9.2.1.2.3 Flying Capacitor (C(fly))

Increasing the flying capacitor's size reduces the output resistance. Small values increases the output

resistance. Above a certain point, increasing C(fly)'s capacitance has a negligible effect, because the output

resistance becomes dominated by the internal switch resistance and capacitor ESR.

9.2.1.2.4 Output Capacitor (CO)

Increasing the output capacitor's size reduces the output ripple voltage. Decreasing its ESR reduces both output

resistance and ripple. Smaller capacitance values can be used with light loads if higher output ripple can be

tolerated. Use the following equation to calculate the peak-to-peak ripple.

V

O(ripple) +

I

O

fosc

Co

) 2

I

O

ESR

CO

(6)

Table 9-1. Recommended Capacitor Values

DEVICE

VI

[V]

IO

[mA]

CI

[µF]

C(fly)

[µF]

CO

[µF]

TPS60400

1.8…5.5

60

1

1

1

TPS60401

1.8…5.5

60

10

10

10

TPS60402

1.8…5.5

60

3.3

3.3

3.3

TPS60403

1.8…5.5

60

1

1

1

Table 9-2. Recommended Capacitors

MANUFACTURER

PART NUMBER

SIZE

CAPACITANCE

TYPE

Taiyo Yuden

EMK212BJ474MG

0805

0.47 µF

Ceramic

LMK212BJ105KG

0805

1 µF

Ceramic

LMK212BJ225MG

0805

2.2 µF

Ceramic

EMK316BJ225KL

1206

2.2 µF

Ceramic

LMK316BJ475KL

1206

4.7 µF

Ceramic

JMK316BJ106KL

1206

10 µF

Ceramic

TDK

C2012X5R1C105M

0805

1 µF

Ceramic

C2012X5R1A225M

0805

2.2 µF

Ceramic

C2012X5R1A335M

0805

3.3 µF

Ceramic

Table 9-3 contains a list of manufacturers of the recommended capacitors. Ceramic capacitors will provide the

lowest output voltage ripple because they typically have the lowest ESR-rating.

Table 9-3. Recommended Capacitor Manufacturers

CAPACITOR TYPE

MANUFACTURER

WEB ADDRESS

X5R / X7R ceramic

Taiyo Yuden

www.t-yuden.com

X5R / X7R ceramic

TDK

www.component.tdk.com

X5R / X7R ceramic

Vishay

www.vishay.com

X5R / X7R ceramic

Kemet

www.kemet.com

TPS60400, TPS60401, TPS60402, TPS60403

SLVS324C – JULY 2001 – REVISED OCTOBER 2020

www.ti.com

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