SW

IN

OUT

OUT

L

L

MAX

,

OUT

MAX

,

L

f

L

V

V

1

V

I

2

I

I

I

´

-

´

=

D

D

+

=

TLV62565, TLV62566

SLVSBC1C – OCTOBER 2013 – REVISED JULY 2015

www.ti.com

11.2.1.2 Inductor Selection

The main parameters for inductor selection is inductor value and then saturation current of the inductor. To

calculate the maximum inductor current under static load conditions, Equation 2 is given:

where:

•

•

•

•

L is the inductor value

(2)

It is recommended to choose a saturation current for the inductor that is approximately 20% to 30% higher than

inductor. The recommended inductors are listed in Table 4.

Table 4. List of Recommended Inductors

INDUCTANCE

CURRENT RATING

DIMENSIONS

DC RESISTANCE

TYPE

MANUFACTURER

[µH]

[mA]

[m

Ω typ]

2.2

2500

4 x 3.7 x 1.65

49

LQH44PN2R2MP0

Murata

2.2

3000

4 x 4 x 1.8

50

NRS4018T2R2MDGJ

Taiyo Yuden

11.2.1.3 Input and Output Capacitor Selection

The input capacitor is the low impedance energy source for the converter that helps provide stable operation.

ceramic capacitor is recommended for best filtering. For most applications, 4.7-µF input capacitance is sufficient;

a larger value reduces input voltage ripple.

The architecture of the TLV62565/6 allow use of tiny ceramic-type output capacitors with low equivalent series

resistance (ESR). These capacitors provide low output voltage ripple and are thus recommended. To keep its

resistance up to high frequencies and to achieve narrow capacitance variation with temperature, it is

recommended to use X7R or X5R dielectric. The TLV62565/6 are designed to operate with an output

capacitance of 10 µF to 47 µF, as outlined in Table 3.

14

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