同步整流升降压DC/DC转换器,Synchronous Rectification Buck-Boost DC/DC Converter IC, CXSB6603系列产品是内置了FET(开关)的同步整流式升降压转换器IC，由内部的PWM控制器监控输入电压和输出电压，能根据输入输出电压条件自动地从降压到升压,或从升压到降压平滑地进行工作过渡。

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    CXSB6603系列产品是内置了FET(开关)的同步整流式升降压转换器IC，由内部的PWM控制器监控输入电压和输出电压，能根据输入输出电压条件自动地从降压到升压,或从升压到降压平滑地进行工作过渡。内置了FET(开关)能减少零部件数，而且因为振荡频率高达“6MHz”，使用小型零部件(电容,线圈)。输入电压范围在2.5V～5.5V之间。由于内置了基准电压源，用外接电阻能在0.8V～5.0V的范围内任意地设定输出电压。采用了同步整流电路方式，实现了高效率。虽然基本上采用PWM控制(MODE端子=”High”)的方式，但当轻负载时通过使 MODE端子=”Low”，转换为PFM工作方式(节电)，改善了工作效率。此外,CE=Low时成待机状态，能把消耗电流抑制在2.0μA (MAX.)以下。另外，具有UVLO,过热关断,软启动功能，软启动被设定为大约100μs，能使输出电压高速地上升。The CXSB6603B05G0R-G is a synchronous buck-boost DC/DC converter IC with built-in FETs. The circuit topology switches over between buck and boost smoothly based on the relationship of the input voltage and the output voltage which is observed by the internal PWM controller. Due to the internal FETs, the number of external components is reduced. Also, a 6MHz switching frequency enables smaller external components, such as a coil and capacitors, to be used. The input voltage range is 2.5V~5.5V and the output voltage is adjustable from 0.8V to 5.0V by using external resistors since the reference voltage circuit is embedded internally. Synchronous topology provides high efficiency performance and the control method is selectable from either PWM mode (MODE pin: H) or PFM mode (MODE pin: L). Under PFM mode, the efficiency at light load current will be improved. When a “L” signal level is fed to the CE pin, the product is in stand-by mode and the consumption current is going to be 2.0uA (Max.) or less. Regarding other functions, the product has UVLO, thermal shutdown protection and soft-start. The soft-start time is approx. 100us and the output voltage can rise up quickly.vHM嘉泰姆

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