LTC3309A

演示电路2745A内置LTC3309A 5V、6A同步降压型超低噪声开关稳压器，作为2MHz 3.3V至1.2V 6A降压稳压器运行。LTC3309A支持0.5V至VIN的可调输出电压，工作频率为1MHz至3MHz。LTC3309A是一款紧凑型、超低辐射、高效率和高速同步单芯片降压型开关稳压器。凭借22 ns的快速最短接通时间，能够以高频率实现高V_IN到低V_OUT的转换。

DC2745A工作模式可选为突发工作模式Burst Mode^®、跳跃或强制连续(FC)模式。将JP1设置为FC/SYNC位置可将LTC3309A同步到1MHz至3MHz的时钟频率。同步到外部时钟时，LTC3309A会在强制连续模式下工作。RT通过0Ω电阻R9连接到VIN，可将工作频率设置为2MHz。通过移除R9并在R4位置设置适当的电阻，可以轻松更改频率以获得所需频率。有关正确的RT值，请参阅LTC3309A数据手册。

LTC3309A数据手册提供了完整的器件、操作说明和应用信息。必须将该数据手册与本演示配合阅读。LTC3309A组装在3mm × 3mm LQFN封装中，该封装具有裸露焊盘以实现低热阻。数据手册的“低EMI PCB布局”部分中提供了用于实现低EMI运行和最大热性能的布局建议。

效率与负载图显示了电路在突发工作模式下以及3.3V输入时的效率和功率损耗。LTC3309A采用12引脚2mm × 2mm LGA封装。

• Xilinx Artix^® UltraScale+^™ devices are the industry’s only cost-optimized FPGAs based on an advanced, production-proven 16nm architecture for best-in-class performance/watt.


• Analog Devices, Inc. supports power delivery solutions for the Artix Ultrascale+ low-cost designs. Monolithic solutions are used to power Xilinx FPGA and/or SoC rails as well as other system rails. These regulators are highly integrated discrete solutions optimized for cost, efficiency and footprint.


• ADI provides supporting documentation including power schematics, layout, LTpowerPlanner^® and applicable LTpowerPlay^® configuration files to enable you to validate the power solution for your application seamlessly.


• For a complete list power designs and use cases, please contact your local FAE.


• Key Power for full management devices are used as follows:


• LTC3307A
• LTC3309A
• ADP125
• LTC3617 (Optional DDR)
• LTC3618
• ADM1186 (Optional Monitoring & Sequencing)

• Xilinx Artix^® UltraScale+^™ devices are the industry’s only cost-optimized FPGAs based on an advanced, production-proven 16nm architecture for best-in-class performance/watt.


• Analog Devices, Inc. supports power delivery solutions for the Artix Ultrascale+ low-cost designs. Monolithic solutions are used to power Xilinx FPGA and/or SoC rails as well as other system rails. These regulators are highly integrated discrete solutions optimized for cost, efficiency and footprint.


• ADI provides supporting documentation including power schematics, layout, LTpowerPlanner^® and applicable LTpowerPlay^® configuration files to enable you to validate the power solution for your application seamlessly.


• For a complete list power designs and use cases, please contact your local FAE.


• Key Power for full management devices are used as follows:


• LTC3307A
• LTC3309A
• ADP125
• LTC3617 (Optional DDR)
• LTC3618
• ADM1186 (Optional Monitoring & Sequencing)