The selectable 620kHz and 1.25MHz allows smaller inductors and faster transient response. An external compensation pin gives the user greater flexibility in setting loop compensation allowing the use of low ESR Ceramic output capacitors. Soft-start is controlled with an external capacitor, which determines the input current ramp rate during start-up
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[ CXLC8957 ]"
目录
7.相关产品
产品概述 返回TOP
CXLC8957是一款高性能的电流模，可选择工作频率的PWM升压转换器。它具有2.1A，170mΩ的内部功率开关管，可以将5V输入电压转换成12V电压输出，并且输出电流达到500mA。620KHz和1.25MHz的可选频率允许选择较小的电感、更快的瞬态响应。用户可以利用外部补偿引脚设定环路补偿，提高了设计灵活性，允许在输出端接低ESR的陶瓷输出电容。软启动时间可以通过外接电容设定，从而确定启动时输入电流的上升斜率。当关断时，静态电流小于10μA。最低工作电压可达2.5V。这些特点以及1.25MHz开关频率使得芯片成为便携式设备及TFT-LCD显示器的理想解决方案。CXLC8957采用MSOP-8封装，工作温度范围为-40°C 到 +85°C。The CXLC8957 is a high performance current mode, PWM step-up converter with pin selectable operating frequency. With an internal 2.1A, 170mΩ MOSFET, it can generate 12V at up to 500mA output current from a 5V supply. The selectable 620kHz and 1.25MHz allows smaller inductors and faster transient response. An external compensation pin gives the user greater flexibility in setting loop compensation allowing the use of low ESR Ceramic output capacitors. Soft-start is controlled with an external capacitor, which determines the input current ramp rate during start-up. When shut down, it draws＜10μA of current and can operate down to 2.5V input supply. These features along with 1.25MHz switching frequency makes it an ideal device for portable equipment and TFT-LCD displays. The CXLC8957 is available in an 8-pin MSOP package. The device is specified for operation over the full -40°C to +85°C temperature range.
产品特点 返回TOP
• 效率高达90%
• 2.1A，170mΩ功率开关管
• 输入电压范围2.5V ~ 5.5V
• 可调输出电压最高达28V
• 620KHz/1.25MHz可选开关频率
• 可调软启动功能
• 内置热保护功能
• 小尺寸MSOP-8封装
• 符合RoHS规范及Pb-Freez 90% Efficiency
z 2.1A, 170mΩ Power MOSFET
z 2.5V to 5.5V Input Range
z Adjustable Output Voltage up to 28V
z 620kHz/1.25MHz Switching Frequency Selection z Adjustable Soft-Start
z Internal Thermal Protection
z Small MSOP-8 package
z RoHS Compliant and 100% Lead (Pb)-Free
应用范围 返回TOP
• TFT-LCD显示器
• DSL调制解调器
• 机顶盒
• PCMCIA接口卡
• 便携式设备
• 手持设备
z TFT-LCD Displays
z DSL Modems
z Set-Top Boxes
z PCMCIA Cards
z Portable Equipment
z Handheld Devices
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
相关芯片选择指南 返回TOP 更多同类产品......
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LCD/OLED 显示频偏置电压 > LCD面板电源 |
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Part Number |
remark |
Vin (V) |
No. of DC/DC |
No. Of LDO/OP |
Vout (max) (V) |
IQ (mA) |
Isw (A) |
Freq. (KHz) |
Package |
|
620kHz/1.25MHz Step-up DC/DC Converter |
2.5 ~ 5.5 |
1 |
0 |
28 |
0.5 |
2.1 |
620/1250 |
MSOP-8 |
|
|
TFT LCD DC-DC Converter with Integrated Charge Pumps and OP-AMP |
2.5 ~ 5.5 |
1 |
1(OP) |
18 |
1 |
2.8 |
1200 |
TQFN-16 |
|
|
TFT LCD DC-DC Converter with Integrated Charge Pumps OP-AMP and HV-Switch |
2.5 ~ 5.5 |
1 |
0/1 |
20 |
1 |
3.5 |
1200 |
TQFN-24 |
|
|
Multi-Output Power Supplies for TV TFT LCD Panels |
8 ~ 14.7 |
2 |
0 |
18 |
1.5 |
4.6 |
500/750 |
TSSOP-28(EP) |
|
|
Dual Channel DC-DC Converter for AMOLED |
2.5 ~ 4.5 |
2 |
0 |
8/-6 |
2 |
1.5 |
1400 |
TDFN-12 |
|
