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LTC3552 Datasheet(PDF) 3 Page - Linear Technology |
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LTC3552 Datasheet(HTML) 3 Page - Linear Technology |
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3 / 24 page  LTC3552 3 3552f SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS V⎯E⎯N(IL) ⎯E⎯N Pin Input Low Voltage ● 0.4 0.7 V V⎯E⎯N(IH) ⎯E⎯N Pin Input High Voltage ● 0.7 1 V R⎯E⎯N ⎯EN Pin Pull-Down Resistor ● 1.2 2 5 MΩ VASD VIN – VBAT Lockout Threshold Voltage VIN from Low to High VIN from High to Low 70 5 100 30 140 50 mV mV ITERM Charge Termination Current Threshold RTERM = 1k RTERM = 5k ● ● 90 17.5 100 20 110 22.5 mA mA VPROG PROG Pin Voltage RPROG = 10k, Current Mode 0.93 1 1.07 V V⎯C⎯H⎯R⎯G ⎯C⎯H⎯R⎯G Pin Output Low Voltage I⎯C⎯H⎯R⎯G = 5mA 0.35 0.6 V V⎯P⎯W⎯R ⎯P⎯W⎯R Pin Output Low Voltage I⎯P⎯W⎯R = 5mA 0.35 0.6 V ΔVRECHRG Recharge Battery Threshold Voltage VFLOAT – VRECHRG, 0°C < TA < 85°C 60 100 140 mV TLIM Junction Temperature in Constant- Temperature Mode 120 °C RON-CHRG Charger’s Power FET On-Resistance (Between VIN and BAT) 600 mΩ tSS-CHRG Charger Soft-Start Time IBAT = 0 to IBAT = 1000V/RPROG 100 µs tRECHRG Recharge Comparator Filter Time VBAT High to Low 0.75 2 4.5 ms tTERM Termination Comparator Filter Time IBAT Drops Below Charge Termination Threshold 0.4 1 2.5 ms Switching Regulator VCC Operating Voltage Range for Regulator ● 2.5 5.5 V IFB Feedback Pin Input Current ● 30 nA VFB Feedback Voltage (Note 5) 0°C ≤ TA ≤ 85°C –40°C ≤ TA ≤ 85°C ● 0.588 0.585 0.6 0.6 0.612 0.612 V V ΔVLINE_REG Reference Voltage Line Regulation VCC = 2.5V to 5.5V (Note 5) 0.3 0.5 %/V ΔVLOAD_REG Output Voltage Load Regulation (Note 5) 0.5 % IS Input DC Supply Current Active Mode Sleep Mode Shutdown VFB1 = VFB2 = 0.5V VFB1 = VFB2 = 0.63V, MODE/SYNC = 3.6V RUN = 0V, VCC = 5.5V, MODE/SYNC = 0V 700 40 0.1 950 60 1 µA µA µA fOSC Oscillator Frequency VFB = 0.6V ● 1.8 2.25 2.7 MHz fSYNC Synchronization Frequency 2.25 MHz ILIM Peak Switch Current Limit Regulator 1 Peak Switch Current Limit Regulator 2 VCC = 3V, VFB = 0.5V, Duty Cycle < 35% VCC = 3V, VFB = 0.5V, Duty Cycle < 35% 0.95 0.6 1.2 0.7 1.6 0.9 A A RDS(ON) Top Switch On-Resistance Bottom Switch On-Resistance (Note 6) (Note 6) 0.35 0.30 0.45 0.45 Ω Ω ISW(LKG) Switch Leakage Current VCC = 5V, VRUN = 0V, VFB = 0V 0.01 1 µA POR Power-On Reset Threshold VFB Ramping Down, MODE/SYNC = 0V –8.5 % Power-On Reset On-Resistance 100 200 Ω Power-On Reset Delay 262,144 Cycles VRUN RUN Threshold Voltage ● 0.3 1 1.5 V IRUN RUN Leakage Current ● 0.01 1 µA The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 5V, VCC = 3.6V unless otherwise noted. ELECTRICAL CHARACTERISTICS |
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