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TPS40400_1110 Datasheet(PDF) 2 Page - Texas Instruments |
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TPS40400_1110 Datasheet(HTML) 2 Page - Texas Instruments |
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2 / 72 page  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 TJ 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 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 TJ Operating junction temperature –40 125 °C 2 Submit Documentation Feedback Copyright © 2011, Texas Instruments Incorporated Product Folder Link(s) :TPS40400 |
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