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LM3485EVAL Datasheet(PDF) 3 Page - Texas Instruments |
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LM3485EVAL Datasheet(HTML) 3 Page - Texas Instruments |
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3 / 22 page  LM3485 www.ti.com SNVS178F – MAY 2004 – REVISED SEPTEMBER 2009 Electrical Characteristics Specifications in Standard type face are for TJ = 25°C, and in bold type face apply over the full Operating Temperature Range (TJ = −40°C to +125°C). Unless otherwise specified, VIN = 12V, VISNS = VIN − 1V, and VADJ = VIN − 1.1V. Datasheet min/max specification limits are guaranteed by design, test, or statistical analysis. Min Typ Max Symbol Parameter Conditions Unit (1) (2) (1) IQ Quiescent Current at ground FB = 1.5V 250 400 µA pin (Not Switching) VFB Feedback Voltage 1.226 1.242 1.258 V (3) 1.217 1.267 VHYST Comparator Hysteresis 10 15 mV 14 20 VCL (4) Current limit comparator trip RADJ = 20kΩ 110 mV voltage RADJ = 160kΩ 880 VCL_OFFSET Current limit comparator VFB = 1.5V −20 0 +20 mV offset ICL_ADJ Current limit ADJ current VFB = 1.5V 3.0 5.5 7.0 µA source TCL Current limit one shot off VADJ = 11.5V 6 9 14 µs time VISNS = 11.0V VFB = 1.0V RPGATE Driver resistance Source 5.5 Ω ISOURCE = 100mA Sink 8.5 ISink = 100mA IPGATE Driver Output current Source 0.44 A VIN = 7V, PGATE = 3.5V Sink 0.32 VIN = 7V, PGATE = 3.5V IFB FB pin Bias Current VFB = 1.0V 300 750 nA (5) TONMIN_NOR Minimum on time in normal VISNS = VADJ+0.1V Cload on 100 ns operation OUT = 1000pF (6) TONMIN_CL Minimum on time in current VISNS = VADJ+0.1V 175 ns limit VFB = 1.0V Cload on OUT = 1000pF (6) %VFB/ΔVIN Feedback Voltage Line 4.5 ≤ VIN ≤ 35V 0.010 %/V Regulation (1) All limits are guaranteed at room temperature (standard type face) and at temperature extremes (bold type face). All room temperature limits are 100% tested. All limits at temperature extremes are guaranteed via correlation using standard Statistical Quality Control (SQC) methods. All limits are used to calculate Average Outgoing Quality Level (AOQL). (2) Typical numbers are at 25°C and represent the most likely norm. (3) The VFB is the trip voltage at the FB pin when PGATE switches from high to low. (4) VCL = ICL_ADJ * RADJ (5) Bias current flows out from the FB pin. (6) A 1000pF capacitor is connected between VIN and PGATE. Copyright © 2004–2009, Texas Instruments Incorporated Submit Documentation Feedback 3 Product Folder Links: LM3485 |
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