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LM2681 Datasheet(PDF) 2 Page - National Semiconductor (TI) |
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LM2681 Datasheet(HTML) 2 Page - National Semiconductor (TI) |
2 / 8 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. Supply Voltage (V+ to GND, or GND to OUT) 5.8V V+ and OUT Continuous Output Current 30 mA Output Short-Circuit Duration to GND (Note 2) 1 sec. Continuous Power Dissipation (T A = 25˚C)(Note 3) 600 mW T JMax(Note 3) 150˚C θ JA (Note 3) 210˚C/W Operating Junction Temperature Range −40˚ to 85˚C Storage Temperature Range −65˚C to +150˚C Lead Temp. (Soldering, 10 seconds) 300˚C ESD Rating 2kV Electrical Characteristics Limits in standard typeface are for T J = 25˚C, and limits in boldface type apply over the full operating temperature range. Un- less otherwise specified: V+ = 5V, C 1 = C2 = 3.3 µF. (Note 4) Symbol Parameter Condition Min Typ Max Units V+ Supply Voltage 2.5 5.5 V I Q Supply Current No Load 550 1000 µA I L Output Current 20 mA R SW Sum of the R ds(on)of the four internal MOSFET switches I L = 20 mA 8 16 Ω R OUT Output Resistance (Note 5) I L = 20 mA 15 40 Ω f OSC Oscillator Frequency (Note 6) 80 160 kHz f SW Switching Frequency (Note 6) 40 80 kHz P EFF Power Efficiency R L (1.0k) between GND and OUT 86 93 % I L = 20 mA to GND 90 V OEFF Voltage Conversion Efficiency No Load 99 99.96 % Note 1: Absolute maximum ratings indicate limits beyond which damage to the device may occur. Electrical specifications do not apply when operating the device beyond its rated operating conditions. Note 2: OUT may be shorted to GND for one second without damage. However, shorting OUT to V+ may damage the device and should be avoided. Also, for tem- peratures above 85˚C, OUT must not be shorted to GND or V+, or device may be damaged. Note 3: 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. Note 4: In the test circuit, capacitors C1 and C2 are 3.3 µF, 0.3Ω maximum ESR capacitors. Capacitors with higher ESR will increase output resistance, reduce output voltage and efficiency. Note 5: Specified output resistance includes internal switch resistance and capacitor ESR. See the details in the application information for positive voltage doubler. Note 6: The output switches operate at one half of the oscillator frequency, fOSC = 2fSW. www.national.com 2 |
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Descripción similar - LM2681 |
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