54.10.1.1 Buck Converter

Table 54-15. Buck Converter Electrical Characteristics
SymbolParameterConditionsMin.Typ.Max.Units
PEFFPower EfficiencyIOUT = 100µA-66-%
IOUT = 100mA-74-%
Note: To obtain the best power efficiency from the buck regulator components the values from following table (Table 54-16) should be used.
Table 54-16. External Components Requirements in Switching Mode(1)
SymbolParameterConditionsMin.Typ.Max.Units
CIN(2)Input regulator decoupling capacitors on VDDIO, VDDIOB and VDDANA -10-µF
Ceramic dielectric X7R-100-nF
COUT(3)Output regulator decoupling capacitors on VDDCORE3.764.7-µF
Ceramic dielectric X7R-100-nF
ESR COUTExternal Series Resistance of COUT---0.5Ω
LEXTExternal inductance-10-µH
RSERIES_LEXTESR of LEXT---0.36Ω
ISAT_LEXTSaturation current -500--mA
Note:
  1. These values are based on simulation. They are not covered by production test limits or characterization.
  2. It is recommended to use ceramic X7R capacitor with low-series resistance. Refer to Power Supply Connections for a typical circuit connections.
  3. It is recommended to use ceramic or solid tantalum capacitor with low ESR.