原标题：Maxim MAX17559 60V双输出降压电源解决方案

　　Maxim公司的MAX17559是驱动nMOSFET的60V双输出降压控制器,采用恒频峰值电流模式架构,两个输出可单独配置,并可使输出有180°相位.输入电压4.5V-60V,输出电压0.8V-24V,采用RSENSE 或电感DCR电流检测,主要用在工业电源,分布是DC电源,马达控制和可编逻辑控制器和计算机化数字控制.本文介绍了MAX17559主要优势和特性,框图,几种应用电路以及MAX17559 EV优势和特性,电路图,材料清单和PCB设计图.

　　The MAX17559 is a dual-output, synchronous step-down controller that drives nMOSFETs. The device uses a constant-frequency, peak-current-mode architecture.

　　The two outputs can be configured as independent voltage rails. Input capacitor size is minimized by running the two outputs 180° out-of-phase.

　　The IC supports current sensing using either an external current-sense resistor for accuracy or an inductor DCR for improved system efficiency. Current foldback or latchoff limits MOSFET power dissipation under short-circuit conditions.

　　The IC provides independent adjustable soft-start/stop for each output and can start up monotonically into a prebiased output. The IC can be configured in either PWM or DCM modes of operation, depending on whether constant-frequency operation or light-load efficiency is desired.

　　The IC operates over the -40℃ to +125℃ temperature range and is available in a lead(Pb)-free, 7mm x 7mm, 32-pin TQFP, package.

　　MAX17559主要优势和特性:

　　Wide Range of Operation

　　• Wide 4.5V to 60V Input Voltage Range

　　• Wide 0.8V to 24V Output Voltage Range

　　• RSENSE or Inductor DCR Current-Sensing

　　• Fixed 180° Out-of-Phase Operation

　　• Adjustable 100kHz to 2.2MHz Switching Frequency

　　• Independent Enable and PGOOD

　　• Available in a Lead(Pb)-Free 7mm x 7mm,32-Pin TQFP Package

　　Enhances Power Efficiency

　　• Low-Impedance Gate Drives for High Efficiency

　　• DCM Operation at Light Loads

　　• Auxiliary Bootstrap LDO

　　Operates Reliably in Adverse Industrial Environments

　　• Independent Adjustable Soft-Start/Stop or Tracking

　　• Current Selectable Foldback or Latchoff Limits MOSFET Heat Dissipation During a Short-Circuit Condition

　　• Operates Over the -40℃ to +125℃ Temperature Range

　　• Output Overvoltage and Overtemperature Protections

　　MAX17559应用:

　　Industrial Power Supplies

　　Distributed DC Power Systems

　　Motion Control

　　Programmable Logic Controllers

　　Computerized Numerical Control

　　图1.MAX17559框图

　　图2.MAX17559降压转换器电路:宽输入电压高效5V和3.3V输出,电阻电流检测(R8,R9)

　　图3.MAX17559降压转换器电路:宽输入电压高效5V和3.3V输出,电感DCR电流检测(L1,L2)

　　MAX17559评估板MAX17559 EV

　　The MAX17559 EV kit is a proven design to evaluatethe dual synchronous step-down regulator that providesindependent 3.3V and 5V outputs capable of driving 8Aand 15A loads from the 6V to 60V input-voltage range.

　　Operating the two regulators 180° out-of-phase significantlyreduces the peak input ripple current, allowing the useof smaller, less expensive components, while minimizingparts count. The EV kit features adjustable input undervoltagelockout, soft-start/stop time, and current-limit threshold,as well as selectable PWM/DCM modes, foldback/latchoffcurrent limit, and independent open-drain PGOOD signals.

　　By disabling channel 2, the evaluation kit is capable ofoperating from a lower input supply (4.5V to 60V), providinga single 3.3V output driving up to 15A.

　　评估板MAX17559 EV优势和特性:

　　●● 6V to 60V Input Range

　　●● Output Rails: VOUT1: 3.3V/15A, VOUT2: 5V/8A

　　●● 150kHz Switching Frequency

　　●● Independent Enable Inputs

　　●● Independent Adjustable Soft-Start Time

　　●● Configurable Tracking Operation

　　●● Selectable PWM/DCM Modes of Operation

　　●● Fixed 180° Out-of-Phase Operation

　　●● Selectable Foldback/Latchoff Current Limit

　　●● Programmable Current-Limit Threshold

　　●● Independent PGOOD Outputs

　　●● Overcurrent, Overvoltage, and OvertemperatureProtection

　　●● Proven PCB Layout

　　●● Fully Assembled and Tested

　　评估板MAX17559 EV材料清单: