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TPS62590

www.ti.com

SLVS897C – JANUARY 2009 – REVISED DECEMBER 2015

(6)

At light load currents the converter operates in power save mode and the output voltage ripple is dependent on

the output capacitor and inductor value. Larger output capacitor and inductor values minimize the voltage ripple

in PFM mode and tighten DC output accuracy in PFM mode.

8.2.2.2.3

Input Capacitor Selection

The buck converter has a natural pulsating input current; therefore, a low ESR input capacitor is required for best

input voltage filtering and minimizing the interference with other circuits caused by high input voltage spikes. For

most applications, a 10-

μF ceramic capacitor is recommended. The input capacitor can be increased without any

limit for better input voltage filtering.

Take care when using only small ceramic input capacitors. When a ceramic capacitor is used at the input and the

the input can induce ringing at the VIN pin. The ringing can couple to the output and be mistaken as loop

instability or could even damage the part by exceeding the maximum ratings.

Table 2. List of Capacitor

CAPACITANCE

TYPE

SIZE

SUPPLIER

10

μF

GRM188R60J106M69D

Murata

Table 3 shows the list of components for the Application Curves.

Table 3. List of Components

COMPONENT REFERENCE

PART NUMBER

MANUFACTURER

VALUE

GRM188R60J106M

Murata

10

μF, 6.3-V. X5R Ceramic

GRM188R60J106M

Murata

10

μF, 6.3-V. X5R Ceramic

Murata

22-pF, COG Ceramic

LPS3015

Coilcraft

2.2

μH, 110 mΩ

Values depending on the programmed output voltage

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