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 current remains high at current limit and the voltage drop is large for maximum power dissipation. Note that in sleep mode, Q2 remains on i.
The dropout voltage increases proportionally to the increase in current. At this time, the load has to be removed to recover. This feature reduces the charge and discharge cycles on the battery, allows for proper charge termination and datasneet the system to run with an absent or defective battery pack.
If a load is present that keeps the output more than mV below the battery, a short-circuit condition is declared. See Figure 7 for power up by battery insertion. Testing and other quality control techniques are used to the extent TI deems necessary to support this warranty. Dynamic Power-Path Management DPPM This feature monitors the output voltage system voltage for input power loss due to brown datassheet, current limiting, or removal of the input supply. See the Timer Fault Recovery section for additional details.
Once the output 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. This theory is easily.
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If the DPPM-OUT voltage was set below the battery voltage, during input current limiting, the output falls directly to the battery’s voltage. Do not use the thermal pad as the primary ground input for the device.
This proprietary feature is designed to prevent against early or false termination. This feature gives the system priority on input power, allowing the system to power up with a deeply discharged battery pack. It does this by reducing the noncritical charging load while maintaining the maximum power output of the adaptor.
Therefore, understanding the theory that the safety time is adjusted inversely proportionately with the charge current and the battery is a current-hour rating, the safety time dynamically adjusts appropriately. To recover from this state, there is a mA current source from the battery to the output.
The power pad should be tied to the VSS plane. This theory is easily verified by performing a charge cycle on a discharged battery while monitoring the battery voltage and chargers power pad temperature.
This input is tied directly to the positive side of the battery pack. TI is not responsible or liable for any such statements. Factors datasheeh can greatly influence the measurement and calculation of.
Too large a capacitance on this pin too much of a datadheet could allow too-high currents if the output was shorted to ground. The power pad should be tied to the VSS plane.
Reproduction of information in Satasheet data books or data sheets is permissible only if reproduction is without alteration and is accompanied by all associated warranties, conditions, limitations, and notices.
Datashet Recovery The output can experience two types of short-circuit protection, one associated with the input and one with the battery. To avoid false termination, the termination detect function is disabled while in this mode. It’s a community-based project which helps to repair anything.
T – taped and reeled in quantities of devices per reel. Production processing does not necessarily include testing of all parameters.
The IC design is focused on supplying continuous power to the system when available from the AC adapter or battery sources. This feature is designed to limit the power drawn from the input supply such as USB suspend mode. Submit Documentation Feedback 15 bq www. Because the charge current typically is programmed for more current than the USB current limit allows, the output voltage drops to the battery voltage or DPPM voltage, whichever is higher.
BQ Datasheet(PDF) – TI store
The output, VOUT, is regulated to 4. This short-circuit disable feature was implemented mainly for power up when inserting a battery. When input current remains below 2 A, the battery charging current may be raised until the thermal regulation limits the charge current.
This feature prevents draining the battery into the bq during the absence of input supply. This ensures proper hot plug power up with a no-load condition no system load bq2407 battery attached.
Boot-Up Sequence In order to facilitate the system start-up and USB enumeration, the bq offers a proprietary boot-up sequence. As the IOUT load reaches 0.