TPS5124

SLUS571 − SEPTEMBER 2003

DUAL CHANNEL, SYNCHRONOUS

STEPDOWN PWM CONTROLLER

1

www.ti.com

FEATURES

Temperature Compensation

500-kHz Operation

Channel − Easy Power Sequencing

APPLICATIONS

DESCRIPTION

The TPS5124 is dual independent high efficiency

synchronous step-down controller. It supports a

low-voltage/high-current power supply applica−

tions that use either a 5-V or 12-V bus voltage.

Since both controllers of the TPS5124 operate

180 degree out-of-phase, the input current ripple

is

minimized

resulting

in

a

smaller

input

capacitance and reduced power supply cost.

The

current

protection

circuit

detects

the

drain-to-source voltage drop across the high-side

and

low-side

power

MOSFET

while

it

is

conducting. Also, the current protection circuit has

a temperature coefficient to compensate for the

of

the

MOSFET.

This

resistor-less current protection and built-in boost

diode simplify the system design and reduces the

external parts count. Other features such as

undervoltage lockout, overvoltage, undervoltage,

and

programmable

short-circuit

protection

promote system reliability.

VO1

VO2

VIN

1

2

3

4

5

6

7

8

9

10

11

12

TPS5124

FB2

SS2

N/C

SCP

STBY2

STBY1

REF

GND

N/C

CT

SS1

FB1

17

16

20

19

18

VLSD

VREF5

LH2

OUT2_U

LL2

23

22

21

26

25

24

29

28

27

30

OUT2_D

OUTGND2

TRIP2

VCC

TRIP1

OUTGND1

OUT1_D

LL1

OUT1_U

LH1

13

14

15 INV2

INV1

N/C

VIN

VO2

VIN

VO1

VIN

UDG−03123

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.