TPS54292 datasheet(12/35 Pages) TI1

Part #	TPS54292

Description	1.5-A/2.5-A Dual, Fully-Synchronous Buck Converter With Integrated MOSFET

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Manufacturer	TI1 [Texas Instruments]

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( )

OUT

REF

R1

V

1

V

R2

æ

ö

=

´

+

ç

÷

è

ø

1

2

3

4

16

15

14

13

PVDD2

BOOT2

SW2

PGND2

PVDD1

BOOT1

SW1

PGND1

TPS54290

5

6

7

12

11

10

BP

GND

FB2

EN1

EN2

FB1

R1

V

OUT1

R2

UDG-09131

8

9

COMP1

COMP2

IN

OUT

V

L

I

-

=

D

TPS54290, TPS54291, TPS54292

SLUS973 – OCTOBER 2009

www.ti.com

OUTPUT VOLTAGE REGULATION

The regulation output voltage is determined by a resistor divider connecting the output node, the FBx pin, and

GND (Figure 14). The value of the output voltage is shown in Equation 2.

(2)

where

•

VREF is the internal 0.8-V reference voltage

Figure 14. Feedback Network for Channel1

INDUCTOR SELECTION

Equation 3 calculates the inductance value so that the output ripple current falls from 20% to 40% of the full load

current.

(3)

12

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