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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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LM20146 Fiches technique(PDF) 3 Page - Texas Instruments |
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LM20146 Fiches technique(HTML) 3 Page - Texas Instruments |
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3 / 29 page  LM20146 www.ti.com SNVS563B – NOVEMBER 2008 – REVISED FEBRUARY 2009 Absolute Maximum Ratings (1) (2) Voltages from the indicated pins to GND AVIN, PVIN, EN, PGOOD, SS/TRK, COMP, FB, RT -0.3V to +6V Storage Temperature -65°C to 150°C Junction Temperature 150°C Power Dissipation(3) 2.6W Lead Temperature (Soldering, 10 sec) 260°C Minimum ESD Rating(4) ±2kV (1) 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 do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. (2) If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/Distributors for availability and specifications. (3) The maximum allowable power dissipation is a function of the maximum junction temperature, TJ_MAX, the junctions-to-ambient thermal resistance, θJA, and the ambient temperature, TA. The maximum allowable power dissipation at any ambient temperature is calculated using: PD_MAX = (TJ_MAX – TA)/θJA. The maximum power dissipations of 2.6W is determined using TA = 25°C, θJA = 25°C/W, and TJ_MAX = 125°C. The θJA specification of 25°C/W listed in the electrical characteristics table is measured with the part surface mounted to a 2" x 2" FR4 4 layer board. See Figure 36 for more detailed θJA information. (4) The human body model is a 100 pF capacitor discharged through a 1.5 k Ω resistor to each pin. Operating Ratings PVIN, AVIN to GND 2.95V to 5.5V Junction Temperature −40°C to + 125°C Electrical Characteristics Unless otherwise stated, the following conditions apply: AVIN = PVIN = VIN = 5V. Limits in standard type are for TJ = 25°C only, limits in bold face type apply over the junction temperature (TJ) range of -40°C to +125°C. Minimum and Maximum limits are guaranteed through test, design, or statistical correlation. Typical values represent the most likely parametric norm at TJ = 25°C, and are provided for reference purposes only. Symbol Parameter Conditions Min Typ Max Unit VFB Feedback pin voltage VIN = 2.95V to 5.5V 0.788 0.8 0.81 V 2 ΔVOUT/ΔIOUT Load Regulation IOUT = 100 mA to 6A 0.08 %/A ICL Switch Current Limit Threshold VIN = 3.3V 7.35 8.5 9.35 A RDS_ON High-Side Switch On Resistance ISW = 3.5A 20 27 m Ω RDS_ON Low-Side Switch On Resistance ISW = 3.5A 16 23 m Ω IQ Operating Quiescent Current Non-switching, VFB = VCOMP 3.5 6 mA ISD Shutdown Quiescent current VEN = 0V 75 180 µA VUVLO VIN Under Voltage Lockout Rising VIN 2.45 2.7 2.95 V VUVLO_HYS VIN Under Voltage Lockout Hysteresis Falling VIN 45 100 mV VVCC VCC Voltage IVCC = 0 µA 2.45 2.7 2.95 V ISS Soft-Start Pin Source Current VSS/TRK = 0V 2 4.5 7 µA VTRACK SS/TRK Accuracy, VSS - VFB VSS/TRK = 0.4V -10 3 15 mV Oscillator FOSCH Oscillator Frequency RT = 49.9 kΩ 675 750 825 kHz FOSCL Oscillator Frequency RT = 249 kΩ 225 260 290 kHz DCMAX Maximum Duty Cycle ILOAD = 0A 85 % TON_TIME Minimum On Time 100 ns TCL_BLANK Current Sense Blanking Time After Rising VSW 80 ns Error Amplifier and Modulator IFB Feedback pin bias current VFB = 0.8V 1 100 nA ICOMP_SRC COMP Output Source Current VFB = 0.6V, VCOMP = 0.5V 80 100 µA ICOMP_SNK COMP Output Sink Current VFB = 1.0V, VCOMP = 0.6V 80 100 µA Copyright © 2008–2009, Texas Instruments Incorporated Submit Documentation Feedback 3 Product Folder Links: LM20146 |
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