BQ24257 Datasheet, PDF (14/45 Pages) Texas Instruments – 2A Single Input I2C, Standalone Switch-Mode Li-Ion Battery Charger with Integrated Current Sense Resistor

bq24257
bq24258
SLUSBG0B – FEBRUARY 2013 – REVISED JULY 2013
TYPICAL CHARACTERISTICS
.
Battery Detection
Battery Removal
www.ti.com
V_BAT = 3.8 V
V_IN = 5 V
V_REG = 4.2 V
I_CHG = 0.5 A
I_LIM = 1 A
V_BAT = 3.8 V
V_IN = 6 V
V_REG = 4.2 V
I_CHG = 1 A
I_LIM = 1 A
Figure 3.
88
86
I_CHG = 2 A
V_IN = 5 V
84 ^{VREG = 4.2 V}
Efficiency
vs
Battery Voltage
82
80
78
76
74
72
70
2.9 3.1 3.3 3.5 3.7 3.9
V_BAT (V)
Figure 5.
bq24257
4.1 4.3
C001
Efficiency
vs
Output Current
100
95
90
85
80
75
70
65
60
55
V_REG = 4.2 V
50
0 200 400 600
VI_INN==55V
VI_INN==77V
VI_INN==1100V
800 1000 1200 1400 1600 1800 2000
Output Current (mA)
C002
Figure 7.
Figure 4.
4.350
System Voltage Regulation
vs
Load Current
4.345
4.340
4.335
4.330
4.325
4.320
4.315
4.310
4.305
V_IN = 5 V
No Battery
I_LIM = 2 A
V_REG = 4.2 V
No Bat
Charge Disable
4.300
0.0
0.5
1.0
1.5
2.0
2.5
I_SYS (A)
C004
Figure 6.
Efficiency
vs
Output Current
100
95
90
85
80
75
70
65
60
55
V_REG = 3.6 V
50
0 200 400 600
VI_INN==55V
VI_INN==77V
VI_INN==1100V
800 1000 1200 1400 1600 1800 2000
Output Current (mA)
C003
Figure 8.
14
Submit Documentation Feedback
Product Folder Links: bq24257 bq24258
Copyright © 2013, Texas Instruments Incorporated