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TPS54719 데이터시트(PDF) 5 Page - Texas Instruments |
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TPS54719 데이터시트(HTML) 5 Page - Texas Instruments |
5 / 40 page TPS54719 www.ti.com SLVSB69A – JUNE 2012 – REVISED JULY 2014 6.4 Thermal Information TPS54719 THERMAL METRIC(1) UNITS RTE (16 PINS) RθJA Junction-to-ambient thermal resistance (standard board) 49.1 RθJA Junction-to-ambient thermal resistance (custom board)(2) 37.0 ψJT Junction-to-top characterization parameter 0.7 ψJB Junction-to-board characterization parameter 21.8 °C/W RθJC(top) Junction-to-case(top) thermal resistance 50.7 RθJC(bot) Junction-to-case(bottom) thermal resistance 7.5 RθJB Junction-to-board thermal resistance 21.8 (1) Power rating at a specific ambient temperature TA should be determined with a junction temperature of 140°C. This is the point where distortion starts to substantially increase. See power dissipation estimate in the application section of this data sheet for more information. (2) Test boards conditions: (a) 2 inches x 2 inches, 4 layers, thickness: 0.062 inch (b) 2 oz. copper traces located on the top of the PCB (c) 2 oz. copper ground planes on the 2 internal layers and bottom layer (d) 4 thermal vias (10mil) located under the device package 6.5 Electrical Characteristics TJ = –40°C to 140°C, VIN = 2.95 to 6 V (unless otherwise noted) DESCRIPTION CONDITIONS MIN TYP MAX UNIT SUPPLY VOLTAGE (VIN PIN) Operating input voltage 2.95 6 V Internal under voltage lockout threshold Rising VIN 2.4 2.8 V Internal UVLO hysteresis 0.2 V Shutdown supply current EN = 0 V, 2.95 V ≤ VIN ≤ 6 V 1 5 μA Quiescent Current - Iq VSENSE = 620 mV, RT = 84 kΩ 455 550 μA ENABLE AND UVLO (EN PIN) Enable threshold Rising 1.16 1.25 1.37 V Falling 1.18 Enable threshold + 50 mV -3.6 Input current μA Enable threshold – 50 mV -0.7 VOLTAGE REFERENCE (VSENSE PIN) 2.95 V ≤ VIN ≤ 6 V, –40°C <TJ < 140°C 0.591 0.600 0.609 Voltage Reference V 25°C 0.594 0.600 0.606 MOSFET BOOT-PH = 5 V; TJ = 25°C 26 60 High side switch resistance m Ω BOOT-PH = 2.95 V; TJ = 25°C 35 70 VIN = 5 V; TJ = 25°C 26 60 Low side switch resistance m Ω VIN = 2.95 V; TJ = 25°C 35 70 ERROR AMPLIFIER Input current 50 nA Error amplifier transconductance (gm) –2 μA < I(COMP) < 2 μA, V(COMP) = 1 V 250 μmhos Error amplifier transconductance (gm) during –2 μA < I(COMP) < 2 μA, V(COMP) = 0.9 V, 85 μmhos slow start Vsense = 0.3 V Error amplifier source/sink V(COMP) = 1 V, 100 mV overdrive ±20 μA COMP to Iswitch gm 25 A/V CURRENT LIMIT Current limit threshold 8.5 10.5 A Low-side reverse current limit –1.5 –2.7 A Copyright © 2012–2014, Texas Instruments Incorporated Submit Documentation Feedback 5 Product Folder Links: TPS54719 |
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