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TPS65258RHAT Datasheet(PDF) 8 Page - Texas Instruments |
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TPS65258RHAT Datasheet(HTML) 8 Page - Texas Instruments |
8 / 32 page TPS65258 SLVSAB31 – SEPTEMBER 2011 www.ti.com ELECTRICAL CHARACTERISTICS TJ = –40°C to 125°C, VIN = 12 V, fSW = 500 kHz (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT INPUT SUPPLY UVLO AND INTERNAL SUPPLY VOLTAGE VIN Input voltage range 4.5 16 V IDDSDN Shutdown EN pin = low for all converters 170 µA Converters enabled, no load Buck1 = 1.2 V Quiescent (push-button pull-up Buck2 = 1.8 V 600 µA current not included) Buck3 = 3.3 V IDDQ TA = 25°C, F_PWM = Low Converters enabled, no load Quiescent, forced PWM 18 mA F_PWM = High Rising VIN 4.22 UVLO VIN under voltage lockout V Falling VIN 4.1 UVLODEGLITCH Both edges 110 µs V3p3 Internal biasing supply 3.3 V V7V Internal biasing supply 6.25 V Rising V7V 3.8 V7VUVLO UVLO for internal V7V rail V Falling V7V 3.6 V7VUVLO_DEGLITCH Falling edge 110 µs BUCK CONVERTERS (ENABLE CIRCUIT, CURRENT LIMIT, SOFT-START AND SWITCHING FREQUENCY) V3p3 = 3.2 V - 3.4 V, 0.66 x VIH_ENx Enable threshold high V VENx rising V3p3 V3p3 = 3.2 V - 3.4 V, 0.33 x VIL_ENx Enable treshold low V VENx falling V3p3 V3p3 = 3.2 V - 3.4 V, 0.66 x VIH_F_PWM Enable threshold high V VENx rising V3p3 V3p3 = 3.2 V - 3.4 V, 0.33 x VIL_F_PWM Enable treshold low V VENx falling V3p3 ICHEN Pull up current enable pin 1 µA tD Discharge time enable pins Power-up 10 ms ISS Soft-start pin current source 5 µA FSW_BK Converter switching frequency range Set externally with resistor 0.3 2.2 MHz RFSW Frequency setting resistor 50 600 k Ω fSW_TOL Internal oscillator accuracy fSW = 800 kHz -10 10 % FEEDBACK, REGULATION, OUTPUT STAGE VIN = 12 V , TA = 25°C -1% 0.8 1% VFB Feedback voltage V VIN = 4.5 V to 16 V -2% 0.8 2% Minimum on time (current sense tON_MIN 135 ns blanking) ILIMIT1 Peak inductor current limit range 0.75 4 A ILIMIT2 Peak inductor current limit range 0.75 3 A ILIMIT3 Peak inductor current limit range 0.75 3 A MOSFET (BUCK 1) On resistance of high side FET on H.S. Switch 25 °C, BOOT = 6.5 V 95 m Ω CH1 On resistance of low side FET on L.S. Switch 25 °C, VIN = 12 V 50 m Ω CH1 MOSFET (BUCK 2) On resistance of high side FET on H.S. Switch 25 °C, BOOT = 6.5 V 120 m Ω CH2 On resistance of low side FET on L.S. Switch 25 °C, VIN = 12 V 80 m Ω CH2 8 Submit Documentation Feedback Copyright © 2011, Texas Instruments Incorporated Product Folder Link(s): TPS65258 |
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