BQ24152 Datasheet, PDF (10/38 Pages) Texas Instruments – Fully Integrated Switch-Mode One-Cell Li-Ion Charger with Full USB Compliance and USB-OTG Support

bq24152
SLUS847 – JUNE 2008 ...................................................................................................................................................................................................... www.ti.com
TYPICAL CHARACTERISTICS (continued)
LOAD STEP DOWN RESPONSE (BOOST MODE)
VBUS
100 mV/div,
5.06 V Offset
V_BAT
0.2 A/div,
3.8 V Offset
VBAT = 3.85 V, VBUS = 5.07 V, IBUS = 215 mA-0
CYCLE BY CYCLE CURRENT LIMITING IN BOOST MODE
Vbat = 3.6 V, Vbus = 4.11 V, Boost mode
overload operation
VSW
2 V/div
VSW
5 V/div
I_BAT
0.1 A/div
IL
0.5 A/div
100 mS/div
Figure 15.
BOOST TO CHARGE MODE TRANSITION (OTG CONTROL)
VBUS
0.5 V/div,
4.5 V Offset
OTG
2 V/div
VSW
5 V/div
Vbus = 4.5 V, (Charge Mode)/5.1 V (Boost Mode),
Iin_limit = 500 mA, Vbat = 3.4 V, 32S Mode.
IL
0.5 A/div
0.5 mS/div
Figure 17.
5.1
5.09
5.08
5.07
5.06
5.05
5.04
5.03
5.02
5.01
5
4.99
2.5
LINE REGULATION FOR BOOST
IBUS = 100 mA
IBUS = 200 mA
IBUS = 50 mA
2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1
VBAT - V
Figure 19.
200 nS/div
Figure 16.
BOOST EFFICIENCY
95
VBAT = 4 V
90
VBAT = 3.6 V
85
VBAT = 2.5 V
80
75
70
0
5.1
5.09
5.08
5.07
5.06
5.05
5.04
5.03
5.02
5.01
5
0
50
100
150
200
Load Current at VBUS - mA
Figure 18.
LOAD REGULATION FOR BOOST
VBAT = 3.6 V
VBAT = 4 V
VBAT = 2.5 V
50
100
150
200
Load Current at VBUS - mA
Figure 20.
10
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