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LM2679 Datasheet(PDF) 4 Page - National Semiconductor (TI) |
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LM2679 Datasheet(HTML) 4 Page - National Semiconductor (TI) |
4 / 24 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. Specifications 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. 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 = 5.6KΩ, (Note 5) 6.3 5.5/5.3 7.6/8.1 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 = 5A 0.12 0.14/0.225 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 ++ Note 1: Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings indicate conditions under which of the device is guaranteed. Operating Ratings do not imply guaranteed performance limits. For guaranteed performance limits and associated test condition, see the electrical Char- acteristics tables. Note 2: ESD was applied using the human-body model, a 100pF capacitor discharged through a 1.5 k Ω resistor into each pin. Note 3: Typical values are determined with TA =TJ = 25˚C and represent the most likely norm. Note 4: All limits are guaranteed at room temperature (standard type face) and at temperature extremes (bold type face). All room temperature limits are 100% tested during production with TA =TJ = 25˚C. All limits at temperature extremes are guaranteed via correlation using standard standard Quality Control (SQC) meth- ods. All limits are used to calculate Average Outgoing Quality Level (AOQL). Note 5: The peak switch current limit is determined by the following relationship: ICL=37,125/ RADJ. Note 6: Junction to ambient thermal resistance (no external heat sink) for the 7 lead TO-220 package mounted vertically, with 1⁄2 inch leads in a socket, or on a PC board with minimum copper area. Note 7: Junction to ambient thermal resistance (no external heat sink) for the 7 lead TO-220 package mounted vertically, with 1⁄2 inch leads soldered to a PC board containing approximately 4 square inches of (1 oz.) copper area surrounding the leads. www.national.com 4 |
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