TPS65257RHAT datasheet(6/34 Pages) TI1

No de pièce	TPS65257RHAT

Description	4.5-V TO 16-V INPUT, HIGH CURRENT, SYNCHRONOUS STEP DOWN THREE DC-DC CONVERTER WITH INTEGRATED FET, USB SWITCH AND PUSH BUTTON CONTROL

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Fabricant	TI1 [Texas Instruments]

Site Internet	http://www.ti.com

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TPS65257

SLVSB32

– SEPTEMBER 2011

www.ti.com

TERMINAL FUNCTIONS

NAME

NO.

I/O

DESCRIPTION

Current limit setting for Buck3. Fit a resistor from this pin to ground to set

RLIM3

1

I

the peak current limit on the output inductor.

Soft start pin for Buck3. Fit a small ceramic capacitor to this pin to set the

SS3

2

I

converter soft start time.

Compensation for Buck3. Fit a series RC circuit to this pin to complete

COMP3

3

O

the compensation circuit of this converter.

Feedback pin for Buck3. Connect a divider set to 0.8 V from the output of

FB3

4

I

the converter to ground.

PB_IN

5

I

Push button input (active low)

Oscillator set. This resistor sets the frequency of internal autonomous

ROSC

6

I

clock.

Feedback pin for Buck1. Connect a divider set to 0.8 V from the output of

FB1

7

I

the converter to ground.

Compensation pin for Buck1. Fit a series RC circuit to this pin to complete

COMP1

8

O

the compensation circuit of this converter.

Soft-start pin for Buck1. Fit a small ceramic capacitor to this pin to set the

SS1

9

I

converter soft-start time.

Current limit setting pin for Buck1. Fit a resistor from this pin to ground to

RLIM1

10

I

set the peak current limit on the output inductor.

Enable pin for Buck1. A high signal on this pin enables the regulator

EN1

11

I

Buck. For a delayed start-up add a small ceramic capacitor from this pin

to ground.

Bootstrap capacitor for Buck1. Fit a 47-nF ceramic capacitor from this pin

BST1

12

to the switching node.

VIN1

13

I

Input supply for Buck1. Fit a 10-

µF ceramic capacitor close to this pin.

LX1

14, 15

O

Switching node for Buck1

LX2

16, 17

O

Switching node for Buck2

VIN2

18

I

Input supply for Buck2. Fit a 10-

µF ceramic capacitor close to this pin.

Bootstrap capacitor for Buck2. Fit a 47-nF ceramic capacitor from this pin

BST2

19

to the switching node.

Enable pin for Buck2. A high signal on this pin enables the regulator. For

EN2

20

I

a delayed start-up add a small ceramic capacitor from this pin to ground.

Current limit setting pin for Buck2. Fit a resistor from this pin to ground to

RLIM2

21

I

set the peak current limit on the output inductor.

Soft-start pin for Buck2. Fit a small ceramic capacitor to this pin to set the

SS2

22

I

converter soft-start time.

Compensation pin for Buck2. Fit a series RC circuit to this pin to complete

COMP2

23

O

the compensation circuit of this converter.

Feedback input for Buck2. Connect a divider set to 0.8 V from the output

FB2

24

I

of the converter to ground.

Forces PWM operation in all converters when set high. If low converters

F_PWM

25

will operate in automatic PFM/PWM mode.

INT

26

O

Open drain interrupt output

Power good. Open drain output asserted low after all converters and

PGOOD

27

O

sequenced and within regulation. Polarity is factory selectable (active high

default).

Internal supply. Connect a 10-

µF ceramic capacitor from this pin to

V7V

28

O

ground.

Internal supply. Connect a 10-

µF ceramic capacitor from this pin to

V3V

29

O

ground.

GND

30

Ground

IC

31

I

This pin should be connected to V7V pin

USB_VIN

32

I

USB switch Input supply

USB_Vo

33

USB switch output

USB_EN

34

I

Enable input, high turns on the switch

6

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