LT3652 ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operatingtemperature range, otherwise specifications are at TA = 25°C (Note 2). VIN = 20V, Boost – SW = 4V, SHDN = 2V, VFB = 3.3V, CTIMER = 0.68µF. SYMBOLPARAMETERCONDITIONSMINTYPMAXUNITS tTIMER Full Charge Cycle Timeout 3 hr Precondition Timeout 22.5 min Timer Accuracy l –10 10 % fO Operating Frequency 1 MHz DC Duty Cycle Range Continuous Operation l 15 90 % Note 1: Stresses beyond those listed under Absolute Maximum Ratings Note 3: VIN minimum voltages below the start threshold are only may cause permanent damage to the device. Exposure to any Absolute supported if (VBOOST-VSW) > 2V. Maximum Rating condition for extended periods may affect device Note 4: This parameter is valid for programmed output battery float reliability and lifetime. voltages ≤ 4.2V. VIN operating range minimum is 0.75V above the Note 2: The LT3652EDD is guaranteed to meet performance specifications programmed output battery float voltage (VBAT(FLT) + 0.75V). VIN Start from 0°C to 125°C junction temperature. Specifications over the –40°C Voltage is 3.3V above the programmed output battery float voltage to 125°C operating junction temperature range are assured by design, (VBAT(FLT) + 3.3V). characterization, and correlation with statistical process controls. The Note 5: Output battery float voltage (VBAT(FLT)) programming resistor LT3652IDD specifications are guaranteed over the full –40°C to 125°C divider equivalent resistance = 250k compensates for input bias current. operating junction temperature range. Note that the maximum ambient Note 6: All V temperature consistent with these specifications is determined by specific FB voltages measured through 250k series resistance. operating conditions in conjunction with board layout, the rated package Note 7: VSENSE(DC) is reduced by thermal foldback as junction temperature thermal impedance and other environmental factors. approaches 125°C. 3652fe 4 For more information www.linear.com/LT3652 Document Outline Description Typical Application Absolute Maximum Ratings Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Applications Information Package Description Typical Application Related Parts
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