SLVS843B December 2008 – May 2018 TPS650250
PRODUCTION DATA.
An RC filter connected at the Vcc input is used to keep noise from the internal supply for the bandgap and other analog circuitry. A typical value of 1 Ω and 1 μF is used to filter the switching spikes, generated by the DC-DC converters. A larger resistor than 10 Ω should not be used because the current into Vcc of up to 2.5 mA causes a voltage drop at the resistor causing the undervoltage lockout circuitry connected at Vcc internally to switch off too early.