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LM2675EP Datasheet(PDF) 4 Page - National Semiconductor (TI) |
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LM2675EP Datasheet(HTML) 4 Page - National Semiconductor (TI) |
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4 / 25 page  LM2675-ADJEP (Continued) Symbol Parameter Conditions Typ Min Max Units (Note 7) (Note 8) (Note 8) η Efficiency V IN = 12V, ILOAD =1A 90 % All Output Voltage Versions Specifications with standard type face are for T J = 25˚C, and those with bold type face apply over full Operating Tempera- ture Range. Unless otherwise specified, V IN = 12V for the 3.3V, 5V, and Adjustable versions and VIN = 24V for the 12V ver- sion, and I LOAD = 100 mA. Symbol Parameters Conditions Typ Min Max Units DEVICE PARAMETERS I Q Quiescent Current V FEEDBACK = 8V 2.5 3.6 mA For 3.3V, 5.0V, and ADJ Versions V FEEDBACK = 15V 2.5 mA For 12V Versions I STBY Standby Quiescent Current ON/OFF Pin = 0V 50 100/150 µA I CL Current Limit 1.55 1.25/1.2 2.1/2.2 A I L Output Leakage Current V IN = 40V, ON/OFF Pin = 0V V SWITCH =0V 125 µA V SWITCH = −1V, ON/OFF Pin = 0V 615 mA R DS(ON) Switch On-Resistance I SWITCH = 1A 0.25 0.30/0.50 Ω f O Oscillator Frequency Measured at Switch Pin 260 225 275 kHz D Maximum Duty Cycle 95 % Minimum Duty Cycle 0 % I BIAS Feedback Bias Current V FEEDBACK = 1.3V ADJ Version Only 85 nA V S/D ON/OFF Pin Voltage Thesholds 1.4 0.8 2.0 V I S/D ON/OFF Pin Current ON/OFF Pin = 0V 20 737 µA θ JA Thermal Resistance N Package, Junction to Ambient (Note 9) 95 ˚C/W M Package, Junction to Ambient (Note 9) 105 Note 4: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is intended to be functional, but device parameter specifications may not be guaranteed under these conditions. For guaranteed specifications and test conditions, see the Electrical Characteristics. Note 5: The human body model is a 100 pF capacitor discharged through a 1.5 k Ω resistor into each pin. Note 6: External components such as the catch diode, inductor, input and output capacitors, and voltage programming resistors can affect switching regulator performance. When the LM2675EP is used as shown in Figures 2, 3 test circuits, system performance will be as specified by the system parameters section of the Electrical Characteristics. Note 7: Typical numbers are at 25˚C and represent the most likely norm. Note 8: All limits guaranteed at room temperature (standard type face) and at temperature extremes (bold type face). All room temperature limits are 100% production 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). Note 9: Junction to ambient thermal resistance with approximately 1 square inch of printed circuit board copper surrounding the leads. Additional copper area will lower thermal resistance further. See Application Information section in the application note accompanying this datasheet and the thermal model in LM267X Made Simple software (version 6.0). The value θJ−A for the LLP (LD) package is specifically dependent on PCB trace area, trace material, and the number of layers and thermal vias. For improved thermal resistance and power dissipation for the LLP package, refer to Application Note AN-1187. www.national.com 4 |
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