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TPS65251-1 Datasheet(PDF) 7 Page - Texas Instruments |
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TPS65251-1 Datasheet(HTML) 7 Page - Texas Instruments |
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7 / 39 page  TPS65251-1, TPS65251-2, TPS65251-3 www.ti.com SLVSC70A – JANUARY 2015 – REVISED JANUARY 2015 Electrical Characteristics (continued) TJ = –40°C to 125°C, VIN = 12 V, ƒSW = 500 Hz (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT FEEDBACK, REGULATION, OUTPUT STAGE VIN = 12 V, TJ = 25°C –1% 0.8 1% VFB Feedback voltage V VIN = 4.5 to 18 V –2% 0.8 2% IFB Feedback leakage current 50 nA Minimum on-time tON_MIN (current sense blanking) to specify output 70 100 ns regulation RLIM1 Limit resistance range VIN = 12 V, ƒSW = 500 kHz 75 300 k Ω RLIM2,3 Limit resistance range VIN = 12 V, ƒSW = 500 kHz 1.1 5.1 A ILIM1 Buck1 current limit range VIN = 12 V, ƒSW = 500 kHz 100 300 k Ω ILIM2 Buck2 current limit range VIN = 12 V, ƒSW = 500 kHz 1.2 4.1 A ILIM3 Buck3 current limit range VIN = 12 V, ƒSW = 500 kHz 1.2 4.1 A MOSFET (BUCK 1) H.S. Switch Turn-on resistance high-side FET on CH1 BOOT = 6.5 V, TJ = 25°C 95 m Ω L.S. Switch Turn-on resistance low-side FET on CH1 VIN = 12 V, TJ = 25°C 50 m Ω MOSFET (BUCK 2) H.S. Switch Turn-on resistance high-side FET on CH2 BOOT = 6.5 V, TJ = 25°C 120 m Ω L.S. Switch Turn-on resistance low-side FET on CH2 VIN = 12 V, TJ = 25°C 80 m Ω MOSFET (BUCK 3) H.S. Switch Turn-on resistance high-side FET on CH3 BOOT = 6.5 V, TJ = 25°C 120 m Ω L.S. Switch Turn-on resistance low-side FET on CH3 VIN = 12 V, TJ = 25°C 80 m Ω ERROR AMPLIFIER gM Error amplifier transconductance –2 µA < ICOMP < 2 µA 130 µmhos gmPS COMP to ILX gM ILX = 0.5 A 10 A/V POWER GOOD RESET GENERATOR Output falling 85% VUVBUCKX Threshold voltage for buck under voltage Output rising (PG is asserted) 90% tUV_deglitch Deglitch time (both edges) Each buck 11 ms tON_HICCUP Hiccup mode ON time VUVBUCKX asserted 13 ms All converters disabled. After tOFF_HICCUP tOFF_HICCUP Hiccup mode OFF time elapses, all converters go through 11 ms sequencing again. Output rising (high-side FET is forced 106% off) VOVBUCKX Threshold voltage for buck over voltage Output falling (high-side FET is allowed 104% to switch) TPS65251-1 1000 tRP Minimum reset period TPS65251-2 32 ms TPS65251-3 256 THERMAL SHUTDOWN TTRIP Thermal shutdown trip point Rising temperature 160 °C THYST Thermal shutdown hysteresis Device restarts 20 °C tTRIP_DEGLITCH Thermal shutdown deglitch 100 120 µs Copyright © 2015, Texas Instruments Incorporated Submit Documentation Feedback 7 Product Folder Links: TPS65251-1 TPS65251-2 TPS65251-3 |
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