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LM21305 bảng dữ liệu(PDF) 4 Page - Texas Instruments |
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LM21305 bảng dữ liệu(HTML) 4 Page - Texas Instruments |
4 / 33 page LM21305 SNVS639F – DECEMBER 2009 – REVISED MARCH 2013 www.ti.com ESD Ratings All pins, Human Body Model (1) ±2kV (1) The Human Body Model is a 100 pF capacitor discharged through a 1.5 k Ω resistor into each pin (MIL-STD-883 3015.7). Operating Ratings PVIN to PGND, AGND 3V to 18V AVIN to PGND, AGND 3V to 18V Junction Temperature −40°C to 125°C Ambient Temperature(1) −40°C to 85°C Junction-to-Ambient Thermal Resistance θJA (2) 32.4°C/W (1) In applications where high power dissipation and/or poor package thermal resistance is present, the maximum ambient temperature may have to be de-rated. Maximum ambient temperature (TA-MAX) is dependent on the maximum operating junction temperature (TJ-MAX-OP = 125°C), the maximum power dissipation of the device in the application (PD-MAX), and the junction-to ambient thermal resistance of the part/package in the application ( θJA), as given by the following equation: TA-MAX = TJ-MAX-OP – (θJA × PD-MAX). (2) Junction-to-ambient thermal resistance ( θJA) is taken from a thermal modeling result, performed under the conditions and guidelines set forth in the JEDEC standard JESD51-7. The test board is a 4-layer standard JEDEC thermal test board or 4LJEDEC, 4" x 3" in size, with a 3 by 3 array of thermal vias. The board has two embedded copper layers which cover roughly the same size as the board. The copper thickness for the four layers, starting from the top one, is 2 oz./1oz./1oz./2 oz. For WQFN, thermal vias are placed between the die attach pad in the 1st. copper layer and 2nd. copper layer. Detailed description of the board can be found in JESD 51-7. Ambient temperature in the simulation is 22°C, still air. Power dissipation is 1W. The value of θJA of this product can vary significantly depending on PCB material, layout, and environmental conditions. In applications with high power dissipation (e.g. high VOUT, high IOUT), special care must be paid to thermal dissipation issues. For more information on these topics, please refer to Application Note AN-1187: Leadless Leadframe Package (LLP) (literature number SNOA401). Electrical Characteristics (1) (2) (2) Specifications with standard typeface are for TJ = 25°C, and those in boldface type apply over the full Operating Temperature Range (TJ = -40°C to +125°C). Unless otherwise specified, VIN = VPVIN = VAVIN = 12V, VOUT = 3.3V, IOUT = 0A. Symbol Parameter Remarks Min Typ Max Unit Feedback pin factory-default VFB-default 0.588 0.598 0.608 V voltage ΔVOUT/ΔIOUT Load Regulation IOUT = 0.1A to 5A 0.02 %/A ΔVOUT/ΔVIN Line Regulation VPVIN = 3V to 18V 0.01 %/V High-Side Switch On RDSonHS IDS = 5A 44 m Ω Resistance Low-Side Switch On RDSonLS IDS = 5A 22 m Ω Resistance ICL-HS High-Side Switch Current Limit High-side FET 5.9 7.0 7.87 A ICL-LS Low-Side Switch Current Limit Low-side FET (3) 5.9 8.0 10.2 A Low-Side Switch Negative INEG-CL-LS Low-side FET -7.0 -4.1 -1.64 A Current Limit VAVIN = V PVIN = 5V 0.1 2 ISD Quiescent Current, disabled µA VAVIN = V PVIN = 18V 1 4.1 Quiescent Current, enabled, IQ VAVIN = V PVIN = 18V 9 9.7 mA not switching Feedback Pin Input Bias IFB VFB = 0.598V 1 nA Current Error Amplifier GM 2400 µS Transconductance AVOL Error Amplifier Voltage Gain 65 dB Output voltage rising threshold, VIH-OVP OVP Tripping Threshold 103.5 109.5 115 % percentage of VOUT VHYST-OVP OVP Hysteresis Window Percentage of VOUT -4.3 % (1) All limits are specified by design, test and/or statistical analysis. All electrical characteristics having room-temperature limits are tested during production with TJ = 25°C. All hot and cold limits are specified by correlating the electrical characteristics to process and temperature variations and applying statistical process control. (2) Capacitors: low ESR surface-mount ceramic capacitors (MLCCs) are used in setting electrical characteristics. (3) The low-side switch current limit is ensured to be higher than the high-side current limit. 4 Submit Documentation Feedback Copyright © 2009–2013, Texas Instruments Incorporated Product Folder Links: LM21305 |
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