BQ24157 Datasheet, PDF (11/39 Pages) Texas Instruments – Fully Integrated Switch-Mode Charger With USB Compliance and USB-OTG Support

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bq24157
SLUSB80 – SEPTEMBER 2012
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
LOAD STEP UP RESPONSE (BOOST MODE)
LOAD STEP DOWN RESPONSE (BOOST MODE)
VBUS
100 mV/div,
5.05 V Offset
VBUS
200 mV/div,
5.05 V Offset
VBAT
0.2 V/div,
3.5 V Offset
VBAT
200 mV/div,
3.5 V Offset
VSW
5 V/div
I_BAT
0.1 A/div
100 mS/div
Figure 15. VBUS = 5.05 V, V_BAT = 3.5V, I_BUS = 0-217 mA
LOAD STEP DOWN RESPONSE (BOOST MODE)
VBUS
100 mV/div,
5.05 V Offset
VBAT
0.2 V/div,
3.5 V Offset
VSW
5 V/div
VSW
5 V/div
I_BAT
500 mV/div
100 mS/div
Figure 16. VBUS = 5.05, V_BAT = 3.5V, I_BUS = 360-0 mA
BOOST TO CHARGE MODE TRANSITION (OTG CONTROL)
VBUS
0.5 V/div,
4.5 V Offset
OTG
2 V/div
VSW
5 V/div
I_BAT
0.1 A/div
100 mS/div
Figure 17. VBUS = 5.05 V, V_BAT = 3.5V, I_BUS = 217 mA
BOOST EFFICIENCY
95
VBAT = 2.7 V
VBAT = 3.6 V
VBAT = 4.2 V
90
85
80
75
70
0
50
100
150
200
Load Current at VBUS - mA
Figure 19.
I_L
0.5 A/div
10 mS/div
Figure 18. VBUS = 4.5 V (Charge Mode) / 5.1 V
(Boost Mode), V_BAT = 3.5V, I_{IN_LIM} = 500 mA, (32S mode)
LINE REGULATION FOR BOOST
5.09
IBUS = 100 mA
5.08
IBUS = 200 mA
5.07
5.06
5.05
IBUS = 50 mA
5.04
5.03
5.02
5.01
2.6
2.8
3
3.2
3.4
3.6
3.8
4
4.2
VBAT - V
Figure 20.
Copyright © 2012, Texas Instruments Incorporated
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