DEVICE INFORMATION

PIN ASSIGNMENTS

24

23

22

21

20

19

18

17

910111213141516

3231302928272625

VDCDC3

PGND3

L3

VINDCDC3

VINDCDC1

L1

PGND1

VDCDC1

EN_Vdd_alive

MODE

DEFDCDC2

PWRFAIL

EN_DCDC1

EN_DCDC2

EN_DCDC3

EN_LDO

1

2

3

4

5

6

7

8

TPS650250

TPS650250

TERMINAL FUNCTIONS

TERMINAL

I/O

DESCRIPTION

NAME

NO.

SWITCHING REGULATOR SECTION

AGND1

31

Analog ground connection. All analog ground pins are connected internally on the chip.

AGND2

13

Analog ground connection. All analog ground pins are connected internally on the chip.

PowerPad

–

Connect the power pad to analog ground.

I

Input voltage for VDCDC1 step-down converter. This must be connected to the same voltage supply as

VINDCDC1

5

VINDCDC2, VINDCDC3 and VCC.

L1

6

Switch pin of VDCDC1 converter. The VDCDC1 inductor is connected here.

VDCDC1

8

I

VDCDC1 feedback voltage sense input, connect directly to VDCDC1

PGND1

7

Power ground for VDCDC1 converter

I

Input voltage for VDCDC2 step-down converter. This must be connected to the same voltage supply as

VINDCDC2

28

VINDCDC1, VINDCDC3 and VCC.

L2

27

Switch pin of VDCDC2 converter. The VDCDC2 inductor is connected here.

VDCDC2

25

I

VDCDC2 feedback voltage sense input, connect directly to VDCDC2

PGND2

26

Power ground for VDCDC2 converter

I

Input voltage for VDCDC3 step-down converter. This must be connected to the same voltage supply as

VINDCDC3

4

VINDCDC1, VINDCDC2 and VCC.

L3

3

Switch pin of VDCDC3 converter. The VDCDC3 inductor is connected here.

VDCDC3

1

I

VDCDC3 feedback voltage sense input, connect directly to VDCDC3

PGND3

2

Power ground for VDCDC3 converter

Power supply for digital and analog circuitry of DCDC1, DCDC2 and DCDC3 DC-DC converters. This must be

Vcc

29

I

connected to the same voltage supply as VINDCDC3, VINDCDC1 and VINDCDC2.

Input signal indicating default VDCDC1 voltage, 0 = 2.8V, 1 = 3.3V

DEFDCDC1

9

I

This pin can also be connected to a resistor divider between VDCDC1 and GND. In this case the output

voltage of the DCDC1 converter can be set in a range from 0.6V to VINDCDC1

Input signal indicating default VDCDC2 voltage, 0 = 1.8V, 1 = 2.5V

DEFDCDC2

22

I

This pin can also be connected to a resistor divider between VDCDC2 and GND. In this case the output

voltage of the DCDC2 converter can be set in a range from 0.6V to VINDCDC2.

Copyright © 2008, Texas Instruments Incorporated

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9

Product Folder Link(s): TPS650250