BQ24070 DATASHEET PDF
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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The efficiency for charging the battery is the same for both cases. If VOUT drops to the battery voltage, the battery is able to supplement the input current to the system.
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This theory is easily verified by performing a charge cycle on a discharged battery while monitoring the battery voltage and chargers power pad temperature. See the section titled Power-Path Management for additional details.
datashheet Testing and other quality control techniques are used to the extent TI deems necessary to support this warranty. Table 1 summarizes the MODE pin function. The voltage on the ISET1 pin is directly proportional to the programmed charging current. To recover from this ba24070, there is a mA current source from the battery to the output. I DPPM is the internal current source. The package includes a QFN thermal pad to provide an effective thermal contact between the device and the printed-circuit board.
The dropout voltage increases proportionally to the increase in current. The corresponding output turns ON low when exiting sleep mode input voltage above battery voltage.
SF is the scale factor as specified in the specification table. This could happen as a result of a load on the battery, self-discharge, or battery removal.
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See a typical charge datasjeet, application circuit, and an operational flow chart in Figure 1 through Figure 3, respectively. The exposed thermal pad must be connected to the same potential as the VSS pin on the printed-circuit board. Submit Documentation Feedback 17 bq www. Power-Path Management Case 1: The charge current is reduced until there is no further drop on the output voltage.
The battery charge current is then adjusted back as necessary to keep the output voltage from falling any further. The package includes a QFN thermal pad to provide an effective thermal contact between the device dataseet the printed-circuit board PCB. Resale of TI products or services with statements different from or beyond the parameters stated by TI for bq240770 product or service voids all express and any implied warranties for the associated TI product or service and is an unfair and deceptive business practice.
All voltage values are with respect to the network ground terminal unless otherwise noted.
The recommended capacitance is 1 nF to 10 nF. Charge Profile Submit Documentation Feedback 9 bq www. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under recommended operating conditions is not implied.
The bq powers the system while independently charging the battery. Battery Charge Current The bq offers on-chip current regulation with programmable set point. This ensures proper hot plug power up with a no-load condition no system load or battery attached. This features reduces the charge and discharge cycles on the battery, allows for proper charge termination, and allows the system to run with an absent or defective battery pack. Otherwise, the output drops to the battey voltage; therefore, the system should have a low-power mode for USB power application.
This is the battery supplement mode. A high-level signal on this pin enables the chip, and a low-level signal disables the device and initiates the standby mode. These status pins can be used to drive LEDs or communicate to the host processor. Therefore, it is customary to perform the steady-state thermal design using 3. The bq offers DC supply AC adapter power-path management with autonomous power-source selection, power FETs and current sensors, high-accuracy current and voltage regulation, charge status, and charge termination, in a single monolithic device.
It can be calculated from Equation R – taped and reeled in quantities of 3, devices per reel. No active control limits the current to the system; therefore, if the system demands more current than the input can provide, the output voltage drops just below the battery voltage and Q2 turns on which supplements the input current to the system.
The bq enters the low-power standby mode when the CE input is low with input present. Because the charge current typically is programmed for more current than the USB current limit datsheet, the output voltage drops to the battery voltage or DPPM voltage, whichever is higher.