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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If the battery voltage goes above the recharge threshold, then the bq disables the I FAULT current and executes the recovery method described for condition 1.
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Note that OFF indicates the open-drain transistor is turned off. TS Pin Configuration Figure In most applications, all that is needed is a high-frequency decoupling capacitor on the input. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.
Submit Documentation Feedback 21 bq www. Use of such information may require a license from a third party under the patents or other intellectual property of the third party, or a license from TI under the patents or other intellectual property of TI.
Testing and other quality control techniques are used to the extent TI deems necessary to support this warranty. T – taped and reeled in quantities of devices per reel. The battery short-circuit protection can be disabled recommended only for a short time if the voltage on the DPPM pin is less than 1 V. Information published by TI regarding third-party products or services does not constitute a license from TI to use such products or services or a warranty or endorsement thereof.
The system’s power management is responsible for keeping its system load below the USB current level selected if the battery is critically low or missing. Note that charge current is dynamically adjusted during the thermal regulation or DPPM mode. This is the battery supplement mode. Input power FETs turn off during thermal shutdown. Resale of TI products or services with statements different from or beyond the parameters stated by TI for that 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.
These status pins can be used to drive LEDs or communicate to the host processor. The IC design is focused on supplying continuous power to the system when available from the AC adapter or battery sources.
If the output load exceeds the available USB current, the output instantly goes into the battery supplement mode.
Specification is for monitoring charge current via the ISET1 pin during voltage regulation mode, not for a reduced fast-charge level. Charge is resumed when the temperature returns to the normal range. 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.
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. Too large a capacitance on this pin too much of a delay could allow too-high currents if the output was shorted to ground.
This theory is easily. Use a single-point ground technique incorporating both the small signal ground path and the power ground path.
This feature also allows for the system to instantaneously turn on from an external power source in the case of a deeply discharged battery pack.
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A high-level signal on this pin enables the chip, and a low-level signal disables the device and initiates the standby mode. At the 4th division, the output has reached steady-state operation at the DPPM voltage level charge current has been reduced due to the limited USB input current. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
The safety timer is dynamically adjusted bw24070 in Datashdet mode. See a typical charge profile, application circuit, and an operational flow chart in Figure 1 through Figure 3, respectively.
BQ from Texas Instruments
Submit Documentation Feedback 19 bq www. This feature bs24070 designed to limit the power drawn from the input supply such as USB suspend mode. Due to the charge profile of Li-xx batteries, the maximum power dissipation is typically seen at the beginning of.
If the system load exceeds the capacity of the supply, the output voltage drops down to the battery’s voltage.
To avoid false termination, the termination detect function is disabled while in this mode. The package includes a QFN thermal pad to provide an effective thermal contact between the device and the printed-circuit board. Once the dtasheet load current exceeds the input current, the battery has to supplement the excess current and the output voltage falls just below the battery voltage by the dropout voltage of the battery FET.
Submit Documentation Feedback 15 bq www. Once the output load is reduced, such that the mA current source can pick up the output within mV of the battery, the FET turns back on.
BQ Datasheet(PDF) – TI store
Once the battery falls below the recharge threshold, the bq clears the fault and starts a new charge cycle. Pulsing this pin below 1 V, for a few microseconds, should be enough to recover.
If the DPPM-OUT voltage was set below the battery voltage, during input current limiting, the output falls directly to the battery’s voltage. Note that in datasueet mode, Q2 remains on i. The recommended capacitance is 1 nF to 10 nF.
The package includes a QFN thermal pad to provide an effective thermal contact between the device and the printed-circuit board PCB. See the Timer Fault Recovery section for additional details. If the power dissipation of the IC results in a junction temperature greater than the TJ REG threshold, the bq throttles back on the charge current in order to maintain a junction temperature around the TJ REG threshold.
The DPPM feature keeps the output from dropping below its programmed threshold, due to the battery charging current, by reducing the charging current.