SLUSBW3D March 2014 – December 2017 UCC28630 , UCC28631 , UCC28632 , UCC28633 , UCC28634
PRODUCTION DATA.
The VDD power pin for the device requires the placement of low-esr noise-decoupling capacitance as directly as possible from the VDD pin to the GND pin. Ceramic capacitors with stable dielectric characteristics over temperature are recommended, such as X7R or better. Depending on the operating temperature range of the application, X5R may be acceptable, but the drop in capacitance value at high temperature and with applied DC-bias may not be tolerable. Avoid dielectrics with poor temperature-stability. (such Y5V, Z5U)
The recommended decoupling capacitors are a 1-μF 1206-sized 50-V X7R capacitor, ideally with (but not essential) a second smaller parallel 100-nF 0603-sized 50-V X7R capacitor. Higher voltage rating parts can also be used. The use of 25-V rated parts is not recommended, due to the reduction in effective capacitance value with applied DC bias.
In parallel with the ceramic noise-decoupling capacitor(s), a larger-capacitance energy storage capacitor is also required, per Equation 58. This energy-storage capacitor does not require low esr, and does not necessarily need to be located close to the device.