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AN1782 PDF预览

AN1782

更新时间: 2022-11-29 07:20:45
品牌 Logo 应用领域
美信 - MAXIM 稳压器
页数 文件大小 规格书
5页 46K
描述
Small Footprint, 10us Response Time, 10mV Output Ripple, 1MHz, 6A Step-Down Regulator

AN1782 数据手册

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POWER-SUPPLY CIRCUITS  
Nov 11, 2002  
Small Footprint, 10us Response Time, 10mV  
Output Ripple, 1MHz, 6A Step-Down Regulator  
One benefit of high-frequency switching is the fast loop response. This translates to smaller  
footprint and lower cost, because the ceramic capacitors can be used. The MAX1945 internal  
switch step-down regulator is designed for high-frequency switching. It can be switched at  
1MHz. Its peak current mode control architecture allows simple Type II compensation (R2 and  
C2) to achieve high bandwidth, further reducing the external component count.  
As shown in Figure 1, for 6A output, only two 1210 footprint ceramic capacitors are needed to  
meet the 50% step load change, thus greatly reducing the output capacitor size when compared  
to switching at 500kHz or less. A second benefit is due to the low ESR of the ceramic  
capacitors. Large inductor ripple current is allowed to achieve the 1% ripple voltage  
requirement.The value of the output inductor is 0.68uH, resulting in a footprint of 8.2mm x  
8.2mm for 6A output current, further reducing buck converter size.  

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