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TPS40042DRCTG4 Datasheet(PDF) 4 Page - Texas Instruments |
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TPS40042DRCTG4 Datasheet(HTML) 4 Page - Texas Instruments |
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4 / 36 page  www.ti.com ELECTRICAL CHARACTERISTICS TPS40042 SLUS777 – NOVEMBER 2007 TJ = -40 °C to 85°C VVDD = 5 V, (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT INPUT SUPPLY VVDD Input voltage range(1) 3.0 5.5 V IDDsd Shutdown VEN = VVDD 100 180 µA IDDq Quiescent VFB = 0.8 V 1.0 2.0 mA IDDs Switching current No load at HDRV/LDRV 3.0 UVLOON Minimum turn-on voltage 1.90 2.05 2.2 V UVLOHYS Hysteresis 80 130 200 mV OSCILLATOR/ RAMP GENERATOR fPWM PWM frequency 3.0 V < VVDD < 5.5 V 500 600 700 kHz fPWM PWM frequency VVDD = 5.0 V, 0°C < TJ < 70°C 540 600 660 kHz VRAMP Ramp amplitude PP VPEAK – VVALLEY 0.75 0.87 1.0 V VVALLEY Ramp valley voltage 0.4 V PWM MAXDUTY Maximum duty cycle, VFB = 0 V, 3.0 V < VVDD < 5.5 V 88% 95% MINDUTY Minimum duty cycle 0% MIN pulse Minimum width control range before Minimum controllable pulse width 90 150 ns width (2) jumping to zero. ERROR AMPLIFIER VOS FB to REFIN offset voltage 0.5 V < VREFIN < 1.5 V -5 0 5 mV IFB FB, REFIN input bias current -30 -125 nA IOH = 0.5 mA, VFB = 0 V, VVDD = 5.5 VOH High level output voltage 2.0 2.5 V V VOL Low level output voltage IOL = 0.5 mA, VFB = VVDD 80 150 mV IOH Output source current VCOMP = 0.7 V, VFB = GND 1 6 mA IOL Output sink current VCOMP = 0.7 V, VFB = VVDD 2 8 GBW (2) Gain bandwidth 5 10 MHz AOL Open loop gain 55 85 dB SHORT CIRCUIT PROTECTION Resistor COMP to GND = 2.4 k Ω, TJ TH1 Low short circuit threshold voltage 80 105 130 = 25 °C Medium short circuit threshold Default: No resistor COMP to GND, VTH2 140 175 210 mV voltage TJ = 25°C Resistor COMP to GND = 12 k Ω, TJ VTH3 High short circuit threshold voltage 250 310 370 = 25 °C VTH(tc) (2) Threshold temperature coefficient 3100 ppm Minimum HDRV pulse time in over tON(oc) (2) 190 current ns tSWOCblank SW leading edge blanking pulse in 100 (2) over current detection tHICCUP Hiccup time between restarts 40 ms (1) VVDD operation to 2.25 V is possible with some degradation in specifications. Under this condition, the VREFIN range is limited to 0.5 V to 0.7 V. (2) Ensured by design. Not production tested. 4 Copyright © 2007, Texas Instruments Incorporated Product Folder Link(s): TPS40042 |
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