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LM1770 Scheda tecnica(PDF) 3 Page - Texas Instruments |
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LM1770 Scheda tecnica(HTML) 3 Page - Texas Instruments |
3 / 24 page LM1770 www.ti.com SNVS403C – SEPTEMBER 2005 – REVISED APRIL 2013 Electrical Characteristics (1) Specifications with standard typeface are for TJ = 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 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 specified VIN = 3.3V. Symbol Parameter Conditions Min Typ Max Unit VFB Feedback pin voltage VIN = 3.3V 0.782 0.80 0.818 V VIN = 5.0V 0.772 0.79 0.808 ΔVFB / ΔVIN Line Regulation VIN = 2.8V to 5.5V -5 mV/V IQ Operating Quiescent current VFB = 0.9V 400 600 µA TON 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 TOFF_MIN Minimum Off-Time LM1770S - (500ns) 150 250 ns LM1770T - (1000ns) 135 225 LM1770U - (2000ns) 120 220 TD Gate Drive Dead-Time 70 ns IFB Feedback pin bias current VFB = 0.9V 50 nA VUVLO Under-voltage lock out VIN Rising Edge 2.6 2.8 V VUVLO_HYS Under-voltage lock out hysteresis 30 mV VSC_TH Feedback pin Short Circuit Latch 0.5 0.55 0.65 V Threshold RDS(ON) 1 HG FET driver pull-up On resistance IHG = 20 mA 5 Ω RDS(ON) 2 HG FET driver pull-down On resistance IHG = 20 mA 9 Ω RDS(ON) 3 LG FET driver pull-up On resistance ILG = 20 mA 9 Ω RDS(ON) 4 LG FET driver pull-down On resistance ILG = 20 mA 5 Ω (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 ensure specific performance limits. For ensured specifications, see Electrical Characteristics. Copyright © 2005–2013, Texas Instruments Incorporated Submit Documentation Feedback 3 Product Folder Links: LM1770 |
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