BQ24751A PDF

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Charge Enable pin, 5x5-mm QFN package? DESCRIPTION The bqA is a high-efficiency, synchronous battery charger with integrated compensation and system power selector logic, offering low component count for space-constrained multi-chemistry battery charging applications. Ratiometric charge current and voltage programming allows very high regulation accuracies, and can be either hardwired with resistors or programmed by the system power-management microcontroller using a DAC or GPIOs.

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 MOS gates. For maximum system safety, inrush-power limiting provides instantaneous response to high input voltage multiplied by current.

These features reduce battery charge current when the input power limit is reached to avoid overloading the AC adapter when supplying the load and the battery charger simultaneously. A highly-accurate current-sense amplifier enables precise measurement of input current from the AC adapter to monitor the overall system power.

C6 10? F C7 10? H C11 10? F C13 0. F C12 10? F C16 0. R9 R4 71 k? R7 k? This is connected to the ground plane by a 2x3 via matrix. LO enables charge. HI disables charge. Adapter current sense resistor, negative input. An optional 0.

Adapter current sense resistor, positive input. AC adapter to system-switch driver output. Connect both FETs as common-source. The PVCC should be connected to the common-source node to ensure that the driver logic is always active when needed. The internal gate drive is asymmetrical, allowing a quick turn-off and slower turn-on in addition to the internal break-before-make logic with respect to the BATDRV.

The output goes into linear regulation mode when the input sensed current exceeds the ACOC threshold. Adapter detected voltage set input. Adapter current set input.

Input power limit set input. Set input over voltage protection threshold. ACOV does not latch. Analog ground. Ground connection for low-current sensitive analog and digital signals. Place a 1-? This voltage could be used for ratiometric programming of voltage and current regulation. Charge voltage set reference input. Charge voltage set input. Valid adapter active-low detect logic open-drain output. Connect a k?

Battery to system switch driver output. Gate drive for the battery to system load BAT PMOS power FET to isolate the system from the battery to prevent current flow from the system to the battery, while allowing a low impedance path from battery to system and while discharging the battery pack to the system load. Connect the source of the FET to the system load voltage node.

Connect the drain of the FET to the battery pack positive node. An optional capacitor is placed from the gate to the source to slow down the switching times. The internal gate drive is asymmetrical to allow a quick turn-off and slower turn-on, in addition to the internal break-before-make logic with respect to ACDRV. Adapter current sense amplifier output. Charge current set input.

Battery voltage remote sense. Directly connect a kelvin sense trace from the battery pack positive terminal to the BAT pin to accurately sense the battery pack voltage. Place a 0. Charge current sense resistor, positive input. Logic low programs 3 cell. Logic high programs 4 cell. Floating programs 2 cell.

Learn mode logic input control pin — logic high to override system selector when adapter is present, the battery is discharged to recalibrate the battery-pack gas gauge. Power ground. Ground connection for high-current power converter node. PWM low side driver output. PWM low side driver positive 6-V supply output. Connect a 1-? PWM high side driver negative supply. Connect the 0. PWM high side driver output. PWM high side driver positive supply. Connect a 0. IC power positive supply.

Exposed pad beneath the IC. It also serves as a thermal pad to dissipate the heat. These are stress ratings only, and functional operation of the device at 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 voltages are with respect to GND if not specified. Currents are positive into, negative out of the specified terminal. Consult Packaging Section of the data book for thermal limitations and considerations of packages. Figure 8. Figure The regulation voltage is ratiometric with respect to VADC.

By limiting the adjust range to Therefore, an overall voltage accuracy as good as 0. VBATT defaults to 4.

Table 2. Consult the battery manufacturer to determine this voltage. The BAT pin is used to sense the battery voltage for voltage regulation and should be connected as close to the battery as possible, or directly on the output capacitor. Thus, for a 0. However, resistors of other values can also be used.

A larger sense-resistor value yields a larger sense voltage, and a higher regulation accuracy. However, this is at the expense of a higher conduction loss. Input Adapter Current Regulation The total input current from an AC adapter or other DC sources is a function of the system supply current and the battery charging current.

System current normally fluctuates as portions of the systems are powered up or down. Without Dynamic Power Management DPM , the source must be able to supply the maximum system current and the maximum charger input current simultaneously. The current capacity of the AC adapter can be lowered, reducing system cost. The adapter detect threshold should typically be programmed to a value greater than the maximum battery voltage and lower than the minimum-allowed adapter voltage.

The total quiescent current is less than 10? Charging begins if all the conditions are satisfied and STAT becomes valid. Adapter is detected? Adapter is not over voltage ACOV? TS is within the temperature qualification window?

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Charge Enable pin, 5x5-mm QFN package? DESCRIPTION The bqA is a high-efficiency, synchronous battery charger with integrated compensation and system power selector logic, offering low component count for space-constrained multi-chemistry battery charging applications. Ratiometric charge current and voltage programming allows very high regulation accuracies, and can be either hardwired with resistors or programmed by the system power-management microcontroller using a DAC or GPIOs. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.

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