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LTC4077 Datasheet(PDF) 3 Page - Linear Technology |
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LTC4077 Datasheet(HTML) 3 Page - Linear Technology |
3 / 16 page LTC4077 3 4077fa SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS IC/2 Charge Current Termination Threshold HPWR = 0V (Note 8) ● 0.45 0.5 0.55 mA/mA ITRIKL Trickle Charge Current VBAT < VTRIKL; RIDC = 1.25k 60 80 100 mA VBAT < VTRIKL; RIUSB = 2.1k 30 47.5 65 mA VBAT < VTRIKL; RIUSBL = 4k 17 25 33 mA VTRIKL Trickle Charge Threshold Voltage VBAT Rising 2.8 2.9 3 V Hysteresis 100 mV VUVDC DCIN Undervoltage Lockout Voltage From Low to High 4 4.15 4.3 V Hysteresis 200 mV VUVUSB USBIN Undervoltage Lockout Voltage From Low to High 3.8 3.95 4.1 V Hysteresis 200 mV VASD-DC VDCIN – VBAT Lockout Threshold VDCIN from Low to High, VBAT = 4.2V 140 180 220 mV VDCIN from High to Low, VBAT = 4.2V 20 50 80 mV VASD-USB VUSBIN – VBAT Lockout Threshold VUSBIN from Low to High 140 180 220 mV VUSBIN from High to Low 20 50 80 mV VEN EN Input Threshold Voltage 0.4 0.7 1 V REN EN Pulldown Resistance ● 1 2 5 MΩ VHPWR HPWR Input Threshold Voltage 0.4 0.7 1 V RHPWR HPWR Pulldown Resistance ● 1 2 5 MΩ VCHRG CHRG Output Low Voltage ICHRG = 5mA 0.35 0.6 V VPWR PWR Output Low Voltage IPWR = 5mA 0.35 0.6 V ΔVRECHRG Recharge Battery Threshold Voltage VFLOAT – VRECHRG, 0°C < TA < 85°C 65 100 135 mV tRECHRG Recharge Comparator Filter Time VBAT from High to Low 3 6 10 ms tTERMINATE Termination Comparator Filter Time IBAT Drops Below Termination Threshold 0.8 1.5 2.2 ms tSS Soft-Start Time IBAT = 10% to 90% Full-Scale 175 250 325 µs RON-DC Power FET “ON” Resistance 400 mΩ (Between DCIN and BAT) RON-USB Power FET “ON” Resistance 550 mΩ (Between USBIN and BAT) TLIM Junction Temperature in 105 °C Constant-Temperature Mode The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VDCIN = 5V, VUSBIN = 5V, HPWR = 5V unless otherwise noted. 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 LTC4077E is guaranteed to meet the 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: Failure to correctly solder the exposed backside of the package to the PC board will result in a thermal resistance much higher than 40°C/W. See Thermal Considerations. Note 4: Supply current includes IDC pin current (approximately 100µA) but does not include any current delivered to the battery through the BAT pin. Note 5: Supply current includes IUSB and IUSBL pin currents (approximately 100µA each) but does not include any current delivered to the battery through the BAT pin. Note 6: Guaranteed by long term current density limitations. Note 7: IC/10 is expressed as a fraction of measured full charge current. Note 8: IC/2 is expressed as a fraction of measured full charge current. Note 9: VCC is greater of DCIN or USBIN. ELECTRICAL CHARACTERISTICS |
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