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.