参数资料
型号: IR3640MPBF
厂商: International Rectifier
文件页数: 31/32页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM VM 20-MLPQ
标准包装: 100
PWM 型: 电压模式
输出数: 1
频率 - 最大: 1.65MHz
占空比: 92%
电源电压: 4.5 V ~ 5.5 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 125°C
封装/外壳: 20-VFQFN 裸露焊盘
包装: 管件
IR3640MPBF
Stencil Design
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The stencil apertures for the lead lands should be approximately 80% of the area of the lead
lands. Reducing the amount of solder deposited will minimize the occurrence of lead shorts.
Since for 0.5mmpitch devices the leads are only 0.25mm wide, the stencil apertures should not
be made narrower; openings in stencils < 0.25mm wide are difficult to maintain repeatable solder
release.
The stencil lead land apertures should therefore be shortened in length by 80% and centered on
the lead land.
The land pad aperture should deposit approximately 50% area of solder on the center pad. If too
much solder is deposited on the center pad the part will float and the lead lands will be open.
The maximum length and width of the land pad stencil aperture should be equal to the solder
resist opening minus an annular 0.2mm pull back to decrease the incidence of shorting the center
land to the lead lands when the part is pushed into the solder paste.
06/15/2009
31
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