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LM34919BQTLX Datasheet(PDF) 4 Page - National Semiconductor (TI) |
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LM34919BQTLX Datasheet(HTML) 4 Page - National Semiconductor (TI) |
4 / 20 page Absolute Maximum Ratings (Note 1) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. VIN to RTN 44V BST to RTN 52V SW to RTN (Steady State) -1.5V to 44V ESD Rating (Note 2) Human Body Model 2kV BST to VCC 44V BST to SW 14V VCC to RTN 14V SGND to RTN -0.3V to +0.3V SS, RON/SD to RTN -0.3V to 4V FB to RTN -0.3 to 7V Storage Temperature Range -65°C to +150°C For soldering specs see: www.national.com/ms/MS/MS-SOLDERING.pdf JunctionTemperature 150°C Operating Ratings (Note 1) VIN 6.0V to 40V Junction Temperature −40°C to + 125°C Electrical Characteristics Specifications with standard type are for T J = 25°C only; limits in boldface type apply over the full Operating Junction Temperature (T J) range. Minimum and Maximum limits are guaranteed through test, design, or statistical correlation. Typical values represent the most likely parametric norm at T J = 25°C, and are provided for reference purposes only. Unless otherwise stated the following conditions apply: V IN = 12V, RON = 20kΩ. See (Note 4). Symbol Parameter Conditions Min Typ Max Units Start-Up Regulator, V CC V CCReg V CC regulated output V IN = 12V 6.6 7 7.4 V V IN =6V, ICC = 3 mA, 5.3 5.91 V IN-VCC dropout voltage I CC = 0 mA, non-switching V CC = UVLOVCC + 250 mV 20 mV V CC Output Impedance 0 mA ≤ I CC ≤ 5 mA, VIN = 6V 24 Ω 0 mA ≤ I CC ≤ 5 mA, VIN = 8V 12 V CC current limit (Note 3) V CC = 0V 15 mA UVLO VCC V CC under-voltage lockout threshold measured at V CC V CC increasing 5.25 V V CC decreasing 5.1 5.25 V UVLO VCC hysteresis, at VCC 150 mV V CC under-voltage lock-out threshold measured at V IN V IN increasing, ICC = 3 mA 5.25 5.6 V V IN decreasing, ICC = 3 mA 5.1 5.4 V UVLO VCC filter delay 100 mV overdrive 3 µs I Q I IN operating current Non-switching, FB = 3V, SW = Open 0.78 1.0 mA I SD I IN shutdown current RON/SD = 0V, SW = Open 215 330 µA Switch Characteristics Rds(on) Buck Switch Rds(on) I TEST = 200 mA 0.5 1.0 Ω UVLO GD Gate Drive UVLO V BST - VSW Increasing 2.65 3.6 4.40 V V BST - VSW Decreasing 3.2 UVLO GD hysteresis 400 mV Softstart Pin V SS Pull-up voltage 2.5 V Internal current source V SS = 1V 10.5 µA Current Limit I LIM Threshold Current out of ISEN 0.52 0.64 0.76 A Resistance from ISEN to SGND 135 m Ω Response time 50 ns On Timer t ON - 1 On-time V IN = 12V, RON = 20kΩ 127 170 213 ns t ON - 2 On-time V IN = 24V, RON = 20 kΩ 110 ns t ON - 3 On-time V IN = 6V, RON = 20 kΩ 335 ns Shutdown threshold Voltage at RON/SD rising 0.4 0.74 1.2 V www.national.com 4 |
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