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LP3971 数据表(PDF) 9 Page - National Semiconductor (TI) |
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LP3971 数据表(HTML) 9 Page - National Semiconductor (TI) |
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9 / 42 page  LDO1to5 Unless otherwise noted, V IN = 3.6V, CIN = 1.0 µF, COUT = 0.47 µF, COUT (VRTC) = 1.0 µF ceramic. 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. (Notes 2, 6, 7, 10, 11, 15) and (Note 16). Symbol Parameter Conditions Min Typ Max Units V OUT Accuracy Output Voltage Accuracy (Default V OUT) Load Current=1mA −3 3 % ∆V OUT Line Regulation V IN =3.1v to 5.0V, (Note 11) Load Current=1mA 0.15 %/V Load Regulation V IN = 3.6V, Load Current=1mAtoI MAX 0.011 %/mA I SC Short Circuit Current Limit LDO1–4, V OUT = 0V 400 mA LDO5, V OUT = 0V 500 V IN - V OUT Dropout Voltage Load Current = 50 mA (Note 7) 150 mV PSRR Power Supply Ripple Rejection f = 10 kHz, Load Current = I MAX 45 dB I Q Quiescent Current “On” I OUT =0mA 40 µA Quiescent Current “On” I OUT =IMAX 60 Quiescent Current “Off” EN is de-asserted 0.03 T ON Turn On Time Start up from Shut-down 300 µsec 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 ESR 5 500 M Ω Buck Converters SW1, SW2, SW3 Unless otherwise noted, V IN = 3.6V, CIN = 10 µF, COUT = 10 µF, LOUT = 2.2 µH ceramic. 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 opera- tion, −40˚C to +125˚C. (Notes 2, 6, 12) and (Note 13). Symbol Parameter Conditions Min Typ Max Units V OUT Output Voltage Accuracy Default V OUT −3 +3 % Eff Efficiency Load Current = 500 mA 90 % I SHDN Shutdown Supply Current EN is de-asserted 0.1 µA Sync Mode Clock Frequency Synchronized from 13 MHz System Clock 10.4 13 15.6 MHz f OSC Internal Oscillator Frequency 2.0 MHz I PEAK Peak Switching Current Limit 2.1 2.4 A I Q Quiescent Current “On” No Load PFM Mode 21 µA No Load PWM Mode 200 R DSON (P) Pin-Pin Resistance PFET 240 m Ω R DSON (N) Pin-Pin Resistance NFET 150 m Ω T ON Turn On Time Start up from Shut-down 500 µsec C IN Input Capacitor Capacitance for Stability 8 µF C O Output Capacitor Capacitance for Stability 8 µF www.national.com 9 |
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