36 V Output, Sot23, Low-Noise Power Supplies For Varactor Diode Biasing
The MAX5026/MAX5028 are designed to operate in discontinuous mode, which reduces switching noise and voltage spikes. In addition, the slew rate at the switch/inductor pin is controlled to further reduce noise. Both devices operate at constant PWM frequency, which provides easy filtering for low-noise applications, allowing high-frequency switching ripple of less than 1 mV peak-to-peak at the output of the power supply. Both devices operate at 500kHz switching frequency, which allows the use of a tiny surface-mount 47 microfarads inductor and a 1 microfarads ceramic output capacitor, resulting in a compact power supply.
Both the MAX5026 and MAX5028 are available in a 6-pin SOT23 package and are rated for operation over the extended-industrial temperature range (-40 degrees Celsius to +85 degrees Celsius).