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TPS65281RGVT Datasheet(PDF) 8 Page - Texas Instruments |
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TPS65281RGVT Datasheet(HTML) 8 Page - Texas Instruments |
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8 / 31 page  TPS65281, TPS65281-1 SLVSBH7B – JULY 2012 – REVISED DECEMBER 2012 www.ti.com ELECTRICAL CHARACTERISTICS TJ = 25°C, VIN = 12 V, fSW = 600 kHz, RnFAULT = 100 kΩ (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT INPUT SUPPLY VIN Input voltage range 4.5 18 V IDDSDN Shutdown supply current EN = EN_SW = low 7 20 µA Switching quiescent current with no load at EN = high, EN_SW = low, FB = 6 V IDDQ_NSW 0.8 mA DCDC output With Buck not switching Switching quiescent current with no load at EN = high, EN_SW = low, FB = 5 V IDDQ_SW 13 mA DCDC output, Buck switching With Buck switching Rising VIN 4.10 4.30 4.50 UVLO VIN under voltage lockout Falling VIN 3.85 4.10 4.35 V Hysteresis 0.2 V7V load current = 0 A, V7V Internal biasing supply 6.17 6.32 6.47 V VIN = 12 V OSCILLATOR fSW_BK Switching frequency range Set by external resistor ROSC 300 1400 kHz ROSC = 51 k Ω 510 ROSC = 140 k Ω 1400 fSW Programmable frequency kHz ROSC floating or connected to V7V 600 ROSC connected to ground 270 BUCK CONVERTER VCOMP = 1.2 V, TJ = 25°C 0.792 0.8 0.808 VFB Feedback voltage V VCOMP = 1.2 V, TJ = -40°C to 125°C 0.784 0.8 0.816 VLINEREG Line regulation - DC IOUT = 2 A 0.5 %/V VLOADREG Load regulation - DC IOUT = 0.3 A - 2.7 A 0.5 %/A Gm_EA Error amplifier trans-conductance(1) -2 µA < ICOMP < 2 µA 500 µs Gm_SRC COMP voltage to inductor current Gm(1) ILX = 0.5 A 20 A/V VENH EN high level input voltage 2 V VENL EN low level input voltage 0.4 V ISS Soft-start charging current 4.7 µA tSS_INT Internal soft-start time SS pin open 0.5 1 1.5 ms ILIMIT Buck peak inductor current limit 4 A Rdson_HS On resistance of high side FET in buck V7V = 6.3 V, with bond wire resistance 90 m Ω Rdson_LS On resistance of low side FET in buck VIN = 12 V, with bond wire resistance 70 m Ω POWER DISTRIBUTION SWITCH VSW_IN Power switch input voltage range 2.5 6 V VSW_IN rising 2.15 2.25 2.35 V VUVLO_SW Input under-voltage lock out VSW_IN falling 2.08 2.13 2.28 V Hysteresis 120 mV VSW_IN = 5 V, ISW_OUT = 0.5 A, including bond 100 wire resistance RDSON_SW Power switch NDMOS on-resistance m Ω VSW_IN = 2.5 V, ISW_OUT = 0.5 A, includes bond 100 wire resistance tD_on Turn-on delay time from EN_SW turns high 1.4 2 ms tD_off Turn-off delay time from EN_SW turns low 1.2 2 ms VSW_IN = 5 V, CL = 22 µF, RL = 100 Ω (see Figure 3) tr Output rise time 1.3 1.5 ms tf Output fall time 5 10 ms RLIM = 14.3 kΩ 1.65 1.76 1.87 Current limit threshold (maximum DC current RLIM = 20 kΩ 1.18 1.26 1.34 IOS delivered to load) and short circuit current, A RLIM = 50 kΩ 0.47 0.5 0.53 SW_OUT connect to ground RLIM shorted to SW_IN or open 1.12 1.2 1.28 tIOS Response time to short circuit VSW_IN = 5 V 2 us (1) Specified by design. 8 Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated Product Folder Links: TPS65281 TPS65281-1 |
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