BQ24157S Datasheet, PDF (9/45 Pages) Texas Instruments – Full USB Compliance and USB-OTG Support

Not Recommended for New Designs
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bq24157S
SLUSB76B – FEBRUARY 2013 – REVISED MAY 2015
Typical Performance Characteristics (continued)
Using circuit shown in Figure 28, T_A = 25°C, unless otherwise specified.
94
AC Coupled
93
VBUS
92
100 mV/div
91
AC Coupled
90
VBAT
89
100 mV/div
88
87
AC Coupled
86
VSW 2 V/div
85
84
83
VBAT = 3.0 V
82
VBAT = 3.6 V
81
VBAT = 4.2 V
80
I Inductor
0.2 A/div
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5
Charge Current (A)
VBUS = 5.05 V
VBUS
VSW
VBAT
IND
5 μs/div
V_BAT = 3.5 V
I_BUS = 42 mA
VBUS
5 V/div
VPMID
2 V/div
VSW
5 V/div
I_BUS
0.5 A/div
Figure 7. Charger Efficiency
VBUS
VPMID
IBUS
VSW
5 ms/div
VBUS = 5.05 V
V_BAT = 3.5 V
I_LOAD (at VBUS) = 5 to 450 mA
Figure 8. Boost Waveform (PFM Mode)
VBUS
200 mV/div,
5.05 V Offset
VBAT
200 mV/div,
3.5 V Offset
VSW
5 V/div
I_BAT
500 mV/div
VBUS = 5.05 V
100 μs/div
V_BAT = 3.5 V
I_BUS = 0 to 360 mA
Figure 9. VBUS Overload Waveforms (Boost Mode)
VBUS
100 mV/div
5.05 V Offset
Figure 10. Load Step Up Response (Boost Mode)
VBUS
2 V/div
VBUS
VBAT
0.2 V/div
3.5 V Offset
VSW
5 V/div
OTG
5 V/div
VSW
5 V/div
OTG
VSW
I_BAT
0.1 A/div
VBUS = 5.05 V
100 μs/div
V_BAT = 3.5 V
I_BUS = 0 to 217 mA
Figure 11. Load Step Up Response (Boost Mode)
I_BUS
0.5 A/div
IBUS
10 ms/div
VBUS = 4.5 V (Charge Mode) VBUS = 5.1 V (Boost Mode)
V_BAT = 3.5 V, I_{IN_LIM} = 500 mA, (HOST Mode)
Figure 12. Boost to Charge Mode Transition (OTG Control)
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