ADP5033ACBZ-1-R7 datasheet(21/28 Pages) AD

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ADP5033

Rev. 0 | Page 21 of 28

The peak-to-peak output voltage ripple for the selected output

capacitor and inductor values is calculated using the following

equation:

()

OUT

RIPPLE

2π

OUT

RIPPLE

Capacitors with lower equivalent series resistance (ESR) are

preferred to guarantee low output voltage ripple, as shown in

the following equation:

RIPPLE

COUT

ESR

≤

The effective capacitance needed for stability, which includes

temperature and dc bias effects, is a minimum of 7 μF and a

maximum of 40 μF.

The buck regulators require 10 μF output capacitors to guaran-

tee stability and response to rapid load variations and to

transition into and out of the PWM/PSM modes. In certain

applications, where one or both buck regulators power a

processor, the operating state is known because it is controlled

by software. In this condition, the processor can drive the

MODE pin according to the operating state; consequently, it is

possible to reduce the output capacitor from 10 μF to 4.7 μF

because the regulator does not expect a large load variation

when working in PSM mode (see Figure 47).

Table 9. Suggested 10 μF Capacitors

Vendor

Type

Model

Case Size

Voltage Rating (V)

Murata

X5R

GRM188R60J106

0603

6.3

Taiyo Yuden

X5R

JMK107BJ475

0603

6.3

TDK

X5R

C1608JB0J106K

0603

6.3

Panasonic

X5R

ECJ1VB0J106M

0603

6.3

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