BQ24072T_1 Datasheet, PDF (2/34 Pages) Texas Instruments – 1.5A USB-Friendly Li-Ion Battery Charger and Power-Path Management IC

bq24072T
bq24075T, bq24079T
SLUS937A – DECEMBER 2009 – REVISED APRIL 2010
www.ti.com
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more
susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.
DESCRIPTION (CONTINUED)
The bq2407xT features dynamic power path management (DPPM) that powers the system while simultaneously
and independently charging the battery. The DPPM circuit reduces the charge current when the input current
limit causes the system output to fall to the DPPM threshold; thus, supplying the system load at all times while
monitoring the charge current separately. This feature reduces the number of charge and discharge cycles on
the battery, allows for proper charge termination and enables the system to run with a defective or absent battery
pack.
Additionally, the regulated system input enables instant system turn-on when plugged in even with a totally
discharged battery. The power-path management architecture also permits the battery to supplement the system
current requirements when the adapter cannot deliver the peak system currents, enabling the use of a smaller
adapter.
The battery is charged in three phases: conditioning, constant current, and constant voltage. In all charge
phases, an internal control loop monitors the IC junction temperature and reduces the charge current if the
internal temperature threshold is exceeded. The charger power stage and charge current sense functions are
fully integrated. The charger function has high accuracy current and voltage regulation loops, charge status
display, and charge termination. The input current limit and charge current are programmable using external
resistors.
PART NO.^{(1) (2)}
bq24072TRGTR
bq24072TRGTT
bq24075TRGTR
bq24075TRGTT
bq24079TRGTR
bq24079TRGTT
V_OVP
6.6V
6.6V
6.6 V
6.6 V
6.6 V
6.6 V
ORDERING INFORMATION
V_BAT(REG)
4.2 V
4.2 V
4.2 V
4.2 V
4.1 V
4.1 V
V_OUT(REG)
V_BAT + 225 mV
V_BAT + 225 mV
5.5 V
5.5 V
5.5 V
5.5 V
V_DPPM
V_OREG –100 mV
V_OREG –100 mV
4.3 V
4.3 V
4.3 V
4.3 V
OPTIONAL
FUNCTION
TD
TD
SYSOFF
SYSOFF
SYSOFF
SYSOFF
MARKING
PAP
PAP
OEC
OEC
OED
OED
(1) The RGT package is available in the following options:
R – taped and reeled in quantities of 3,000 devices per reel.
T – taped and reeled in quantities of 250 devices per reel.
(2) This product is RoHS compatible, including a lead concentration that does not exceed 0.1% of total product weight and is suitable for
use in specified lead-free soldering processes. In addition, this product uses package materials that do not contain halogens, including
bromine (BR) or antimony (Sb) above 0.1% of total product weight.
2
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