厂商：Freescale
类别：16位单片机
厂商：
类别：PhotoMOS(MOSFET输出光电耦合器)
厂商：Atmel
类别：EEPROM
厂商：Panasonic
类别：板到板窄间距连接器
厂商：Murata
类别：通信设备用滤波器
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特点1.6V to 5.5V Input Voltage RangeInternal Soft-Start Low Ripple Burst Mode? Operation ? Output Ripple: <20mVP-P ? IQ: 50μA 2.25MHz Constant-Frequency OperationHigh Ef? ciency: Up to 93%250mA Output Current (VIN = 1.8V, VOUT = 1.2V)450mA Peak Inductor CurrentNo Schottky Diode RequiredLow Dropout Operation: 100% Duty Cycle0.611V Reference VoltageStable with Ceramic CapacitorsShutdown Mode Draws <1μA Supply CurrentCurrent Mode Operation for Excellent Line and Load Transient ResponseOvertemperature ProtectionAvailable in a Low Pro? le (0.75mm) 6-Lead (2mm x 3mm) DFN Package典型应用典型应用描述The LTC?3549 is a high efficiency, monolithic synchronous buck regulator using a constant-frequency, current mode architecture. The output voltage is adjusted via an external resistor divider.?A fixed switching frequency of 2.25MHz is supported. This switching frequency allows the use of small surface mount inductors and capacitors, including ceramics.?Supply current during Burst Mode operation is only 50μA dropping to < 1μA in shutdown. The 1.6V to 5.5V input voltage range makes the LTC3549 ideally suited for single cell Li-Ion, Li-Metal and 2-cell alkaline, NiCd or NiMH battery-powered applications. 100% duty cycle capability provides low dropout operation, extending battery life in portable systems. Burst Mode operation can be user-enabled, increasing efficiency at light loads, further extending battery life.?The internal synchronous switch increases efficiency and eliminates the need for an external Schottky diode. Internal soft-start offers controlled output voltage rise time at startup without the need for external components.