BQ24157S Datasheet, PDF (8/45 Pages) Texas Instruments – Full USB Compliance and USB-OTG Support

Not Recommended for New Designs
bq24157S
SLUSB76B – FEBRUARY 2013 – REVISED MAY 2015
7.6 Typical Performance Characteristics
Using circuit shown in Figure 28, T_A = 25°C, unless otherwise specified.
VSW
5 V/div
VSW
VSW
5 V/div
VSW
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I Inductor
500 mA/div
IND
I_BAT
200 mA/div
IBAT
VBUS = 5 V
2 μs/div
V_BAT = 3.5 V
Figure 1. Cycle by Cycle Current Limiting In Charge Mode
Overload Operation
VBUS
4 V/div
VBAT
2 V/div
VSW
5 V/div
IBUS
100 mA/div
VBUS = 5 V
100 ms/div
No Battery Connected
Termination Disabled
Figure 3. Power Up in DEFAULT Mode
V_IN = 5 V
200 μs/div
V_BAT = 3.2 V
I_CHG = 950 mA
Figure 2. Charge Current Ramp Up
No Input Current Limit
VBUS
2 V/div
VSW
2 V/div
I_BUS
20 mA/div
VBUS = 5 V at 8 mA
I_CHG = 550 mA
10 ms/div
V_BAT = 3.2 V
I_{IN_limit} = 100 mA
Figure 4. Poor Source Detection
OTG
2 V/div
OTG
DEFAULT Mode
HOST Mode
VBUS
1 V/div
VBUS
IBUS
I_BAT
200 mA/div
IBAT
Write Command
1 s/div
OTG Control, DEFAULT Mode: VBUS = 5 V, V_BAT = 3.1 V,
I_{IN_limit} = 100 and 500 mA
I²C Control, HOST Mode: I_{IN_limit} = 100 mA
Figure 5. Input Current Control
I_BUS
200 mA/div
VBUS = 5 V at 500 mA
V_{IN_DPM} = 4.52 V
500 μs/div
V_BAT = 3.5 V
I_CHG = 1550 mA
Figure 6. VIN Based DPM
8
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