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LM34919 датащи(PDF) 4 Page - Texas Instruments |
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LM34919 датащи(HTML) 4 Page - Texas Instruments |
4 / 21 page LM34919 SNOSAY2D – MAY 2007 – REVISED JUNE 2008 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 specified 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 = 12V, RON = 200kΩ. See (1). Symbol Parameter Test Conditions Min Typ Max Unit Start-Up Regulator, VCC VCCReg VCC regulated output 6.6 7 7.4 V VIN-VCC dropout voltage ICC = 0 mA, 1.2 V VCC = UVLOVCC + 250 mV VCC output impedance 0 mA ≤ ICC ≤ 5 mA, VIN = 8V 175 Ω VCC current limit (2) VCC = 0V 9.5 mA UVLOVCC VCC under-voltage lockout threshold VCC increasing 5.7 V UVLOVCC hysteresis VCC decreasing 150 mV UVLOVCC filter delay 100 mV overdrive 3 µs IQ IIN operating current Non-switching, FB = 3V, SW = Open 0.5 0.8 mA ISD IIN shutdown current RON/SD = 0V, SW = Open 75 150 µA Switch Characteristics Rds(on) Buck Switch Rds(on) ITEST = 200 mA 0.5 1.0 Ω UVLOGD Gate Drive UVLO VBST - VSW Increasing 3.0 4.4 5.2 V UVLOGD hysteresis 480 mV Softstart Pin VSS Pull-up voltage 2.5 V Internal current source VSS = 1V 10.5 µA Current Limit ILIM Threshold Current out of ISEN 0.52 0.64 0.76 A Resistance from ISEN to SGND 140 m Ω Response time 150 ns On Timer tON - 1 On-time VIN = 10V, RON = 200 kΩ 2.1 2.77 3.5 µs tON - 2 On-time VIN = 40V, RON = 200 kΩ 700 ns Shutdown threshold Voltage at RON/SD rising 0.45 0.8 1.2 V Threshold hysteresis Voltage at RON/SD 25 mV Off Timer tOFF Minimum Off-time 155 ns Regulation and Over-Voltage Comparators (FB Pin) VREF FB regulation threshold SS pin = steady state 2.440 2.5 2.550 V FB over-voltage threshold 2.9 V FB bias current FB = 3V 1 nA Thermal Shutdown TSD Thermal shutdown temperature 175 °C Thermal shutdown hysteresis 20 °C Thermal Resistance θJA Junction to Ambient 0 LFPM Air Flow 61 °C/W (1) Typical specifications represent the most likely parametric norm at 25°C operation. (2) VCC provides self bias for the internal gate drive and control circuits. Device thermal limitations limit external loading 4 Submit Documentation Feedback Copyright © 2007–2008, Texas Instruments Incorporated Product Folder Links: LM34919 |
Аналогичный номер детали - LM34919_14 |
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Аналогичное описание - LM34919_14 |
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