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LTC4040 Datasheet(PDF) 3 Page - Analog Devices |
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LTC4040 Datasheet(HTML) 3 Page - Analog Devices |
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3 / 26 page  LTC4041 3 Rev A For more information www.analog.com The l denotes the specifications which apply over the specified operating temperature range, otherwise specifications are at TA = 25°C. (Note 3) VIN = VSYS = 5V, VSCAP = 2.5V, RPROG = 2k, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS VIN Input Voltage Range l 2.9 5.5 V VSCAP Supercapacitor Voltage Range (Backup Boost Input) l 5.4 V Quiescent Current in Charger Mode with Charging Complete and Backup Boost Active (CAPSEL = 1) VIN and VSYS Total Quiescent Current 800 1600 µA SCAP Quiescent Current 13 26 µA Quiescent Current in Charger Mode with Charging Complete and Backup Boost in Sleep (CAPSEL = 1) VIN and VSYS Total Quiescent Current 275 550 µA SCAP Quiescent Current 13 26 µA Quiescent Current in Backup Mode with Backup Boost in Sleep (VIN = 0V, CAPSEL = 1) VSYS Quiescent Current l 75 150 µA SCAP Quiescent Current l 1 2 µA Quiescent Current in Shutdown (CHGEN = BSTEN = CAPSEL = 1, VSYS = 0V) VIN Quiescent Current 5.5 11 µA SCAP Quiescent Current l 0 1 µA Buck Supercapacitor Charger VCAPFB CAPFB Pin Servo Voltage l 0.788 0.80 0.812 V ICAPFB CAPFB Pin Input Leakage Current –50 0 50 nA ICHG Regulated Supercapacitor Charge Current RPROG = 2k, VSCAP >1V 950 1000 1050 mA VSYS-to-VSCAP Differential Undervoltage Lockout Threshold (VSYS – VSCAP) Falling (VSYS – VSCAP) Rising 30 100 50 150 70 200 mV mV VPROG PROG Pin Servo Voltage 800 mV hPROG Ratio of Charge Current to PROG Pin Current 2500 mA/mA Input Current Limit Threshold Voltage VIN – VCLN l 23.5 22 25 25 26.5 28 mV mV AIMON Input Current Limit Amplifier Gain Ratio of VIMON to (VIN – VCLN) 32 V/V CLN Input Bias Current VCLN = VIN 300 nA VRECHRG Recharge Threshold Voltage As a Percentage of the Regulated VSCAP 96.2 97.5 98.8 % End-of-Charge Indication PROG Pin Average Voltage 100 mV CAPGD Rising Threshold As a Percentage of the Regulated VSCAP 90 92.5 95 % Hysteresis As a Percentage of the Regulated VSCAP 2.5 % fOSC(BUCK) Step-Down Converter Switching Frequency VSCAP>1V 2.0 2.25 2.5 MHz RP(BUCK) High Side Switch On-Resistance 130 mΩ RN(BUCK) Low Side Switch On-Resistance 120 mΩ ILIM(BUCK) PMOS Switch Current Limit 3 4.3 A Supercapacitor Balancer VBAL Supercapacitor Balance Point As a Percentage of VSCAP, VSCAP = 5V 49 50 51 % ISOURCE Balancer Source Current VSCAP = 5V, VBAL = 2.4V 50 mA ISINK Balancer Sink Current VSCAP = 5V, VBAL = 2.6V 50 mA Top/Bottom Supercapacitor Overvoltage Threshold (VSCAP – VBAL) and/or VBAL Rising, CAPSEL = 1 l 2.7 2.8 V Hysteresis 55 mV Top/Bottom Supercapacitor Undervoltage Threshold (VSCAP – VBAL) and/or VBAL Falling, CAPSEL = 1 l –50 –20 mV Hysteresis 30 mV ELECTRICAL CHARACTERISTICS |
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