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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(PDF) bq24070 Datasheet download
It can be calculated from Equation TMR pin should not be left floating. When the output load current is reduced, the operation described is reversed as shown. TI is not responsible or liable for such altered documentation. The K TMR parameter is specified in the specifications table. 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.
Testing and other quality control techniques are used to the extent TI deems necessary to support this warranty. This is DPPM mode.
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. Products conform to specifications per the terms of the Texas Instruments standard warranty. Customers should obtain the latest relevant information before placing dztasheet and should verify that such information is current and complete.
Charge voltage above recharge threshold V RCH and timeout fault occurs. SF is the scale factor as specified in the specification table. 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.
This ensures proper hot plug power up with a no-load condition no system load or battery attached. See the section titled Power-Path Management for additional details. Reproduction of information in TI data books or data sheets is permissible only if reproduction is without alteration and is accompanied by all associated warranties, conditions, limitations, and notices.
As the IOUT load reaches 0. This small current is used to detect a battery removal condition and remains on as long as the battery voltage stays below the recharge threshold. R – taped and reeled in quantities of 3, devices per reel.
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.
The timeout is extended if the charge current is reduced by DPPM or thermal regulation. Note that OFF indicates the open-drain transistor is turned off. 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.
For example, if the peak system load is 1. Submit Documentation Feedback 13 bq www. This feature revives deeply discharged cells. If the system load exceeds the capacity of the supply, the output voltage drops down to the battery’s voltage. See Figure 7 for power up by battery insertion.
Boot-Up Sequence In order to facilitate the system start-up and USB enumeration, the bq offers a proprietary boot-up sequence. This output is turned off in the sleep mode open drain. Once the battery falls below the recharge threshold, the bq clears the fault and starts a new charge cycle.
This feature is designed to limit the power drawn from the input supply such as USB suspend mode. Table 1 summarizes the MODE pin function. Due to the charge profile of Li-xx batteries, the maximum power dissipation is typically seen at the beginning of.
As a safety dwtasheet, the bq also monitors the charge time in the charge mode. The battery charge current is then adjusted back as necessary to keep the output voltage from falling any further. The following provides some guidelines: 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.
The DPPM sustains the system voltage no matter what causes it to dataseet, if at all possible. However, the user may increase the range by adding two external resistors.
This theory is easily verified by performing a charge cycle on a discharged battery while monitoring the battery voltage and chargers power pad temperature. The bq only requires a small output capacitor for loop stability.