SQ64971BVKS

•        Extremely Low Battery Leakage Current and Support Shipping Mode

•        High Efficiency 2A Buck Mode Charger

ￚ Support 3.8V-14V Input Voltage range

ￚ Programmable IDPM/VDPM to support the USB and adapter

ￚ 4.0V-4.5V Adjustable Charge Voltage

ￚ Support NVDC Power Path Management

ￚ JEITA Compliance

•        Maximum 1.2A OTG Output Current

ￚ 4.5V-5.5V Adjustable Output Voltage

ￚ Selectable OTG Output Current Limit

•        Maximum 550mA on BOOST1 and BOOST2 Channel

ￚ 1.6V-6.0V Adjustable Output Voltage

ￚ Maxmium 500mA Current Limit in LDO Mode

ￚ Maxmium 550mA Current Limit in Full On Mode

•        Full BATFET Control to Support Shipping Mode, Wake Up, and System Reset

•        Up to 8A Battery Discharge Current

•        Safety

ￚ Battery Temperature Sensing for Charge and Boost Mode

ￚ Battery Charging Safety Timer

ￚ Thermal Regulation and Thermal Shutdown

ￚ Input/System Over-Voltage Protection

ￚ MOSFET Over-Current Protection

The SQ64971B is a fully-integrated switching battery charger with system power path management for single cell Li-Ion and Li-polymer battery in a wide range of TWS and other portable devices. Its low impedance power path optimizes switching conversion efficiency, reduces battery charging time and extends battery life during the discharging mode. The I²C serial interface with charging and system settings makes the device a truly flexible solution.

The power path management regulates the system voltage slightly above battery voltage but does not drop below 3.5V minimum system voltage (programmable). With this feature, the switching converter keeps working to support the system load even when the battery is completely depleted or removed. When the input current limit or voltage limit is reached, the power path management reduces the charging current to zero firstly. If the system load continues to increase, the power path discharges the battery to provide the power required by system. This supplement mode operation prevents overloading the input source.

The device initiates and completes a charging cycle without software control. It automatically detects the battery voltage and charges the battery in three phases: preconditioning, constant current and constant voltage. At the end of the charging cycle, the charger automatically terminates when the charge current is below a preset limit in the constant voltage phase. When the full battery falls below the recharge threshold, the charger will automatically start another charging cycle. SQ64971B can be compliant with JEITA spec for the 4.2V Li-Ion battery.

The SQ64971B meets USB On-the-Go operation power rating specification by supplying 5.1V(programmable) on BUS with current limit up to 1.2A(programmable).

The device also integrates 2 channel independent switches to supply 5V(programmable) to portable device with current limit up to 500mA each in LDO mode and 550mA each in full on mode.

The device provides various safety features for battery charging and system operation, including negative thermistor monitoring, charging safety timer and over-voltage / over-current protections. The thermal regulation reduces charge current when the junction temperature exceeds 110°C (programmable).

The CHRG_STAT reports the charging status and fault conditions. The PG_STAT bit in SQ64971B indicates if a good power source is present. The INT immediately notifies the host when a fault occurs.

The SQ64971B is available in CSP 2.2×2.565-30 package.