SW

IN

OUT

OUT

L

L

MAX

,

OUT

MAX

,

L

f

L

V

V

1

V

I

2

I

I

I

´

-

´

=

D

D

+

=

13

TLV62080, TLV62084, TLV62084A

www.ti.com

SLVSAK9G – OCTOBER 2011 – REVISED SEPTEMBER 2016

Product Folder Links: TLV62080 TLV62084 TLV62084A

Submit Documentation Feedback

Copyright © 2011–2016, Texas Instruments Incorporated

(1)

See Third-party Products Disclaimer

9.2.2 Detailed Design Procedure

Table 5. List of Components

REFERENCE

DESCRIPTION

C1

10 μF, Ceramic Capacitor, 6.3 V, X5R, size 0603

Std

C2

22 μF, Ceramic Capacitor, 6.3 V, X5R, size 0805,

GRM21BR60J226ME39L

Murata

C3

47 μF, Tantalum Capacitor, 8 V, 35 mΩ, size 3528,

T520B476M008ATE035

Kemet

L1

1 μH, Power Inductor, 2.2 A, size 3 mm × 3 mm × 1.2 mm,

XFL3012-102MEB

Coilcraft

R1

65.3 kΩ, Chip Resistor, 1/16 W, 1%, size 0603

Std

R2

39.2 kΩ, Chip Resistor, 1/16 W, 1%, size 0603

Std

R3

178 kΩ, Chip Resistor, 1/16 W, 1%, size 0603

Std

9.2.2.1 Output Filter Design

The inductor and the output capacitor together provide a low pass frequency filter. To simplify this process

Table 6 outlines possible inductor and capacitor value combinations for the most application.

(1)

Capacitance tolerance and bias voltage de-rating is anticipated. The effective capacitance can vary by

+20% and –50%. Inductor tolerance and current de-rating is anticipated. The effective inductance can

vary by +20% and –30%.

(2)

Plus signs (+) indicates recommended filter combinations.

(3)

Filter combination in typical application.

Table 6. Matrix of Output Capacitor and Inductor Combinations

(1)

10

22

47

100

150

0.47

1

+

+

+

2.2

+

+

+

+

4.7

9.2.2.2 Inductor Selection

The main parameter for the inductor selection is the inductor value and then the saturation current of the

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

Where

•

•

•

•

L = Inductor value

(2)

space

out of Equation 2. A higher inductor value is also useful to lower ripple current, but increases the transient

response time as well. The following inductors are recommended to be used in designs (see Table 7).