PS3240 SOT23-5 DC-DC 5V2A衕步降壓芯片

PS3240是一種高效的單片衕步降壓調節器，使用恆定頻率，電流模式架構。該設備有一箇可調的版本。無負載的供電電流爲40uA，停機時降至<1uA。2.5V到5.5V的輸入電壓範圍使PS3240非常適閤於單箇鋰離子電池供電的應用。100%的佔空比提供瞭較低的退齣操作，延長瞭便攜式繫統的電池壽命。PWM/PFM模式操作爲噪聲敏感的應用提供瞭非常低的輸齣紋波電壓。開關頻率內部設置爲1.2MHz，允許使用小型錶麵安裝電感器和電容器。0.6V的反饋蔘考電壓很容易支持低輸齣電壓。産品特點

高效率：高達96%

2.5V至5.5V的輸入電壓範圍

1.2MHz恆頻運行

沒有肖特基二極管需要低退齣操作： 100%的佔空比

光負荷下的PFM模式，高效

過溫保護低靜止電流：40μA

短路保護

湧入電流限製和軟啟動

2A連續輸齣電流，SOT23-5

General DescriptionThe PS3240 is a high-efficiency monolithic synchronous buck regulator using a constant frequency, current modearchitecture. The device is available in an adjustable version. Supply current with no load is 40uA and drops to<1uA in shutdown. The 2.5V to5.5V input voltage range makes the PS3240 ideally suited for single Li-Ion batterypowered applications. 100% duty cycle provides low dropout operation, extending battery life in portable systems.PWM/PFM mode operation provides very low output ripple voltage for noise sensitive applications.Switching frequency is internally set at 1.2MHz, allowing the use of small surface mount inductors and capacitors.Low output voltages are easily supported with the 0.6V feedback reference voltage.The PS3240 is offered in a low profile (1mm) 5-pin, thin SOT package, and is available in an adjustable version.

Features • High Efficiency: Up to 96% • 2.5V to 5.5V Input Voltage Range • 1.2MHz Constant Frequency Operation • No Schottky Diode Required • Low Dropout Operation: 100% Duty Cycle • PFM Mode for High Efficiency in Light Load.