BQ24157 Datasheet, PDF (10/39 Pages) Texas Instruments – Fully Integrated Switch-Mode Charger With USB Compliance and USB-OTG Support

bq24157
SLUSB80 – SEPTEMBER 2012
www.ti.com
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN BASED DPM
CHARGER EFFICIENCY
94
VBUS
1 V/div
93
92
Vbat = 4.2 V
91
Vbat = 3.6 V
90
89
88
87
86
IBUS
0.2 A/div
85
Vbat = 3 V
84
83
82
81
0.5 mS/div
80
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 1.1 1.2 1.3 1.4 1.5
Charge Current - A
Figure 9. VBUS = 5 V at 500 mA, V_BAT = 3.5V,
I_CHG = 1550 mA,
V_{IN_DPM} = 4.52 V
Figure 10.
VBUS
10 mV/div,
5.05 V Offset
VBAT
10 mV/div,
3.5 V Offset
VSW
2V/div
BOOST WAVEFORM (PWM MODE)
VBUS
100 mV/div,
5.05 V Offset
VBAT
100 mV/div,
3.5 V Offset
BOOST WAVEFORM (PFM MODE)
VSW
2 V/div
IL
100 mA/div
100 nS/div
Figure 11. VBUS = 5.05 V, V_BAT = 3.5V, I_BUS = 217 mA
VBUS OVERLOAD WAVEFORMS (BOOST MODE)
VBUS
2 V/div
VPMID
200 mV/div,
5.02 V Offset
VSW
5 V/div
I_BUS
0.2 A/div
5 mS/div
Figure 13. VBUS = 5.051KV,_ΩVt_BoAT0.=5Ω3.5V, R_LOAD (at VBUS) =
I_L
0.2 A/div
5 mS/div
Figure 12. VBUS = 5.05 V, V_BAT = 3.5V, I_BUS = 42 mA
LOAD STEP UP RESPONSE (BOOST MODE)
VBUS
200 mV/div,
5.05 V Offset
VBAT
200 mV/div,
3.5 V Offset
VSW
5 V/div
I_BAT
500 mV/div
100 mS/div
Figure 14. VBUS = 5.05, V_BAT = 3.5V, I_BUS = 0-360 mA
10
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