Datasheet LTC4040 (Analog Devices) - 3

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 570 µA Shutdown (BSTOFF = CHGOFF=1) 3.5 7 µA IBATQ BAT Quiescent Current Normal Mode (VPFI = 2V), Battery Charger Timed Out 45 µA Backup Mode (VIN = VPFI = 0V), No System Load l 40 70 µA Shutdown (BSTOFF = CHGOFF = 1) 1.5 3 µA
Battery Charger
VCHG BAT Regulated Output Voltage for LiFePO4 F2 = 0, F1 = 0, F0 = 0 l 3.42 3.45 3.48 V Option (F2 = 0) F2 = 0, F1 = 0, F0 = 1 l 3.47 3.50 3.53 V F2 = 0, F1 = 1, F0 = 0 l 3.52 3.55 3.58 V F2 = 0, F1 = 1, F0 = 1 l 3.57 3.60 3.63 V BAT Regulated Output Voltage for Li-Ion F2 = 1, F1 = 0, F0 = 0 l 3.92 3.95 3.98 V Option (F2 = 1) F2 = 1, F1 = 0, F0 = 1 l 3.97 4.00 4.03 V F2 = 1, F1 = 1, F0 = 0 l 4.02 4.05 4.08 V F2 = 1, F1 = 1, F0 = 1 l 4.07 4.10 4.13 V ICHG Regulated Battery Charge Current RPROG = 2k 950 1000 1050 mA VSYS-to-VBAT Differential Undervoltage 40 50 60 mV Lockout Threshold (Falling) VSYS-to-BAT Differential Undervoltage 125 145 165 mV Lockout Threshold (Rising) 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 94.2 95 95.8 % Threshold Voltage Relative to VCHG All Other Cases 96.7 97.5 98.3 % tTERMINATE Safety Timer Termination Period Timer Starts When VBAT = VCHG F2 = 1 (Li-Ion) 3.7 4.25 5 Hours F2 = 0 (LiFePO4) 1.85 2.13 2.5 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 Normal Mode (VPFI > 1.21V) 1.96 2.25 2.65 MHz Frequency 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 4040fb For more information www.linear.com/LTC4040 3 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Application Package Description Revision History Typical Application Related Parts