5 Description (continued)

The BQ25302 supports 4.1-V to 6.2-V input to charge single cell batteries. The BQ25302 provides up to 2-A

continuous fast charge current to a single cell battery. The device features fast charging for portable devices. Its

input voltage regulation delivers maximum charging power to the battery from input source. The solution is highly

integrated with an input reverse-blocking FET (RBFET, Q1), high-side switching FET (HSFET, Q2), and low-side

switching FET (LSFET, Q3).

The BQ25302 features lossless integrated current sensing to reduce power loss and BOM cost with minimized

component count. It also integrates a bootstrap diode for the high-side gate drive and battery temperature

monitor to simplify system design. The device initiates and completes a charging cycle without host control. The

BQ25302 charge voltage and charge current are set by external resistors. The BQ25302 detects the charge

voltage setting at startup and charges the battery in four phases: battery short, pre-conditioning, constant

current, and constant voltage. At the end of the charging cycle, the charger automatically terminates if the

charge current is below the termination current threshold and the battery voltage is above the recharge

threshold. When the battery voltage falls below the recharge threshold, the charger will automatically start

another charging cycle. The charger provides various safety features for battery charging and system

operations, including battery temperature monitoring based on negative temperature coefficient (NTC)

thermistor, charge safety timer, input over-voltage and over-current protections, as well as battery over-voltage

protection. Pin open and short protection is also built in to protect against the charge current setting pin ICHG

accidently open or short to GND. The thermal regulation regulates charge current to limit die temperature during

high power operation or high ambient temperature conditions.

The STAT pin output reports charging status and fault conditions. When the input voltage is removed, the device

automatically enters HiZ mode with very low leakage current from battery to the charger device. The BQ25302 is

available in a 3 mm x 3 mm thin WQFN package.

www.ti.com

BQ25302

SLUSCZ3 – OCTOBER 2020

Copyright © 2020 Texas Instruments Incorporated

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Product Folder Links: BQ25302