BQ25891H IC
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Product Details
Product Details:
- Part Number: BQ25891H (BQ25891HRTWR)
- Manufacturer: Texas Instruments (TI) / MaxCharge Architecture
- Function: I2C Controlled Single-Cell 5A Switch-Mode Buck Fast Charger with NVDC Power-Path Management and USB-OTG Boost
- Input Voltage Range: 3.9V to 14.0V operating range (supports up to 22V absolute maximum input tolerance)
- Fast Charge Current: Up to 5.0A fast charging capability for high-capacity Li-ion/Li-polymer batteries
- USB OTG Boost Mode: Programmable 4.5V to 5.5V output (delivering up to 2.4A for reverse charging/accessories)
- Communication: I2C Serial Interface for charging voltage, dynamic current limits, and device diagnostics
- Package / Pin Count: 24-Pin WQFN (4mm x 4mm, RTW Package with exposed bottom thermal ground pad)
- Mounting Type: Surface Mount Device (SMD)
Usage:
- Acts as the main fast-charging management and power-distribution IC in Android smartphones (including Xiaomi Redmi 13C, Poco C65, Samsung Galaxy A30 / A50 / M30, and select Infinix models).
- Implements Narrow VDC (NVDC) power-path architecture to provide instant system power to turn the phone on immediately upon plugging in the charger, even when the battery is deeply discharged or removed.
- Manages high-voltage fast charging adapters (5V, 9V, 12V) using dynamic input current and thermal protection mechanisms.
- Utilized in mobile motherboard hardware repairing to resolve issues such as dead charging, slow charging, fake charging (charging icon appears but battery percentage does not increase), VBUS/SYS power line short circuits, and device reboot loops caused by power-path failure.