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LM2585S-3.3 데이터시트(PDF) 4 Page - National Semiconductor (TI) |
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LM2585S-3.3 데이터시트(HTML) 4 Page - National Semiconductor (TI) |
4 / 25 page Electrical Characteristics (All Versions) Symbol Parameters Conditions Typical Min Max Units COMMON DEVICE PARAMETERS for all versions (Note 5) I S Input Supply (Switch Off) 11 15.5/16.5 mA Current (Note 8) I SWITCH = 1.8A 50 100/115 mA V UV Input Supply R LOAD = 100Ω 3.30 3.05 3.75 V Undervoltage Lockout f O Oscillator Frequency Measured at Switch Pin R LOAD = 100Ω 100 85/75 115/125 kHz V COMP = 1.0V f SC Short-Circuit Measured at Switch Pin Frequency R LOAD = 100Ω 25 kHz V FEEDBACK = 1.15V V EAO Error Amplifier Upper Limit 2.8 2.6/2.4 V Output Swing (Note 7) Lower Limit 0.25 0.40/0.55 V (Note 8) I EAO Error Amp (Note 9) Output Current 165 110/70 260/320 µA (Source or Sink) I SS Soft Start Current V FEEDBACK = 0.92V 11.0 8.0/7.0 17.0/19.0 µA V COMP = 1.0V D Maximum Duty R LOAD = 100Ω 98 93/90 % Cycle (Note 7) I L Switch Leakage Switch Off 15 300/600 µA Current V SWITCH = 60V V SUS Switch Sustaining dV/dT = 1.5V/ns 65 V Voltage V SAT Switch Saturation I SWITCH = 3.0A 0.45 0.65/0.9 V Voltage I CL NPN Switch 4.0 3.0 7.0 A Current Limit θ JA Thermal Resistance T Package, Junction to Ambient (Note 10) 65 θ JA T Package, Junction to Ambient (Note 11) 45 θ JC T Package, Junction to Case 2 θ JA S Package, Junction to Ambient (Note 12) 56 ˚C/W θ JA S Package, Junction to Ambient (Note 13) 35 θ JA S Package, Junction to Ambient (Note 14) 26 θ JC S Package, Junction to Case 2 Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating ratings indicate conditions the device is intended 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: Note that switch current and output current are not identical in a step-up regulator. Output current cannot be internally limited when the LM2585 is used as a step-up regulator. To prevent damage to the switch, the output current must be externally limited to 3A. However, output current is internally limited when the LM2585 is used as a flyback regulator (see the Application Hints section for more information). www.national.com 4 |
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