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| BQ25060_1 Datasheet, PDF (12/24 Pages) Texas Instruments – 1A, Single-Input, Single Cell Li-Ion Battery Charger with 50-mA LDO, and External Power Path Control | |||
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bq25060
SLUSA32 â MAY 2010
Charger Operation with External Power Path Control Mode Enabled
PRECHARGE
4.2V
IIN(LIM)
CC FAST CHARGE
Maximum
Charge Current
System Voltage
CV TAPER
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3.5V
VLOWV
IPRECHG
ITERM
Battery Voltage
CHG = Hi -Z
Figure 18. Typical Charging Cycle with External Power Path Control Enabled
Precharge Mode (VBAT ⤠VLOWV)
The bq25060 enters precharge mode when VBAT ⤠VLOWV. Upon entering precharge mode, the battery is charged
with a 40mA current source and /CHG goes low. During precharge mode, VOUT is regulated to 3.5V and the
battery is charged from the internal fixed 40mA current source connected to the BAT output. With BGATE
connected to GND, the system output is connected to the battery and therefore the system voltage is equal to
the battery voltage.
Minimum Output Regulation Mode (2.9V<VBAT<3.6V)
Once VBAT exceeds 2.9V, the bq25060 enters Minimum Output Regulation Mode. While 2.9V<VBAT<3.6V, VOUT
is regulated to VOUT(REG) by the external FET (QBAT) while the internal FETs between IN and OUT is used to
regulate the fast charge current. The total current is shared between the output load and the battery. As the
system current increases, the battery charge current decreases. In order to maintain the minimum output
regulation voltage VOUT(REG), the system load must be less than the input current limit.
Normal CC/CV Mode
Once VBAT>3.6V, QBAT is fully turned on and VOUT = VBAT + Vdrop(Q1). At this point, the bq25060 is in constant
current (CC) mode where charge current is regulated using the internal FETs between IN and OUT. The VOUT
voltage is not regulated. The total current is shared between the output load and the battery. Once the battery
voltage charges up to VBAT(REG), the bq25060 enters constant voltage (CV) mode where VBAT is regulated to
VBAT(REG) and the current is reduced. Once the input current falls below the termination threshold (ITERM)
BGATE is turned off and CHG goes high impedance. The system output is regulated to 4.2V and the battery is
disconnected from OUT, however supplement mode is still available.
12
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Copyright © 2010, Texas Instruments Incorporated
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