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TPS54320 Datasheet(PDF) 4 Page - Texas Instruments |
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TPS54320 Datasheet(HTML) 4 Page - Texas Instruments |
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4 / 39 page  TPS54320 SLVS982A – AUGUST 2010 – REVISED SEPTEMBER 2010 www.ti.com ELECTRICAL CHARACTERISTICS (continued) TJ= –40°C to 150°C, VIN = 4.5V to 17V, PVIN = 1.6V to 17V (unless otherwise noted) DESCRIPTION CONDITIONS MIN TYP MAX UNIT ERROR AMPLIFIER Error amplifier Transconductance (gm) –2 mA < I(COMP) < 2 mA, V(COMP) = 1 V 1300 mMhos Error amplifier dc gain VSENSE = 0.8 V 1000 3100 V/V Error amplifier source/sink V(COMP) = 1 V, 100 mV input overdrive ±110 mA Start switching threshold 0.25 V COMP to Iswitch gm 12 A/V CURRENT LIMIT High-side switch current limit threshold 4.2 6.2 A Low-side switch sourcing current limit 3.8 5.8 A Low-side switch sinking current limit 1 2.6 A Hiccup wait time before triggering hiccup 512 cycles Hiccup time before restart 16384 cycles THERMAL SHUTDOWN Thermal shutdown 160 175 °C Thermal shutdown hysteresis 10 °C TIMING RESISTOR AND EXTERNAL CLOCK (RT/CLK PIN) Minimum switching frequency Rrt = 240 k Ω (1%) 160 200 240 kHz Switching frequency Rrt = 100 k Ω (1%) 400 480 560 kHz Maximum switching frequency Rrt = 40.2 k Ω (1%) 1080 1200 1320 kHz Minimum pulse width 20 ns RT/CLK high threshold 2 V RT/CLK low threshold 0.8 V RT/CLK falling edge to PH rising edge delay Measure at 500 kHz with RT resistor in series 62 ns Switching frequency range (RT mode set point 200 1200 kHz and PLL mode) PH (PH PIN) Measured at 90% to 90% of PH, Minimum on time 97 135 ns TA = 25°C, IPH = 2A Minimum off time BOOT-PH ≥ 3 V 0 ns BOOT (BOOT PIN) BOOT-PH UVLO 2.1 3 V SLOW START AND TRACKING (SS/TR PIN) SS charge current 2.3 mA SS/TR to VSENSE matching V(SS/TR) = 0.4 V 29 60 mV POWER GOOD (PWRGD PIN) VSENSE falling (Fault) 91 % Vref VSENSE rising (Good) 94 % Vref VSENSE threshold VSENSE rising (Fault) 109 % Vref VSENSE falling (Good) 106 % Vref Output high leakage VSENSE = Vref, V(PWRGD) = 5.5 V 30 100 nA Output low I(PWRGD) = 2 mA 0.3 V Minimum VIN for valid output V(PWRGD) < 0.5V at 100 mA 0.6 1 V Minimum SS/TR voltage for PWRGD valid 1.2 1.4 V 4 Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s) :TPS54320 |
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