BQ25070 Datasheet, PDF (6/21 Pages) Texas Instruments – 1A, Single-Input, Single-Cell LiFePO4 Linear Battery Charger with 50mA LDO

bq25070
SLUSA66 – JULY 2011
www.ti.com
TYPICAL CHARACTERISTICS (continued)
V_IN = 5 V, V_BAT = 3.2 V, I_CHG = 280 mA, Typical Application Circuit
VOLTAGE and CURRENT
vs
ELAPSED TIME
DROPOUT VOLTAGE
vs
TEMPERATURE
4
3.5
3
2.5
2
1.5
1
0.5
0
0:00:00
1.6
1.4
V_BAT
V_CHG
I_BAT 1.2
1
0.8
0.6
0.4
0.2
1:12:00
2:24:00
3:36:00
Elapsed Time (hh:mm:ss)
0
4:48:00
G006
Figure 6. Complete Charge Cycle
1.5
1.4 VIN = 4.5V
1.3 IOUT = 1A
1.2
1.1
1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0
25
50
75
100
Temperature (°C)
Figure 7.
125
G007
BATTERY REGULATION VOLTAGE
vs
CHARGE CURRENT
3.55
3.54
3.53
3.52
3.51
3.5
3.49
3.48
3.47
3.46
3.45
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
Charge Current (A)
G008
Figure 8.
10.6
10.58
10.56
10.54
10.52
10.5
10.48
10.46
10.44
10.42
10.4
0
OVP THRESHOLD
vs
TEMPERATURE
25
50
75
100
Temperature (°C)
Figure 9.
125
G009
1.1
1.05
1
0.95
0.9
0.85
0.8
0.75
0.7
0.65
0.6
0.55
0.5
0.45
0.4
5
CHARGE CURRENT
vs
INPUT VOLTAGE
Thermal
Regulation
6
7
8
9
Input Voltage (V)
10
G010
Figure 10.
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
2.5
INPUT CURRENT LIMIT
vs
BATTERY VOLTAGE
100mA Current Limit
500mA Current Limit
V_IN = 5V
2.75
3
3.25
Battery Voltage (V)
3.5
G011
Figure 11.
6
Copyright © 2011, Texas Instruments Incorporated