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 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.
The bq powers the system while independently charging the battery. 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 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 IC design is focused on supplying continuous power to the system when available from the AC adapter or battery sources.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. Products conform to specifications per the terms of the Texas Instruments standard warranty.
Production processing does not necessarily include testing of all parameters. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOSFET gates. If an input source is not available, then the battery is selected as the source.
Table 1 summarizes the MODE pin function. The RHL package is available in the following options: R – taped and reeled in quantities of 3, devices per reel.
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T – taped and reeled in quantities of devices per reel. This product is RoHS compatible, including a lead concentration that does not exceed 0.
In addition, this product uses package materials that do not contain halogens, including bromine Br or antimony Sb above 0. Submit Documentation Feedback bq www. These are stress ratings only, and functional operation of the device catasheet these or any other conditions beyond those indicated under recommended operating conditions is not implied.
Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. All voltage values are with respect to the network ground terminal unless otherwise noted. Negative current is defined as current flowing into the BAT pin. Submit Documentation Feedback 3 catasheet www. The dropout voltage increases proportionally to the increase in current. 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.
When input current remains below 2 A, the battery charging current may be raised until the thermal regulation limits the charge current. Specification is for monitoring charge current via the ISET1 pin during voltage regulation mode, not for a datqsheet fast-charge level.
Submit Documentation Feedback 5 bq www. Battery supplement current is not restricted by either thermal regulation or shutdown. Input power FETs turn off during thermal shutdown.
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. The exposed thermal pad must be connected to the same potential as the VSS pin on the printed-circuit board.
Do dwtasheet use the thermal pad as the primary ground input for the device. VSS pin must be connected to ground at all times. See a typical charge profile, application circuit, and an operational flow datashret in Figure 1 through Figure 3, respectively. Charge Profile Submit Documentation Feedback 9 bq www. Boot-Up Sequence In order to facilitate the system start-up and USB enumeration, the bq offers a proprietary boot-up sequence.
Table 1 indicates when this feature is enabled. Power-Path Management The bq powers the system while independently charging the battery. This features 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 feature gives the system priority on input power, allowing the system to power up with a deeply discharged battery pack. Daatsheet feature works as follows.
Power-Path Management Case 1: The output bq240770 regulated at 4. If the system load exceeds the capacity of the supply, the output voltage drops down to the battery’s voltage. 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. The DPPM control tries to reach a steady-state condition where the system gets its needed current and the battery is bq240700 with the remaining current.
No active control limits the current to the system; therefore, if the system demands more current than the input can provide, the output voltage drops just below the battery voltage and Q2 turns on which supplements the input current to the system.
DPPM has three main advantages. This feature allows the designer to select a lower power wall adapter, if the average system load is moderate compared to its peak power. For example, if the peak system load is 1. During the system peak load of 1. The charge current is reduced until there is no further nq24070 on the output voltage. The system gets its 1. When the peak system load drops to 0. The current remains high at current limit and the voltage drop is large for maximum power dissipation.
The efficiency for charging the battery is the same for both cases. The advantages include less power dissipation, lower system temperature, and better overall efficiency. The DPPM sustains the system voltage no matter what causes it to drop, if at all possible.
It does this by reducing the noncritical charging load while maintaining the maximum power output of the adaptor. I DPPM is the internal current source. SF is the scale factor as specified in the specification table. The safety timer is dynamically adjusted while in DPPM mode.
The voltage on the ISET1 pin is directly proportional to the programmed charging current. See Figure 5 through Figure 6. The output, VOUT, is regulated to 4. The system’s power management is responsible for keeping its system load below dqtasheet USB current level selected if the battery is critically low or missing. Otherwise, the output drops to the battey voltage; therefore, the system should have a low-power mode for USB power application.
The DPPM feature keeps the output from dropping below its programmed threshold, due to the battery charging current, by reducing the charging current. 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.
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If VOUT drops to the battery voltage, the battery is able to supplement the input current to the system. Submit Documentation Feedback 13 bq www. As the IOUT load reaches 0. This is DPPM mode.
The battery charge current is then adjusted back as necessary to keep the output voltage from falling any further. 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 is the battery supplement mode.
When the output load current is reduced, the operation described is reversed as shown. If the DPPM-OUT voltage was set below the battery voltage, during input current limiting, the output falls directly to the battery’s voltage. Under USB operation, when the loads exceeds the programmed input current thresholds a similar pattern is observed. If the output load exceeds the available USB current, the output instantly goes into the battery supplement mode.
Turning off the active source before turning on the replacement source is referred to as break-before-make switching. The rate of discharge on the output is a function of system capacitance and load. 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 output returns to its regulated value, and the battery returns to its programmed current level. If a load is present that keeps the output more than mV below the battery, a short-circuit condition is declared.
At this time, the load has to be removed to recover. A capacitor can be placed on the DPPM pin to delay implementing the short-circuit mode and get unrestricted not limited current. Submit Documentation Feedback 15 bq www. The device suspends charge by turning off the power FET and holding the timer value i.
Charge is resumed when the temperature returns to the normal range. However, the user may increase the range by adding two external resistors. TS Pin Configuration Figure This feature revives deeply discharged cells. The timeout is extended if the charge current is reduced by DPPM or thermal regulation. See the Timer Fault Recovery section for additional details. Battery Charge Current The bq offers on-chip current regulation with programmable set point. The charge level may be reduced to give the system priority on input current see DPPM.
See the section titled Power-Path Management for additional details. Submit Documentation Feedback 17 bq www.