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bq25898C

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SLUSCJ7B – MARCH 2016 – REVISED APRIL 2016

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5 Description (Continued)

The bq25898C is a highly-integrated 3-A switch-mode battery charge management device for single cell Li-Ion

and Li-polymer battery. As a tiny and cost-effective device, it can also be configured as slave charger to provide

fast charging in dual charger applications.

It features fast charging with high input voltage support for a wide range of smartphone, tablet and portable

devices. Its low impedance power path optimizes switch-mode operation efficiency, reduces battery charging

time and extends battery life during discharging phase. The solution is highly integrated with input reverse-

blocking FET (RBFET,Q1), high-side switching FET (HSFET, Q2), low-side switching FET (LSFET, Q3), and

integrated charge current sensing. It also integrates the bootstrap diode for the high-side gate drive and battery

monitor for simplified system design. The I2C serial interface with charging and system settings makes the

device a truly flexible solution.

The device supports a wide range of input sources, including standard USB host port, USB charging port, and

USB compliant adjustable high voltage adapter. To set the default input current limit, the device takes the result

from detection circuit in the system, such as USB PHY device. The device is compliant with USB 2.0 and USB

3.0 power spec with input current and voltage regulation.

The default charge current is set to 0 mA (charge disabled). Once charge is enabled, the device may initiate and

complete a charging cycle with software control.

The charger provides various safety features for battery charging and system operations, charging safety timer

and overvoltage/overcurrent protections. The thermal regulation reduces charge current when the junction

temperature exceeds 120°C (programmable). The STAT output reports the charging status and any fault

conditions. The PG output indicates if a good power source is present. The INT immediately notifies host when

fault occurs.

The device is available in a 2.80 mm x 2.50 mm 42-ball DSBGA package.