原标题：Intersil ISL85033双路3A(单路6A)降压电源解决方案

　　Intersil 公司的ISL85033是双路3A/单路6A的降压电源稳压器，输入电压从4.5V到28V，采用峰值电流模式控制，开关频率从300kHz到2MHz，保护特性包括过流，UVLO和热过载保护，主要用在通用POL DC/DC转换，STB，FPGA电源，DVD和HDD驱动器，LCD屏，TV电源和线缆调制解调器。本文介绍了ISL85033主要特性，功能方框图，双路3A输出电路图和单路6A输出电路图，ISL8033EVAL2Z评估板主要特性，电路图，材料清单和PCB元件布局图。

　　The ISL85033 is a dual standard buck regulator capable of 3A per channel continuous output current. With an input range of 4.5V to 28V, it provides a high frequency power solution for a variety of point of load applications.

　　The PWM controller in the ISL85033 drives an internal switching N-Channel power MOSFET and requires an external Schottky diode to generate the output voltage. The integrated power switch is optimized for excellent thermal performance up to 3A of output current. The PWM regulator switches at a default frequency of 500kHz and it can be user programmed or synchronized from 300kHz to 2MHz. The ISL85033 utilizes peak current mode control to provide flexibility in component selection and minimize solution size. The protection features include overcurrent, UVLO and thermal overload protection.

　　The ISL85033 is available in a small 4mmx4mm Thin Quad Flat Pb-free (TQFN) package.

　　ISL85033主要特性：

　　• Wide Input Voltage Range from 4.5V to 28V

　　• Adjustable Output Voltage with Continuous Output Current up to 3A

　　• Current Mode Control

　　• Adjustable Switching Frequency from 300kHz to 2MHz

　　• Independent Power-Good Detection

　　• Selectable In-Phase or Out-of-Phase PWM Operation

　　• Independent, Sequential, Ratiometric or Absolute Tracking Between Outputs

　　• Internal 2ms Soft-start Time

　　• Overcurrent/Short Circuit Protection, Thermal Overload Protection, UVLO

　　• Boot Undervoltage Detection

　　• Pb-Free (RoHS Compliant)

　　ISL85033应用：

　　• General Purpose Point of Load DC/DC Power Conversion

　　• Set-top Boxes

　　• FPGA Power and STB Power

　　• DVD and HDD Drives

　　• LCD Panels, TV Power

　　• Cable Modems

　　图1。ISL85033功能方框图

　　图2。ISL85033双路3A输出电路图(VIN电压从4.5V到28V)

　　图3。ISL85033单路6A输出电路图(VIN电压从4.5V到28V)

　　ISL8033EVAL2Z评估板

　　ISL8033EVAL2Z Dual 3A Low Quiescent Current, High Efficiency, Synchronous Buck Regulator

　　The ISL8033EVAL2Z kit is intended for use by individuals with requirements for Point-of-Load applications sourcing from 2.85V to 6V. The ISL8033EVAL2Z evaluation board is used to demonstrate the performance of the ISL8033 low quiescent current mode converter.

　　The ISL8033 is offered in a 4mmx4mm 24 Ld QFN package with 1mm maximum height. The complete converter occupies less than 0.229in2.

　　ISL8033EVAL2Z评估板主要特性：

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

　　• Power-Goods (PG) Output with 1.5ms Delay

　　• 2.85V to 6V Supply Voltage

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

　　• Start-up with Pre-biased Output

　　• 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

　　• Adjustable Peak Overload Current

　　图4。ISL8033EVAL2Z评估板电路图

　　ISL8033EVAL2Z评估板材料清单(BOM)：