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TPS54540QDDARQ1 Datasheet(PDF) 5 Page - Texas Instruments |
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TPS54540QDDARQ1 Datasheet(HTML) 5 Page - Texas Instruments |
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5 / 44 page  TPS54540-Q1 www.ti.com SLVSC56B – SEPTEMBER 2013 – REVISED NOVEMBER 2015 6.5 Electrical Characteristics TJ = –40°C to 150°C, VIN = 4.5 V to 42 V (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT SUPPLY VOLTAGE (VIN PIN) Operating input voltage 4.5 42 V Internal undervoltage lockout threshold Rising 4.1 4.3 4.48 V Internal undervoltage lockout threshold hysteresis 325 mV Shutdown supply current EN = 0 V, 25°C, 4.5 V ≤ VIN ≤ 42 V 2.25 4.5 μA Operating: nonswitching supply current FB = 0.9 V, TA = 25°C 146 175 ENABLE AND UVLO (EN PIN) Enable threshold voltage No voltage hysteresis, rising and falling 1.1 1.2 1.3 V Enable threshold 50 mV –4.6 Input current μA Enable threshold –50 mV –0.58 –1.2 –1.8 Hysteresis current –2.2 –3.4 –4.5 μA INTERNAL SOFT-START TIME Soft-start time fSW = 500 kHz, 10% to 90% 2.1 ms Soft-start time fSW = 2.5 MHz, 10% to 90% 0.42 ms VOLTAGE REFERENCE Voltage reference 0.792 0.8 0.808 V HIGH-SIDE MOSFET On-resistance VIN = 12 V, BOOT-SW = 6 V 92 190 m Ω ERROR AMPLIFIER Input current 50 nA Error amplifier transconductance (gM) –2 μA < ICOMP < 2 μA, VCOMP = 1 V 350 μS Error amplifier transconductance (gM) during soft-start –2 μA < ICOMP < 2 μA, VCOMP = 1 V, VFB = 0.4 V 77 μS Error amplifier DC gain VFB = 0.8 V 10000 V/V Minimum unity gain bandwidth 2500 kHz Error amplifier source and sink V(COMP) = 1 V, 100-mV overdrive ±30 μA COMP to SW current transconductance 17 A/V CURRENT LIMIT All VIN and temperatures, Open Loop(1) 6.3 7.5 8.8 Current limit threshold All temperatures, VIN = 12 V, Open Loop (1) 6.3 7.5 8.3 A VIN = 12 V, TA = 25°C, Open Loop (1) 7.1 7.5 7.9 THERMAL SHUTDOWN Thermal shutdown 176 °C Thermal shutdown hysteresis 12 °C ERROR AMPLIFIER Enable to COMP active VIN = 12 V, TA = 25°C 540 µs (1) Open-loop current limit measured directly at the SW pin and is independent of the inductor value and slope compensation. 6.6 Timing Requirements TJ = –40°C to 150°C, VIN = 4.5 V to 42 V (unless otherwise noted) MIN NOM MAX UNIT RT/CLK Minimum CLK input pulse width 15 ns Copyright © 2013–2015, Texas Instruments Incorporated Submit Documentation Feedback 5 Product Folder Links: TPS54540-Q1 |
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