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LTC3672B-1 3 3672B1f ELECTRICAL CHARACTERISTICS Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: The LTC3672B-1 is guaranteed to meet performance specifications from 0°C to 85°C. Specifications over the –40°C to 85°C operating temperature range are assured by design, characterization and correlation with statistical process controls. Note 3: This IC includes overtemperature protection that is intended to protect the device during momentary overload conditions. Junction temperature will exceed 125°C when overtemperature protection is active. Continuous operation above the specified maximum operating junction temperature may impair device reliability. The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 3.6V, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS RPD,BUCKOUT BUCKOUT Pulldown Resistance in Shutdown VENALL = 0V 10 k Ω RPD,SW SW Pulldown Resistance in Shutdown VENALL = 0V 10 k Ω tSS,BUCK Soft-Start Time 0.2 ms LDO Regulator 1: VIN1 = 1.8V Unless Otherwise Noted VLDO1 Regulated Output Voltage LDO1 Output, ILDO1 = 1mA ● 1.17 1.2 1.23 V Line Regulation with Respect to VIN with Respect to VIN1 ILDO1 = 1mA VIN = 3V to 5.5V, VIN1 = 1.8V VIN = 3.6V, VIN1 = 1.7V to 1.9V 0.05 1 mV/V mV/V Load Regulation ILDO1 = 1mA to 150mA –0.05 mV/mA Available Output Current 150 mA Short-Circuit Output Current 347 mA VDROP1 Dropout Voltage (Note 6) ILDO1 = 150mA 484 570 mV tSS,LDO1 Soft-Start Time 0.3 ms RPD,LDO1 Output Pulldown Resistance in Shutdown 10 k Ω LDO Regulator 2 VLDO2 Regulated Output Voltage LDO2 Output, ILDO2 = 1mA ● 2.73 2.8 2.87 V Line Regulation with Respect to VIN ILDO2 = 1mA, VIN = 3V to 5.5V 1 mV/V Load Regulation ILDO2 = 1mA to 150mA 0.1 mV/mA Available Output Current 150 mA Short-Circuit Output Current 453 mA VDROP2 Dropout Voltage (Note 6) ILDO2 = 150mA 188 250 mV tSS,LDO2 Soft-Start Time 0.1 ms RPD,LDO2 Output Pulldown Resistance in Shutdown 10 k Ω Note 4: Dynamic supply current is higher due to the gate charge delivered to the buck regulator’s internal MOSFET switches at the switching frequency. Note 5: The current limit features of this part are intended to protect the IC from short term or intermittent fault conditions. Continuous operation above the specified maximum specified pin current rating may result in device degradation or failure. Note 6: Dropout voltage is the minimum input to output voltage differential needed to maintain regulation at a specified output current. When LDO1 is in dropout, its output voltage will be equal to: VIN1 – VDROP1. When LDO2 is in dropout, its output voltage will be equal to: VIN – VDROP2. |
