Description:

The BQ25730 is a synchronous NVDC buck-boost battery charge controller that charges 1- to 5-cell batteries from a wide range of input sources, including USB adapters, high-voltage USB-C Power Delivery (PD) sources, and legacy adapters. It provides a high-efficiency solution with a small component count for space-constrained 1- to 5-cell battery charging applications. The narrow VDC buck-boost architecture avoids a direct power path from the input source to the system voltage, thereby enabling both a wide input voltage range and a narrow system voltage range. The narrow system voltage range is important for speeding up battery charging and lowering the MOSFET ratings of the downstream converters.

Features:

• Power path control through battery MOSFETs, enabling instant system power-on without a battery or with a deeply discharged battery

• 400kHz/800kHz programmable switching frequency for high efficiency and high power density

• Buck-boost narrow voltage DC (NVDC) charger for USB-C Power Delivery (PD) interface platforms

– Input range from 3.5V to 26V, supporting 1- to 5-cell battery charging

– Charge current up to 16.2A/8.1A with 128mA/64mA resolution, based on 5mΩ/10mΩ sense resistors

– Input current limit up to 10A/6.35A with 100mA/50mA resolution, based on 5mΩ/10mΩ sense resistors

– Supports USB 2.0, USB 3.0, USB 3.1, and USB Power Delivery (PD)

– Input Current Optimizer (ICO) to extract maximum input power without overloading the adapter

– Seamless transition between buck, buck-boost, and boost operation modes

– Provides input current and voltage regulation (IINDPM and VINDPM) to prevent power source overload

• TI-patented switching frequency dithering mode for EMI noise reduction

• TI-patented Pass-Through Mode (PTM) to improve system power efficiency and achieve 99% battery fast charging

• Input and battery current monitoring through dedicated pins

• Integrated 8-bit ADC for monitoring voltage, current, and power

• Battery MOSFET ideal diode operation in supplement mode to support the system when the adapter is fully loaded

• USB On-The-Go (OTG) capability from battery to USB port

– 3V to 24V OTG output with 8mV resolution

– Output current limit up to 12.7A/6.35A with 100mA/50mA resolution, based on 5mΩ/10mΩ sense resistors

• Flexible system configuration via I²C host control interface

• High-accuracy regulation and monitoring

– ±0.5% charge voltage regulation

– ±3% charge current regulation

– ±2.5% input current regulation

– ±2% input/charge current monitoring

• Safety features

– Thermal shutdown

– Input, system, and battery overvoltage protection

– Input, MOSFET, and inductor overcurrent protection

• Safety-related certification – IEC 62368-1 CB certified

• Package: 32-pin, 4.0mm × 4.0mm WQFN

Applications:

• Oxygen concentrators, ventilators, robotic vacuum cleaners

• Tablets (multimedia), wireless speakers