Texas Instruments BQ25731 Handleiding

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BQ25731 I

2

C 1- to 5-Cell Buck-Boost Battery Charge Controller with USB-C PD 3.0

OTG Output

1 Features

•No battery MOSFET for saving cost and high

efficiency

•400-kHz/800-kHz programmable switching

frequency for high efficiency/high power density

•Buck-boost charger for USB-C Power Delivery

(PD) interface platform

–3.5-V to 26-V input range to charge 1- to 5-cell

battery

–Charge current up to 16.2 A/8.1 A with 128-

mA/64-mA resolution based on 5-mΩ/10-mΩ

sensing resistor

–Input current limit up to 10 A/6.35 A with 100-

mA/50-mA resolution based on 5-mΩ/10-mΩ

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

•Support independent comparator logic with

dedicated pins

•Power up USB port from battery (USB OTG)

–3-V to 24-V OTG with 8-mV resolution

–Output current limit up to 12.7 A/6.35 A with

100-mA/50-mA resolution based on 5-mΩ/10-

mΩ sensing resistor

•I

2

C 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

•Package: 32-Pin 4.0 mm × 4.0 mm WQFN

2 Applications

•Cordless power tool

•Battery pack: cordless power tool

•Appliances: battery charger, power bank

3 Description

The BQ25731 is a synchronous 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.

During power up, the charger sets the converter to

a buck, boost, or buck-boost configuration based on

the input source and battery conditions. The charger

seamlessly transits between the buck, boost, and

buck-boost operation modes without host control.

Device Information

PART NUMBERPACKAGE

(1)

BODY SIZE (NOM)

BQ25731WQFN (32)4.00 mm × 4.00 mm

(1)For all available packages, see the orderable addendum at

the end of the data sheet.

Host (I2C)

IIN/VIN, VBAT/ ICHG,IOTG/

VOTG

CHRG_OK,IBAT, IADPT

BQ25731

ACN

VBUS

HIDRV1

SRN

BATT

(1S-5S)

LODRV1

SW1

SW2

LODRV2

HIDRV2

SRP

ACP

SYS

Q1

Q2

Q3

Q4

VBUS

3.5V-26V

Application Diagram

BQ25731

SLUSE66A – JUNE 2020 – REVISED JANUARY 2021

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

Product specificaties