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LTC3550 Datasheet(PDF) 3 Page - Linear Technology |
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LTC3550 Datasheet(HTML) 3 Page - Linear Technology |
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3 / 24 page  LTC3550 3 3550fa SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Battery Charger IDCIN DCIN Supply Current Charge Mode (Note 5) Standby Mode Shutdown Mode RIDC = 10k Charge Terminated ENABLE = 5V ● ● 250 50 20 800 100 40 µA µA µA IUSBIN USBIN Supply Current Charge Mode (Note 6) Standby Mode Shutdown Mode Shutdown Mode RIUSB = 10k, VDCIN = 0V Charge Terminated VDCIN = 0V, ENABLE = 0V VDCIN > VUSBIN ● ● 250 50 18 10 800 100 36 20 µA µA µA µA VFLOAT Regulated Output (Float) Voltage IBAT = 1mA IBAT = 1mA, 0°C < TA < 85°C 4.175 4.158 4.2 4.2 4.225 4.242 V V IBAT BAT Pin Current Constant-Current Mode Constant-Current Mode Constant-Current Mode Standby Mode Shutdown Mode Sleep Mode RIDC = 1.25k RIUSB = 2.1k RIDC = 10k or RIUSB = 10k Charge Terminated Charger Disabled DCIN = 0V, USBIN = 0V ● ● ● 760 450 93 800 476 100 –3 –1 ±1 840 500 107 –6 –2 ±2 mA mA mA µA µA µA VIDC IDC Pin Regulated Voltage Constant-Current Mode 0.95 1.0 1.05 V VIUSB IUSB Pin Regulated Voltage Constant-Current Mode 0.95 1.0 1.05 V ITERMINATE Charge Current Termination Threshold RITERM = 1k RITERM = 2k RITERM = 10k RITERM = 20k ● ● ● ● 90 45 8.5 4 100 50 10 5 110 55 11.5 6 mA mA mA mA ITRIKL Trickle Charge Current VBAT < VTRIKL; RIDC = 1.25k VBAT < VTRIKL; RIUSB = 2.1k 60 30 80 47.5 100 65 mA mA VTRIKL Trickle Charge Threshold Voltage VBAT Rising Hysteresis 2.8 2.9 100 3V mV 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 9 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 (Between DCIN and BAT) 400 m Ω RON-USB Power FET On-Resistance (Between USBIN and BAT) 550 m Ω TLIM Junction Temperature in Constant- Temperature Mode 105 °C Switching Regulator VFB Regulated Feedback Voltage TA = 25°C 0°C ≤ TA ≤ 85°C –40°C ≤ TA ≤ 85°C ● 0.5880 0.5865 0.5850 0.6 0.6 0.6 0.6120 0.6135 0.6150 V V V ΔVFB Reference Voltage Line Regulation ● 0.04 0.4 %/V IPK Peak Inductor Current VCC = 3V, VFB = 0.5V 0.75 1 1.25 A VLOADREG Output Voltage Load Regulation 0.5 % The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VDCIN = 5V, VUSBIN = 5V, VCC = 3.6V unless otherwise noted. ELECTRICAL CHARACTERISTICS |
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