厂商：Freescale
类别：16位单片机
厂商：Linear
类别：精准放大器
类别：DC/DC控制器
厂商：TDK
类别：抗氧体磁珠和芯片
厂商：
类别：PhotoMOS(MOSFET输出光电耦合器)
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特点High Efficiency: Up to 94%250mA Output Current Wide V IN Range: 2.5V to 9.8V 550kHz Constant Frequency OperationBurst Mode? Operation at Light LoadLow Dropout: 100% Duty Cycle0.8V Reference Allows Low Output Voltages±2.5% Reference AccuracyCurrent Mode Operation for Excellent Line and Load Transient ResponseLow Quiescent Current: 135μAShutdown Mode Draws Only 8μA Supply CurrentLow Profile (1mm) ThinSOT? Package典型应用典型应用描述The LTC?1779 is a constant frequency current mode step-down DC/DC converter in a 6-lead ThinSOT package. The part operates with a 2.5V to 9.8V input and can provide up to 250mA of output current. Current mode control provides excellent AC and DC load and line regulation. The device incorporates an accurate undervoltage lockout feature that shuts down the LTC1779 when the input voltage falls below 2V.The LTC1779 boasts a ±2.5% output voltage accuracy and consumes only 135μA of quiescent current. For applications where efficiency is a prime consideration, the LTC1779 is configured for Burst Mode operation, which enhances efficiency at low output current.To further maximize the life of a battery source, the internal P-channel MOSFET is turned on continuously in dropout (100% duty cycle). In shutdown, the device draws a mere 8μA. High constant operating frequency of 550kHz allows the use of a small external inductor.The LTC1779 is available in a low profile (1mm) ThinSOT package.