TPS5615, TPS5618, TPS5625, TPS5633

SYNCHRONOUS-BUCK HYSTERETIC REGULATOR CONTROLLER

SLVS177A – SEPTEMBER 1998 – REVISED NOVEMBER 1998

1

POST OFFICE BOX 655303

Temperature Range

Efficiency

1.8 V, 2.5 V, and 3.3 V

description

The TPS5615 family of synchronous-buck regulator controllers provides an accurate supply voltage to DSPs.

The output voltage is internally set by a resistive divider with an accuracy of 1% over the full operating

temperature range. A hysteretic controller with user-selectable hysteresis is used to dramatically reduce

overshoot and undershoot caused by load transients. Propagation delay from the comparator inputs to the

output drivers is less than 250 ns. Overcurrent shutdown and crossover protection for the output drivers

combine to eliminate destructive faults in the output FETs. PWRGD monitors the output voltage and pulls the

open-collector output low when the output drops below 93% of the nominal output voltage. An overvoltage circuit

disables the output drivers if the output voltage rises 15% above the nominal value. The inhibit pin can be used

to control power sequencing. Inhibit and undervoltage lockout assures that the 12-V supply voltage and system

supply voltage (5 V or 3.3 V) are within proper operating limits before the controller starts. The output driver

circuits include 2-A drivers with internal 8-V gate-voltage regulators that can easily provide sufficient power for

today’s high-powered DSPs. The high-side driver can be configured either as a ground-referenced driver or as

a floating bootstrap driver. The TPS5615 family is available in a 28-pin TSSOP PowerPad

™ package. It operates

over a junction temperature range of 0

°C to 125°C.

AVAILABLE OPTIONS

PACKAGE

TJ

OUTPUT VOLTAGE

TSSOP†

(PWP)

1.5 V

TPS5615PWP

0

°Cto125°C

1.8 V

TPS5618PWP

0

°C to 125°C

2.5 V

TPS5625PWP

3.3 V

TPS5633PWP

† The PWP package is availble taped and reeled. Add R suffix to

device type (e.g., TPS5615PWPR).

Copyright

© 1998, Texas Instruments Incorporated

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.

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.

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28

27

26

25

24

23

22

21

20

19

18

17

16

15

IOUT

AGND2

OCP

VHYST

VREFB

VSENSE

ANAGND

SLOWST

BIAS

LODRV

LOHIB

DRVGND

LOWDR

DRV

PWRGD

NC

NC

NC

NC

NC

INHIBIT

IOUTLO

LOSENSE

HISENSE

BOOTLO

HIGHDR

BOOT

PWP PACKAGE

(TOP VIEW)

NC – No internal connection

PowerPAD is a trademark of Texas Instruments Incorporated.