2	20	12	200	Async-Boost,VGL Regulator,LDO,GPM,OPA, Voltage Detector,6-CH WLED Driver,30mA/CH	TQFN5X5-40
CXLC8988	2.6	5.5	600/ 1200	3	20	20	200	Async-Boost,VGH Regulator,OPA*3,Buck-Boost VGL  Temp. Compensation,7-CH-33V~+33V Level-Shifter	TQFN6X6-48
CXLC8989	2.6	5.5	600/ 1200	--	--	20	200	Async-Boost,VGH Regulator,OPA*3,Buck-Boost VGL  Temp. Compensation,7-CH-33V~+33V Level-Shifter	QFN6X6-48
CXLC8990	2.6	5.5	600/ 1200	3	20	20	200	Async-Boost,VGH Regulator,OPA*3,Buck -Boost VGL with Temp. Compensation	QFN5X5-32
CXLC8991	8	14	750	5	24	30	200	Async-Boost,Async-Buck, OPA,VGON and VGOFF Regulator,GPM,VGH Temp. Compensation,I2C	TQFN6X6-40
CXLC8992	2.5	5.5	1200	4.5	18	--	--	Async-Boost,   VGHM,VGH/VGOFF Charge-Pump	TQFN5X5-20
CXLC8993	2.5	5.5	1200	3	18	40	200	Async-Boost,VGH/VGL Charge-Pump, VCOM, GPM,Voltage Detector	TQFN4X4-24
CXLC8994	2.5	5.5	1200	1.8	20	12	150	Async-Boost,VGH/VGL Charge-ump,VCOM, CXLC8994A With EN,CXLC8994S With XAO	TQFN3X3-16
CXLC8994 A/S	2.5	5.5	1200	1.8	20	12	150	Async-Boost,VGH/VGL Charge-Pump,VCOM,  CXLC8994A With EN,CXLC8994S With XAO	TQFN3X3-16
CXLC8995 /A	2.5	5.5	640/ 1200	2	20	12	150	Async-Boost, VGH Charge-Pump,VCOM, GPM, Voltage Detector,LDO	TQFN4X4-24
CXLC8996A	2.5	5.5	640/ 1200	2	20	12	150	Async-Boost,VGH Charge-Pump,VCOM,LDO,GPM, Voltage Detector,4-CH WLED   Driver,50mA/CH	TQFN5X5-40 TQFN3.8X6.2
CXLC8997	2.5	5.5	640/ 1200	2	20	12	150	Async-Boost,VGH Charge-Pump,VCOM, GPM, Voltage Detector	TQFN4X4-24
CXLC8998	2.5	5.5	1200	1.8	20	12	150	Async-Boost,VGH Charge-Pump,VGL Charge-Pump, Voltage Detector,1-CH WLEDdriver,240mA/CH,HVInput	TQFN4X4-24
CXLC8999 /B	8	14	500/ 750	2.3	19	--	--	Async-Boost,Async-Buck,VGH/VGL,Charge-Pump	TSSOP-28(FD)
CXLC89100 /A	8	14	500/ 750	3	20	45	200	Async-Boost,Async-Buck, VGH/VGL Charge-Pump, GPM,VCOM,Voltage Detector,HV LDO	TQFN7X7-48
CXLC89101	9.5	14	500~ 2000	3.5	20	--	--	Async-Boost,Async-Buck,VGON and VGOFF Regulator	TQFN5X5-28
CXLC89102	8	14	750/ 1000	5	24	--	--	Async-Boost,Sync-Buck*2,Async-Buck,VGON and  VGOFF Regulator,GPM,VGH Temp.Compensation,I2C	TQFN6X6-40