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1.5MHz 2A Synchronous Step-Down Regulator Dropout TD6817 The TD6817 is a high efficiency monolithic synchronous buck regulator using a constant frequency, current mode architecture. The device is available in an adjustable version and fixed output voltages of 1.5V and 1.8V. Supply current during operation is only 20mA and drops to ?1mA in shutdown. The 2.5V to 5.5V input voltage range makes the TD6817 ideally suited for single Li-Ion battery-powered applications. 100% duty cycle provides low dropout operation, extending battery life in portable systems.Automatic Burst Mode operation increases efficiency at light loads, further extending battery life. Switching frequency is internally set at 1.5MHz, allowing the use of small surface mount inductors and capacitors. The internal synchronous switch increases efficiency and eliminates the need for an external Schottky diode. Low output voltages are easily supported with the 0.6V feedback reference voltage. The TD6817 is available in TSOT23-5 package. High Efficiency: Up to 96% High Efficiency at light loads Very Low Quiescent Current: Only 20uA During Operation 2A Output Current 2.5V to 5.5V Input Voltage Range 1.5MHz Constant Frequency Operation No Schottky Diode Required Low Dropout Operation: 100% Duty Cycle 0.6V Reference Allows Low Output Voltages Shutdown Mode Draws ?1uA Supply Current Current Mode Operation for Excellent Line and Load Transient Response Overtemperature Protected TSOT23-5 Package is Available

2SC945 CR 50V 150mA 200mW SOT23-3 SMD Transistor Description: Type Designator: GP Silicon Transistor SMD Transistor Code: K3P Type of Transistor: General Purpose Switching Polarity: NPN Maximum Power Dissipation (Pd): 200mW Collector-Base Voltage |Vdc|: 60V Collector-Emitter Voltage |Vdc|: 50V Collector Current |Ic|: 150mA Emitter-Base |Vdc|: 5V Transision Frequency: 150MHz Package Content: 1pc 2SC945 CR SMD SOT23-3 Transistor