BQ25890_16 Datasheet, PDF (17/69 Pages) Texas Instruments – Adjustable Voltage USB On-the-Go Boost Mode

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8.7 Typical Characteristics
95%
94%
93%
92%
91%
90%
89%
88%
87%
86%
85%
0
1
VBAT = 3.8 V
VBUS = 5 V
VBUS = 9 V
VBUS = 12 V
2
3
4
5
Charge Current (A)
D001
DCR = 10 mΩ
Figure 1. Charge Efficiency vs Charge Current
96%
94%
92%
90%
88%
86%
84%
82%
VBUS = 3.2 V
VBUS = 3.8 V
80%
0
0.5
1
1.5
2
2.5
VBUS (A)
D003
Figure 3. Boost Mode Efficiency vs VBUS Load Current
3.7
3.68
3.66
3.64
3.62
3.6
3.58
3.56
3.54
3.52
3.5
0
0.5
VBAT = 2.9 V
1
1.5
2
System Load Current (A)
VBUS = 5 V
VBUS = 5 V
2.5
3
D006
SYSMIN = 3.5 V
Figure 5. SYS Voltage Regulation vs System Load Current
bq25890, bq25892
SLUSC86B – MARCH 2015 – REVISED MAY 2016
95%
93%
91%
89%
87%
85%
83%
81%
79%
77%
75%
0
VBUS = 5 V
VBUS = 9 V
VBUS = 12 V
0.5
1
1.5
2
System Load Current (A)
D002
Figure 2. System Light Load Efficiency vs System Light
Load Current
6%
5%
4%
3%
2%
1%
0
-1%
-2%
-3%
-4%
-5%
-6%
0.5 1 1.5
VBUS = 9 V
2 2.5 3 3.5
Charge Current (A)
VBAT = 3.1 V
VBAT = 3.8 V
4 4.5 5
D005
Figure 4. Charge Current Accuracy vs Charge Current
Accuracy
4.5
4.45
4.4
4.35
4.3
4.25
4.2
4.15
4.1
4.05
4
0
0.5
VBAT = 4.2 V
1
1.5
2
System Load Current (A)
VBUS = 5 V
2.5
3
D007
Figure 6. SYS Voltage Regulation vs System Load Current
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