Datasheet

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) 24
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 22
SW –5 27
BOOT –0.3 30
BOOT-SW, HDRV-SW (Differential from BOOT or HDRV to SW) –0.3 7
Input voltage range V
VSNS+, TRACK, SYNC, FB –0.3 7
DATA, CLK, CNTL –0.3 3.6
ISNS+, ISNS– –0.3 15
VSNS– –0.3 0.3
HDRV –0.3 30
BP3 –0.3 3.8
Output voltage range V
BP6, COMP, PGOOD, DIFFO, LDRV –0.3 7
SMBALRT, ADDR0 –0.3 3.6
T
J
Operating junction temperature range –40 150 °C
T
STG
Storage temperature range –55 150 °C
PACKAGE DISSIPATION RATINGS
(1)
THERMAL IMPEDANCE T
A
= 25°C T
A
= 85°C
PACKAGE JUNCTION-TO-AMBIENT AIRFLOW POWER RATING POWER RATING
(°C/W) (W) (W)
31.1 Natural Convection 3.21 1.29
24-Pin Plastic
25.2 200 LFM 3.96 1.58
QFN (RHL)
23 400 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 20 V
T
J
Operating junction temperature –40 125 °C
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