bq24072T

bq24075T, bq24079T

SLUS937A – DECEMBER 2009 – REVISED APRIL 2010

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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.

ORDERING INFORMATION

OPTIONAL

MARKING

FUNCTION

bq24072TRGTR

6.6V

4.2 V

TD

PAP

bq24072TRGTT

6.6V

4.2 V

TD

PAP

bq24075TRGTR

6.6 V

4.2 V

5.5 V

4.3 V

SYSOFF

OEC

bq24075TRGTT

6.6 V

4.2 V

5.5 V

4.3 V

SYSOFF

OEC

bq24079TRGTR

6.6 V

4.1 V

5.5 V

4.3 V

SYSOFF

OED

bq24079TRGTT

6.6 V

4.1 V

5.5 V

4.3 V

SYSOFF

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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Product Folder Link(s): bq24072T bq24075T bq24079T