CXLC8990升压稳压器为面板源驱动芯片提供稳压电源一个高开关频率1.2MHz电流模式稳压器集成了20V/0.15ΩNMOS开关提供了对脉冲加载的快速瞬态响应实现了85%以上的效率

CXLC8990包括高性能升压调节器、降压升压控制器、高压电荷泵调节器、用于有源矩阵薄膜晶体管（TFT）液晶显示器（LCD）的3个VCOM缓冲器（单位增益OPA）。升压稳压器为面板源驱动芯片提供稳压电源。它是一个高开关频率（1.2MHz）电流模式稳压器，集成了20V/0.15ΩNMOS开关，允许使用超小型电感和陶瓷电容器。它提供了对脉冲加载的快速瞬态响应，同时实现了85%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，电压模式buck-boost控制器与外部温度传感器配合，为电平变换器提供补偿关断电压。同时电荷泵控制器调节外部电荷泵电压源，为其他装置供电。VCOM缓冲器可以驱动LCD VCOM电压，该电压具有高短路电流（200mA）、快速转换速率（20V/μs）、宽带宽（8MHz）和轨对轨输入/输出。CXLC8990具有广泛的保护功能，包括UVLO、OCP、UVP、OVP和OTP

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 CXLC8990 includes a high-performance boost regulator, a buck-boost controller, a high voltage charge pump regulator, 3 VCOM buffers (unity-gain OPA) for active-matrix thin-film transistor (TFT) liquid-crystal displays (LCDs). The boost regulator provides the regulated supply voltage for the panel source driver ICs. It is a high switching frequency (1.2MHz) current-mode regulator with an integrated 20V/0.15Ω NMOS switch that allows the use of ultra small inductors and ceramic capacitors. It provides fast transient response to pulsed loading while achieving efficiency over 85%. The device can produce output voltage as high as 18V from an input as low as 2.8V. A voltage mode buck-boost controller cooperates with external temperature sensor provide compensated gate-off voltage supply to the level shifters. While the charge pump controller regulates the external charge pump voltage source to supply for other devices. The VCOM buffer can drive the LCD VCOM voltage that features high short-circuit current (200mA), fast slew rate (20V/μs), wide bandwidth (8MHz) and rail-to-rail input/output. The CXLC8990 features extensive protection functions that include UVLO, OCP, UVP, OVP, and OTP. It is available in a QFN5X5-32 package.

   产品特点 返回TOP

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„ 2.6V~5.5V Supply Range 

„ Current Mode Boost Regulator for AVDD 

Š 0.15Ω/20V/3A Embedded NMOS switch 

Š Fixed 1.2MHz Switching Frequency 

Š Up to 85% Efficiency 

Š 1% Output Regulation 

„ Voltage Mode Buck-Boost Regulator for VGL 

Š Fixed 600kHz Switching Frequency 

Š Up to 85% Efficiency 

Š 1% Output Regulation 

„ Charge Pump Regulator for VGH 

„ 3-Channel Rail-to-Rail Unity-Gain Operational Amplifier 

Š ±200mA Output Short Circuit Current 

Š 20V/μs Slew Rate 

Š 18MHz, -3dB Bandwidth 

„ Built-In Power On Sequence and Soft Start Function 

„ Protections: 

Š Input Under Voltage Lockout (UVLO) 

Š Over Current Protection for AVDD (OCP) 

Š Output Under Voltage Protection for AVDD, VGH and VGL (UVP) 

Š Output Over Voltage Protection for AVDD, VGL (OVP) 

Š Operational Amplifier Short Circuit Protection (SCP) 

Š Over Temperature Protection (OTP) 

„ QFN5X5-32 Package 

„ RoHS Compliant

   应用范围 返回TOP

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„ LCD TV Panel 

„ LCD Monitor 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