CXLC8996A高性能升压调节器4通道LED驱动器低损耗线性调节器LDO门脉冲调制器GPM电压检测器VCOM缓冲器用于有源矩阵薄膜晶体管TFT液晶显示器LCD的VGH电荷泵控制器高开关频率1.2MHz电流模式稳压器集成20V N沟道0.2ΩMOSFET

CXLC8996A包括高性能升压调节器、4通道LED驱动器、低损耗线性调节器（LDO）、门脉冲调制器（GPM）、电压检测器、VCOM缓冲器（单位增益OPA）和用于有源矩阵薄膜晶体管（TFT）液晶显示器（LCD）的VGH电荷泵控制器。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（640kHz或1.2MHz）电流模式稳压器，集成20V N沟道0.2ΩMOSFET，允许使用超小型电感和陶瓷电容。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。该装置能从低至2.8V的输入端产生高达18V的输出电压，软启动由外部电容器编程，设置输入电流的斜坡率。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。使用FREQ2管脚在640kHz到2MHz的范围内调整开关频率。它还集成了一个提供高输出功率的40V n沟道MOSFET。四通道电流驱动器是恒流驱动的理想选择，匹配度小于3%。为了设置最大驱动电流，ISET引脚用于确定参考电流。电流驱动器的每个通道被设置为该参考电流的1300倍。可以使用一个PWM管脚在100Hz到20kHz的范围内进行PWM调光。开路LED串自动禁止通道进入过电压保护。低压差（LDO）线性稳压器在输入电压为3.3V时能提供高达350mA的电流，采用内部PMOS作为通电器件。适用于定时控制器的供电电压。GPM由来自定时控制器的帧信号控制，以调制栅极导通电压VGHM，VGHM起到闪烁补偿电路的作用，以减小栅极线和像素之间的耦合效应。它还可以在通电时延迟栅极导通电压，以实现栅极驱动芯片的校正通电顺序。通电延迟时间和栅极导通电压下降时间均由外部电容和电阻编程。电压检测器监测电源电压，在检测到的电压过低时发出复位信号。检测电平由外部电阻分压器决定，延迟时间由外部电容器编程。VCOM缓冲器可以驱动LCD VCOM电压，该电压具有高短路电流（150mA）、快速转换速率（12V/μs）、宽带宽（12MHz）和轨对轨输入/输出。VGH电荷泵控制器提供可调节的TFT栅极开启电压。正电荷泵的调节由内部比较器产生，该比较器感测输出电压并将其与内部参考电压进行比较

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 CXLC8996A includes a high-performance boost regulator, 4-channel LED driver, a low dropout linear regulator (LDO), a gate pulse modulator (GPM), a voltage detector, a VCOM buffer (unity-gain OPA), and a VGH charge pump controller 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 (640kHz or 1.2MHz) current-mode regulator with an integrated 20V N-Channel 0.2Ω 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. Soft-Start is programmed by external capacitor, which sets the input-current ramp-rate. The LED driver automatically regulated supply voltage for the LED light bars without the need to calculate the output for different LED types. A FREQ2 pin is applied to adjust switching frequency in the range of 640kHz to 2MHz. It also integrates a 40V n-channel MOSFET that provides high output power. The 4-channel current driver is ideal for constant current driving, and, well matched less than 3%. To set the maximum driving current, the ISET pin is used to determine reference current. Each channel of the current drivers is set to 1300 times of this reference current. A PWM pin can be used to perform PWM dimming from the range of 100Hz to 20kHz. Open LED-string automatically disable the channel from entering over voltage protection. The low-dropout (LDO) linear regulator can supply up to 350mA current while input voltage is 3.3V. It uses an internal PMOS as the pass device. It is suitable for the supply voltage of the timing controller. The GPM is controlled by frame signals from timing controller to modulate the Gate-On voltage, VGHM, which acts a flicker compensation circuit to reduce the coupling effect between gate lines and pixels. It also can delay the Gate-On voltage while power-on for achieving a corrected power-on sequence for gate driver ICs. Both of power-on delay time and the falling time of the Gate-On voltage are programmable by external capacitor and resistor. The voltage detector monitors the supply voltage to issue a reset signal while the detected voltage is too low. The detecting level is decided by an external resistor divider and the delay time is programmable by an external capacitor. 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. The VGH charge pump controller provides regulated TFT Gate-On voltage. The regulation of the positive charge pump is generated by the internal comparator that senses the output voltage and compares it with an internal reference.

   产品特点 返回TOP

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„ 2.5V to 5.5V Input Supply Range 

„ Boost Regulator 

Š 640kHz/1.2MHz Fixed Frequency 

Š Current-Mode Control 

Š Fast Transient Response to Pulse Load 

Š ±1% Accurate Output Voltage 

Š Built-In 20V/2A, 0.2Ω N-Channel MOSFET 

Š High Efficiency up to 90% 

Š Programmable Soft-Start 

Š Over-Current Protection 

Š Output Under-Voltage Protection 

„ White-LED Driver 

Š Wide 4.2V to 24V Input Supply Range 

Š Adjustable Switching Frequency 

Š 40V/2A, 0.3Ω n-channel MOSFET 

Š Input Under-Voltage Protection 

Š Over Current Protection 

Š Over Voltage Protection 

Š Maximum Programmable LED Channel Current 50mA 

Š Maximum 3% Matching between Channels 

Š 100Hz~20kHz PWM Dimming 

„ High-Performance Operational Amplifiers 

Š ±150mA Output Short-Circuit Current 

Š 12V/μs Slew Rate 

Š 12MHz, -3dB Bandwidth 

Š Rail-to-Rail Input and Output 

„ Low Dropout Voltage Linear Regulator 

Š 350mA Maximum Output Current 

Š Adjustable Output Voltage 

„ On-Chip GPM Controller 

Š Adjustable Falling Time and Power-On Delay 

Š Flicker Compensator 

Š Power-On Sequence Control 

„ Charge pump for VGH regulation 

„ Low Voltage Detector 

 Š Programmable Detecting Voltage and Delay Time 

„ Thermal Protection 

„ RoHs Compliant 

„ TQFN5X5-40 and TQFN3.8X6.2-44 Package

   应用范围 返回TOP

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„ Notebook Computer Displays 

„ UMPCs 

„ LCD Monitor

   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