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TPS54974PWP 데이터시트(PDF) 3 Page - Texas Instruments |
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TPS54974PWP 데이터시트(HTML) 3 Page - Texas Instruments |
3 / 18 page www.ti.com ELECTRICAL CHARACTERISTICS TPS54974 SLVS458B – JANUARY 2003 – REVISED FEBRUARY 2005 T J = –40°C to 125°C, VIN = 3 V to 4 V, PVIN = 2.2 V to 2.8 V (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT SUPPLY VOLTAGE, VIN Input voltage range, VIN 3.0 4.0 V Supply voltage range, PVIN Output = 1.8 V 2.2 2.5 4.0 V fs = 350 kHz, RT open, PH pin open, PVIN = 2.5 V 6.3 10.0 VIN mA SHUTDOWN, SS/ENA = 0 V, PVIN = 2.5 V 1 1.4 I(Q) Quiescent current fs = 350 kHz, RT open, PH pin open, VIN = 3.3 V 4.0 7.0 mA PVIN SHUTDOWN, SS/ENA = 0 V, VIN = 3.3 V <100 µA UNDER VOLTAGE LOCKOUT (VIN) Start threshold voltage, UVLO 2.95 3.0 V Stop threshold voltage, UVLO 2.70 2.80 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 0.88 Vref Accuracy 0.891 0.900 V 2 REGULATION Line regulation(1)(3) IL = 4.5 A, fs = 350 kHz, TJ = 85°C 0.07 %/V Load regulation(1)(3) IL = 0 A to 9 A, fs = 350 kHz, TJ = 85°C 0.03 %/A OSCILLATOR Internally set—free-running frequency RT open(1) 280 350 420 kHz RT = 180 k Ω (1% resistor to AGND)(1) 252 280 308 Externally set—free-running frequency range RT = 100 k Ω (1% resistor to AGND) 460 500 540 kHz RT = 68 k Ω (1% resistor to AGND)(1) 663 700 762 Ramp valley(1) 0.75 V Ramp amplitude (peak-to-peak)(1) 1 V Minimum controllable on time(1) 200 ns Maximum duty cycle(1) 90% (1) Specified by design (2) Static resistive loads only (3) Specified by the circuit used in Figure 10. 3 |
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