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LM2655 Datasheet(PDF) 6 Page - National Semiconductor (TI) |
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LM2655 Datasheet(HTML) 6 Page - National Semiconductor (TI) |
6 / 16 page Low-side Driver (LDR) Parameters Specifications with standard typeface are for T J = 25˚C, and those in boldface type apply over full Operating Temperature Range.V IN = 10V unless otherwise specified. Symbol Parameter Conditions Typical (Note 5) Limit (Note 6) Units V OH Logic High Level V IN = 10V 6.8 6.6 V V(min) V IN = 6.0V 6 5.8 V V(min) V OL Logic Low Level 0 0.05 V V(max) I SINK LDR Sink Current LDR Voltage = 1V 500 mA I SOURCE LDR Source Current LDR Voltage = 2V 180 mA T RR Rise Time C GS=1000pF 18 ns T F Fall Time C GS=1000pF 7 ns Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is in- tended to be functional, but device parameter specifications may not be guaranteed under these conditions. For guaranteed specifications and test conditions, see the Electrical Characteristics. Note 2: The maximum allowable power dissipation is calculated by using PDMAX = (TJMAX −TA)/θJA, where TJMAX is the maximum junction temperature, TA is the ambient temperature, and θJA is the junction-to-ambient thermal resistance of the specified package. The 893 mW rating results from using 150˚C, 25˚C, and 140˚C/W for TJMAX,TA, and θJA respectively. A θJA of 140˚C/W represents the worst-case condition of no heat sinking of the 16-pin TSSOP package. Heat sinking allows the safe dissipation of more power. The Absolute Maximum power dissipation must be derated by 7.14 mW per ˚C above 25˚C ambient. The LM2655 actively limits its junction temperatures to about 165˚C. Note 3: The human body model is a 100 pF capacitor discharged through a 1.5 k Ω resistor into each pin. The machine model is a 200pF capacitor discharged di- rectly into each pin. Note 4: ESD susceptibility using the human body model is 500V for VCB,VSW, LDR, and LDELAY. Note 5: Typical numbers are at 25˚C and represent the most likely norm. Note 6: All limits guaranteed at room temperature (standard typeface) and at temperature extremes (bold typeface). All room temperature limits are 100% pro- duction tested. All limits at temperature extremes are guaranteed via correlation using standard Statistical Quality Control (SQC) methods. All limits are used to cal- culate Average Outgoing Quality Level (AOQL). Note 7: Measured with respect to VSW. Note 8: Measured while switching in closed loop with Vin = 15V. Note 9: Average output current limit obtained using typical application circuit. This figure is dependant on the the inductor used. Note 10: Bond wire resistance accounts for approximately 40m Ω of RSW(ON). Typical Performance Characteristics Efficiency vs Load Current (V IN =5V, VOUT = 3.3V) DS101284-5 Efficiency vs V IN (I LOAD = 0.5A) (Synchronous) DS101284-6 www.national.com 6 |
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