CXLC8955是一款用于电子纸显示器的单芯片、多输出PMIC。两个PWM变换器分别产生正电压和负电压，由两个电荷泵分别为源极驱动器和栅极驱动器提供更高的电压。两个集成电源开关用于在关机模式下断开这些PWM输出与负载的连接。所有的PWM和电荷泵输出电压都可以通过外部电阻进行调节，它们的电源开/关定时可以通过I2C接口单独编程。一个精确的VCOM电压，用于底板偏置，可通过I2C接口从-0.3V到-2.85V进行调节，每步10mV。VCOM能够在至少100mA的电流下，根据面板条件，产生和吸收电流。一个外部负温度系数（NTC）电阻被纳入感测远程温度。这种遥感温度可以用来监测电池的表面温度，以避免过热。温度数据根据预设的转换表从TS引脚上的电压映射。大约每250毫秒，CXLC8955执行电压/温度转换，并将温度数据以2的补码格式存储在寄存器中
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[ CXLC8955 ]
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7.相关产品
产品概述 返回TOP
The CXLC8955 is a single chip, multi outputs PMIC for Epaper displays. Two PWM converters respectively generate positive and negative voltages which are boosted to higher voltage by two charge pumps for both source and gate drivers. Two integrated power switches are used to disconnect these PWM outputs from load in shutdown mode. All PWM and charge pump output voltages are adjustable by external resistors and their power on/off timings can be individually programmable via I2C interface. One accurate VCOM voltage, for backplane biasing, is adjustable via I2C interface from -0.3V to -2.85V with 10mV per step. The VCOM is capable of sourcing and sinking current, depending on panel condition, at lease 100mA. An external negative temperature coefficient(NTC) resistor is incorporated to sense remote temperature. This remote temperature sensing can be used to monitor the battery’s surface temperature to avoid over heating. The temperature data is mapped from the voltage on TS pin according to a preset conversion table. Approximately every 250ms the CXLC8955 executes the voltage/temperature conversion and stores the temperature date in register in two’s complement format. The CXLC8955 is available in a space saving TQFN5x5 32-pin package and is specified over the -40oC to +85oC extended temperature range.
产品特点 返回TOP
· Single Chip Power Management Solution for Epaper Displays
· Input SupplyVoltage Range: 3.0~5.5V
· I 2C Series Interface
· Boost Converter for Positive Rail Base (HVINP)
· Inverting Buck-Boost Converter for Negative Rail Base (HVINN)
· Accurate Voltage Tracking between HVINP and HVINN: +50mV
· Integrated Two Power Switches with Soft-start Control for Source Driver Supply -POS: +15V/120mA -NEG: -15V/120mA
· Two Charge Pump for Gate Driver Supply
-DGVDD: +22V/20mA
-DGVEE:-22V/20mA
· Accurate and Adjustable VCOM Voltage for Panel Backplane Biasing
- -0.3 to -2.85V/100mA, 10mV per step
-8-bit Control
· Programmable Turn-on/Turn-off Timing in every Output Voltage
· Remote Temperature Sensing
· POK Output
· FAULTOutput
· Enable Input
· Current Limit Protection
· Over Temperature Protection
· Fault Events Report in Every Output for Easy Debugging
· 1MHz Fixed PWM Frequency
· Up to 85% efficiency for the Boost
· Internal Soft Start Control
· Available in TQFN5x5-32 Package
· Halogen and Lead Free Available (RoHS Compliant)
应用范围 返回TOP
· E-paper Display
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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PMIC > LCD Bias Converter |
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Part_No |
Package |
Topology |
Buffer for Vcom |
Switch Current Limit (A) |
Vin (V) |
Fmax Khz |
SYNC ASYNC |
PFM/PSM |
Vref (V) |
R-Top milohm |
Iq(No load) (uA) |
En pin |
POK |
Charge Pump Output |
|
|
min |
max |
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|
TQFN3 x3-20 |
Boos tCharge pump |
Yes |
2 |
2.7 |
5.5 |
1500 |
ASYNC |
PSM/PWM |
1.25 |
500 |
300 |
Yes |
No |
Two set for VGH, VGL |
|
|
TQFN3 x3-20 |
Boos tCharge pump |
2 |
2.9 |
5.5 |
1000 |
ASYNC |
PSM/PWM |
1.25 |
Yes |
No |
Two set for VGH,VGL |
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|
TQFN5 x5-32 |
Boost Charge pump |
Yes |
1.8 |
3 |
5.5 |
1000 |
ASYNC |
PSM/PWM |
1.25 |
250 |
2000 |
Yes |
No |
Two set for VGH,VGL |
|
|
WLCSP1.92 x1.28-15 |
Boost Charge pum |
0.6 |
2.5 |
5.5 |
1800 |
SYNC |
PSM/PWM |
540 |
Yes |
No |
Two set for VGH,VGL |
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◀ 上一篇:CXLC8954两个高性能升压转换器和两个用于TFT LCD和背光应用的电荷泵控制器固定频率的PWM开关调节器1.0兆赫的开关频率允许使用低剖面感应器和陶瓷电容器最小化液晶面板设计的厚度
下一篇▶:CXLC8956升压结构的集成电路提供正负电压输出驱动同步增压集成电路同步电荷泵输出驱动提供输入电源输出电源正压和负压电容同步整流用全集成mosfet集成补偿反馈电路I2C可调输出电压
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