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OUTPUT CAPACITOR

100

47

10

0.01

1000

0.1

ESR − Equivalent Series Resistance −

Ω

Region of Stability

Region of Instability

0.2

TPS75901, TPS75915

TPS75918, TPS75925, TPS75933

SLVS318E – DECEMBER 2000 – REVISED MARCH 2004

APPLICATION INFORMATION (continued)

As with most LDO regulators, the TPS759xx requires an output capacitor connected between OUT and GND to

stabilize the internal control loop. The minimum recommended capacitance value is 47 µF with an ESR

(equivalent series resistance) of at least 200 m

Ω. As shown in Figure 29, most capacitor and ESR combinations

with a product of 47e-6 x 0.2 = 9.4e-6 or larger will be stable, provided the capacitor value is at least 47 µF. Solid

tantalum electrolytic and aluminum electrolytic capacitors are all suitable, provided they meet the requirements

described in this section. Larger capacitors provide a wider range of stability and better load transient response.

This information along with the ESR graphs, Figure 19, Figure 20, and Figure 29, is included to assist in

selection of suitable capacitance for the user's application. When necessary to achieve low height requirements

along with high output current and/or high load capacitance, several higher ESR capacitors can be used in

parallel to meet these guidelines.

Figure 29. Output Capacitance vs Equivalent Series Resistance

21