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TPS54678 Datasheet(PDF) 5 Page - Texas Instruments |
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TPS54678 Datasheet(HTML) 5 Page - Texas Instruments |
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5 / 42 page  TPS54678 www.ti.com SLVSBF3A – JUNE 2012 – REVISED NOVEMBER 2015 6.5 Electrical Characteristics TJ = –40°C to +150°C, VIN = 2.95 to 6 V (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT SUPPLY VOLTAGE (VIN PIN) Operating input voltage 2.95 6 V Shutdown supply current EN = 0 V, 25°C, 2.95 V ≤ VIN ≤ 6 V 1 3 µA Operating non-switching supply current VSENSE = 0.6 V, VIN = 5 V, 25°C, fSW = 500 kHz 570 800 µA ENABLE AND UVLO (EN PIN) Enable threshold Rising 1.3 V Enable threshold Falling 1.18 V Input current Enable threshold + 50 mV –3.5 µA Input current Enable threshold – 50 mV –0.70 µA VOLTAGE REFERENCE Voltage reference 2.95 V ≤ VIN ≤ 6 V, –40°C < TJ < 150°C 0.594 0.600 0.606 V MOSFET High-side switch resistance BOOT-PH = 5 V 12 25 m Ω High-side switch resistance BOOT-PH = 2.95 V 17 33 Low-side switch resistance BOOT-PH = 5 V 12 25 m Ω Low-side switch resistance BOOT-PH = 2.95 V 17 33 ERROR AMPLIFIER Input current 7 nA Error amplifier transconductance (gm) –2 µA < I(COMP) < 2 µA V(COMP) = 1 V 245 umhos Error amplifier transconductance (gm) –2 µA < I(COMP) < 2 µA V(COMP) = 1 V, V(VSENSE) = 0.4 V 80 umhos during slow-start Error amplifier source and sink V(COMP) = 1 V 100-mV Overdrive ±20 µA COMP to Iswitch gm 20 A/V CURRENT LIMIT Current limit threshold Fs = 500 KHz 9.5 10.5 11.5 A Cycles before entering hiccup during 512 cycles overcurrent Hiccup cycles 16384 cycles Low-side sourcing current threshold 7 8.5 10.5 A Low-side FET reverse current 4 A protection THERMAL SHUTDOWN Thermal shutdown 170 °C Hysteresis 15 °C TIMING RESISTOR AND EXTERNAL CLOCK (RT/CLK PIN) Switching frequency range using RT 200 2000 kHz mode Switching frequency Rt = 82.5 kΩ 400 500 600 kHz Switching frequency range using CLK 300 2000 kHz mode Minimum CLK pulse width 75 ns RT/CLK voltage R(RT/CLK) = 82.5 kΩ 0.5 V RT/CLK high threshold 1.6 2.2 V RT/CLK low threshold 0.4 0.6 V RT/CLK falling edge to PH rising edge Measure at 500 kHz with RT resistor in series 55 ns delay PLL lock in time Measure at 500 kHz 40 µs Copyright © 2012–2015, Texas Instruments Incorporated Submit Documentation Feedback 5 Product Folder Links: TPS54678 |
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