厂商：Freescale
类别：16位单片机
厂商：Littelfuse
类别：TVS二极管
厂商：Nichicon
类别：钽电容
厂商：Panasonic
类别：PhotoMOS(MOSFET输出光电耦合器)
厂商：Atmel
类别：ATtiny系列单片机
厂商：Linear
类别：RS485/RS422 收发器
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特点High Efficiency: Up to 95%Constant Frequency 350kHz Operation 2.65V to 8.5V V IN Range V OUT from 0.8V to V IN , I OUT to 500mA No Schottky Diode RequiredSynchronizable Up to 525kHzSelectable Burst Mode? OperationLow Dropout Operation: 100% Duty CyclePrecision 2.5V Undervoltage LockoutSecondary Winding RegulationCurrent Mode Operation for Excellent Line and Load Transient ResponseLow Quiescent Current: 200μAShutdown Mode Draws Only 15μA Supply Current±1.5% Reference AccuracyAvailable in 8-Lead SO Package典型应用典型应用描述描述 The LTC?1627 is a monolithic current mode synchronous buck regulator using a fixed frequency architecture. The operating supply range is from 8.5V down to 2.65V, making it suitable for one or two lithium-ion battery-powered applications. Burst Mode operation provides high efficiency at low load currents. 100% duty cycle provides low dropout operation, which extends operating time in battery-operated systems. The operating frequency is internally set at 350kHz, allowing the use of small surface mount inductors. For switching noise sensitive applications it can be externally synchronized up to 525kHz. The SYNC/FCB control pin guarantees regulation of secondary windings regardless of load on the main output by forcing continuous operation. Burst Mode operation is inhibited during synchronization or when the SYNC/FCB pin is pulled low to reduce noise and RF interference. Soft-start is provided by an external capacitor. Optional bootstrapping enhances the internal switch drive for single lithium-ion cell applications. The internal synchronous switch increases efficiency and eliminates the need for an external Schottky diode, saving components and board space. The LTC1627 comes in an 8-lead SO package.