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1.5Mhz400毫安同步降压变换器,Synchronous buck converter
关键字：1.5Mhz400毫安同步降压变换器
1.5Mhz, 400mA Synchronous Step-Down Converter
Description
本芯片可替代LTC3405
The AP2404L 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, 1.5V, 1.8V, etc. Supply current with no load is 40uA and drops to <1uA in shutdown. The 2.5V to 6.5V input voltage range makes the AP2404L 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. 40uA quiescent current is very suitable for DSP/MCU in standby operation. 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 AP2404L is available in a small SOT package.
Applications
●Cellular and Smart Phones
●Microprocessors and DSP Core Supplies
●Wireless and DSL Modems
●PDAs
●MP3 / MP4 /MPM Player
●Digital Still and Video Cameras
●Portable Instruments
Features
●High Efficiency: Up to 96%
●1.5MHz Constant Switching Frequency
●400mA Output Current at VIN=3V
●Integrated Main switch and synchronous rectifier. No Schottky Diode Required
●2.5V to 6.5V Input Voltage Range
●Output Voltage as Low as 0.6V
●100% Duty Cycle in Dropout
●Excellent low Quiescent Current: 40µA
●Slope Compensated Current Mode Control for Excellent Line and Load Transient Response
●Short Circuit Protection
●<1uA Shutdown Current
●Space Saving 5-Pin SOT23 package
Typical Application Circuit
效率曲线：
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