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LM2734XMKX bảng dữ liệu(PDF) 3 Page - National Semiconductor (TI) |
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LM2734XMKX bảng dữ liệu(HTML) 3 Page - National Semiconductor (TI) |
3 / 22 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. V IN -0.5V to 24V SW Voltage -0.5V to 24V Boost Voltage -0.5V to 30V Boost to SW Voltage -0.5V to 6.0V FB Voltage -0.5V to 3.0V EN Voltage -0.5V to (V IN + 0.3V) Junction Temperature 150˚C ESD Susceptibility (Note 2) 2kV Storage Temp. Range -65˚C to 150˚C Soldering Information Infrared/Convection Reflow (15sec) 220˚C Wave Soldering Lead Temp. (10sec) 260˚C Operating Ratings (Note 1) V IN 3V to 20V SW Voltage -0.5V to 20V Boost Voltage -0.5V to 25V Boost to SW Voltage 1.6V to 5.5V Junction Temperature Range −40˚C to +125˚C Thermal Resistance θ JA (Note 3) 118˚C/W Electrical Characteristics Specifications with standard typeface are for T J = 25˚C, and those in boldface type apply over the full Operating Tempera- ture Range (T J = -40˚C to 125˚C). VIN = 5V, VBOOST -VSW = 5V unless otherwise specified. Datasheet min/max specification limits are guaranteed by design, test, or statistical analysis. Symbol Parameter Conditions Min (Note 4) Typ (Note 5) Max (Note 4) Units V FB Feedback Voltage 0.784 0.800 0.816 V ∆V FB/ ∆V IN Feedback Voltage Line Regulation V IN =3Vto20V 0.01 % / V I FB Feedback Input Bias Current Sink/Source 10 250 nA UVLO Undervoltage Lockout V IN Rising 2.74 2.90 V Undervoltage Lockout V IN Falling 2.0 2.3 UVLO Hysteresis 0.30 0.44 0.62 F SW Switching Frequency LM2734X 1.2 1.6 1.9 MHz LM2734Y 0.40 0.55 0.66 D MAX Maximum Duty Cycle LM2734X 85 92 % LM2734Y 90 96 D MIN Minimum Duty Cycle LM2734X 2 % LM2734Y 1 R DS(ON) Switch ON Resistance V BOOST -VSW = 3V 300 600 m Ω I CL Switch Current Limit V BOOST -VSW =3V 1.2 1.7 2.5 A I Q Quiescent Current Switching 1.5 2.5 mA Quiescent Current (shutdown) V EN =0V 30 nA I BOOST Boost Pin Current LM2734X (50% Duty Cycle) 2.5 3.5 mA LM2734Y (50% Duty Cycle) 1.0 1.8 V EN_TH Shutdown Threshold Voltage V EN Falling 0.4 V Enable Threshold Voltage V EN Rising 1.8 I EN Enable Pin Current Sink/Source 10 nA I SW Switch Leakage 40 nA Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is intended to be functional, but specific performance is not guaranteed. For guaranteed specifications and the test conditions, see Electrical Characteristics. Note 2: Human body model, 1.5k Ω in series with 100pF. Note 3: Thermal shutdown will occur if the junction temperature exceeds 165˚C. The maximum power dissipation is a function of TJ(MAX) , θJA and TA . The maximum allowable power dissipation at any ambient temperature is PD =(TJ(MAX) –TA)/θJA . All numbers apply for packages soldered directly onto a 3” x 3” PC board with 2oz. copper on 4 layers in still air. For a 2 layer board using 1 oz. copper in still air, θJA = 204˚C/W. Note 4: Guaranteed to National’s Average Outgoing Quality Level (AOQL). Note 5: Typicals represent the most likely parametric norm. www.national.com 3 |
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