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TPS40021 Datasheet(PDF) 4 Page - Texas Instruments |
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TPS40021 Datasheet(HTML) 4 Page - Texas Instruments |
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4 / 32 page  TPS40020 TPS40021 SLUS535C − MARCH 2003 − REVISED SEPTEMBER 2004 www.ti.com 4 ELECTRICAL CHARACTERISTICS TJ = −40°C to 85°C, TJ = TA, VDD = 5.0 V (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT INPUT SUPPLY VDD Input voltage range, VDD 2.25 5.50 V VPVDD PVDD pin voltage VDD = 3.3 V 4.9 5.2 V Switching current 500 kHz, No load on HDRV, LDRV 3.5 5.0 IDD Quiescent current FB = 0.8 V 2.0 3.0 mA IDD Shutdown current SS/SD = 0 V, Outputs OFF 0.38 1.00 mA VUVLO Minimum on-voltage 1.95 2.05 2.15 V VUVLO Hysteresis 80 130 200 mV OSCILLATOR fOSC Accuracy 2.25 V ≤ VDD ≤ 5.00 V, RT = 69.8 kΩ 425 500 575 kHz fOSC Accuracy 2.25 V ≤ VDD ≤ 5.00 V, RT = 34.8 kΩ 800 950 1100 kHz VRAMP Ramp voltage VPEAK−VVAL 0.80 0.93 1.07 V VVAL Ramp valley voltage 0.24 0.31 0.41 V PWM dMAX Maximum duty cycle VOSNS = VDD, RT = 34.8 kΩ, VDD = 3.3 V, FB = 0 V 85% 94% dMAX Maximum duty cycle VOSNS = VDD, RT = 70 kΩ, VDD = 5.0 V, FB = 0 V 90% 95% dMIN Minimum duty cycle 0% tMIN Minimum HDRV on-time(2) 250 ns ERROR AMPLIFIER VFB Feedback input voltage −40 °C ≤ TA ≤ 85°C, 2.25V ≤ VDD ≤ 5.00V 0.685 0.690 0.697 V IBIAS Input bias current 30 130 nA VOH High-level output voltage IOH = 0.5 mA, VFB = GND 2.0 2.5 V VOL Low-level output voltage IOL = 0.5 mA, VFB = VDD 0.08 0.15 V IOH High-level output source current VFB = GND 3 7 mA IOL Low-level output sink current VFB = VDD 3 8 mA GBW Gain bandwidth(1) 5 10 MHz AOL Open loop gain(1) 55 85 dB CURRENT LIMIT ISINK Current limit sink current 2.25 V ≤ VDD ≤ 5.00 V, RT = 69.8 kΩ 165 190 215 µA VOS Current limit offset voltage −20 0 20 mV tON Minimum HDRV on−time in overcurrent VDD = 3.3 V 200 300 ns tON Switch leading-edge blanking pulse time(1) 140 ns tSS Soft-start cycles 6 cycles VILIM Current limit input voltage range 2 VDD V SOFT START ISS Soft-start source current Outputs = OFF 2.0 3.3 5.4 µA (1) Ensured by design. Not production tested. (2) Operation below the minimum on-time could result in overlap of the HDRV and LDRV outputs. |
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