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TPS54540 Datasheet(PDF) 5 Page - Texas Instruments |
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TPS54540 Datasheet(HTML) 5 Page - Texas Instruments |
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5 / 38 page  TPS54540 www.ti.com SLVSBX7 – MAY 2013 ELECTRICAL CHARACTERISTICS TJ = –40°C to 150°C, VIN = 4.5 to 60V (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 325 mV hysteresis Shutdown supply current EN = 0 V, 25°C, 4.5 V ≤ VIN ≤ 42 V 2.25 4.5 μA Operating: nonswitching supply current FB = 0.83 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 Enable to COMP active VIN = 12 V, TA = 25°C 540 µs 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 μMhos Error amplifier transconductance (gM) during –2 μA < ICOMP < 2 μA, VCOMP = 1 V, VFB = 0.4 V 77 μMhos soft-start Error amplifier dc gain VFB = 0.8 V 10,000 V/V Min unity gain bandwidth 2500 kHz Error amplifier source/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 Current limit threshold delay 60 ns THERMAL SHUTDOWN Thermal shutdown 176 °C Thermal shutdown hysteresis 12 °C TIMING RESISTOR AND EXTERNAL CLOCK (RT/CLK PIN) Switching frequency range using RT mode 100 2500 kHz fSW Switching frequency RT = 200 kΩ 450 500 550 kHz Switching frequency range using CLK mode 160 2300 kHz Minimum CLK input pulse width 15 ns RT/CLK high threshold 1.55 1.7 V RT/CLK low threshold 0.5 1.2 V RT/CLK falling edge to SW rising edge Measured at 500 kHz with RT resistor in series 55 ns delay PLL lock in time Measured at 500 kHz 78 μs (1) Open Loop current limit measured directly at the SW pin and is independent of the inductor value and slope compensation. Copyright © 2013, Texas Instruments Incorporated Submit Documentation Feedback 5 Product Folder Links: TPS54540 |
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