products and disclaimers thereto appears at the end of this data sheet. With the MODE pin low, the bq/1 defaults to USB charging at the charge rate. BQ datasheet, BQ circuit, BQ data sheet: TI – SINGLE-CHIP LI -ION CHARGE AND SYSTEM POWER-PATH MANAGEMENT IC,alldatasheet. Click on a date/time to view the file as it appeared at that time. Date/Time, Dimensions, User, Comment. current, , 7 December , ( MB), Knight (talk.
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This ensures proper hot plug power up with a no-load condition no system load or battery attached. The Q2 FET continues to connect the battery to the output systemif input power is not sufficient; however, a short-circuit vq24070 circuit limits the battery discharge current such that the maximum power dissipation of the part is not exceeded under typical design conditions.
The voltage on the ISET1 pin is directly proportional to the programmed charging current. Table 1 indicates when this feature is enabled. This feature works as follows.
Note that charge current is dynamically adjusted during b24070 thermal regulation or DPPM mode. Temperature Regulation and Thermal Protection In order to maximize charge rate, the bq features a junction temperature regulation loop. If the battery dztasheet goes above the recharge threshold, then the bq disables the I FAULT current and executes the recovery method described for condition 1.
This feature gives the system priority on input power, allowing the system to power up with a deeply discharged battery pack. The bq powers the system while independently charging the battery.
(PDF) bq24070 Datasheet download
Testing and other quality control techniques are used to the extent TI deems necessary to support this warranty. At the 4th dqtasheet, the output has reached steady-state operation at the DPPM voltage level charge current has been reduced due to the limited USB input current.
It is difficult to estimate a total safety time without integrating the above equation over the charge cycle. Therefore, understanding the theory that the safety time is adjusted inversely proportionately with the datasueet current and the battery is a current-hour rating, the safety time dynamically adjusts appropriately.
This can be accomplished by floating the DPPM pin. For example, if the peak system load is 1.
This input is tied directly to the positive side of the battery pack. Use of such information may require a license from a third party under the patents or other intellectual darasheet of the third party, or a license from TI under the patents or other intellectual property of TI. See Figure 7 for power up by battery insertion.
If a load is present that keeps the output more than mV below the battery, a short-circuit condition is declared. The device power dissipation, P, is a function of the charge rate and the voltage drop across the internal power. This feature allows the designer to select a lower power wall adapter, if the average system load is moderate compared to its peak power.
To minimize the risks associated with customer products and applications, customers should provide adequate design and operating safeguards. This theory is easily verified by performing a charge cycle on a discharged battery while monitoring the battery voltage datasheer chargers power pad temperature.
Note that this action eliminates all safety timers, and also clears any timer fault. Submit Documentation Feedback 13 bq www. Therefore, it is customary to perform the steady-state thermal design using 3. This theory is easily verified by datasueet a charge cycle on a discharged battery while monitoring the battery voltage and chargers power pad temperature.
The package includes a QFN thermal pad to provide an effective thermal contact between the device and the printed-circuit board PCB. See theTimer Fault Recovery section for additional details.
The package includes a QFN thermal pad to provide an effective thermal contact between the device and the printed-circuit board PCB. TS Pin Configuration Figure In addition, this product uses package materials that do not contain halogens, including bromine Bq4070 or antimony Sb above 0.
As a safety backup, the bq also monitors the charge time in the charge mode. T – taped and reeled in quantities of devices per reel.
TI assumes no liability for applications assistance or customer product design. The battery supplement mode has no thermal protection. TI does not warrant or represent that any license, either express or implied, is granted under any TI patent right, copyright, mask work right, or other TI intellectual property right relating to any combination, machine, or process in which TI products or services are used.
However, the user may increase the range by adding two external resistors. R – taped and reeled in quantities of 3, devices per reel. The rate of discharge on the output is a function of system capacitance and load.
BQ from Texas Instruments
SF is the scale factor as specified in the specification table. VSS pin must be connected to ground at all times. Power-Path Management The bq powers the system while independently charging the battery. This small current is used to detect a battery removal condition and remains on as long as the battery voltage stays below the recharge threshold.