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.
|Country:||Republic of Macedonia|
|Published (Last):||14 October 2017|
|PDF File Size:||10.91 Mb|
|ePub File Size:||3.82 Mb|
|Price:||Free* [*Free Regsitration Required]|
All deglitch periods are a function of the timer setting and is modified in DPPM or thermal regulation modes by the percentages that the program current is reduced.
Qb24070 efficiency for charging the battery is the same for both cases. Sleep and Standby Modes The bq charger circuitry enters the low-power sleep mode if the input is removed from the circuit. This proprietary feature is designed to prevent against early or false termination. A high-level signal on this pin enables the chip, and a low-level signal disables the device and initiates the standby mode.
Following are URLs where you can obtain information on other Texas Instruments products and application solutions: 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 Datahseet REG threshold. 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.
The voltage on the ISET1 pin is directly proportional to the programmed charging current.
The dropout voltage increases proportionally to the increase in current. If a load is present that keeps the output more than mV below the battery, a short-circuit condition is declared. Submit Documentation Feedback 13 bq www. Submit Documentation Feedback 15 bq www. Short-Circuit Recovery The output can experience two types of short-circuit protection, one associated with the input and one with the battery.
Once the battery falls below the recharge threshold, the bq clears the fault and starts a new charge cycle. TS Pin Configuration Figure Specification is for monitoring charge current via the ISET1 pin during voltage regulation mode, not for a reduced fast-charge level.
The bq enters the low-power standby mode if while input power is present, the CE input is low. 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.
The package includes a QFN thermal pad to provide an effective thermal contact between the device and the printed-circuit board. The power pad should be tied to the VSS plane. In some applications depending on the power. This feature reduces the charge and discharge cycles on the battery, allows for datasheeet charge termination and allows the system to run with an absent or defective battery pack. Bq2407 ensures proper hot plug power up with a no-load condition no system load or daatsheet attached.
When the peak system load drops to 0.
If the output load exceeds the available USB current, the output instantly goes into the battery supplement mode. See Figure 5 through Figure 6. During the system peak load of 1. The bq only requires a small output capacitor for loop stability.
See Figure 7 for power up by battery insertion. The safety timer is dynamically adjusted while in DPPM mode. This feature allows the designer to select a lower power wall adapter, if the average system load is moderate compared to its peak power. This theory is easily. It’s a community-based project which helps to repair anything.
This can be accomplished by floating the DPPM pin.
The rate of discharge on the output is a function of system capacitance and load. 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 power pad should be tied satasheet the VSS plane. This feature prevents draining the battery into the bq during the absence of input supply. This theory is easily verified by performing a charge cycle on a discharged battery while monitoring the battery voltage and chargers power pad temperature.
Table 1 indicates when this feature is enabled.
Note that in sleep mode, Q2 remains on i. 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.
If an input source is not available, then the battery is selected as the source. Battery supplement current is not restricted by either datsheet regulation or shutdown. The leads should be shorted together or the device placed in conductive foam during storage or handling dataasheet prevent electrostatic damage to the MOSFET gates. The recommended capacitance is 1 nF to 10 nF.
It can be calculated from Equation Testing and other quality control techniques are used to the extent TI deems necessary to support this warranty. The DPPM sustains dtaasheet system voltage no matter what causes it to drop, if at all possible.
Production processing does not necessarily include testing of all parameters. These status pins can be used to drive LEDs or communicate to the host processor.