原标题：Intersil ISL8036双路3A电源控制解决方案

　　Intersil公司的ISL8036/ISL8036A是双路3A电流输出的降压电源控制器, 工作频率为1MHz (ISL8036)/2.5MHz (ISL8036A),电源电压2.8V-6V,效率高达95%,输出精度2%,电流共享模式可达6A电流,外部同步高达6MHz,内部具有数字软起动 1.5ms,主要用在DC/DC POL模块,uC/uP,FPGA和DSP电源,路由器和交换机的插入DC/DC模块,测试和测量系统,锂离子电池供电的设备以及条形码阅读器等.本文介绍了ISL8036/ISL8036A主要特性,方框图,单路输出6A和双路3A输出的典型应用电路和相应的元器件, ISL8036ADUALEVAL1Z评估板主要特性, 电路图,材料清单和元件布局图.

　　ISL8036/ISL8036A are integrated power controllers rated for dual 3A output current or current sharing operation with a 1MHz (ISL8036)/2.5MHz (ISL8036A) step-down regulator, which is ideal for any low power low-voltage applications. The channels are 180° out-of-phase for input RMS current and EMI reduction. It is optimized for generating low output voltages down to 0.8V each. The supply voltage range is from 2.8V to 6V, allowing for the use of a single Li+ cell, three NiMH cells or a regulated 5V input. The two channels are 180 degrees out of phase, and each one has a guaranteed minimum output current of 3A. They can be combined to form a single 6A output in the current sharing mode. While in current sharing, the interleaved PWM signals reduce input and output ripple.

　　The ISL8036, ISL8036A includes a pair of low ON-resistance P-channel and N-channel internal MOSFETs to maximize efficiency and minimize external component count. 100% duty-cycle operation allows less than 250mV dropout voltage at 3A each.

　　The ISL8036, ISL8036A offers an independent 1ms Power-good (PG) timer at power-up. When shutdown, ISL8036, ISL8036A discharges the output capacitor.Other features include internal digital soft-start, enable for power sequence, overcurrent protection, and thermal shutdown.

　　The ISL8036, ISL8036A is offered in a 24 Ld 4mmx4mm QFN package with 1mm maximum height. The complete converter occupies less than 1.5cm2 area.

　　ISL8036/ISL8036A主要特性:

　　• 3A High Efficiency Synchronous Buck Regulator with up to 95% Efficiency

　　• 2% Output Accuracy Over-Temperature/Load/Line

　　• Internal Digital Soft-Start - 1.5ms

　　• 6A Current Sharing Mode Operation

　　• External Synchronization up to 6MHz

　　• Internal Current Mode Compensation

　　• Peak Current Limiting and Hiccup Mode Short Circuit Protection

　　• Reverse Overcurrent Protection

　　ISL8036/ISL8036A应用:

　　• DC/DC POL Modules

　　• μC/μP, FPGA and DSP Power

　　• Plug-in DC/DC Modules for Routers and Switchers

　　• Test and Measurement Systems

　　• Li-ion Battery Power Devices

　　• Bar Code Reader

　　图1.ISL8036/ISL8036A方框图

　　图2.ISL8036/ISL8036A典型应用电路-单路输出6A

　　图3.ISL8036/ISL8036A典型应用电路-双路3A输出

　　表1.双路输出元件数值:

　　表2.电流共享的元件数值:

　　COMPONENT VALUE SELECTION FOR CURRENT SHARING OPERATION

　　ISL8036ADUALEVAL1Z评估板

　　The ISL8036ADUALEVAL1Z kit is intended for use by individuals with requirements for Point-of-Load applications sourcing from 2.85V to 6V. The ISL8036ADUALEVAL1Z evaluation board is used to demonstrate the performance of the ISL8036A low quiescent current mode converter.

　　The ISL8036A is offered in a 4mmx4mm 24 Ld QFN package with 1mm maximum height. The complete converter occupies less than 5.46cm2 area.

　　ISL8036ADUALEVAL1Z评估板主要特性:

　　• Dual 3A High Efficiency Synchronous Buck Regulator with up to 95% Efficiency

　　• 180° Out-of-Phase

　　• Power-Goods (PG) Output with 1ms Delay

　　• 2.85V to 6V Supply Voltage

　　• 2% Output Accuracy Over-temperature/Load/Line

　　• Start-up with Pre-biased Output

　　• Internal Digital Soft-Start - 1.5ms

　　• Soft-Stop Output Discharge During Disabled

　　• External Synchronization up to 6MHz

　　• Typical 8μA Logic Controlled Shutdown Current

　　• 100% Maximum Duty Cycle for Lowest Dropout

　　• Internal Current Mode Compensation

　　• Peak Current Limiting, Hiccup Mode Short Circuit Protection and Over-temperature Protection

　　• Negative Current Detection and Protection

　　图4.ISL8036ADUALEVAL1Z评估板电路图

　　ISL8036ADUALEVAL1Z评估板材料清单(BOM):