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LM34923 Datasheet(PDF) 4 Page - Texas Instruments |
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LM34923 Datasheet(HTML) 4 Page - Texas Instruments |
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4 / 26 page  LM34923 SNVS695 – MARCH 2011 www.ti.com Electrical Characteristics Specifications with standard type are for TJ = 25°C only; limits in boldface type apply over the full Operating Junction Temperature (TJ) range. Minimum and Maximum limits are guaranteed 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 = 48V (1). Symbol Parameter Conditions Min Typ Max Units VCC Supply Vcc Reg Vcc Regulator Output Vin = 48V 7.1 7.5 7.9 V Vin – Vcc VIN = 6V, ICC = 5mA 240 mV Vcc Output Impedance Vin =6V 45 Ω Vcc Current Limit Vin = 48V (Note 4) 20 30 mA Vcc UVLO Vcc Increasing 4 4.8 V Vcc UVLO hysteresis 450 mV Iin Operating current FB = 3V, Vin = 48V 1 1.32 mA Iin Shutdown Current RT/SD = 0V 20 70 µA Switch Characteristics Buckswitch Rds(on) Itest = 200 mA 0.56 1.1 Ω Gate Drive UVLO Vbst – Vsw Rising 2.15 3 3.8 V Gate Drive UVLO hysteresis 250 mV Pre-charge switch voltage At 1 mA 0.8 V Pre-charge switch on-time 150 ns Current Limit Current Limit Threshold 700 1175 1500 mA Current Limit Response Time Iswitch = 1.24A, Time to 190 ns Switch Off TOFF-1 OFF time generator (test 1) FB=0V, VIN = 75V 37 µs TOFF-2 OFF time generator (test 2) FB=2.3V, VIN = 75V 7.2 µs TOFF-3 OFF time generator (test 3) FB=0V, VIN = 10V 5.7 µs TOFF-4 OFF time generator (test 4) FB=2.3V, VIN = 10V 1.25 µs On Time Generator TON - 1 On-Time Vin = 10V 2.2 3.3 4.51 µs Ron = 250K TON - 2 On-Time Vin = 75V 300 450 565 ns Ron = 250K Remote Shutdown Threshold Voltage at RT/SD rising 0.46 0.9 1.4 V Remote Shutdown Hysteresis 60 mV Minimum Off Time Minimum Off Time VIN = 6V 260 347 ns Regulation and OV Comparators FB Reference Threshold Internal reference 2.4365 2.5 2.5625 V Trip point for switch ON FB Over-Voltage Threshold Trip point for switch OFF 2.85 V FB Bias Current 1 nA Under Voltage Sensing UVTH UV Threshold 2.4 2.5 2.6 V UVHYS UV Hysteresis Current UV = 2V 2.7 5 7.3 uA UVBIAS UV Bias Current UV = 3V 1 nA UVOVOL UVO Output Low Voltage UV = 3V, IUVO = 5mA 360 600 mV UVOIOH UVO Leakage Current UV = 2V, VUVO = 7.8V 1 nA (1) All limits are guaranteed. All electrical characteristics having room temperature limits are tested during production with TA = TJ = 25°C. All hot and cold limits are guaranteed by correlating the electrical characteristics to process and temperature variations and applying statistical process control. 4 Submit Documentation Feedback Copyright © 2011, Texas Instruments Incorporated Product Folder Links: LM34923 |
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