Part Number:TPS73633-EP
Hello,
I am interested in using TPS73633-EP with quite a bit of capacitance on the out (about 500uF). I noticed on the first page of the datasheet it states, "Stable With No Output Capacitor or Any Value or Type of Capacitor", which makes me think this shouldn't be a problem. However, later in the datasheet, it states,
"The TPS736xx does not require an output for stability and has maximum phase margin with capacitor. It is designed to be stable for all types and values of capacitors. In applications where VIN − VOUT < 0.5 V and multiple low ESR capacitors are in parallel, ringing may occur when the product of COUT and total ESR drops below 50 Ω. Total ESR includes all parasitic resistance, including capacitor ESR and board, socket, and solder-joint resistance. In most applications, the sum of capacitor ESR and trace resistance meets this requirement."
This paragraph is confusing. First of all, how can the product of capacitance and resistance have a unit of ohms? Secondly, most ceramic capacitors have an ESR of 1 ohm or less, so wouldn't any capacitance on the output cause ringing (since ESR would be <50 ohms)?
Can a TI employee or someone weigh in and try to explain what that paragraph means?
Thanks!