TPS51020

SLUS564B − JULY 2003 − REVISED DECEMBER 2003

DUAL, VOLTAGE MODE, DDR SELECTABLE, SYNCHRONOUS,

STEPDOWN CONTROLLER FOR NOTEBOOK SYSTEM POWER

1

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FEATURES

Channels

APPLICATIONS

DESCRIPTION

The

TPS51020

is

a

multi-function

dual-

synchronous step-down controller for notebook

system power. The part is specifically designed

for high performance, high efficiency applications

where the loss associated with a current sense

resistor is unacceptable. The TPS51020 utilizes

feed forward voltage mode control to attain high

efficiency

without

sacrificing

line

response.

Efficiency at light load conditions can be

maintained high as well by incorporating autoskip

operation. A selectable, Suspend to RAM (STR)

supported, DDR option provides a one chip

solution for all switching applications from

5-V/3.3-V supply to a complete DDR termination

solution.

ORDERING INFORMATION

TA

PLASTIC TSSOP (DBT)

−40

°C to 85°C

TPS51020DBT

−40

°C to 85°C

TPS51020DBTR (T&R)

SIMPLIFIED

APPLICATION

DIAGRAM

UDG−03144

VO1

1

2

3

4

5

6

7

8

9

10

11

12

TPS51020

COMP2

SSTRT2

PGOOD

VO2

ENBL2

ENBL1

REF_X

GND

DDR

VO1_VDDQ

SSTRT1

COMP1

17

16

20

19

18

REG5_IN

VREG5

VBST2

OUT2_U

LL2

23

22

21

26

25

24

29

28

27

30

OUT2_D

OUTGND2

VIN

TRIP1

OUTGND1

OUT1_D

LL1

OUT1_U

VBST1

13

14

15 INV2

INV1

SKIP

VIN

VIN

VO2

VIN

VO2

VO1

VIN

VO1

VO2

VREG5

TRIP2

VREG5

EXT_5V

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

Copyright

 2003, Texas Instruments Incorporated

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.