BQ24050 Datasheet, PDF (11/37 Pages) Texas Instruments – 800mA Single Cell Li-Ion Battery Charger With Automatic Adaptor/USB Detection

bq24050
bq24052
bq24055
www.ti.com.................................................................................................................................... SLUS940A – SEPTEMBER 2009 – REVISED SEPTEMBER 2009
TYPICAL OPERATIONAL CHARACTERISTICS
SETUP: bq24055 typical applications schematic; V_IN = 5V, V_BAT = 3.6V (unless otherwise indicated)
R_ISET = 1k; I_{OUT_FAST_CHG} = 540mA; R_{PAC_TERM} = 2k; I_{OUT_PRE_CHG} = 108mA; I_{OUT_TERM} = 54mA
Power UP, DOWN, OVP, Disable and Enable Waveforms
Vin
2V/div
Vin
2V/div
D+ _1V/div
Vd-
1V/div
2V/div
Vchg
2V/div
Viset
t - time - 10ms/div
Detected D- line pulled to 0.6V and the detection routine is
started.
Figure 1. D+ D- Detection for Adaptor Hot Plug
D+
1V/div
Vd-
1V/div
5V/div _Vchg
Viset
2V/div
t - time - 100ms/div
No signal detected on D+ or D-. After 500ms, the detection
routine is forced to run.
Figure 2. D+ D- Detection for Unknown Source Hot Plug
Vin
2V/div
D+
Vd-
1V/div
1V/div
5V/div _Vchg
Viset
2V/div
t - time - 100ms/div
(Device transceiver is "dead") After 500ms, the detection
routine is forced to run.
Figure 3. D+ D- Detection for USB Hot Plug no Pullup
Vin
2V/div
D+
1V/div
End of
Detection
Routine
Vd-
1V/div
Detection Routine
Started
5V/div
Viset
Vchg
2V/div
USB Communication
Between Host and
Device Receiver
t - time - 50ms/div
Figure 4. D+ D- Detection for USB Hot Plug with Pullup
Vin
Vchg
Vpg
5V/div
2V/div
2V/div
Viset
2V/div
t - time - 20ms/div
Figure 5. OVP 8V Adaptor – Hot Plug
Vin
5V/div
Vchg
2V/div
Vpg _2V/div
Viset _2V/div
t - time - 100ms/div
Figure 6. OVP from Normal Operation –
V_IN = 0V→5V→8V→5V
Copyright © 2009, Texas Instruments Incorporated
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