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LM25018 Datasheet(PDF) 5 Page - Texas Instruments |
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LM25018 Datasheet(HTML) 5 Page - Texas Instruments |
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5 / 31 page  LM25018 www.ti.com SNVS953D – DECEMBER 2012 – REVISED DECEMBER 2014 6.5 Electrical Characteristics Typical values correspond to TJ = 25°C. Minimum and maximum limits apply over –40°C to 125°C junction temperature range, unless otherwise stated. VIN = 48 V unless otherwise stated. See (1). PARAMETER TEST 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 Undervoltage Lockout Voltage 4.15 4.5 4.9 V (VCC increasing) VCC Undervoltage Hysteresis 300 mV VCC Drop Out Voltage VIN = 9 V, ICC = 20 mA 2.3 V IIN Operating Current Nonswitching, FB = 3 V 1.75 mA IIN Shutdown Current UVLO = 0 V 50 225 µA SWITCH CHARACTERISTICS Buck Switch RDS(ON) ITEST = 200 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 CURRENT LIMIT Current Limit Threshold 390 575 750 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 REGULATION AND OVERVOLTAGE COMPARATORS Internal Reference Trip Point for FB Regulation Level 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 UNDERVOLTAGE 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 THERMAL SHUTDOWN Tsd Thermal Shutdown Temperature 165 °C Thermal Shutdown Hysteresis 20 °C (1) All hot and cold limits are specified 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. 6.6 Switching Characteristics Typical values correspond to TJ = 25°C. Minimum and maximum limits apply over –40°C to 125°C junction temperature range unless otherwise stated. VIN = 48 V unless otherwise stated. MIN TYP MAX UNIT 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 4 VIN = 10 V, RON = 250 k 1880 3200 4425 ns MINIMUM OFF-TIME Minimum Off-Timer FB = 0 V 144 ns Copyright © 2012–2014, Texas Instruments Incorporated Submit Documentation Feedback 5 Product Folder Links: LM25018 |
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