1 Features
• Power path control through battery MOSFET
implementing independent system voltage instanton
with no battery or depleted battery
• 400kHz/800kHz programmable switching
frequency for high efficiency/high power density
• Buck-boost narrow voltage DC (NVDC) charger for
USB-C Power Delivery (PD) interface platform
– 3.5V to 26V input range to charge 1- to 5-cell
battery
– Charge current up to 16.2A/8.1A with 128mA/
64mA resolution based on 5mΩ/10mΩ sensing
resistor
– Input current limit up to 10A/6.35A with 100mA/
50mA resolution based on 5mΩ/10mΩ sensing
resistor
– Support USB 2.0, USB 3.0, USB 3.1 and USB
Power Delivery (PD)
– Input Current Optimizer (ICO) to extract max
input power without overloading the adapter
– Seamless transition between buck, buck-boost,
and boost operations
– Input current and voltage regulation (IINDPM
and VINDPM) against source overload
• TI patented switching frequency dithering pattern
for EMI noise reduction
• TI patented Pass Through Mode (PTM) for system
power efficiency improvement and battery fast
charging achieving 99% efficiency.
• Input and battery current monitor through
dedicated pins
• Integrated 8-bit ADC to monitor voltage, current
and power
• Battery MOSFET ideal diode operation in
supplement mode to support system when adapter
is fully loaded
• Power up USB port from battery (USB OTG)
– 3V to 24V OTG with 8mV resolution
– Output current limit up to 12.7A/6.35A with
100mA/50mA resolution based on 5mΩ/10mΩ
sensing resistor
• I2C host control interface for flexible system
configuration
• High accuracy for the regulation and monitor
– ±0.5% Charge voltage regulation
– ±3% Charge current regulation
– ±2.5% Input current regulation
– ±2% Input/charge current monitor
• Safety
– Thermal shutdown
– Input, system, battery overvoltage protection
– Input, MOSFET, inductor overcurrent protection
• Safety-Related Certifications
– IEC 62368-1 CB Certification
• Package: 32-Pin 4.0mm × 4.0mm WQFN

2 Applications
• Oxygen concentrator, ventilators,vacuum robot
• Tablet (multimedia), wireless speaker

3 Description
The BQ25730 is a synchronous NVDC buck-boost
battery charge controller to charge a 1- to 5-cell
battery from a wide range of input sources including
USB adapter, high voltage USB-C Power Delivery
(PD) sources, and traditional adapters. It offers a low
component count, high efficiency solution for space
constrained, 1- to 5-cell battery charging applications.
The Narrow VDC buck-boost architecture avoid direct
power path from input source to system voltage
which implements wide input voltage range and
narrow system voltage range at same time. Narrow
system voltage range is valuable for faster battery
supplement and lower MOSFET rating for next stage
converter.