BQ24161B_15 Datasheet, PDF (14/52 Pages) Texas Instruments – bq2416xx 2.5A, Dual-Input, Single-Cell Switched-Mode Li-Ion Battery Charger with Power Path Management and I2C Interface

bq24160, bq24160A, bq24161
bq24161B, bq24163, bq24168
SLUSAO0F – NOVEMBER 2011 – REVISED JULY 2014
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9.3 Feature Description
9.3.1 Charge Mode Operation
9.3.1.1 Charge Profile
The internal battery MOSFET is used to charge the battery. When the battery is above the MINSYS voltage, the
internal FET is on to maximize efficiency and the PWM converter regulates the charge current into the battery.
When battery is less than MINSYS, the SYS is regulated to V_SYS(REG) and battery is charged using the battery
FET to regulate the charge current. There are 5 loops that influence the charge current:
• Constant current loop (CC)
• Constant voltage loop (CV)
• Thermal-regulation loop
• Minimum system-voltage loop (MINSYS)
• Input-voltage dynamic power-management loop (V_IN-DPM)
During the charging process, all five loops are enabled and the one that is dominant takes control. The bq2416xx
supports a precision Li-Ion or Li-Polymer charging system for single-cell applications. The Dynamic Power Path
Management (DPPM) feature regulates the system voltage to a minimum of V_MINSYS, so that startup is enabled
even for a missing or deeply discharged battery. Figure 10 shows a typical charge profile including the minimum
system output voltage feature.
Regulation
voltage
Precharge
Phase
Current Regulation
Phase
VSYS
System Voltage
Voltage Regulation
Phase
Charge Current
Regulation
Threshold
V_BATSHORT
Battery
Voltage
Charge Current
Termination
Current
Threshold
I_BATSHORT
50mA Precharge to
Close Pack Protector
Linear Charge
to Maintain
Minimum
System
Voltage
Battery FET is ON
Battery
FET
is OFF
Figure 10. Typical bq2416xx Charging Profile
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