8.2.2.2.2 Schottky Diode Selection

The high switching frequency of TPS61322xx demands a high-speed rectifying switch for optimum efficiency.

Ensure that the average and peak current rating of the diode exceeds the average output current and peak

inductor current. In addition, the reverse breakdown voltage of the diode must exceed the maximum output

voltage of the converter. A snubber circuit consisting of a resistor R1 and a capacitor C2 is needed if the

Schottky diode D1 is soldered. The capacitance of C2 must be larger than triple times of the diode capacitance.

The typical value of the resistor R1 is 5 Ω, and the typical value of the capacitor C2 is 120 pF.

8.2.2.2.3 Capacitor Selection

Refer to Section 8.2.1.2.5 for the detailed design steps.Table 8-6 lists the recommended inductor and capacitor

combination. Three 10-μF capacitors in parallel are recommended to get the desired effective capacitance.

Table 8-6. List of Inductor and Capacitor

INDUCTAN

CE [µH]

CAPACITANCE [µF]

LOAD [mA]

PACKAGE

PART NUMBER

MANUFACTURER(1)

1

3 × 10

500

0603

GRM188R60J106ME84D

MURATA

2.2

3 × 10

500

0603

GRM188R60J106ME84D

MURATA

4.7

2 × 22

500

0805

GRM21BZ71A226ME15

MURATA

(1)

See Third-party Products Disclaimer

8.2.2.3 Application Curves

VIN = 3.6 V TPS613222A

IOUT = 0.1 mA

Figure 8-10. Switching Waveform at Light Load

VIN = 3.6 V TPS613222A

IOUT = 100 mA

Figure 8-11. Switching Waveform at Heavy Load

VIN = 3.6 V

TPS613222A

IOUT = 500 mA

Figure 8-12. Switching Waveform at Heavy Load

VIN = 3.6 V

TPS613222A

Rload = 250 Ω

Figure 8-13. Start-up by VIN

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TPS61322

SLVSDY5E – JANUARY 2018 – REVISED FEBRUARY 2024

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Product Folder Links: TPS61322