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| BQ2406X Datasheet, PDF (7/31 Pages) Texas Instruments – 1A SINGLE-CHIP Li-Ion/Li-Pol CHARGE MANAGEMENT IC WITH THERMAL REGULATION | |||
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bq2406x
www.ti.com
SLUS689 â JUNE 2006
When the charger is enabled two control loops modulate the battery switch drain to source impedance to limit
the BAT pin current to the programmed charge current value (charge current loop) or to regulate the BAT pin
voltage to the programmed charge voltage value (charge voltage loop). If V(BAT) < V(LOWV) (3.0 V typical) the
BAT pin current is internally set to 10% of the programmed charge current value.
A typical charge profile is shown below, for an operation condition that does not cause the IC junction
temperature to exceed TJ(REG), (112°C typical).
VO(BATREG)
Pre-
Conditioning
Phase
IO(BAT)
Current
Regulation
Phase
Voltage Regulation and
Charge Termination
Phase
DONE
FAST-CHARGE
CURRENT
Battery Current,
I(BAT)
v(LOWV)
Battery Voltage,
V(BAT)
Charge
Complete
Status,
Charger
Off
IO(PRECHG), I(TERM)
PRE-CHARGE
CURRENT AND
TERMINATION
THRESHOLD
T(PRECHG)
T(CHG)
Figure 1. Charging Profile With TJ(REG)
DONE
If the operating conditions cause the IC junction temperature to exceed TJ(REG), the charge cycle is modified,
with the activation of the integrated thermal control loop. The thermal control loop is activated when an internal
voltage reference, which is inversely proportional to the IC junction temperature, is lower than a fixed,
temperature stable internal voltage. The thermal loop overrides the other charger control loops and reduces the
charge current until the IC junction temperature returns to TJ(REG), effectively regulating the IC junction
temperature.
IN
VREF
VTJ
Thermal
Loop
BATTERY
SWITCH I(BAT)
BAT
I(BAT) / K(SET)
V(OUT)
VO(REG)
System Voltage
Regulation Loop
ISET
Figure 2. Thermal Regulation Circuit
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