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BQ24079T Datasheet(PDF) 2 Page - Texas Instruments |
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BQ24079T Datasheet(HTML) 2 Page - Texas Instruments |
2 / 34 page 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. ORDERING INFORMATION OPTIONAL PART NO.(1) (2) VOVP VBAT(REG) VOUT(REG) VDPPM MARKING FUNCTION bq24072TRGTR 6.6V 4.2 V VBAT + 225 mV VOREG –100 mV TD PAP bq24072TRGTT 6.6V 4.2 V VBAT + 225 mV VOREG –100 mV 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 Submit Documentation Feedback Copyright © 2009–2010, Texas Instruments Incorporated Product Folder Link(s): bq24072T bq24075T bq24079T |
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