ZHCSI17B December 2008 – May 2018 TPS650250
PRODUCTION DATA.
Because of the nature of the buck converter having a pulsating input current, a low ESR input capacitor is required for best input voltage filtering and minimizing interference with other circuits caused by high input voltage spikes. Each DC-DC converter requires a 10 µF ceramic input capacitor on its input pin VINDCDCx. The input capacitor can be increased without any limit for better input voltage filtering. The Vcc pin should be separated from the input for the DC-DC converters. A filter resistor of up to 10 Ω and a 1 μF capacitor should be used for decoupling the Vcc pin from switching noise. Note that the filter resistor may affect the UVLO threshold since up to 3 mA can flow via this resistor into the Vcc pin when all converters are running in PWM mode.
| CAPACITOR VALUE | CASE SIZE | COMPONENT SUPPLIER | COMMENTS | |
|---|---|---|---|---|
| 22 μF | 1206 | TDK | C3216X5R0J226M | Ceramic |
| 22 μF | 1206 | Taiyo Yuden | JMK316BJ226ML | Ceramic |
| 22 μF | 0805 | TDK | C2012X5R0J226MT | Ceramic |
| 22 μF | 0805 | Taiyo Yuden | JMK212BJ226MG | Ceramic |
| 10 μF | 0805 | Taiyo Yuden | JMK212BJ106M | Ceramic |
| 10 μF | 0805 | TDK | C2012X5R0J106M | Ceramic |