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LM26480SQX-AA Datasheet(PDF) 6 Page - National Semiconductor (TI) |
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LM26480SQX-AA Datasheet(HTML) 6 Page - National Semiconductor (TI) |
6 / 30 page Symbol Parameter Conditions Min Typ Max Units C OUT Output Capacitor Capacitance for stability 0°C ≤ T J ≤ 125°C 0.33 0.47 µF −40°C ≤ T J ≤ 125°C 0.68 1.0 µF ESR (Equivalent Series Resistance) 5 500 m Ω Buck Converters SW1, SW2 Unless otherwise noted, V IN = 3.6V, CIN = 10 µF, COUT = 10 µF, LOUT = 2.2 µH. Typical values and limits appearing in normal type apply for T J = 25°C. Limits appearing in boldface type apply over the entire junction temperature range for operation, −40°C to +125°C. ((Note 2, Note 7, Note 8, Note 9, Note 11, Note 14) Symbol Parameter Conditions Min Typ Max Units V FB (Note 14) Feedback Voltage −3 +3 % V OUT Line Regulation 2.8 < V IN < 5.5 I O =10 mA 0.089 %/V Load Regulation 100 mA < I O < IMAX 0.0013 %/mA Eff Efficiency Load Current = 250 mA 96 % I SHDN Shutdown Supply Current EN is de-asserted 0.01 1 µA f OSC Internal Oscillator Frequency 2.0 2.4 MHz I PEAK Buck1 Peak Switching Current Limit 2.0 2.4 A Buck2 Peak Switching Current Limit 2.0 2.4 I Q Quiescent Current “On” No load PFM Mode 33 µA R DSON (P) Pin-Pin Resistance PFET 200 400 m Ω R DSON (N) Pin-Pin Resistance NFET 180 400 m Ω T ON Turn On Time Start up from shut-down 500 µsec C IN Input Capacitor Capacitance for stability 10 µF C O Output Capacitor Capacitance for stability 10 µF I/O Electrical Characteristics Unless otherwise noted: Typical values and limits appearing in normal type apply for T J = 25°C. Limits appearing in boldface type apply over the entire junction temperature range for operation, T J = 0°C to +125°C. Symbol Parameter Conditions Limit Units Min Max V IL Input Low Level 0.4 V V IH Input High Level 0.7*VDD V Power On Reset Threshold/Function (POR) Symbol Parameter Conditions Min Typ Max Units nPOR nPOR = Power on reset for Buck1 and Buck2 Default 60 msec nPOR Threshold Percentage of Target voltage Buck1 or Buck2 V BUCK1 AND VBUCK2 rising 92 % V BUCK1 OR VBUCK2 falling 82 V OL Output Level Low Load = I OL = 500 µA 0.23 0.5 V www.national.com 6 |
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