TPS40400 datasheet(2/72 Pages) TI

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TPS40400

SLUS930B

– APRIL 2011 – REVISED OCTOBER 2011

www.ti.com

DESCRIPTION (CONTINUED)

An adaptive anti-cross conduction scheme is used to prevent shoot through current in the power FETs. Gate

drive voltage is 6 V to better enhance the power FETs for reduced losses. Short circuit detection is done by

sensing the voltage drop across the inductor or across a resistor placed in series with the inductor. A PMBus

programmable threshold is compared to this voltage and is used to detect overcurrent. When the overcurrent

threshold is reached, a pulse by pulse current limit scheme is used to limit current to acceptable levels. If the

overcurrent condition persists for more than 7 clock cycles of the converter, a fault condition is declared and the

converter shuts down and goes into either a hiccup restart mode or latches off. The behavior is selectable though

the PMBus interface. Other PMBus interface features include programmable operating frequency, soft-start time,

overvoltage and undervoltage thresholds and the response to those events, output voltage change including

margining as well as status monitoring.

ORDERING INFORMATION(1)(2)

PACKAGE

PINS

TAPE AND REEL QTY.

ORDERABLE NUMBER

250

TPS40400RHLT

Plastic QFN (RHL)

3000

TPS40400RHLR

(1)

For the most current package and ordering information see the Package Option Addendum at the end

of this document, or see the TI web site at www.ti.com.

(2)

Package drawings, thermal data, and symbolization are available at www.ti.com/packaging.

ABSOLUTE MAXIMUM RATINGS

VALUE

MIN

MAX

UNIT

VDD

–0.3

–5

BOOT

–0.3

BOOT-SW, HDRV-SW (Differential from BOOT or HDRV to SW)

–0.3

Input voltage range

VSNS+, TRACK, SYNC, FB

–0.3

DATA, CLK, CNTL

–0.3

3.6

ISNS+, ISNS

–

–0.3

VSNS

–

–0.3

0.3

HDRV

–0.3

BP3

–0.3

3.8

Output voltage range

BP6, COMP, PGOOD, DIFFO, LDRV

–0.3

SMBALRT, ADDR0

–0.3

3.6

Operating junction temperature range

–40

150

°C

TSTG

Storage temperature range

–55

150

°C

PACKAGE DISSIPATION RATINGS

(1)

THERMAL IMPEDANCE

TA = 25°C

TA = 85°C

PACKAGE

JUNCTION-TO-AMBIENT

AIRFLOW

POWER RATING

(

°C/W)

(W)

31.1

Natural Convection

3.21

1.29

24-Pin Plastic

25.2

200 LFM

3.96

1.58

QFN (RHL)

400 LFM

4.36

1.74

(1)

Ratings based on JEDEC High Thermal Conductivity (High K) Board. For more information on the test method, see TI Technical Brief

SZZA017.

RECOMMENDED OPERATING CONDITIONS

MIN

TYP

MAX

UNIT

VDD

Input operating voltage

3.0

Operating junction temperature

–40

125

°C

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