高效率同步整流电源管理IC——AX3502(0.6A)/AX3503(1A)/AX3504(2A)
AX3502/3503/3504系列为电流模式(current mode)构造，脉波宽度调变输出的同步直流转换器，内部切换频率高达1.5MHz，不但可以省略一颗外部二极管元件，还可以大幅缩小外部元件，缩小电路板空间及节省元件成本。输入电压范围可由最低2.5伏特到最高5.5伏特，输出电压可以依需要调整最低可以至0.6伏特，而待机电流最大不会超过1毫安，非常适合于手持式产品， PDA，MP3 Player，数码相机，智能型手机...等装置的电压转换。
AX3502/3503/3504应用上可提供高转换效能及稳定的工作电压，工作效率可高达96%， 其内部具有完整的系统保护功能包括短路保护(SCP) 、过温度保护(OTP)及过电流保护(OCP)功能。。
AX3502采用标准的SOT23-5L无铅封装与AX3503 采用标准的SOT23-5L 和SOT89-5L无铅封装，AX3504采用标准的SOP-8L与3×3mm DFN-10L无铅封装体积小而且极少的外部元件可大幅缩小印刷电路板的面积，而且具有高效率， 可大幅减小IC元件表面温度以符合客户需求。
AX3514-1.2MHz,2A Synchronous Step-Down Converter
GENERAL DESCRIPTION
The AX3514/A/B is a 1.2MHz constant frequency current mode PWM step-down
converter. It is ideal for portable equipment requiring very high current up to 2A from single-cell Lithium-ion batteries while still achieving over 90% efficiency during peak load conditions. The AX3514/A/B also can run at 100% duty cycle for low dropout operation, extending battery life in portable systems while light load operation provides very low output ripple for noise sensitive applications. The AX3514/A/B can supply up to 2A output load current from a 2.6V to 5.5V input voltage and the output voltage can be regulated as low as 0.6V. The high switching frequency minimizes the size of external components while keeping switching losses low. The internal slope compensation setting allows the device to operate with smaller inductor values to optimize size and provide efficient operation. The AX3514/A/B is available in adjustable (0.6V to VIN) output voltage. The device is available in SOP8 Pb-free and TDFN-10L packages.
FEATURES
- 2.6V to 5.5V Input Voltage Range
- Output Voltages from 0.6V to VIN
- High Efficiency: Up to 96%
- 1.2MHz Constant Frequency Operation
- Up to 2A Output Current
- No Schottky Diode Required
- Low RDS(ON) Internal Switches: 0.15Ω
- Current Mode Operation for Excellent Line and Load Transient Response
- Current limit, Enable function
- Short Circuit Protect (SCP)
- Build-in Soft Start function
- ≤ 1μA Shutdown Current
- SOP8 Pb-Free and TDFN-10L packages
