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LM2670S-3.3 Datasheet(PDF) 4 Page - National Semiconductor (TI) |
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LM2670S-3.3 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 VIN=12V for the 3.3V, 5V and Adjustable versions and V IN=24V for the 12V version, Sync pin open circuited.. 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 I STBY Standby Quiescent Current ON/OFF Pin = 0V 50 100/150 µA I CL Current Limit 4.5 3.8/3.6 5.25/5.4 A I L Output Leakage Current V IN = 40V, ON/OFF Pin = 0V V SWITCH =0V V SWITCH = −1V 16 200 15 µA 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 ON/OFF ON/OFF Threshold Voltage 1.4 0.8 2.0 V I ON/OFF ON/OFF Input Current ON/OFF Input = 0V 20 45 µA F SYNC Synchronization Frequency V SYNC(Pin 5)=3.5V, 50% Duty Cycle 400 KHz V SYNC SYNC Threshold Voltage 1.4 V θ JA Thermal Resistance T Package, Junction to Ambient 65 (Note 5) θ JA T Package, Junction to Ambient 45 (Note 6) θ JC T Package, Junction to Case 2 θ JA S Package, Junction to Ambient 56 ˚C/W (Note 7) θ JA S Package, Junction to Ambient 35 (Note 8) θ JA S Package, Junction to Ambient 26 (Note 9) θ JC S Package, Junction to Case 2 ++ θ JA SD Package, Junction to Ambient 55 ˚C/W (Note 10) θ JA SD Package, Junction to Ambient 29 (Note 11) www.national.com 4 |
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