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LM3481MM Datenblatt(PDF) 4 Page - Texas Instruments |
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LM3481MM Datenblatt(HTML) 4 Page - Texas Instruments |
4 / 30 page LM3481 SNVS346E – NOVEMBER 2007 – REVISED APRIL 2012 www.ti.com ELECTRICAL CHARACTERISTICS (continued) VIN=12V, RFA=40 kΩ unless otherwise indicated under the Conditions column. Typicals and limits appearing in plain type apply for TJ = 25°C. Limits appearing in boldfacetype apply over the full Operating Temperature Range (-40°C to 125°C). Datasheet min/max specification limits are guaranteed by design, test, or statistical analysis. (1) (2) Symbol Parameter Conditions Min Typ Max Units RDS1 (ON) Driver Switch On Resistance (top) IDR = 0.2A, VIN= 5V 4 Ω RDS2 (ON) Driver Switch On Resistance (bottom) IDR = 0.2A 2 Ω VIN < 6V VIN VDR (max) Maximum Drive Voltage Swing(3) V VIN ≥ 6V 6 Dmax Maximum Duty Cycle 85 % tmin (on) Minimum On Time 250 ns ISUPPLY Supply Current (switching) See (4) 3.7 5.0 mA VFA/SYNC/SD = 3V (5), V IN = 12V 9 15 IQ Quiescent Current in Shutdown Mode µA VFA/SYNC/SD = 3V (5), V IN = 5V 5 10 VSENSE Current Sense Threshold Voltage 100 160 190 mV VSC Over Load Current Limit Sense Voltage 157 220 275 mV VSL Internal Compensation Ramp Voltage 90 mV Output Over-voltage Protection (with VOVP VCOMP = 1.4V 26 85 135 mV respect to feedback voltage) (6) Output Over-Voltage Protection VOVP(HYS) VCOMP = 1.4V 28 70 106 mV Hysteresis Gm Error Amplifier Transconductance VCOMP = 1.4V 216 450 690 µmho VCOMP = 1.4V AVOL Error Amplifier Voltage Gain 35 60 66 V/V IEAO = 100 µA (Source/Sink) Source, VCOMP = 1.4V, VFB = 1.1V 475 640 837 µA Error Amplifier Output Current (Source/ IEAO Sink) Sink, VCOMP = 1.4V, VFB = 1.4V 31 65 100 µA Upper Limit, VFB = 0V, COMP Pin 2.45 2.70 2.93 V Floating VEAO Error Amplifier Output Voltage Swing Lower Limit, VFB = 1.4V 0.32 0.60 0.90 V tSS Internal Soft-Start Delay VFB = 1.2V, COMP Pin Floating 15 ms tr Drive Pin Rise Time Cgs = 3000 pf, VDR = 0V to 3V 25 ns tf Drive Pin Fall Time Cgs = 3000 pf, VDR = 3V to 0V 25 ns Output = High (Shutdown) 1.31 1.40 V Shutdown signal threshold (7) VSD FA/SYNC/SD pin Output = Low (Enable) 0.40 0.68 V VSD = 5V −1 ISD Shutdown Pin Current FA/SYNC/SD pin µA VSD = 0V 20 TSD Thermal Shutdown 165 °C Tsh Thermal Shutdown Hysteresis 10 °C θJA Thermal Resistance DGS Package 200 °C/W (3) The drive pin voltage, VDR, is equal to the input voltage when input voltage is less than 6V. VDR is equal to 6V when the input voltage is greater than or equal to 6V. (4) For this test, the FA/SYNC/SD Pin is pulled to ground using a 40 k Ω resistor . (5) For this test, the FA/SYNC/SD Pin is pulled to 3V using a 40 k Ω resistor. (6) The over-voltage protection is specified with respect to the feedback voltage. This is because the over-voltage protection tracks the feedback voltage. The over-voltage threshold can be calculated by adding the feedback voltage (VFB) to the over-voltage protection specification. (7) The FA/SYNC/SD pin should be pulled to VIN through a resistor to turn the regulator off. The voltage on the FA/SYNC/SD pin must be above the max limit for the Output = High longer than 30 µs to keep the regulator off and must be below the minimum limit for Output = Low to keep the regulator on. 4 Submit Documentation Feedback Copyright © 2007–2012, Texas Instruments Incorporated Product Folder Links: LM3481 |
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