PT1101--PWM step-down DC/DC with low supply current
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        PT1101是一款低工作电流的高效率PWM/VFM降压DC/DC转换控制器。它包含一个PWM控制器、一个高精度的能带隙参考源、一个误差放大器、相位补偿电路、软启动电路、保护电路、PWM/VFM切换电路、IC使能电路、输出电压检测电阻和输入电压检测电路。内部机理可以提高芯片的性能。在高负载的情况下,当IC持续处于最大占空比状态达到一定时间后,IC内部的保护电路就会工作,反复通过软启动来复位电路直到退出最大占空比状态;而在低负载的情况下,PWM/VFM切换电路将IC的工作状态切换成VFM,从而提高效率。此外,当输入电压小于或等于内置UVLO的阈值时,内置UVLO的功能就会起效,使IC处于待机状态,减小功耗,并且避免不稳定的操作。 只需几个外部元件,该IC就可以很容易构成一个低纹波高效率的降压型DC/DC转换器。在外部电阻的帮助下,输出电压可固定也可调整(可调版不含PWM/VFM切换电路)。
特点Features:
﹡Wide Range Of Input Voltage: 2.3V~18V
﹡Built-in Soft-start and Protection Function
﹡High Efficiency:Typ.90%
﹡Oscillation Frequency:500kHz
﹡High Accuracy Output Voltage:±2%
﹡Low Temperature Coefficient of Output Voltage: Typ.±100ppm/℃
﹡Standby Current:Typ.0.1μA
﹡Output Voltage:Stepwise Setting with a step of 0.1V in the range of 1.2V to 6.0V as fixed voltage type. Reference Voltage of Adjustable type is 1.0V.
﹡Small Package:SOT-23-5
﹡CMOS Output Capabilit
应用Applications:
﹡Hand-held communication equipment,cameras,video instruments such as VCRs,camcorders
﹡Battery-powered equipment
﹡Household electrical appliances
﹡手持式通讯设备,照相机,VCR,摄像机等视频设备,电池供电设备及家用电器设备,等等
>>> PT1101 中文简介:  
>>> PT1101 Data Sheet:
PT1101 Controller+Mosfet
﹡PT1101+SPP9435B 电流1-3A 常用于矿灯
﹡PT1101+SPP2301 电流0.5A-1.5A 常用便携产品
﹡SPP9435B datasheet: ﹡SPP2301 datasheet:
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