BQ24157S Datasheet, PDF (33/45 Pages) Texas Instruments – Full USB Compliance and USB-OTG Support

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9.2.3 Application Curves
Not Recommended for New Designs
bq24157S
SLUSB76B – FEBRUARY 2013 – REVISED MAY 2015
V_(VBUS)
2 V/div
V_(BAT)
2 V/div
V_(SW)
2 V/div
V(VBUS)
V(BAT)
V(SW)
V_(VBUS)
2 V/div
V_(BAT)
2 V/div
V_(SW)
2 V/div
V(VBUS)
V(BAT)
V(SW)
I_(BAT)
500 mA/div
I(BAT)
I_(BAT)
500 mA/div
I(BAT)
VBUS = 0 to 5 V
VBAT = 3.5 V
100 ms/div
I_{IN_limit} = 500 mA
I_CHG = 550 mA
V_BATREG = 4.2 V
Figure 30. Adapter Insertion (HOST Mode)
V_(VBUS)
2 V/div
V_(BAT)
2 V/div
V_(SW)
2 V/div
V(VBUS)
V(BAT)
V(SW)
I_(BAT)
500 mA/div
I(BAT)
VBUS = 5 V
V_BATREG = 4.2 V
Termination Enabled
1 s/div
V_BAT = 3.5 V
I_CHG = 550 mA
I_{IN_limit} = 500 mA
Figure 31. Battery Insertion/Removal Termination Enabled
(HOST Mode)
VSW
VSW
2 V/div
IND
I Inductor
500 ms/div
VBUS = 5 V
V_BATREG = 4.2 V
1 s/div
V_BAT = 3.5 V
I_CHG = 550 mA
I_{IN_limit} = 500 mA
Termination
Enabled
Figure 32. Battery Insertion/Removal Termination Disabled
(HOST Mode)
AC Coupled
VBUS
100 mV/div
AC Coupled
VBAT
100 mV/div
VBUS
VBAT
VSW
2 V/div
VSW
I Inductor
IND
200 mA/div
VBUS = 5 V
I_CHG = 950 mA
200 ns/div
V_BAT = 2.6 V
V_OREG = 4.2 V
Figure 33. PWM Charging Waveforms
VBAT
2 V/div
VBAT
I_BAT
1 A/div
IBAT
VBUS = 5.05 V
100 ns/div
V_BAT = 3.5 V
I_BUS = 217 mA
Figure 34. Boost Waveform (PWM Mode)
5.5-V input voltage
200 μs/div
Figure 35. Step Load from 0 to 2 A During Factory Mode
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