³

´

2

L

C

2

´

>

´

OUT

OUT

IN

V

I

0.8

100 mA

V

TLV61220

www.ti.com

SLVSB53 – MAY 2012

For selecting the inductor this would be the suitable value for the current rating. It also needs to be taken into

account that load transients and error conditions may cause higher inductor currents.

Equation 4 helps to estimate whether the device will work in continuous or discontinuous operation depending on

the operating points. As long as the inequation is true, continuous operation is typically established. If the

inequation becomes false, discontinous operation is typically established.

(4)

The following inductor series from different suppliers have been used with TLV61220 converters:

Table 2. List of Inductors

VENDOR

INDUCTOR SERIES

Toko

DFE252010C

EPL3015

Coilcraft

EPL2010

Murata

LQH3NP

Taiyo Yuden

NR3015

Wurth Elektronik

WE-TPC Typ S

Capacitor Selection

Input Capacitor

At least a 10-

μF input capacitor is recommended to improve transient behavior of the regulator and EMI behavior

of the total power supply circuit. A ceramic capacitor placed as close as possible to the VBAT and GND pins of

the IC is recommended.

Output Capacitor

the VOUT and GND pins of the IC. If, for any reason, the application requires the use of large capacitors which

can not be placed close to the IC, the use of a small ceramic capacitor with an capacitance value of around

2.2

μF in parallel to the large one is recommended. This small capacitor should be placed as close as possible to

the VOUT and GND pins of the IC.

A minimum capacitance value of 4.7

μF should be used, 10 μF are recommended. If the inductor value exceeds

4.7

μH, the value of the output capacitance value needs to be half the inductance value or higher for stability

reasons, see Equation 5.

(5)

The TLV61220 is not sensitive to the ESR in terms of stability. Using low ESR capacitors, such as ceramic

capacitors, is recommended anyway to minimize output voltage ripple. If heavy load changes are expected, the

output capacitor value should be increased to avoid output voltage drops during fast load transients.

Copyright © 2012, Texas Instruments Incorporated

Submit Documentation Feedback

13

Product Folder Link(s): TLV61220