Data Sheet

ADP5300

Rev. 0 | Page 17 of 21

APPLICATIONS INFORMATION

This section describes the external components selection for the

ADP5300. The typical application circuit is shown in Figure 41.

2.2µH

SW

PGND

FB

10µF

MLCC

10µF

MLCC

PVIN

EN

VID

ADP5300

VOUTOK

EPAD

SYNC/MODE

STOP

AGND

R2

1MΩ

R1

19.6kΩ

Figure 41. Typical Application Circuit

EXTERNAL COMPONENT SELECTION

The ADP5300 is optimized for operation with a 2.2 μH

inductor and 10 μF output capacitors for various output

voltages using the closed-loop compensation and adaptive slope

compensation circuits. The selection of components depends

on the efficiency, the load current transient, and other application

requirements. The trade-offs among performance parameters,

such as efficiency and transient response, are made by varying

the choice of external components.

SELECTING THE INDUCTOR

The high switching frequency of the ADP5300 allows the use of

small surface-mount power inductors. The dc resistance (DCR)

value of the selected inductor affects efficiency. In addition, it is

recommended to select a multilayer inductor rather than a

magnetic iron inductor because the high switching frequency

increases the core temperature rise and enlarges the core loss.

A minimum requirement of the dc current rating of the inductor

is for it to be equal to the maximum load current plus half of the































SW

IN

OUT

OUT

L

f

L

V

V

V

ΔI

–

1

















2

L

LOAD(MAX)

PK

ΔI

I

I

Use the inductor series from the different vendors shown in Table 6.

OUTPUT CAPACITOR

Output capacitance is required to minimize the voltage overshoot,

the voltage undershoot, and the ripple voltage present on the

output. Capacitors with low equivalent series resistance (ESR)

values produce the lowest output ripple. Furthermore, use

capacitors such as X5R and X7R dielectric capacitors. Do not

use Y5V and Z5U capacitors, because they are unsuitable

choices due to their large capacitance variation over temperature

and their dc bias voltage changes. Because ESR is important,

select the capacitor using the following equation:

L

RIPPLE

COUT

I

V

ESR





where:

is the ESR of the chosen capacitor.

is the peak-to-peak output voltage ripple.

Increasing the output capacitor value has no effect on stability

and may reduce output ripple and enhance load transient response.

When choosing the output capacitor value, it is important to

account for the loss of capacitance due to output voltage dc bias.

Use the capacitor series from the different vendors shown in Table 7.

Table 6. Recommended Inductors

Vendor

Model

Inductance (μH)

Dimensions (mm)

DCR (mΩ)

TDK

MLP2016V2R2MT0S1

2.2

2.0 × 1.6 × 0.85

280

1.0

Wurth

74479889222

2.2

2.5 × 2.0 × 1.2

250

1.7

Coilcraft

LPS3314-222MR

2.2

3.3 × 3.3 × 1.3

100

1.5

Table 7. Input and Output Capacitors

Vendor

Model

Capacitance (μF)

Size

Murata

GRM188D71A106MA73

10

0603

Murata

GRM21BR71A106KE51

10

0805

Murata

GRM31CR71A106KA01

10

1206