Datasheet

bq24270
bq24271
SLUSB10 –JUNE 2012 www.ti.com
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
DESCRIPTION (CONTINUED)
The power path management feature allows the bq24270 and bq24271 to power the system from a high
efficiency DC to DC converter while simultaneously and independently charging the battery. The charger
monitors the battery current at all times and reduces the charge current when the system load requires current
above the input current limit. This allows for proper charge termination and timer operation. The system voltage
is regulated to the battery voltage but will not drop below 3.5 V. This minimum system voltage support enables
the system to run with a defective or absent battery pack and enables instant system turn-on even with a totally
discharged battery or no 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. This
enables the use of a smaller adapter. The charge parameters are programmable using the I
2
C interface
The battery is charged in three phases: precharge, fast charge 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. Additionally, a voltage-based battery pack thermistor monitoring
input (TS) is included that monitors battery temperature for safe charging The TS function for bq24270 and
bq24271 are JEITA compatible.
ORDERING INFORMATION
PART Safety and WD V
BATSHRT
or
USB OVP CE bit Default USB Detection NTC Monitoring Package
NUMBER
(1) (2)
Timers I
BATSHRT
0 (Charge 3 V
bq24270YFFR 6.5 V D+, D- Yes JEITA WCSP
Enabled) 50 mA
0 (Charge 3 V
bq24270YFFT 6.5 V D+, D- Yes JEITA WCSP
Enabled) 50 mA
0 (Charge 3 V
bq24270RGER 6.5 V D+, D- Yes JEITA RGE
Enabled) 50 mA
0 (Charge 3 V
bq24270RGET 6.5 V D+, D- Yes JEITA RGE
Enabled) 50 mA
0 (Charge 3 V
bq24271YFFR 6.5 V PSEL Yes JEITA WCSP
Enabled) 50 mA
0 (Charge 3 V
bq24271YFFT 6.5 V PSEL Yes JEITA WCSP
Enabled) 50 mA
0 (Charge 3 V
bq24271RGER 6.5 V PSEL Yes JEITA RGE
Enabled) 50 mA
0 (Charge 3 V
bq24271RGET 6.5 V PSEL Yes JEITA RGE
Enabled) 50 mA
(1) The YFF and RGE packages are 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 Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated
Product Folder Link(s): bq24270 bq24271