LTC1840是一款双路风扇速度控制器，可应用于服务器和其他基于RACK的网络和电信设备。可提供高级控制和监控能力，通过I2C和SMBUS兼容的2线串行接口进行控制。 advertisement 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……