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INPUT AND OUTPUT CAPACITOR The TPS709xx are stable with output capacitors with an effective capacitance of 2.0 μF or greater for output voltages below 1.5 V. For output voltages equal or greater than 1.5 V, the minimum effective capacitance for stability is 1.5 μF. The maximum capacitance for stability is 47 μF. The equivalent series resistance (ESR) of the output capacitor should be between 0 Ω and 0.2 Ω for stability. The effective capacitance is the minimum capacitance value of a capacitor after taking into account variations resulting from tolerances, temperature, and dc bias effects. X5R- and X7R-type ceramic capacitors are recommended because these capacitors have minimal variation in value and ESR over temperature. Although an input capacitor is not required for stability, it is good analog design practice to connect a 0.1-μF to 2.2-μF capacitor from IN to GND. This capacitor counteracts reactive input sources and improves transient response, input ripple, and PSRR. An input capacitor is necessary if line transients greater than 10 V in magnitude are anticipated.
