新型充电泵实现低输入输出噪声

充电泵DC/DC转换器在板面积约束应用场合中使用十分广泛。这种转换器体积小，工作静态电流小，所需的外部元件少。然而，对于大多数的充电泵来说，噪声是一个相当难以克服的问题。LTC3200系列升压充电泵采用新式结构，用以最小化输入和输出的噪声。

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New Charge Pumps Offer Low Input and Output Noise
Design Note 243
Sam Nork

Charge pump (inductorless) DC/DC converters are quite
popular in space-constrained applications where low to
moderate load currents must be supplied. Such convert-
ers are available in small packages, operate with very low VOUT
quiescent current and require minimal external compo- AC COUPLED
50mV/DIV
nents. However, noise generation is one undesirable
characteristic of most charge pumps.
Unwanted noise can create a variety of problems. Noise
generated at the power input can interfere with RF trans- VIN = 3V 5s/DIV DN243