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LM2673 Datasheet(PDF) 4 Page - National Semiconductor (TI) |
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LM2673 Datasheet(HTML) 4 Page - National Semiconductor (TI) |
4 / 26 page All Output Voltage Versions Electrical Characteristics Limits appearing in bold type face apply over the entire junction temperature range of operation, −40˚C to 125˚C. Specifica- tions appearing in normal type apply for T A =TJ = 25˚C. Unless otherwise specified, RADJ = 8.2K Ω,V IN=12V for the 3.3V, 5V and Adjustable versions and V IN=24V for the 12V version. Symbol Parameter Conditions Typ Min Max Units DEVICE PARAMETERS I Q Quiescent Current V FEEDBACK = 8V 4.2 6 mA For 3.3V, 5.0V, and ADJ Versions V FEEDBACK = 15V For 12V Versions V ADJ Current Limit Adjust Voltage 1.21 1.181/1.169 1.229/1.246 V I CL Current Limit R ADJ = 8.2K Ω, (Note 5) 4.5 3.8/3.6 5.25/5.4 A I L Output Leakage Current V IN = 40V, Softstart Pin = 0V V SWITCH =0V V SWITCH = −1V 1.0 6 1.5 15 mA mA R DS(ON) Switch On-Resistance I SWITCH = 3A 0.15 0.17/0.29 Ω f O Oscillator Frequency Measured at Switch Pin 260 225 280 kHz D Duty Cycle Maximum Duty Cycle 91 % Minimum Duty Cycle 0 % I BIAS Feedback Bias Current V FEEDBACK = 1.3V ADJ Version Only 85 nA V SFST Softstart Threshold Voltage 0.63 0.53 0.74 V I SFST Softstart Pin Current Softstart Pin = 0V 3.7 6.9 µA θ JA Thermal Resistance T Package, Junction to Ambient 65 (Note 6) θ JA T Package, Junction to Ambient 45 (Note 7) θ JC T Package, Junction to Case 2 θ JA S Package, Junction to Ambient 56 ˚C/W (Note 8) θ JA S Package, Junction to Ambient 35 (Note 9) θ JA S Package, Junction to Ambient 26 (Note 10) θ JC S Package, Junction to Case 2 ++ θ JA SD Package, Junction to Ambient 55 ˚C/W (Note 11) θ JA SD Package, Junction to Ambient 29 (Note 12) www.national.com 4 |
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