原标题：Maxim MAX15040高效4A开关电源稳压解决方案

　　Maxim公司的MAX15040高效开关电源稳压器,输出电流4A,输出电压从0.6V到0.9xVIN.器件工作电压2.4V到3.6V,具有1MHz固定频率PWM模式工作,输出电压精度±1%,主要应用在服务器电源,POL,ASIC/CPU/DSP内地和I/O电源,DDR电源,基站电源以及通信和网络设备电源等.本文介绍了MAX15040主要特性,方框图, VOUT = 1.8V全陶瓷电容设计电路图以及MAX15040评估板主要特性,电路图和材料清单.

　　The MAX15040 high-efficiency switching regulator delivers up to 4A load current at output voltages from 0.6V to (0.9 x VIN). The device operates from 2.4V to 3.6V, making it ideal for on-board point-of-load and postregulation applications. Total output-voltage accuracy is within ±1% over load, line, and temperature.

　　The MAX15040 features 1MHz fixed-frequency PWM mode operation. The high operating frequency allows for small-size external components.

　　The low-resistance on-chip nMOS switches ensure high efficiency at heavy loads while minimizing critical parasitic inductances, making the layout a much simpler task with respect to discrete solutions. Following a simple layout and footprint ensures first-pass success in new designs.

　　The MAX15040 incorporates a high-bandwidth (> 15MHz) voltage-error amplifier. The voltage-mode control architecture and the voltage-error amplifier permit a Type III compensation scheme to achieve maximum loop bandwidth, up to 200kHz. High loop bandwidth provides fast transient response, resulting in less required output capacitance and allowing for allceramic capacitor designs.

　　The MAX15040 features an output overload hiccup protection and peak current limit on both high-side (sourcing current) and low-side (sinking and sourcing current) MOSFETs, for ultra-safe operations in case of high output prebias, short-circuit conditions, severe overloads, or in converters with bulk electrolytic capacitors.

　　The MAX15040 features an adjustable output voltage. The output voltage is adjustable by using two external resistors at the feedback or by applying an external reference voltage to the REFIN/SS input. The MAX15040 offers programmable soft-start time using one capacitor to reduce input inrush current. A built-in thermal shutdown protection assures safe operation under all conditions.

　　The MAX15040 is available in a 2mm x 2mm, 16-bump (4 x 4 array), 0.5mm pitch WLP package.

　　MAX15040主要特性:

　　_ Internal 15mΩ RDS(ON) MOSFETs

　　_ Continuous 4A Output Current

　　_ ±1% Output-Voltage Accuracy Over Load, Line, and Temperature

　　_ Operates from 2.4V to 3.6V Supply

　　_ Adjustable Output from 0.6V to (0.9 x VIN)

　　_ Adjustable Soft-Start Reduces Inrush Supply Current

　　_ Factory-Trimmed 1MHz Switching Frequency

　　_ Compatible with Ceramic, Polymer, and Electrolytic Output Capacitors

　　_ Safe Startup into Prebias Output

　　_ Enable Input/Power-Good Output

　　_ Fully Protected Against Overcurrent and Overtemperature

　　_ Overload Hiccup Protection

　　_ Sink/Source Current in DDR Applications

　　_ 2mm x 2mm, 16-Bump (4 x 4 Array), 0.5mm Pitch WLP Package

　　MAX15040应用:

　　Server Power Supplies

　　Point-of-Load

　　ASIC/CPU/DSP Core and I/O Voltages

　　DDR Power Supplies

　　Base-Station Power Supplies

　　Telecom and Networking Power Supplies

　　RAID Control Power Supplies

　　图1.MAX15040方框图

　　图2.MAX15040 VOUT = 1.8V全陶瓷电容设计电路图

　　MAX15040评估板

　　The MAX15040 evaluation kit (EV kit) provides a proven design to evaluate the MAX15040 high-efficiency, 4A, step-down regulator with integrated switches. The EV kit is preset for 1.8V output at load currents up to 4A from a 2.4V to 3.6V input supply. The MAX15040 features a 1MHz switching frequency, which allows the EV kit to achieve an all-ceramic capacitor design and fast-transient responses. The EV kit achieves up to 95% efficiency.

　　The MAX15040 EV kit PCB comes with a MAX15040EWE+ installed.

　　MAX15040评估板主要特性:

　　Operates from 2.4V to 3.6V Input Supply

　　All-Ceramic Capacitor Design

　　1MHz Switching Frequency

　　Output-Voltage Range: 0.6V to (0.9 x VIN)

　　Lead(Pb)-Free and RoHS Compliant

　　Proven PCB Layout

　　Fully Assembled and Tested

　　图3.MAX15040评估板电路图

　　MAX15040评估板元件清单(BOM):