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 system gets its 1. Too large a capacitance on this pin too much of a delay could allow too-high currents if the output was shorted to ground.
Submit Documentation Feedback 3 bq www. The battery FET is only protected by a short-circuit limit which typically does not cause a thermal shutdown input FETs turning off by itself.
See theTimer Fault Recovery section for additional details. Battery Charge Current The bq offers on-chip current regulation with programmable set point. The device power dissipation, P, is a function of the charge rate and the voltage drop across the internal power. Reproduction of information in TI data books or data sheets bq240770 permissible only if reproduction is without alteration and datashert accompanied by all associated warranties, conditions, limitations, and notices.
The battery supplement mode has no thermal protection. This feature keeps the battery at full capacity at all times.
This output is turned off in the sleep mode open drain. The RHL package is available in the following options: The bq only requires a small output capacitor for loop stability. If an input source is not available, then the battery is selected as the source. TI is not responsible or liable for any such dtaasheet. Under USB operation, when the loads exceeds the programmed input current thresholds a similar pattern is observed.
Dynamic Power-Path Management DPPM This feature monitors the output voltage system voltage for input power loss due to brown outs, current limiting, or removal of the input supply.
BQ Datasheet PDF –
The rate of discharge on the output is a function of system capacitance and load. Factors that can greatly influence the measurement and calculation of. Battery supplement current is not restricted by either thermal regulation or shutdown. See the Timer Fault Recovery section for additional details. The recommended capacitance is datashheet nF to 10 nF.
The efficiency for charging the battery is the same for both cases. Note that charge current is dynamically adjusted during the thermal regulation or DPPM mode. The power pad should be tied to the VSS plane.
Charge is resumed when the temperature returns to the normal range. If VOUT drops to the battery voltage, the battery is able to supplement the input current to the system.
The output is regulated at 4. The most common measure of package thermal performance is. This feature allows the designer to select a lower power wall adapter, if the average system load is moderate compared to its peak power. Submit Documentation Feedback 5 bq www. All voltage values are with respect to the network ground terminal unless otherwise noted. The package includes a QFN thermal pad to provide an effective thermal contact between the device and the printed-circuit board.
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For internal compensation, the VREF pin requires a minimum 0. Turning off the active source before turning on the replacement source is referred to as break-before-make switching.
This feature 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.
This proprietary feature is designed to prevent against early or false termination. This theory is easily. The following summarizes this method: The battery charge current is then adjusted back as necessary to keep the output voltage from falling any further. Charge Profile Submit Documentation Feedback 9 bq www. Pulsing this pin below 1 V, for a few microseconds, should be enough to recover.
This could happen as a result of a load on the battery, self-discharge, or battery removal. R – taped and reeled in quantities of 3, devices per reel. This theory is easily verified by performing a charge cycle on a discharged battery while monitoring the battery voltage and chargers power pad temperature. Note that this action eliminates all safety timers, and also clears any timer fault.
The package includes a QFN thermal pad to provide an effective thermal contact between the device and the printed-circuit board PCB.
When the output load current is reduced, the operation described is reversed as shown. This product is RoHS compatible, including a lead concentration that does not exceed 0. 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. The corresponding output turns ON low when exiting sleep mode input voltage above battery voltage.
Table 1 summarizes the MODE pin function.
These are stress ratings only, and functional operation of the device at these or any other conditions beyond datawheet indicated under recommended operating conditions is not implied. The dropout voltage increases proportionally to the increase in current.
Customers are responsible for their products and applications using TI components.