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LM34926 Datasheet(PDF) 5 Page - Texas Instruments |
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LM34926 Datasheet(HTML) 5 Page - Texas Instruments |
5 / 28 page LM34926 www.ti.com SNVS847E – JUNE 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 = 48V unless stated otherwise. 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 UVLO Threshold (VCC increasing) 4.15 4.5 4.9 V VCC UVLO Hysteresis 300 mV VCC Drop Out Voltage VIN = 8 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 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 REGULATION AND OVERVOLTAGE COMPARATORS Internal Reference Trip Point for Switch FB Regulation Level 1.2 1.225 1.25 V ON FB Overvoltage Threshold Trip Point for Switch OFF 1.62 V FB Bias Current 60 nA 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 THERMAL SHUTDOWN Tsd Thermal Shutdown Temperature 165 °C Thermal Shutdown Hysteresis 20 °C (1) All limits are specified by design. All electrical characteristics having room temperature limits are tested during production at TA = 25°C. All hot and cold limits are ensured 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. Copyright © 2012–2014, Texas Instruments Incorporated Submit Documentation Feedback 5 Product Folder Links: LM34926 |
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