PS3240 SOT23-5 DC-DC 5V2A同步降壓芯片

PS3240是一種高效的單片同步降壓調(diào)節(jié)器，使用恒定頻率，電流模式架構(gòu)。該設(shè)備有一個可調(diào)的版本。無負(fù)載的供電電流為40uA，停機(jī)時降至<1uA。2.5V到5.5V的輸入電壓范圍使PS3240非常適合于單個鋰離子電池供電的應(yīng)用。100%的占空比提供了較低的退出操作，延長了便攜式系統(tǒng)的電池壽命。PWM/PFM模式操作為噪聲敏感的應(yīng)用提供了非常低的輸出紋波電壓。開關(guān)頻率內(nèi)部設(shè)置為1.2MHz，允許使用小型表面安裝電感器和電容器。0.6V的反饋參考電壓很容易支持低輸出電壓。產(chǎn)品特點(diǎn)

高效率：高達(dá)96%

2.5V至5.5V的輸入電壓范圍

1.2MHz恒頻運(yùn)行

沒有肖特基二極管需要低退出操作： 100%的占空比

光負(fù)荷下的PFM模式，高效

過溫保護(hù)低靜止電流：40μA

短路保護(hù)

涌入電流限制和軟啟動

2A連續(xù)輸出電流，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.