Charger IC Lithium Ion/Polymer 16-WQFN (3x3)
The BQ25302RTER is a highly integrated single-cell lithium-ion and lithium-polymer battery charger and power-path management IC developed by Texas Instruments. The device is optimized for compact portable and wearable applications requiring efficient battery charging from USB or low-voltage DC power sources. It integrates a switching charger, power-path management, system voltage regulation, battery FET, and protection features into a compact package suitable for space-constrained designs.
The device supports programmable charging current and voltage regulation while maintaining high power conversion efficiency through its switching charger architecture. Integrated power-path management allows the system load to operate simultaneously while charging the battery, improving system reliability and startup behavior when the battery is deeply discharged or absent.
The BQ25302RTER includes input current limiting, thermal regulation, battery temperature monitoring support, and multiple safety timers to ensure safe charging operation. The charger automatically manages preconditioning, fast charging, charge termination, and recharge cycles for lithium-based battery chemistries. The device also supports USB-compliant input operation and includes configurable features through an I2C-compatible interface.
Its compact WQFN package and high integration level reduce external component count and PCB area, making it suitable for wearable electronics, portable medical devices, IoT products, handheld instruments, wireless accessories, and battery-powered embedded systems.
Electrical Characteristics
Input operating voltage supports standard USB and low-voltage DC input sources suitable for portable electronics applications.
Supports single-cell lithium-ion and lithium-polymer battery charging with programmable charge voltage regulation.
Integrated high-efficiency switching charger architecture minimizes power dissipation and improves thermal performance compared to linear chargers.
Programmable fast-charge current supports flexible battery capacity scaling and application-specific charging requirements.
Integrated power-path management allows simultaneous battery charging and system power delivery.
Includes programmable input current limiting to support USB current compliance and adapter protection.
Automatic charge cycle management includes precharge, fast charge, termination, and recharge operation.
Supports battery temperature qualification using external thermistor monitoring.
Integrated thermal regulation dynamically reduces charge current during high-temperature operating conditions.
Low quiescent current operation improves standby battery life in portable products.
Protection Features
Integrated overvoltage protection for input power safety.
Battery overcurrent and short-circuit protection enhance system reliability.
Thermal shutdown circuitry protects the device during excessive junction temperature conditions.
Safety timers monitor charging duration and prevent abnormal charging operation.
Input current limiting protects USB ports and weak power adapters from overload conditions.
Undervoltage lockout prevents improper operation during insufficient input supply conditions.
Interface and Control
I2C-compatible serial interface enables configuration and monitoring of charger parameters.
Status reporting supports system-level battery and charging management.
Programmable charging parameters allow firmware-controlled optimization for different battery chemistries and capacities.
Interrupt and status functions support embedded power management architectures.
Package Information
Supplied in a compact WQFN package optimized for portable and space-constrained PCB layouts.
Package design supports efficient thermal dissipation and automated surface-mount assembly processes.
RoHS-compliant and suitable for modern lead-free manufacturing requirements.
Typical Applications
Wearable electronics
Wireless earbuds and audio accessories
Portable medical devices
IoT and embedded battery-powered systems
Handheld consumer electronics
Portable instrumentation
Rechargeable sensor modules
Compact USB-powered battery charging systems
