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1.5MHz, 800mA 同步降压变换器AP2408,Synchronous buck converter AP2408
关键字：1.5MHz, 800mA 同步降压变换器AP2408
1.5MHz, 800mA Synchronous Step-Down Converter
Description
本电路可替代AT1366
The AP2408 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, such as 1.2V, 1.8V, etc. Supply current with no load is 300uA and drops to <1uA in shutdown. The 2.5V to 6.5V input voltage range makes the AP2408 ideally suited for single Li-Ion, two to four AA battery-powered applications. 100% duty cycle provides low dropout operation, extending battery life in portable systems. PWM pulse skipping mode operation provides very low output ripple voltage for noise sensitive applications. 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 AP2408 is available in a small SOT package.
Applications
lCellular and Smart Phones
lMicroprocessors and DSP Core Supplies
lWireless and DSL Modems
lPDAs
lMP3 / MP4 /MPM Player
lDigital Still and Video Cameras
lPortable Instruments
Features
lHigh Efficiency: Up to 96%
l1.5MHz Constant Switching Frequency
l800mA Output Current at VIN=3.6V
lIntegrated Main switch and synchronous rectifier. No Schottky Diode Required
l2.5V to 6.5V Input Voltage Range
lOutput Voltage as Low as 0.6V
l100% Duty Cycle in Dropout
lQuiescent Current: 300μA(input < 4.2V)
lSlope Compensated Current Mode Control for Excellent Line and Load Transient Response
lShort Circuit Protection
lThermal Fault Protection
l<1uA Shutdown Current
Package
lSpace Saving 5-Pin SOT23 package
Typical Application Circuit
效率曲线：
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