XC9268中文资料工作电压36V内置驱动晶体管 输出电流600mA 同期整流降压DC/DC转换器数据手册Torex规格书

描述 Description

The XC9268 series are 36V operation synchronous step-down DC/DC converter ICs with a built-in P-channel MOS driver transistor and N-channel MOS switching transistor. The XC9268 series has operating voltage range of 3.0V～36.0V and high-efficiency power supply up to an output current of 0.6A. Low ESR capacitors such as ceramic capacitors can be used for the load capacitor (CL).
A 0.75V reference voltage source is incorporated in the IC, and the output voltage can be set to a value from 1.0V to 25.0V usingexternal resistors (RFB1,RFB2).
1.2MHz or 2.2MHz can be selected for the switching frequency. In automatic PWM/PFM control, the IC operates by PFM control when the load is light to achieve high efficiency over the full load range from light to heavy.The soft-start time is internally set to 2.0ms (TYP.), but can be adjusted to set a longer time using an external resistor and capacitor.
With the built-in UVLO function, the driver transistor is forced OFF when input voltage becomes 2.7V or lower.The output state can be monitored using the power good function. Internal protection circuits include over current protection, short-circuit protection, and thermal shutdown circuits to enable safe use.

特性 Features

·输入电压：3.0 ~ 36V (额定40V)
·输出电压：1.0V ~ 25V
·FB电压：0.75V±1.5%精度
·振荡频率：1.2MHz2.2MHz
·最大电流：600mA
·消耗电流：12.5μA (1.2MHz)13.5μA (2.2MHz)
·控制方式：PWM/PFM Auto效率83%@12V→5V,1mA,1.2MHz
·软启动功能：外部设定（RC外部）
·保护功能：过流限制自动恢复热关断
·输出电容：陶瓷电容兼容
·工作环境温度：- 40℃ ~ + 105℃
·环保相关：对应EU RoHS 指令、无铅