TPS2838, TPS2839

TPS2848, TPS2849

SLVS367A − MARCH 2001 − REVISED JUNE 2001

SYNCHRONOUSBUCK MOSFET DRIVERS

WITH DRIVE REGULATOR

1

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FEATURES

Thermal Performance

APPLICATIONS

Power Supplies

DESCRIPTION

The TPS2838/39/48/49 devices are MOSFET

drivers

designed

for

high-performance

synchronous power supplies. The drivers can

source and sink up to 4-A peak current at a 14-V

drive voltage. These are ideal devices to use with

power supply controllers that do not have on-chip

drivers. The low-side driver is capable of driving

loads of 3.3 nF in 10-ns rise/fall times and has

40-ns propagation delays at room temperature.

The MOSFET drivers have an integrated 150-mA

regulator, so the gate drive voltage can be

optimized for specific MOSFETs. The TPS2848

and TPS2849 have a fixed 8-V drive regulator,

while the TPS2838/39 allow the drive regulator to

be adjusted from 4 V to 14 V by selection of two

external resistors.

The devices feature VDRV to PGND shoot-

through

protection

with

adaptive/adjustable

deadtime control. The deadtime, for turning on the

high-side FET from LOWDR transitioning low, is

adjustable with an external capacitor on the

DELAY pin. This allows compensation for the

effect the gate resistor has on the synchronous

FET turn off. The adaptive deadtime prevents the

turning on of the low-side FET until the voltage on

the BOOTLO pin falls below a threshold after the

high-side FET stops conducting. The high-side

drive can be configured as a ground referenced

driver or a floating bootstrap driver. The internal

Schottky diode minimizes the size and number of

external components needed for the bootstrap

driver circuit. Only one external ceramic capacitor

is required to configure the bootstrap driver.

1

2

3

4

5

6

7

14

13

12

11

10

9

8

ENABLE

IN

PWRRDY

DELAY

NC

DT

AGND

BOOT

HIGHDR

BOOTLO

VDRV

LOWDR

PGND

Thermal

Pad

TPS2848, TPS2849

PWP PACKAGE

(TOP VIEW)

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

ENABLE

IN

PWRRDY

DELAY

SYNC

ADJ

DT

AGND

BOOT

HIGHDR

BOOTLO

VDRV

LOWDR

NC

PGND

Thermal

Pad

TPS2838, TPS2839

PWP PACKAGE

(TOP VIEW)

ACTUAL SIZE

(5,1 mm x 6,6 mm)

ACTUAL SIZE

(5,1 mm x 6,6 mm)

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

 2001, Texas Instruments Incorporated

PowerPAD is a trademark of Texas Instruments.

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.