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LM2791 Datasheet(PDF) 4 Page - National Semiconductor (TI) |
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LM2791 Datasheet(HTML) 4 Page - National Semiconductor (TI) |
4 / 11 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. V IN −0.3 to 6V BRGT, SD -0.3 to (V IN +0.2V) Power Dissipation(Note 2) 400 mW T JMAX (Note 2) 150˚C θ JA (Note 7) 55˚C/W Storge Temperature −65˚C to +100˚C Lead Temp. (Soldering, 5 sec.) 260˚C ESD Rating Human Body Model 2KV Machine Model 200V Operating Conditions Input Voltage (V IN) 3.0V to 5.8V BRGT 0 to 3.0V Ambient Temperature (T A) −30˚C to +85˚C Junction Temperature (T J) −30˚C to +100˚C Electrical Characteristics Limits in standard typeface are for T J = 25˚C and limits in boldface type apply over the full Operating Temperature Range. Unless otherwise specified, C 1 =CIN =CHOLD = 1 µF, VIN = 3.6V, VDIODE = 3.6V, RSET = 332 Ω, BRGT pin = 0V. Symbol Parameter Conditions Min Typ Max Units I DX Diode Current at ID1,2 V IN= 3V, RSET = 270 Ω 16.5 18 mA Available Current at Output Dx V IN= 3V 14.5 V IN= 3.3V 12.8 15.1 17.7 V IN= 3.6V 13.3 15.7 18.4 V IN = 4.4V 16.8 I Dx Load Regulation at Output Dx V IN =3.6V V DX=3.0V V DX=4.0V 16 15.4 mA I DX Line Regulation of Dx Output Current 3.3V ≤ V IN ≤ 4.4V V DX = 3.6V 15.7 mA I D-MATCH Current Matching Between Any Two Outputs 3.0V ≤ V IN ≤ 4.4V V D1,VD2 = 3.6V 0.3 % I Q Quiescent Supply Current 3.0V ≤ V IN ≤ 4.4V, Active, No Load Current 0.7 2 mA I SD Shutdown Supply Current 3.0V ≤ V IN ≤ 5.5V, Shutdown at 85˚C 0.1 0.3 1µA V IH SD Input Logic High 3.0V ≤ V IN ≤ 5.5V, (Note 5) 0.8V IN V V IL SD Input Logic Low 3.0V ≤ V IN ≤ 5.5V, (Note 5) 0.2V IN V I LEAK-SD SD Input Leakage Current 0V ≤ V SD ≤ V IN 0.1 µA R BRGT BRGT Input Resistance 250 k Ω I SET I SET Pin Output Current I Dx/25 mA f SW Switching Frequency (Note 4) 3.0V ≤ V IN ≤ 4.4V 450 650 850 kHz t START Startup Time(Note 6) I Dx = 90% steady state 10 µs 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: D1 and D2 may be shorted to GND without damage. POUT may be shorted to GND for 1sec without damage. Note 3: In the test circuit, all capacitors are 1.0µF, 0.3 Ω maximum ESR capacitors. Capacitors with higher ESR will increase output resistance, reduce output voltage and efficiency. Note 4: The output switches operate at one half of the oscillator frequency, fOSC =2fSW. Note 5: The interanl thresholds of the shutdown bar are set at about 40% of VIN. Note 6: This electrical specification is guaranteed by design. Note 7: For more inforamtion regarding the LLP package, please refer to National Semiconductor Application note AN1187 www.national.com 4 |
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