Table 10-1. Typical Inductors (continued)

TYPE

INDUCTANCE

[µH]

CURRENT [A]

(1)

FOR DEVICE

NOMINAL

SWITCHING

FREQUENCY

DIMENSIONS

[LxBxH] mm

MANUFACTURER(2)

XEL4020-561ME

0.56 µH, ±20%

9.9

TPS62810-Q1,

TPS62813-Q1,

TPS62812-Q1

2.25 MHz

4 × 4 × 2.1

Coilcraft

XEL4030-471ME

0.47 µH, ±20%

12.3

TPS62810-Q1,

TPS62813-Q1,

TPS62812-Q1

2.25 MHz

4 × 4 × 3.1

Coilcraft

XEL3515-561ME

0.56 µH, ±20%

4.5

TPS62813-Q1,

TPS62812-Q1

2.25 MHz

3.5 × 3.2 × 1.5

Coilcraft

XFL3012-331MEB

0.33 µH, ±20%

2.6

TPS62811-Q1

TPS62812-Q1

≥ 3.5 MHz

3 × 3 × 1.3

Coilcraft

XPL2010-681ML

0.68 µH, ±20%

1.5

TPS62811-Q1

2.25 MHz

2 x 1.9 x 1

Coilcraft

DFE252012PD-R47M

0.47 µH, ±20%

see data sheet

TPS62812-Q1,

TPS62813-Q1

2.25 MHz

2.5 × 2 × 1.2

Murata

(1)

Lower of IRMS at 20°C rise or ISAT at 20% drop.

(2)

See the Third-party Products Disclaimer.

Calculating the maximum inductor current using the actual operating conditions gives the minimum saturation

current of the inductor needed. TI recommends a margin of about 20% to add. A larger inductor value is also

useful to get lower ripple current, but increases the transient response time and size as well.

10.1.3 Capacitor Selection

10.1.3.1 Input Capacitor

For most applications, 22 µF nominal is sufficient and recommended. The input capacitor buffers the input

voltage for transient events and also decouples the converter from the supply. TI recommends a low-ESR

multilayer ceramic capacitor (MLCC) for best filtering and must be placed between VIN and GND as close as

possible to those pins.

10.1.3.2 Output Capacitor

The architecture of the TPS6281x-Q1 allows the use of tiny ceramic output capacitors with low equivalent series

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

resistance up to high frequencies and to get narrow capacitance variation with temperature, TI recommends to

use dielectric X7R, X7T, or an equivalent. Using a higher value has advantages like smaller voltage ripple and

a tighter DC output accuracy in power save mode. By changing the device compensation with a resistor from

COMP/FSET to GND, the device can be compensated in three steps based on the minimum capacitance used

on the output. The maximum capacitance is 470 µF in any of the compensation settings.

The minimum capacitance required on the output depends on the compensation setting as well as on the current

rating of the device. TPS62810-Q1 and TPS62813-Q1 require a minimum output capacitance of 27 µF while

the lower current versionsTPS62812-Q1and TPS62811-Q1 requires 15 µF at minimum. The required output

capacitance also changes with the output voltage.

For output voltages below 1 V, the minimum increases linearly from 32 µF at 1 V to 53 µF at 0.6 V for

the TPS62810-Q1, the TPS62813-Q1 with the compensation setting for smallest output capacitance. Other

compensation ranges for TPS62811-Q1 and TPS62812-Q1 , or both are equivalent. See Table 9-1 and Table 9-2

for details.

TPS62810-Q1, TPS62811-Q1, TPS62812-Q1, TPS62813-Q1

SLVSDU1J – AUGUST 2018 – REVISED MARCH 2023

www.ti.com

18

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