LTC1980 ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operatingtemperature range, otherwise specifications are at TA = 25 ° C.VBAT = 2.4V, VREG = 5V, VBAT unloaded.SYMBOLPARAMETERCONDITIONSMINTYPMAXUNITS VP2 Digital Input Pull-Up Voltage, BATT1 BATT1 Input Floating 1.6 V VIL3 Digital Input Low Voltage, BATT2 0.3 V VIH3 Digital Input High Voltage, BATT2 2 V II1 Digital Input Current, WA –5 5 µA II2 Digital Input Current, BATT1 –10 10 µA II3 Digital Input Current, BATT2 –1 1 µA Note 1: Absolute Maximum Ratings are those values beyond which the life temperature range are assured by design, characterization and correlation of a device may be impaired. with statistical process controls. Note 2: The LTC1980E is guaranteed to meet performance specifications Note 3: TA = 0°C to 70°C. from 0°C to 70°C. Specifications over the –40°C to 85°C operating WUTYPICAL PERFOR A CE CHARACTERISTICSFeedback Reference VoltageSwitching Frequency Variancevs Temperaturevs TemperatureRegulator Load Regulation 1.2240 1.5 0 VBAT = 4.2V V 1.2235 REG ≅ 3.3V 1.0 –0.2 TA = 25°C FIGURE 5 1.2230 0.5 –0.4 1.2225 (%) 0 –0.6 REG 1.2220 V ∆ –0.5 –0.8 1.2215 FREQUENCY VARIANCE (%) –1.0 –1.0 FEEDBACK REFERENCE VOLTAGE (V) 1.2210 1.2205 –1.5 –1.2 –40 –15 10 35 60 85 –40 –15 10 35 60 85 0 100 200 300 400 500 TEMPERATURE (°C) TEMPERATURE (°C) LOAD CURRENT (mA) 1980 G01 1980 G02 1980 G03 3.3V Regulator Efficiency5V Regulator Efficiencyvs Load Currentvs Load CurrentRegulator Load Step Response 90 90 85 85 VREG 50mV/DIV 80 80 75 75 IL EFFICIENCY (%) 70 EFFICIENCY (%) 70 500mA/DIV VBAT = 3.6V 1980 G06 65 V V 100 BAT = 3.6V µs/DIV BAT = 3.6V 65 TA = 25°C T VREG ≅ 3.3V A = 25°C R8 = 309k I FIGURE 5 FIGURE 5 L = 100mA TO 500mA 60 60 TA = 25°C 10 100 1000 10 100 1000 FIGURE 5 LOAD CURRENT (mA) LOAD CURRENT (mA) 1980 G04 1980 G05 1980f 4
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