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LP3905 Datasheet(PDF) 5 Page - National Semiconductor (TI) |
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LP3905 Datasheet(HTML) 5 Page - National Semiconductor (TI) |
5 / 15 page General Electrical Characteristics (Notes 2, 8, 9) (Continued) Buck Regulator Electrical Characteristics Buck1&2 have a current rating of I max= 600mA. Unless otherwise specified, limits are set with VIN =VEN1/2 = 3.8V, VOUT- (Buck1) = Vnom1 , V OUT(Buck2)= Vnom2 and CIN=COUT=10µF. Limits in standard typeface are for TJ = 25˚C. Limits in boldface type apply over the full junction temperature range (−40˚C ≤ T J ≤ +125˚C). Unless otherwise noted, specifications apply to the LP3905 Typical Application Circuit (Figure. 1) (Notes 2, 8) Symbol Parameter Condition Min Typ Max Units V FB Feedback Voltage (Note 16) -4 +4 % V OUT Line Regulation 3.0V ≤ V IN ≤ 5.5V I O = 1mA 0.045 %/V Load Regulation 100 mA ≤ I O ≤ 600mA 0.002 %/mA R DSON (P) Pin-Pin Resistance for PFET V IN=VGS= 3.6V 380 500 m Ω R DSON (N) Pin-Pin Resistance for NFET V IN=VGS= 3.6V (Note 15) 250 400 m Ω I LIM Switch Peak Current Limit Open Loop 650 1000 1220 mA F OSC Internal Oscillator Frequency PWM Mode 2 MHz η Efficiency IOUT = 5mA, PFM mode (Note 15) 88 % IOUT = 300mA, PWM mode (Note 15) 90 LDO Regulator Electrical Characteristics The linear regulators have a current rating of I max= 150mA with COUT = 1.0µF. A 100mA rating applies with COUT = 0.47µF. Unless otherwise specified, limits are set with V IN = 3.8V, VEN1/2 = 3.8V, CIN = 1µF, COUT = 0.47µF, IOUT = 1.0mA. Limits in standard typeface are for T J = 25˚C. Limits in boldface type apply over the full junction temperature range (−40˚C ≤ T J ≤ +125˚C). Unless otherwise noted, specifications apply to the LP3905 Typical Application Circuit (Figure. 1)(Notes 2, 8) Symbol Parameter Conditions Min Typ Max Units ∆V OUT Output Voltage Tolerance Over Full Line and Load Regulation −3 3 % Line Regulation Error V IN = 3.8V to 5.5V, I OUT = 1mA 0.05 %/V Load Regulation Error I OUT = 1 mA to 100mA 0.003 %/mA I LOAD Load Current (Notes 11, 15) 0 mA V DO Dropout Voltage I OUT = 100mA 80 150 mV I SC Short Circuit Current Limit (Note 13) 300 500 mA I OUT Maximum Output Current C OUT = 1.0µF 150 mA PSRR Power Supply Rejection Ratio (Note 15) f = 100Hz, I OUT = 100mA 90 dB f = 1kHz, I OUT = 100mA 90 f = 10kHz, I OUT = 100mA 60 f = 50kHz, I OUT = 100mA 35 f = 100kHz, I OUT = 100mA 25 e n Output Noise Voltage (Note 15) BW = 10Hz to 100kHz, V IN = 4.2V Buck1 Turned ON with I LOAD= 0mA, Buck2 Turned OFF I OUT = 1mA 13.5 µV RMS I OUT = 100mA 15.5 www.national.com 5 |
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