OUT

VFB

V

R1 =

-1 ×R2

V

æ

ö

ç

÷

è

ø

(

)

ON

IN

OUT

ON

OFF(MIN)

T

K= V -V

×

T

-T

2

LOAD

OUT

OUT

US

ΔI

C

=

×L

2×K×ΔV

2

LOAD

OUT

OUT

OUT

OS

ΔI

C

=

×L

2×V

×ΔV

L(RIPPLE)

OUT

OUT(RIPPLE)

SW

I

1

C

=

×

8×V

f

16

TPS53014

SLVSBF1A – MAY 2012 – REVISED FEBRUARY 2019

www.ti.com

Product Folder Links: TPS53014

Submit Documentation Feedback

Copyright © 2012–2019, Texas Instruments Incorporated

Typical Application (continued)

8.1.1.1.2

Output Capacitor

The capacitor value and ESR determines the amount of output voltage ripple and load transient response.

Ceramic output capacitors with X5R dielectric or better are recommended .

(8)

(9)

(10)

Where:

•

ΔVOS = The allowable amount of overshoot voltage in load transition

•

ΔVUS = The allowable amount of undershoot voltage in load transition

•

TOFF(MIN) = Minimum off time

(11)

Select the capacitance value greater than the largest value calculated from Equation 8, Equation 9 and

Equation 10. The minimum recommended output capacitance is 44 μF.

8.1.1.1.3

Input Capacitor

The TPS53014 requires an input decoupling capacitor and a bulk capacitor is needed depending on the

application. A minimum 10-μF high-quality ceramic capacitor is recommended for the input capacitor. The

capacitor voltage rating needs to be greater than the maximum input voltage.

8.1.1.1.4

Bootstrap Capacitor

The TPS53014 requires a bootstrap capacitor from SW to VBST to provide the floating supply for the high-side

drivers. A minimum 0.1-μF high-quality ceramic capacitor is recommended. The capacitor voltage rating should

be greater than 10 V.

8.1.1.1.5

VREG5 Capacitor

The TPS53014 requires that the VREG5 regulator is bypassed. A minimum 4.7-μF high-quality ceramic capacitor

must be connected between the VREG5 and PGND for proper operation. The capacitor voltage rating should be

greater than 10 V.

8.1.1.1.6

Choose Output Voltage Resistors

The output voltage is set with a resistor divider from output voltage node to the VFB pin. TI recommends using

1% tolerance or better resistors. Select R2 between 10 k

Ω and 100 kΩ and use Equation 12 to calculate R1.

(12)

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