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LM1771_0608 Scheda tecnica(PDF) 3 Page - National Semiconductor (TI) |
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LM1771_0608 Scheda tecnica(HTML) 3 Page - National Semiconductor (TI) |
3 / 17 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 -0.3V to 6V EN, FB, HG, LG -0.3V to V IN Storage Temperature Range −65˚C to 150˚C Junction Temperature 150˚C Lead Temperature (soldering, 10sec) 260˚C ESD Rating 2kV Operating Ratings V IN to GND 2.8V to 5.5V Junction Temperature Range (T J) −40˚C to +125˚C Electrical Characteristics Specifications with standard typeface are for T J = 25˚C, and those in bold face type apply over the full Junction Temperature Range (−40˚C to +125˚C). 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 specified V IN = 3.3V. Symbol Parameter Conditions Min Typ Max Unit V FB Feedback pin voltage 0.782 0.8 0.818 V I Q Quiescent current V FB = 0.9V 400 700 µA T ON Switch On-Time LM1771S - (500ns) 0.4 0.5 0.6 µs LM1771T - (1000ns) 0.8 1.0 1.2 LM1771U - (2000ns) 1.6 2.0 2.4 T OFF_MIN Minimum Off-Time LM1771S - (500ns) 150 250 ns LM1771T - (1000ns) 135 225 LM1771U - (2000ns) 120 220 T D Gate Drive Dead-Time 70 ns V IH_EN EN Pin Rising Threshold 1.15 1.2 1.25 V V EN_HYS EN Pin Hysteresis 50 200 mV I FB Feedback pin bias current V FB = 0.9V 50 nA V UVLO Under-voltage lock out V IN Rising Edge 2.65 2.8 V V UVLO_HYS Under-voltage lock out hysteresis 50 mV V SC_TH Feedback pin Short Circuit Latch Threshold 0.42 0.55 0.65 V R DS(ON) 1 HG FET driver pull-up On resistance I HG =20mA 4 Ω R DS(ON) 2 HG FET driver pull-down On resistance I HG =20mA 6 Ω R DS(ON) 3 LG FET driver pull-up On resistance I LG =20mA 4 Ω R DS(ON) 4 LG FET driver pull-down On resistance I LG =20mA 6 Ω Note 1: Absolute Maximum Ratings indicate limits beyond which damage may occur to the device. Operating Ratings indicate conditions for which the device is intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications, see Electrical Characteristics. www.national.com 3 |
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