ZHCSJI6 March 2019 TPS65653-Q1
PRODUCT PREVIEW Information. Product in design phase of development. Subject to change or discontinuance without notice.
The input capacitors CIN_BUCK0 and CIN_BUCK1 are shown in the Typical Application. A ceramic input bypass capacitor of 10 μF is required for each phase of the regulator. Place the input capacitor as close as possible to the VIN_Bx pin and PGND_Bx pin of the device. A larger value or higher voltage rating improves the input voltage filtering. Use X7R type of capacitors, not Y5V or F. Also the DC bias characteristics capacitors must be considered. Minimum effective input capacitance to ensure good performance is 1.9 μF per buck input at maximum input voltage including tolerances, ambient temperature range and aging. This is assuming that there are at least 22 μF of additional capacitance common for all the power input pins on the system power rail. See Table 9.
The input filter capacitor supplies current to the high-side FET switch in the first half of each cycle and reduces voltage ripple imposed on the input power source. A ceramic capacitor's low ESR provides the best noise filtering of the input voltage spikes due to this rapidly changing current. Select an input filter capacitor with sufficient ripple current rating. In addition ferrite can be used in front of the input capacitor to reduce the EMI.
MANUFACTURER | PART NUMBER | VALUE | CASE SIZE | DIMENSIONS L × W × H (mm) | VOLTAGE RATING |
---|---|---|---|---|---|
Murata | GCM21BR71A106KE22 | 10 µF (10%) | 0805 | 2 × 1.25 × 1.25 | 10 V |