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LM25085A Datasheet(PDF) 4 Page - Texas Instruments |
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LM25085A Datasheet(HTML) 4 Page - Texas Instruments |
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4 / 31 page  LM25085A SNVS601B – JANUARY 2009 – REVISED MARCH 2013 www.ti.com Electrical Characteristics (continued) Limits in standard type are for TJ = 25°C only; limits in boldface type apply over the junction temperature (TJ) range of -40°C to +125°C. Minimum and Maximum limits are specified 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. Unless otherwise stated the following conditions apply: VIN = 24V, RT = 100 kΩ. Symbol Parameter Conditions Min Typ Max Units RT Pin RTSD Shutdown threshold RT Pin voltage rising 0.73 V RTHYS Shutdown threshold hysteresis 50 mV On-Time tON – 1 On-time VIN = 4.5V, RT = 100 kΩ 3.5 5 7.15 µs tON – 2 VIN = 24V, RT = 100 kΩ 560 720 870 ns tON - 3 VIN = 42V, RT = 100 kΩ 329 415 500 ns tON - 4 Minimum on-time in current limit (3) VIN = 24V, 25 mV overdrive at ISEN 55 140 235 ns Off-Time tOFF(CL1) Off-time (current limit) (3) VIN = 12V, VFB = 0V 5.56 8 10.96 µs tOFF(CL2) VIN = 12V, VFB = 0.75V 2.59 3.7 5.16 µs tOFF(CL3) VIN = 24V, VFB = 0V 9.03 13.2 18.1 µs tOFF(CL4) VIN = 24V, VFB = 0.75V 4.29 6 8.54 µs Regulation and Over-Voltage Comparators (FB Pin) VREF FB regulation threshold 0.882 0.9 0.918 V VOV FB over-voltage threshold Measured with respect to VREF 350 mV IFB FB bias current 10 nA Soft-Start Function tSS Soft-start time 1.16 1.8 3.15 ms Thermal Shutdown TSD Junction shutdown temperature Junction temperature rising 170 °C THYS Junction shutdown hysteresis 20 °C Thermal Resistance(4) θJA Junction to ambient, 0 LFPM air VSSOP-8 package 126 °C/W flow (5) HVSSOP-PowerPAD-8 package 46 WSON-8 package 54 θJC Junction to case, 0 LFPM air flow VSSOP-8 package 29 °C/W (5) HVSSOP-PowerPAD-8 package 5.5 WSON-8 package 9.1 (3) The tolerance of the minimum on-time (tON-4) and the current limit off-times (tOFF(CL1) through (tOFF(CL4)) track each other over process and temperature variations. A device which has an on-time at the high end of the range will have an off-time that is at the high end of its range. (4) For detailed information on soldering plastic VSSOP and WSON packages visit www.ti.com/packaging. (5) Tested on a 4 layer JEDEC board. Four vias provided under the exposed pad. See JEDEC standards JESD51-5 and JESD51-7. 4 Submit Documentation Feedback Copyright © 2009–2013, Texas Instruments Incorporated Product Folder Links: LM25085A |
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Similar Description - LM25085A_15 |
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