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LM3620 Datasheet(PDF) 4 Page - National Semiconductor (TI) |
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LM3620 Datasheet(HTML) 4 Page - National Semiconductor (TI) |
4 / 6 page LM3620-8 V DRIVE = 5V, IDRIVE = 2mA. Limits with boldface type apply over the full operating ambient temperature range, 0˚C to + 70˚C, limits with standard typeface apply for T A = 25˚C. Symbol Parameter Conditions Typical Limit Units V REG Regulated Output Voltage (pin 1 to ground) Pin 5 shorted to pin 1 (graphite anode) 8.2 8.102/8.036 V(min) 8.298/8.364 V(max) Pin 5 open (coke anode) 8.4 8.299/8.232 V(min) 8.501/8.568 V(max) Regulated Output Voltage Tolerance Either Pin 5 setting ±1.2/±2.0 % V REG/VDRIVE Supply Sensitivity V REG for 5V ≤ VDRIVE ≤ 30V 200 µV/V(max) I Q Quiescent Current V REG = 8.7V, VEXT = 1.0V (Note 4) 400 750 µA(max) I OFF Off State Current V DRIVE open circuited (Note 5) 10 200 nA(max) I DRIVE Drive Pin Sink Current V DRIVE = 5.0V 20 15 mA(min) Gm (DRIVE) Drive Pin Transconductance ∆I DRIVE/∆VREG 2mA ≤ I DRIVE ≤15mA 1.5 A/V I EXT External Pin Source Current V EXT = 1V (Note 6) 3 2.5 mA(min) Gm (EXT) External Pin Transconductance ∆I EXT/∆VREG,VEXT = 1V 0mA ≤ I EXT ≤ 2.5mA 0.4 A/V R IN V REG Input Resistance Pin 1 to Ground. Circuit biased with V DRIVE applied V DRIVE open circuited 110 k Ω 42 M Ω R F Feedback Resistance Pin 1 to Pin 5 2900 Ω 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 do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. Note 2: The maximum power dissipation must be derated at elevated temperatures and is limited by TJMAX (maximum junction temperature), θJ-A (junction-to-ambient thermal resistance) and TA (ambient temperature). The maximum power dissipation at any temperature is: PDissMAX = (TJMAX −TA)/θJ-A up to the value listed in the Absolute Maximum Ratings. Note 3: Rating is for the human body model, a 100 pF capacitor discharged through a 1.5k Ω resistor into each pin. Note 4: Quiescent current is all current flowing to ground when the voltage at the VREG pin is forced to be above the nominal regulating voltage (VREG). Note 5: Off current is all of the current flowing to ground including all leakage current that would be drawn from the battery connected to the VREG terminal. Note 6: When the External pin is being used as the driving source, it is recommended to keep the operating point of VEXT ≤ 1V. If greater than 1V, the internal circuitry would bias IDRIVE to conduct up to the current limit level continuously causing unnecessary power dissipation in the device. www.national.com 4 |
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