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TPS54873PWPR Datasheet(PDF) 3 Page - Texas Instruments |
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TPS54873PWPR Datasheet(HTML) 3 Page - Texas Instruments |
3 / 10 page TPS54873 SLVS444A − OCTOBER 2002 − REVISED FEBRUARY 2005 www.ti.com 3 ELECTRICAL CHARACTERISTICS TJ = −40°C to 125°C, VI = 3 V to 6 V (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT SUPPLY VOLTAGE, VIN Input voltage range, VIN 4.0 6.0 V fs = 350 kHz, SYNC ≤ 0.8 V, RT open, PH pin open 11 15.8 I(Q) Quiescent current fs = 550 kHz, SYNC ≥ 2.5 V, RT open, PH pin open 16 23.5 mA Shutdown, SS/ENA = 0 V 1 1.4 UNDER VOLTAGE LOCK OUT Start threshold voltage, UVLO 3.8 3.85 V Stop threshold voltage, UVLO 3.40 3.50 V Hysteresis voltage, UVLO 0.14 0.16 V Rising and falling edge deglitch, UVLO(1) 2.5 µs BIAS VOLTAGE Output voltage, VBIAS I(VBIAS) = 0 2.70 2.80 2.90 V Output current, VBIAS (2) 100 µA CUMULATIVE REFERENCE Vref Accuracy 0.882 0.891 0.900 V REGULATION Line regulation(1)(3) IL = 3 A, fs = 350 kHz, TJ = 85°C 0.04 %/V Line regulation(1)(3) IL = 3 A, fs = 550 kHz, TJ = 85°C 0.04 %/V Load regulation(1)(3) IL = 0 A to 6 A, fs = 350 kHz, TJ = 85°C 0.03 %/A Load regulation(1)(3) IL = 0 A to 6 A, fs = 550 kHz, TJ = 85°C 0.03 %/A OSCILLATOR Internally set free running frequency SYNC ≤ 0.8 V, RT open 280 350 420 kHz Internally set—free running frequency SYNC ≥ 2.5 V, RT open 440 550 660 kHz RT = 180 kΩ (1% resistor to AGND) 252 280 308 Externally set—free running frequency range RT = 100 kΩ (1% resistor to AGND) 460 500 540 kHz Externally set free running frequency range RT = 68 kΩ (1% resistor to AGND) 663 700 762 kHz High level threshold, SYNC 2.5 V Low level threshold, SYNC 0.8 V Pulse duration, external synchronization, SYNC(1) 50 ns Frequency range, SYNC(1) 330 700 kHz Ramp valley(1) 0.75 V Ramp amplitude (peak-to-peak)(1) 1 V Minimum controllable on time(1) 200 ns Maximum duty cycle 90% (1) Specified by design (2) Static resistive loads only (3) Specified by the circuit used in Figure 9 |
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