1.9MHz,600mA 同步降压转换器, DC-DC转换控制器 降压 PT1202S

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GENERAL DESCRIPTION
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The PT1202S is a high efficiency monolithic current mode synchronous buck regulator with a constant operation frequency. A main switch and a synchronous switch are integrated in PT1202S, the device has high efficiency and no external Schottky diode needed. Supply current is 300uA during operation and drops to ≤ 1 μ A in shutdown. The 2.5V to 5.5V input voltage range makes the PT1202S ideally suited for single Li-Ion battery-powered app lications. 100% duty cycle provides low dropout operation, extending battery life in portable systems. Automa tic skip cycle operation mode at light loads provides very low output ripple for noise sensitive applications. Internal 1.9MHz switching frequency allowing the use of small surface mount inductors and capacitors. Ultra low output voltages are easily available with the 0.6V feedback reference voltage. The PT1202S is offered in a low profile SOT23-5 package. FEATURES z High Efficiency: Up to 96% z Low Quiescent Current: 300 μ A z 600mA Output Current z 2.5V to 5.5V Input Voltage Range z 1.9MHz Constant Frequency Operation z Internal integrated main switch and rectifier, no Schottky Diode Required z Low Dropout Operation: 100% Duty Cycle z 0.6V Reference Allows Low Output Voltages z Shutdown Mode Draws ≤ 1 μ A Supply Current z Current Mode Operation for Excellent Line and Load Transient Response z Over-temperature Protected z Low Profile SOT Package z RoHS compliant APPLICATIONS z Cellular and Smart Phones z Personal Information Appliances z Microprocessors and DSP Core Supplies z Wireless and DSL Modems z Digital Still Cameras z MP3 Players and PDAs z Portable Instruments    
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