SCL

Bus

SDA

GPOUT

BIN

CPU

ADC

PACKP

Li-Ion

Cell

LDO

VDD

VSS

T

PACKN

Protection

IC

NFET NFET

1.8 V

BAT

Battery Pack

0.47 µF

1 µF

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bq27621-G1

SLUSBB3E – DECEMBER 2013 – REVISED JANUARY 2016

bq27621-G1 System-Side Fuel Gauge With Dynamic Voltage Correlation

1 Features

3 Description

The Texas Instruments bq27621-G1 is a minimally

1

•

Single-Cell Li-Ion Battery Fuel Gauge

configured microcontroller peripheral that provides

–

Resides on System Board

system-side

fuel

gauging

for

single-cell

Li-Ion

–

Supports Embedded or Removable Batteries

batteries.

The

device

requires

very

little

user

configuration and system microcontroller firmware

–

Powered Directly from Battery with Integrated

development.

LDO

The

bq27621-G1

uses

the

Dynamic

Voltage

•

Easy To Configure Fuel Gauging Based on the

Correlation algorithm for fuel gauging. This process

Dynamic Voltage Correlation Algorithm

eliminates the need for a sense resistor when

–

Reports Remaining Capacity and State of

calculating remaining battery capacity (mAh), state-

Charge (SOC) with Smoothing Filter

of-charge (%), battery voltage (mV), and temperature

–

Automatically Adjusts for Self-Discharge,

(°C).

Temperature, and Rate Changes

Battery fuel gauging with the bq27621-G1 requires

•

Microcontroller Peripheral Supports:

connections only to PACK+ (P+) and PACK– (P–) for

–

a removable battery pack or embedded battery

circuit. The tiny 9-pin, 1.62 mm × 1.58 mm, 0.5 mm

–

Configurable SOC Interrupt or

pitch YZF package is ideal for space-constrained

Battery Low Digital Output Warning

applications.

–

Internal Temperature Sensor or

Host Reported Temperature

Device Information(1)

•

Support 4.2-V, 4.3-V, and 4.35-V Chemistries

PART NUMBER

PACKAGE

BODY SIZE (NOM)

•

9-pin 1.62 × 1.58 mm, 0.5 mm pitch YZF package

BQ27621-G1

YZF (9)

1.62 mm × 1.58 mm

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

2 Applications

the end of the datasheet.

•

Smartphones, Feature Phones, and Tablets

•

Digital Still and Video Cameras

•

Handheld Terminals

•

MP3 or Multimedia Players

Simplified Schematic

1

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.