BQ21061YFPR

The BQ21061 is a highly integrated battery charging management IC that integrates the most commonly used functions suitable for wearable devices, portable devices, and small medical devices, namely a charger, a stable output voltage rail for system power, an LDO, and a button controller. The BQ21061 IC integrates a linear charger with PowerPath, which can charge small batteries quickly and accurately while providing a stable voltage for the system. The stable system voltage (PMID) output can achieve optimal system operation through I²C based on the recommended operating conditions of the downstream IC and the system load. The BQ21061 IC is a highly programmable battery management device that integrates a 500-mA linear charger for single cell Li-Ion batteries, a general purpose LDO that may be configured as a load switch, and a pushbutton controller. Through its I²C interface, the host may change charging parameters such as battery regulation voltage and charge current, and obtain detailed device status and fault information. The push-button controller allows the user to reset the system without any intervention from the host and wake up the device from Ship Mode. The BQ21061 IC integrates a linear charger that allows the battery to be charged with a programmable charge current of up to 500 mA. In addition to the charge current, other charging parameters can be programmed through I²C such as the battery regulation voltage, pre-charge current, termination current, and input current limit current. The power path allows the system to be powered from PMID, even when the battery is dead or charging, by drawing power from the IN pin. It also prioritizes the system load connected to PMID, reducing the charging current, if necessary, in order to support the load when input power is limited. If the input supply is removed and the battery voltage level is above VBATUVLO, PMID will automatically and seamlessly switch to battery power.

Applications

• Headsets, earbuds, and hearing aids
• Smartwatches and smart trackers
• Wearable fitness and activity monitors
• Blood glucose monitors

Key features

• Linear battery charger with 1.25mA to 500mA fast charge current range
• I²C-programmable battery regulation voltage from 3.6V to 4.6V in 10mV steps, ±0.5% accuracy
• Configurable termination current, down to 0.5mA
• 20V-tolerant input with 3.4V to 5.5V typical operating input voltage range
• Programmable thermal charging profile with fully configurable HOT, WARM, COOL, and COLD thresholds
• Power path management for system power delivery and battery charging
• I²C-programmable regulated system voltage (PMID) from 4.4V to 4.9V, with battery voltage tracking and input pass-through options
• Dynamic power path management optimized for charging via weak adapters
• Advanced I²C control allows host to disconnect battery or adapter as needed
• I²C-configurable load switch or LDO output up to 150mA, programmable from 0.6V to 3.7V in 100mV steps
• 10nA ship mode battery Iq
• 400nA Iq while powering system (PMID and VDD on)