CXLC8988 CXLC8989包括一个高性能的升压调节器、一个降压升压控制器、一个高压电荷泵调节器、3个VCOM缓冲器（单位增益OPA）、开漏拉高VGLC信号发生器和7通道电平移位器，具有用于有源矩阵薄膜晶体管（TFT）液晶显示器（LCD）的可调栅极阴影功能。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（1.2兆赫）电流模式稳压器，带有集成的20V/0.1ΩNMOS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，为电平移位器供电。电平移位器将显示定时控制器（TCON）产生的逻辑电平控制信号转换为LCD面板所需的高电平信号。电平移位器输出的每个通道使用低阻抗晶体管来实现快速上升和下降时间，即使在驱动LCD应用中的电容负载时也是如此。通道1到6支持栅极电压阴影。它们分为两组，每组都有自己的阴影放电电阻输出。外部R-C定时器通过DTS输入定义着色周期。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。
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[ CXLC8988 ]
目录
7.相关产品
产品概述 返回TOP
The CXLC8988 CXLC8989 includes a high-performance boost regulator, a buck-boost controller, a high voltage charge pump regulator, 3 VCOM buffers (unity-gain OPA), open-drain pull high VGLC signal generator and 7-channel level shifter with adjustable gate shading function 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/0.1Ω 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 the level shifters. The level shifters transform the logic-level control signals generated by the display timing controller (TCON) into the high-level signals needed by LCD panel. Each channel of level shifter output uses low impedance transistors to achieve fast rising and falling time, even when driving the capacitive loads present in LCD applications. Channel 1 to 6 supports gate voltage shading. They are organized in two groups, each with its own shading discharge resistor output. External R-C timer defines shading period though the DTS input. 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.
产品特点 返回TOP
„ 2.6V~5.5V Supply Range
„ Current Mode Boost Regulator for AVDD
Š 0.1Ω/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 VGOFF
Š Fixed 600kHz Switching Frequency
Š Up to 85% Efficiency
Š 1% Output Regulation
„ Charge Pump Regulator for VGON
„ 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
„ 7-Channel Level Shifter
Š +33V Highest Voltage Level
Š -30V Lowest Voltage Level
Š Maximum 1μs Rising/Falling Time
Š 300mA Peak Current
Š 15mA Continuous Current
Š Adjustable Gate Shading Function
„ Opened Drain Pull High VGLC Signal
„ Protections:
Š Input Under Voltage Lockout (UVLO)
Š Over Current Protection for AVDD (OCP)
Š Output Under Voltage Protection for AVDD, GON and GOFF (UVP)
Š Output Over Voltage Protection for AVDD, GON and GOFF (OVP)
Š Operational Amplifier Short Circuit Protection (SCP)
Š Over Temperature Protection (OTP)
„ TQFN6x6-48L Package
„ RoHS Compliant
应用范围 返回TOP
„ 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
电路原理图 返回TOP
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Integrated PMIC for LCD |
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Part NO. |
Vin(V) min. |
Vin(V) max. |
FSW (kHz) |
ILX (A) |
VLX (V) |
OPAS/ R(V/μs |
OPAI SCmA |
Note |
Package |
|
2.5 |
5.5 |
1200 |
3 |
18 |
40 |
200 |
Async-Boost,VGH/VGL Charge-Pump, VCOM,GPM, Voltage Detector |
TQFN4X4-24 |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
2.6 |
5.5 |
600/ 1200 |
3 |
20 |
20 |
200 |
Async-Boost,VGH Regulator,OPA*3,Buck -Boost VGL with Temp. Compensation |
QFN5X5-32 |
|
|
8 |
14 |
750 |
5 |
24 |
30 |
200 |
Async-Boost,Async-Buck, OPA,VGON and VGOFF Regulator,GPM,VGH Temp. Compensation,I2C |
TQFN6X6-40 |
|
|
2.5 |
5.5 |
1200 |
4.5 |
18 |
-- |
-- |
Async-Boost, VGHM,VGH/VGOFF Charge-Pump |
TQFN5X5-20 |
|
|
2.5 |
5.5 |
1200 |
3 |
18 |
40 |
200 |
Async-Boost,VGH/VGL Charge-Pump, VCOM, GPM,Voltage Detector |
TQFN4X4-24 |
|
|
2.5 |
5.5 |
1200 |
1.8 |
20 |
12 |
150 |
Async-Boost,VGH/VGL Charge-ump,VCOM, |
TQFN3X3-16 |
|
|
2.5 |
5.5 |
1200 |
1.8 |
20 |
12 |
150 |
Async-Boost,VGH/VGL Charge-Pump,VCOM, |
TQFN3X3-16 |
|
|
2.5 |
5.5 |
640/ 1200 |
2 |
20 |
12 |
150 |
Async-Boost, VGH Charge-Pump,VCOM, GPM, Voltage Detector,LDO |
TQFN4X4-24 |
|
|
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 |
|
|
2.5 |
5.5 |
640/ 1200 |
2 |
20 |
12 |
150 |
Async-Boost,VGH Charge-Pump,VCOM, GPM, Voltage Detector |
TQFN4X4-24 |
|
|
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 |
|
|
8 |
14 |
500/ 750 |
2.3 |
19 |
-- |
-- |
Async-Boost,Async-Buck,VGH/VGL,Charge-Pump |
TSSOP-28(FD) |
|
|
8 |
14 |
500/ 750 |
3 |
20 |
45 |
200 |
Async-Boost,Async-Buck, VGH/VGL Charge-Pump, GPM,VCOM,Voltage Detector,HV LDO |
TQFN7X7-48 |
|
|
9.5 |
14 |
500~ 2000 |
3.5 |
20 |
-- |
-- |
Async-Boost,Async-Buck,VGON and VGOFF Regulator |
TQFN5X5-28 |
|
|
8 |
14 |
750/ 1000 |
5 |
24 |
-- |
-- |
Async-Boost,Sync-Buck*2,Async-Buck,VGON and VGOFF Regulator,GPM,VGH Temp.Compensation,I2C |
TQFN6X6-40 |
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