BQ24152 Datasheet, PDF (9/38 Pages) Texas Instruments – Fully Integrated Switch-Mode One-Cell Li-Ion Charger with Full USB Compliance and USB-OTG Support

bq24152
www.ti.com ...................................................................................................................................................................................................... SLUS847 – JUNE 2008
TYPICAL CHARACTERISTICS (continued)
INPUT CURRENT CONTROL
Vbus = 5 V, Iin_limit = 100/500 mA,
(OTG Control, 32 Minute Mode),
2
Iin_limit = 100 mA (I C Control, 32 Second Mode)
OTG
5 V/div
I_BUS
0.2 A/div
32 Minute 32 Second
Mode
Mode
0.5 S/div
Figure 9.
BOOST WAVEFORM (PWM MODE)
VBUS 10 mV/div, 5.08 V Offset
VBAT 10 mV/div, 3.52 V Offset
CHARGER EFFICIENCY
92
Vbat = 4 V
V_BUS = 5 V
90
Vbat = 3.6 V
88
86
84
Vbat = 3 V
82
80
0 100 200 300 400 500 600 700 800 900 10001100 1200 1300
Charge Current - mA
Figure 10.
BOOST WAVEFORM (PFM MODE)
VBUS 100 mV/div, 5.06 V Offset
VBAT 100 mV/div, 3.5 V Offset
VSW
2 V/div
IL
0.2 A/div
VBAT = 3.5 V, VBUS = 5.07 V, IBUS = 215 mA
100 nS/div
Figure 11.
VBUS OVERLOAD WAVEFORMS (BOOST MODE)
VBUS
2 V/div
VBAT = 3.5 V, VBUS = 5.05 V, IBUS = 42 mA
VPMID
200 mV/div,
5.02 V Offset
VSW
5 V/div
I_BUS
0.2 A/div
5 mS/div
Figure 13.
VSW
2 V/div
IL
0.2 A/div
VBAT = 3.5 V, VBUS = 5.06 V, IBUS = 42 mA
5 mS/div
Figure 12.
LOAD STEP UP RESPONSE (BOOST MODE)
VBUS
100 mV/div,
5.06 V Offset
VBAT
0.2 V/div,
3.8 V Offset
VBAT = 3.85 V, VBUS = 5.07 V, IBUS = 0-215 mA
VSW
5 V/div
I_BAT
0.1 A/div
100 mS/div
Figure 14.
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