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LP3941A Datasheet(PDF) 12 Page - National Semiconductor (TI) |
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LP3941A Datasheet(HTML) 12 Page - National Semiconductor (TI) |
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12 / 32 page  V RTC LDO Electrical Characteristics Unless otherwise noted, 2.5V < V BU_BAT < 3.3V. Typical values and limits appearing in normal type apply for TJ = 25˚C. Limits appearing in boldface type apply over the entire junction temperature range for operation, −40 to +125˚C. (Notes 2, 8, 9) Symbol Parameter Condition Min Typ Max Units V OUT Accuracy Output Voltage I OUT ≤ 50 µA, V OUT = 1.8V 2.15V ≤ V BU-BAT ≤ 3.3V 1.6 1.8 2.0 V I Q Quiescent Current I OUT =6µA 2.6 6 µA I OUT Output Current 2.15V ≤ V BU-BAT ≤ 3.3V 10 50 µA Output Current Limit V OUT =0V 1000 2000 10000 V IN–VRTC Dropout Voltage I OUT =50mA 150 190 mV PSRR Power Supply Ripple Rejection Ratio f = 100 Hz, C OUT = 1.0 µF 20 dB C OUT Output Capacitance Output Capacitor ESR 1mA ≤ I OUT ≤ 200 mA 0.75 1.0 2.2 µF 5 500 m Ω Note: The RTC_LDO can be disabled via the I2C compatible interface by setting the corresponding disable bit. See Table 1 for further details. Back-Up Charger Electrical Characteristics Unless otherwise noted, V IN =VBATT = 3.6V. Typical values and limits appearing in normal type apply for TJ = 25˚C. Limits ap- pearing in boldface type apply over the entire junction temperature range for operation, −40 to +125˚C. (Notes 2, 8, 9) Symbol Parameter Condition Min Typ Max Units V IN Operational Voltage Range V OUT + 0.4 5.5 V V OUT Accuracy Output Voltage I OUT ≤ 50 µA, V OUT = 3.15V V OUT + 0.4 ≤ V BATT ≤ 5.5V 3.0 3.15 3.3 V I Q Quiescent Current I OUT < 50 µA 25 µA I OUT Output Current V OUT + 0.4 ≤ V BATT =VIN ≤ 5.5V, V OUT = 3.0V 70 150 µA Output Current Limit 3.2V ≤ V BATT =VIN ≤ 5.5V V OUT =0V 0.7 1.5 2 mA PSRR Power Supply Ripple Rejection Ratio I OUT ≤ 50 µA, V OUT = 3.15V V OUT + 0.4 ≤ V BATT =VIN ≤ 5.5V f < 10 kHz 15 dB C OUT Output Capacitance Output Capacitor ESR 0µA ≤ I OUT ≤ 100 µA 0.1 µF 5 500 m Ω Note: The back-up battery charger can be disabled by setting the corresponding enable bit ‘0’ via the I2C interface. See Table 1 for further details. Comparators’ Electrical Characteristics Unless otherwise noted, V BATT = +2.5V to 5.5V, VO3 = 3.0V, VCM = 0.27V. 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 to +125˚C. (Notes 2, 8, 9) Symbol Parameter Condition Min Typ Max Units V T Comparator Trip Voltage 230 270 300 mV I B Input Bias Current V INV = 1.3V 0.01 0.15 µA I OS Input Offset Current 1 nA PSRR Power Supply Rejection Ratio 2.7V ≤ V BATT ≤ 5.5V 50 dB V OL Output Voltage Low I SINK = 1 mA 0.24 0.37 V V OH Output Voltage High I SOURCE =1mA 2.57 V O3–0.25 3 V t PLH Propagation Delay Low to High Overdrive = 100 mV (Note 10) 5 µs t PHL Propagation Delay High to Low Overdrive = 100 mV (Note 10) 5 µs t LH Rise Time Low to High Overdrive = 100 mV C OUT = 10 pF (Note 10) 5ns t HL Fall Time High to Low Overdrive = 100 mV C OUT = 10 pF (Note 10) 5ns www.national.com 12 |
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