BQ24157 Datasheet, PDF (9/39 Pages) Texas Instruments – Fully Integrated Switch-Mode Charger With USB Compliance and USB-OTG Support

www.ti.com
TYPICAL PERFORMANCE CHARACTERISTICS
bq24157
SLUSB80 – SEPTEMBER 2012
Using circuit shown in Figure 2, T_A = 25°C, unless otherwise specified.
vertical spacer
ADAPTER INSERTION
CYCLE BY CYCLE CURRENT LIMITING IN CHARGE MODE
VBUS
2 V/div
VSW
2 V/div
VSW
5 V/div
I_BAT
0.5 A/div
10 ms/div
Figure 3. VBUS = 0-5V, Iin_limit = 500mA, Voreg = 4.2V
VBAT = 3.5V, I_CHG = 550mA, 32S mode
PWM CHARGING WAVEFORMS
VSW
2 V/div
I_L
0.5 A/div
100 nS/div
Figure 5. VBUS = 5 V, V_BAT = 2.6 V, Voreg = 4.2 V,
I_CHG = 1550 mA
VSW
5 V/div
CHARGE CURRENT RAMP UP
I_L
0.5 A/div
VBUS
2 V/div
2 ms/div
Figure 4. VBUS = 5V, V_BAT = 3.5V
Charge Mode Overload Operation
POOR SOURCE DETECTION
VSW
2 V/div
I_BUS
20 mA/div
10 mS/div
Figure 6. VBUS = 5 V at 8 mA, V_BAT = 3.2V,
Iin_limit = 100 mA, I_CHG = 550 mA
INPUT CURRENT CONTROL
OTG
2 V/div
15 Minute Mode
32 S Mode
I_BAT
200 mA/div
500 mS/div
Figure
7.
Vin
=
5
V,
VI_BCAHTG==
3. 2V, No
1550mA
Input
Current
Limit,
I_BAT
0.1 A/div
Write Command
1 S/div
Figure 8. VBUS = 5 V, V_BAT = 3.1V, Iin_limit = 100/500 mA,
(OTG Control, 15 Minute Mode), Iin_limit = 100 mA
(I²C Control, 32 Second Mode)
Copyright © 2012, Texas Instruments Incorporated
Product Folder Links :bq24157
Submit Documentation Feedback
9