BQ24705 Datasheet, PDF (9/30 Pages) Texas Instruments – Host-Controlled Multi-Chemistry Battery Charger With Low Input Power Detect

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bq24705
SLUS779 – DECEMBER 2007
TYPICAL CHARACTERISTICS
Table of Graphs⁽¹⁾
Y
X
VREF Load and Line Regulation
vs Load Current
REGN Load and Line Regulation
vs Load Current
BAT Voltage
vs VADJ/VREF Ratio
Charge Current
vs SRSET/VREF Ratio
Input Current
vs ACSET/VREF Ratio
BAT Voltage Regulation Accuracy
vs Charge Current
BAT Voltage Regulation Accuracy
Charge Current Regulation Accuracy
Input Current Regulation (DPM) Accuracy
V_IADAPT Input Current Sense Amplifier Accuracy
Input Regulation Current (DPM), and Charge Current vs System Current
Transient System Load (DPM) Response
Charge Current Regulation
vs BAT Voltage
Efficiency
vs Battery Charge Current
Battery Removal (from Constant Current Mode)
REF and REGN Startup
Charger on Adapter Removal
Charge Enable / Disable and Current Soft-Start
Nonsynchronous to Synchronous Transition
Synchronous to Nonsynchronous Transition
Near 100% Duty Cycle Bootstrap Recharge Pulse
Battery Shorted Charger Response, Over Current Protection (OCP) and Charge Current Regulation
Continuous Conduction Mode (CCM) Switching Waveforms
Discontinuous Conduction Mode (DCM) Switching Waveforms
DPMDET Response with Transient System Load
Figure
Figure 4
Figure 5
Figure 6
Figure 7
Figure 8
Figure 9
Figure 10
Figure 11
Figure 12
Figure 13
Figure 14
Figure 15
Figure 16
Figure 17
Figure 18
Figure 19
Figure 20
Figure 21
Figure 22
Figure 23
Figure 24
Figure 25
Figure 26
Figure 27
Figure 28
(1) Test results based on Figure 3 application schematic. V_IN = 20 V, V_BAT = 3-cell Li-Ion, I_CHG = 3 A, I_{ADAPTER_LIMIT} = 4 A, T_A = 25°C,
unless otherwise specified.
0.50
0.40
0.30
0.20
0.10
0
-0.10
-0.20
0
VREF LOAD AND LINE REGULATION
vs
Load Current
PVCC = 10 V
PVCC = 20 V
10
20
30
40
50
VREF - Load Current - mA
Figure 4.
REGN LOAD AND LINE REGULATION
vs
LOAD CURRENT
0
-0.50
-1
-1.50
-2
PVCC = 10 V
-2.50
PVCC = 20 V
-3
0
10 20 30 40 50
60 70
80
REGN - Load Current - mA
Figure 5.
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