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LTC4040 Datasheet(PDF) 3 Page - Linear Technology |
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LTC4040 Datasheet(HTML) 3 Page - Linear Technology |
3 / 26 page LTC4040 3 4040fa For more information www.linear.com/LTC4040 elecTrical characTerisTics The l denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C. (Note 3) VIN = 5V, VBAT = 3.6V, RPROG = 2k, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS VIN Input Voltage Range l 3.5 5.5 V VBAT Battery Voltage Range (Backup Boost Input) 2.7 5 V IINQ VIN Quiescent Current Normal Mode (VPFI = 2V), Battery Charger Timed Out Shutdown (BSTOFF = CHGOFF=1) 570 3.5 7 µA µA IBATQ BAT Quiescent Current Normal Mode (VPFI = 2V), Battery Charger Timed Out Backup Mode (VIN = VPFI = 0V), No System Load Shutdown (BSTOFF = CHGOFF = 1) l 45 40 1.5 70 3 µA µA µA Battery Charger VCHG BAT Regulated Output Voltage for LiFePO4 Option (F2 = 0) F2 = 0, F1 = 0, F0 = 0 F2 = 0, F1 = 0, F0 = 1 F2 = 0, F1 = 1, F0 = 0 F2 = 0, F1 = 1, F0 = 1 l l l l 3.42 3.47 3.52 3.57 3.45 3.50 3.55 3.60 3.48 3.53 3.58 3.63 V V V V BAT Regulated Output Voltage for Li-Ion Option (F2 = 1) F2 = 1, F1 = 0, F0 = 0 F2 = 1, F1 = 0, F0 = 1 F2 = 1, F1 = 1, F0 = 0 F2 = 1, F1 = 1, F0 = 1 l l l l 3.92 3.97 4.02 4.07 3.95 4.00 4.05 4.10 3.98 4.03 4.08 4.13 V V V V ICHG Regulated Battery Charge Current RPROG = 2k 950 1000 1050 mA VSYS-to-VBAT Differential Undervoltage Lockout Threshold (Falling) 40 50 60 mV VSYS-to-BAT Differential Undervoltage Lockout Threshold (Rising) 125 145 165 mV VPROG PROG Pin Servo Voltage 800 mV hPROG Ratio of Battery Current to PROG Pin Current 2500 mA/ mA ITRKL Trickle Charge Current VBAT = 2.5V, RPROG = 2k 125 mA PROG Pin Servo Voltage at Trickle Charge VBAT = 2.5V, RPROG = 2k 100 mV Input Current Limit Threshold Voltage VIN – VCLN l 23.5 25 26.5 mV ACLPROG Input Current Limit Amplifier Gain Ratio of CLPROG Voltage to (VIN – VCLN) 32 V/V CLN Input Bias Current VCLN = VIN 300 nA VRECHG Recharge Battery Threshold Voltage Threshold Voltage Relative to VCHG if F2 = 0 and F1 = 1 Threshold Voltage Relative to VCHG All Other Cases 94.2 96.7 95 97.5 95.8 98.3 % % tTERMINATE Safety Timer Termination Period Timer Starts When VBAT = VCHG F2 = 1 (Li-Ion) F2 = 0 (LiFePO4) 3.7 1.85 4.25 2.13 5 2.5 Hours Hours VLOWBAT Low Battery Threshold Voltage for Trickle Charge VBAT Rising 2.75 2.85 2.95 V �VLOWBAT Low Battery Hysteresis 150 mV tBADBAT Bad-Battery Termination Time VBAT < (VLOWBAT − ΔVLOWBAT) 0.47 0.54 0.64 Hours VC/8 End-of-Charge Indication PROG Pin Average Voltage 90 100 110 mV fOSC(BUCK) Step-Down (Buck) Converter Switching Frequency Normal Mode (VPFI > 1.21V) 1.96 2.25 2.65 MHz RP(BUCK) High Side Switch On-Resistance Normal Mode (VPFI > 1.21V) 130 mΩ RN(BUCK) Low Side Switch On-Resistance Normal Mode (VPFI > 1.21V) 120 mΩ ILIM(BUCK) PMOS Switch Current Limit 3 4.3 A |
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