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LTC3557 Datasheet(PDF) 3 Page - Linear Technology |
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LTC3557 Datasheet(HTML) 3 Page - Linear Technology |
3 / 28 page LTC3557/LTC3557-1 3 35571fc POWER MANAGER ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VBUS = 5V, VBAT = 3.8V, ILIM0 = ILIM1 = 5V, WALL = EN1 = EN2 = EN3 = 0V, RPROG = 2k, RCLPROG = 2.1k. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS VDUVLO VBUS to VOUT Differential Undervoltage Lockout Rising Threshold Falling Threshold 50 −50 100 mV mV RON_LIM Input Current Limit Power FET On-Resistance (Between VBUS and VOUT) 0.2 Ω Battery Charger VFLOAT VBAT Regulated Output Voltage LTC3557 LTC3557, 0°C ≤ TA ≤ 85°C LTC3557-1 LTC3557-1, 0°C ≤ TA ≤ 85°C 4.179 4.165 4.079 4.065 4.200 4.200 4.100 4.100 4.221 4.235 4.121 4.135 V V V V ICHG Constant Current Mode Charge Current RPROG = 1k, Input Current Limit = 2A RPROG = 2k, Input Current Limit = 1A RPROG = 5k, Input Current Limit = 400mA ● ● ● 950 465 180 1000 500 200 1050 535 220 mA mA mA IBAT Battery Drain Current VBUS > VUVLO, Charger Off, IOUT = 0μA VBUS = 0V, IOUT = 0μA (Ideal Diode Mode) 6 55 27 100 μA μA VPROG VPROG(TRKL) PROG Pin Servo Voltage PROG Pin Servo Voltage in Trickle Charge BAT < VTRKL 1.000 0.100 V V hPROG Ratio of IBAT to PROG Pin Current 1000 mA/mA ITRKL Trickle Charge Current BAT < VTRKL 40 50 60 mA VTRKL Trickle Charge Rising Threshold Trickle Charge Falling Threshold BAT Rising BAT Falling 2.5 2.85 2.75 3.0 V V ΔVRECHRG Recharge Battery Threshold Voltage Threshold Voltage Relative to VFLOAT −75 −100 −115 mV tTERM Safety Timer Termination Period Timer Starts when BAT = VFLOAT – 50mV 3.2 4 4.8 Hour tBADBAT Bad Battery Termination Time BAT < VTRKL 0.4 0.5 0.6 Hour hC/10 End-of-Charge Indication Current Ratio (Note 6) 0.085 0.1 0.115 mA/mA RON(CHG) Battery Charger Power FET On-Resistance (Between VOUT and BAT) 200 mΩ TLIM Junction Temperature in Constant Temperature Mode 110 °C NTC VCOLD Cold Temperature Fault Threshold Voltage Rising NTC Voltage Hysteresis 75 76 1.3 77 %VVNTC %VVNTC VHOT Hot Temperature Fault Threshold Voltage Falling NTC Voltage Hysteresis 34 35 1.3 36 %VVNTC %VVNTC VDIS NTC Disable Threshold Voltage Falling NTC Voltage Hysteresis ● 1.2 1.7 50 2.2 %VVNTC mV INTC NTC Leakage Current NTC = VBUS = 5V −50 50 nA Ideal Diode VFWD Forward Voltage Detection IOUT = 10mA 5 15 25 mV RDROPOUT Diode On-Resistance, Dropout IOUT = 1A 200 mΩ IMAX Diode Current Limit (Note 7) 3.6 A Always On 3.3V Supply VLDO3V3 Regulated Output Voltage 0mA < ILDO3V3 < 25mA 3.1 3.3 3.5 V ROL(LDO3V3) Open-Loop Output Resistance BAT = 3.0V, VBUS = 0V 24 Ω RCL(LDO3V3) Closed-Loop Output Resistance 3.2 Ω |
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