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LM2734XMKX/NOPB bảng dữ liệu(PDF) 5 Page - Texas Instruments |
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LM2734XMKX/NOPB bảng dữ liệu(HTML) 5 Page - Texas Instruments |
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5 / 36 page  LM2734Z, LM2734Z-Q1 www.ti.com SNVS334F – JANUARY 2005 – REVISED JANUARY 2016 6.4 Thermal Information LM2734Z THERMAL METRIC(1) DDC (SOT) NGG (WSON) UNIT 6 PINS 6 PINS RθJA Junction-to-ambient thermal resistance(2) 180.3 56.2 °C/W RθJC(top) Junction-to-case (top) thermal resistance 51.6 52.6 °C/W RθJB Junction-to-board thermal resistance 27.7 30.7 °C/W ψJT Junction-to-top characterization parameter 1.2 0.9 °C/W ψJB Junction-to-board characterization parameter 27.3 30.8 °C/W RθJC(bot) Junction-to-case (bottom) thermal resistance — 10.7 °C/W (1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application report (SPRA953). (2) Thermal shutdown occurs if the junction temperature exceeds 165°C. The maximum power dissipation is a function of TJ(MAX), RθJA and TA . The maximum allowable power dissipation at any ambient temperature is PD = (TJ(MAX) – TA)/RθJA . All numbers apply for packages soldered directly onto a 3-in × 3-in printed-circuit-board with 2-oz. copper on 4 layers in still air. For a 2-layer board using 1-oz. copper in still air, RθJA = 204°C/W. 6.5 Electrical Characteristics All typical specifications are for TJ = 25°C, and all maximum and minimum limits apply over the full operating temperature range (TJ = –40°C to 125°C). VIN = 5 V, VBOOST – VSW = 5 V (unless otherwise noted). Data sheet minimum and maximum specification limits are specified by design, test, or statistical analysis. PARAMETER TEST CONDITIONS MIN(1) TYP(2) MAX(1) UNIT VFB Feedback voltage 0.784 0.8 0.816 V ΔVFB/ΔVIN Feedback voltage line regulation VIN = 3 V to 20 V 0.01 % / V IFB Feedback input bias current Sink and source 10 250 nA Undervoltage lockout VIN Rising 2.74 2.90 UVLO Undervoltage lockout VIN Falling 2 2.3 V UVLO hysteresis 0.30 0.44 0.62 FSW Switching frequency 2.2 3.0 3.6 MHz DMAX Maximum duty cycle 78% 85% DMIN Minimum duty Cycle 8% VBOOST - VSW = 3 V 300 600 m Ω (SOT Package) RDS(ON) Switch ON resistance VBOOST - VSW = 3 V 340 650 m Ω (WSON Package) ICL Switch current limit VBOOST - VSW = 3 V 1.2 1.7 2.5 A Quiescent current Switching 1.5 2.5 mA IQ Quiescent current (shutdown) VEN = 0 V 30 nA IBOOST Boost pin current (Switching) 4.25 6 mA Shutdown threshold voltage VEN Falling 0.4 VEN_TH V Enable threshold voltage VEN Rising 1.8 IEN Enable pin current Sink/source 10 nA ISW Switch leakage 40 nA (1) Specified to Texas Instruments' Average Outgoing Quality Level (AOQL). (2) Typicals represent the most likely parametric norm. Copyright © 2005–2016, Texas Instruments Incorporated Submit Documentation Feedback 5 Product Folder Links: LM2734Z LM2734Z-Q1 |
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