Datasheet LTC4040 (Analog Devices) - 7

LTC4040
Typical perForMance characTerisTics TA = 25°C, unless otherwise noted. Li–Ion Battery Charging Profile Li-Ion Battery Charging Profile LiFePO4 Battery Charging Profile
4.20 1200 3.7 1200 V 4.00 BAT 1000 3.6 1000 CHARGE CURRENT (mA) CHARGE CURRENT (mA) 3.80 800 3.5 800 TAGE (V) TAGE (V) 3.60 600 3.4 600 Y VOL IBAT Y VOL TTER 3.40 VSYS = 5V 400 VSYS = 5V TTER 3.3 400 BA RPROG = 2k RPROG = 2k BA F2 = F1 = F0 = 1 F2 = 0, F1 = F0 = 1 3.20 200 3.2 200 3.00 0 3.1 0 0 1 2 3 4 5 6 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 TIME (h) TIME (h) 4040 G10 4040 G11
Charge Current Reduction Due to Charge Current Reduction Due to Normal to Backup Mode Input Current Limit Set by RS Input Current Limit Set by R Transition W T aveform (Li–Ion) aveform (Li-Ion)
2500 6 12 TOTAL INPUT CURRENT VSYS 5 10 2000 VBAT = 3.6V V V SYS = 5V 4 IN ISYS = 1A 8 R CURRENT (A) PROG = 2k RPROG = 2k 1500 RS = 12 mΩ CSYS = 100µF 3 6 IBAT TAGE (V) 1000 2 4 CURRENT (mA) VOL IBAT 1 2 500 0 0 0 –1 –2 0 500 1000 1500 2000 2500 –500 –250 0 250 500 750 1000 SYSTEM LOAD CURRENT (mA) TIME (µs) 4040 G12 4040 G13
Backup to Normal Mode Backup to Normal Mode PROG Voltage Transient Response oltage Transient Response Transition W T aveform ransition W to System Step Load by System Step Load
6 6 1.5 6 VBAT = 3.7V 5 VSYS 5 1.0 RPROG = 2k 5 V R PROG S = 12mΩ VBAT = 3.7V 4 R 4 PROG = 2k 0.5 4 CURRENT (A) I CURRENT (A) SYS = 1A 3 3 0.0 3 TAGE (V) TAGE (V) ISYS 2 2 –0.5 2 VOL IBAT IBAT 1 1 PROG VOL –1.0 1 V ZERO 0 IN 0 –1.5 0 –1 –1 –2.0 –1 –200–100 0 100 200 300 400 500 600 700 0 200 400 600 800 1000 1200 TIME (ms) TIME (µs) 4040 G14 4040 G15 4040fb For more information www.linear.com/LTC4040 7 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