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LM34925 Scheda tecnica(PDF) 4 Page - Texas Instruments |
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LM34925 Scheda tecnica(HTML) 4 Page - Texas Instruments |
4 / 26 page LM34925 SNVS846E – JUNE 2012 – REVISED DECEMBER 2013 www.ti.com Electrical Characteristics Specifications with standard typeface are for TJ = 25°C, and those with boldface type apply over full Operating Junction Temperature range. VIN = 48 V, unless otherwise stated. See (1). Symbol Parameter Conditions Min Typ Max Unit VCC Supply VCC Reg VCC Regulator Output VIN = 48 V, ICC = 20 mA 6.25 7.6 8.55 V VCC Current Limit VIN = 48 V (2) 26 mA VCC UVLO Threshold (VCC 4.15 4.5 4.9 V increasing) VCC UVLO Hysteresis 300 mV VCC Drop Out Voltage VIN = 8 V, ICC = 20 mA 2.3 V IIN Operating Current Non-Switching, FB = 3 V 1.75 mA IIN Shutdown Current UVLO = 0 V 50 225 µA Under-Voltage Sensing Function UV Threshold UV Rising 1.19 1.225 1.26 V UV Hysteresis Input Current UV = 2.5 V -10 -20 -29 µA Remote Shutdown Threshold Voltage at UVLO Falling 0.32 0.66 V Remote Shutdown Hysteresis 110 mV Regulation and Over-Voltage Comparators FB Regulation Level Internal Reference Trip Point for 1.2 1.225 1.25 V Switch ON FB Overvoltage Threshold Trip Point for Switch OFF 1.62 V FB Bias Current 60 nA Switch Characteristics Buck Switch RDS(ON) ITEST = 100 mA, BST-SW = 7 V 0.8 1.8 Ω Synchronous RDS(ON) ITEST = 200 mA 0.45 1 Ω Gate Drive UVLO VBST − VSW Rising 2.4 3 3.6 V Gate Drive UVLO Hysteresis 260 mV Minimum Off-Time Minimum Off-Timer FB = 0 V 144 ns On Time Generator TON Test 1 VIN = 32 V, RON = 100 k 270 350 460 ns TON Test 2 VIN = 48 V, RON = 100 k 188 250 336 ns TON Test 3 VIN = 75 V, RON = 250 k 250 370 500 ns TON Test 4 VIN = 10 V, RON = 250 k 1880 3200 4425 ns Current Limit Current Limit Threshold 150 270 370 mA Current Limit Response Time Time to Switch Off 150 ns OFF-Time Generator (Test 1) FB = 0.1 V, VIN = 48 V 12 µs OFF-Time Generator (Test 2) FB = 1.0 V, VIN = 48 V 2.5 µs (1) All limits are verified by design. All electrical characteristics having room temperature limits are tested during production at TA = 25°C. All hot and cold limits are verified by correlating the electrical characteristics to process and temperature variations and applying statistical process control. (2) VCC provides self bias for the internal gate drive and control circuits. Device thermal limitations limit external loading. 4 Submit Documentation Feedback Copyright © 2012–2013, Texas Instruments Incorporated Product Folder Links: LM34925 |
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