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LMS3655-Q1 Datasheet(PDF) 8 Page - Texas Instruments |
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LMS3655-Q1 Datasheet(HTML) 8 Page - Texas Instruments |
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8 / 52 page  8 LMS3655 SNAS744A – JULY 2017 – REVISED OCTOBER 2017 www.ti.com Product Folder Links: LMS3655 Submit Documentation Feedback Copyright © 2017, Texas Instruments Incorporated Electrical Characteristics (continued) Limits apply over the recommended operating junction temperature range of –40°C to +150°C, unless otherwise noted. Minimum and maximum limits are specified through test, design, or statistical correlation. Typical values represent the most likely parametric norm at TJ = 25°C, and are provided for reference purposes only. Unless otherwise stated the following conditions apply: VIN = 13.5 V. PARAMETER TEST CONDITIONS MIN TYP MAX UNIT IFB Input current from FB to AGND FB = 1 V 20 nA VREF Reference voltage TJ = 25°C 0.993 1 1.007 V TJ = –40°C to 125°C 0.99 1 1.01 RRESET RDSON of RESEToutput Pull FB pin low. Sink 1-mA at RESET pin 50 120 Ω VSYNC VIH 1.5 V VIL 0.4 VHYST 0.15 1 TSD Thermal shutdown thresholds(2) Rising 160 185 °C Hysteresis 15 DMAX Maximum switch duty cycle Fsw = 400 kHz 96% While in dropout(2) 98% 7.7 System Characteristics The following specifications are ensured by design provided that the component values in the typical application circuit are used. These parameters are not ensured by production testing. Limits apply over the recommended operating junction temperature range of –40°C to +150°C, unless otherwise noted. Minimum and maximum limits are specified through test, design, or statistical correlation. Typical values represent the most likely parametric norm at TJ = 25°C, and are provided for reference purposes only. Unless otherwise stated the following conditions apply: VIN = 13.5 V. PARAMETER TEST CONDITIONS MIN TYP MAX UNIT VIN-MIN Minimum input voltage for full functionality at 3.5-A load, after start-up. VOUT = 3.3 V +2% or –3% regulation 3.5 V Minimum input voltage for full functionality at maximum rated load 5.5 A after start-up. VOUT = 3.3 V +2% or –3% regulation 3.8 VOUT Output voltage VIN = VOUT + 1 V to 36 V, IOUT = 3.5 A –2.25% 2.25% FSW Switching frequency VIN = 24 V, FPWM = 24V, VOUT = 3.3 V, IOUT = 200 mA 400 kHz IQ_VIN Input current to VIN pin VIN = 13.5 V, VOUT = 3.3 V, IOUT = 0 A , FPWM = 0, RFBT = 49.9 kΩ, RFBB = 21.7 kΩ 32 µA VIN = 13.5 V, VOUT = 5.0 V, IOUT = 0 A, FPWM = 0, RFBT = 49.9 kΩ, RFBB = 12.4 kΩ 57 IB Bias current in AUTO mode at no load VIN = 13.5 V, IOUT = 0 A, FPWM = 0 32 42 µA VDROP1 Minimum input to output voltage differential to maintain regulation accuracy without inductor DCR drop VOUT = 3.3 V or 5 V, IOUT= 3.5 A, +2% or –3% output accuracy 0.35 0.6 V VOUT = 3.3 V or 5 V, IOUT= 5.5 A, +2% or –3% output accuracy 0.65 0.85 V VDROP2 Minimum input to output voltage differential to maintain FSW ≥ 330 kHz without inductor DCR drop VOUT = 3.3 V or 5 V, IOUT = 3.5 A, FSW = 330 kHz, 2% regulation accuracy 0.5 0.7 V VOUT = 3.3 V or 5 V, IOUT = 5.5 A, FSW = 330 kHz, 2% regulation accuracy 0.7 1.2 V Efficiency Typical efficiency VIN = 13.5 V, VOUT = 5 V, IOUT = 3.5 A 94% VIN = 13.5 V, VOUT = 3.3 V, IOUT = 3.5 A 92% VIN = 13.5 V, VOUT = 5 V, IOUT = 100 mA 92% |
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