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LM1770 数据表(PDF) 3 Page - National Semiconductor (TI) |
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LM1770 数据表(HTML) 3 Page - National Semiconductor (TI) |
3 / 14 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 Storage Temperature Range −65˚C to 150˚C Junction Temperature 150˚C Lead Temperature (soldering, 10sec) 260˚C ESD Rating 2.5kV 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 VFB Feedback pin voltage V IN = 3.3V 0.782 0.80 0.818 V V IN = 5.0V 0.772 0.79 0.808 ∆V FB / ∆V IN Line Regulation V IN = 2.8V to 5.5V -5 mV/V I Q Operating Quiescent current V FB = 0.9V 400 600 µA T ON Switch On-Time LM1770S - (500ns) 0.4 0.5 0.6 µs LM1770T - (1000ns) 0.8 1.0 1.2 LM1770U - (2000ns) 1.6 2.0 2.4 T OFF_MIN Minimum Off-Time LM1770S - (500ns) 150 250 ns LM1770T - (1000ns) 135 225 LM1770U - (2000ns) 120 220 T D Gate Drive Dead-Time 70 ns I FB Feedback pin bias current V FB = 0.9V 50 nA V UVLO Under-voltage lock out V IN Rising Edge 2.6 2.8 V V UVLO_HYS Under-voltage lock out hysteresis 30 mV V SC_TH Feedback pin Short Circuit Latch Threshold 0.5 0.55 0.65 V R DS(ON) 1 HG FET driver pull-up On resistance I HG =20mA 5 Ω R DS(ON) 2 HG FET driver pull-down On resistance I HG =20mA 9 Ω R DS(ON) 3 LG FET driver pull-up On resistance I LG =20mA 9 Ω R DS(ON) 4 LG FET driver pull-down On resistance I LG =20mA 5 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 |
类似零件编号 - LM1770 |
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类似说明 - LM1770 |
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