BQ24040 Datasheet, PDF (12/31 Pages) Texas Instruments – 800mA Single-Input Single Cell Li-Ion Battery Charger With Auto Start

bq24040
bq24041
SLUS941A – SEPTEMBER 2009 – REVISED SEPTEMBER 2009.................................................................................................................................... www.ti.com
TYPICAL OPERATIONAL CHARACTERISTICS (continued)
SETUP: bq24040 typical applications schematic; V_IN = 5V, V_BAT = 3.6V (unless otherwise indicated)
PROTECTION CIRCUITS WAVEFORMS
Vout
1V/div
Vchg
5V/div
Viset
1V/div
V_0.1 W_OUT
100mV/div
Battery
Threshold
Reached
t - time - 500ms/div
CH4: Iout (1A/Div)Battery voltage swept from 0V to 4.25V to
3.9V.
Figure 12. Battery Charge Profile
Vout _1V/div
500mV/div
Viset
Vchg 2V/div
V_0.1 W_OUT
I_OUT Clamped Current
100mV/div
I_SET Short Detected
and Latched Off
t - time - 200ms/div
CH4: Iout (1A/Div)
Figure 13. ISET Shorted During Normal Operation
Vchg
Vin
2V/div
2V/div
Viset
500mV/div
20mV/div
Short Detected in 100mA
mode and Latched Off
V_0.1 W_OUT
t - time - 5ms/div
CH4: Iout (0.2A/Div)
Figure 14. ISET Shorted Prior to USB Power-up
Vin
Vchg
2V/div
2V/div
500mV/div
20mV/div
Viset
V_0.1W_OUT
t - time - 1ms/div
CH4: Iout (0.2A/Div)
Figure 15. DPM – Adaptor Current Limits – Vin Regulated
Vin 2V/div
Vchg _2V/div
500mV/div
20mV/div
Viset
V_0.1W_OUT
t - time - 500ms/div
Figure 16. DPM – USB Current Limits – Vin Regulated to 4.4V
Vout
1V/div
Enters
Thermal
Regulation
Vin _2V/div
Exits
Thermal
Regulation
Viset
V_0.1W_OUT
50mV/div
1V/div
t - time - 1s/div
The IC temperature rises to 125°C and enters thermal
regulation. Charge current is reduced to regulate the IC at
125°C. VIN is reduced, the IC temperature drops, the charge
current returns to the programmed value.
Figure 17. Thermal Reg. – Vin increases PWR/Iout Reduced
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