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LM2651MTCX-ADJ Scheda tecnica(PDF) 5 Page - National Semiconductor (TI) |
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LM2651MTCX-ADJ Scheda tecnica(HTML) 5 Page - National Semiconductor (TI) |
5 / 10 page All Output Voltage Versions (Continued) Specifications in standard type face are for T J = 25˚C and those with boldface type apply over full operating junction tem- perature range. V IN =10V unless otherwise specified. Symbol Parameter Conditions Typical Limit Units I EA_SOURCE Error Amplifier Source Current 40 25/15 µA µA(min) I EA_SINK Error Amplifier Sink Current 65 30 µA µA(min) V EAH Error Amplifier Output Swing Upper Limit 2.70 2.50/2.40 V V(min) V EAL Error Amplifier Output Swing Lower Limit 1.25 1.35/1.50 V V(max) V D Body Diode Voltage I DIODE = 1.5A 1 V f OSC Oscillator Frequency V IN = 4V 300 280/255 330/345 kHz kHz(min) kHz(max) D MAX Maximum Duty Cycle V IN = 4V 95 92 % %(min) I SS Soft-Start Current Voltage at the SS pin = 1.4V 11 7 14 µA µA(min) µA(max) I SHUTDOWN Shutdown Pin Current Shutdown Pin Pulled Low 2.2 0.8/0.5 3.7/4.0 µA µA(min) µA(max) v SHUTDOWN Shutdown Pin Threshold Voltage Falling Edge 0.6 0.3 0.9 V V(min) V(max) T SD Thermal Shutdown Temperature 165 ˚C T SD_HYST Thermal Shutdown Hysteresis Temperature 25 ˚C Note 1: Absolute maximum ratings indicate limits beyond which damage to the device may occur. Operating ratings indicate conditions for which the device is in- tended 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 2: The maximum allowable power dissipation is calculated by using PDmax = (TJmax −TA)/θJA , where TJmax is the maximum junction temperature, TA is the ambient temperature, and θJA is the junction-to-ambient thermal resistance of the specified package. The 893 mW rating results from using 150˚C, 25˚C, and 140˚C/W for TJmax,TA, and θJA respectively. A θJA of 140˚C/W represents the worst-case condition of no heat sinking of the 16-pin TSSOP package. Heat sinking allows the safe dissipation of more power. The Absolute Maximum power dissipation must be derated by 7.14mW per ˚C above 25˚C ambient. The LM2651 actively limits its junction temperature to about 165˚C. Note 3: The human body model is a 100pF capacitor discharged through a 1.5k Ω resistor into each pin. Note 4: Typical numbers are at 25˚C and represent the most likely norm. Note 5: All limits are guaranteed at room temperature (standard typeface) and at temperature extremes (boldface type ). 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). www.national.com 5 |
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