bq27741-G1 Gauge Datasheet

bq27741-G1 Datasheet, PDF, Equivalent


Part Number

bq27741-G1

Description

Single-Cell Li-Ion Battery Fuel Gauge

Manufacture

etcTI

Total Page 30 Pages
Datasheet
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bq27741-G1
SLUSBF2C – JULY 2013 – REVISED AUGUST 2015
bq27741-G1 Single-Cell Li-Ion Battery Fuel Gauge with Integrated Protection
1 Features
1 Battery Fuel Gauge and Protector for 1-Series Li-
Ion Applications
• Microcontroller Peripheral Provides:
– Accurate Battery Fuel Gauging Supports up to
14,500 mAh
– External and Internal Temperature Sensors for
Battery Temperature Reporting
– Precision 16-Bit High-Side Coulomb Counter
with High-Side Low-Value Sense Resistor
(5 mto 20 m)
– Lifetime and Current Data Logging
– 64 Bytes of Non-Volatile Scratch Pad Flash
– SHA-1/HMAC Authentication
• Battery Fuel Gauging Based on Patented
Impedance Track™ Technology
– Models Battery Discharge Curve for Accurate
Time-To-Empty Predictions
– Automatically Adjusts for Aging, Self-
Discharge, and Temperature- and Rate-
Induced Effects on Battery
• Advanced Fuel Gauging Features
– Internal Short Detection
– Tab Disconnection Detection
• Safety and Protection:
– Over- and Undervoltage Protection with Low-
Power Mode
– Overcharging and Discharging Current
Protection
– Overtemperature Protection
– Short-Circuit Protection
– Low-Voltage Notification
– Voltage Doubler to Support High-Side
N-Channel FET Protection
• HDQ and I2C Interface Formats for
Communication with Host System
• Small 15-Ball NanoFree™ (BGA) Packaging
2 Applications
• Smartphones
• PDAs
• Digital Still and Video Cameras
• Handheld Terminals
• MP3 or Multimedia Players
3 Description
The Texas Instruments bq27741-G1 Li-Ion battery
fuel gauge is a microcontroller peripheral that
provides fuel gauging for single-cell Li-Ion battery
packs. The device requires little system
microcontroller firmware development for accurate
battery fuel gauging. The fuel gauge resides within
the battery pack or on the system’s main board with
an embedded battery (non-removable). The fuel
gauge provides hardware-based over- and
undervoltage, overcurrent in charge or discharge, and
short-circuit protections.
The fuel gauge uses the patented Impedance
Track™ algorithm for fuel gauging, and provides
information such as remaining battery capacity
(mAh), state-of-charge (%), run-time to empty
(minimum), battery voltage (mV), and temperature
(°C), as well as recording vital parameters throughout
the lifetime of the battery.
The device comes in a 15-ball BGA package
(2.776 mm × 1.96 mm) that is ideal for space-
constrained applications.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
bq27741-G1
YZF (15)
2.78 mm × 1.96 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
PACK+
Simplified Schematic
Battery Pack
HDQ
SDA
SCL
SRP
CHG
DSG
PACKP
HDQ
SDA
SCL
SRN
VPWR
VBAT
REG25
PACK–
TS
Vss
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.

bq27741-G1
bq27741-G1
SLUSBF2C – JULY 2013 – REVISED AUGUST 2015
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Device Comparison Table..................................... 3
6 Pin Configuration and Functions ......................... 3
7 Specifications......................................................... 4
7.1 Absolute Maximum Ratings ...................................... 4
7.2 ESD Ratings.............................................................. 4
7.3 Recommended Operating Conditions....................... 5
7.4 Thermal Information .................................................. 5
7.5 Power-On Reset........................................................ 6
7.6 2.5-V LDO Regulator ............................................... 6
7.7 Charger Attachment and Removal Detection ........... 6
7.8 Voltage Doubler ........................................................ 6
7.9 Overvoltage Protection (OVP) .................................. 6
7.10 Undervoltage Protection (UVP)............................... 7
7.11 Overcurrent in Discharge (OCD)............................. 7
7.12 Overcurrent in Charge (OCC) ................................. 7
7.13 Short-Circuit in Discharge (SCD) ............................ 7
7.14 Low-Voltage Charging............................................. 8
7.15 Internal Temperature Sensor Characteristics ......... 8
7.16 Internal Clock Oscillators ........................................ 8
7.17 Integrating ADC (Coulomb Counter)
Characteristics ........................................................... 8
7.18 ADC (Temperature and Cell Voltage)
Characteristics ........................................................... 8
7.19 Data Flash Memory Characteristics........................ 9
7.20 I2C-Compatible Interface Timing Characteristics .... 9
7.21 HDQ Communication Timing Characteristics ......... 9
7.22 Typical Characteristics .......................................... 11
8 Detailed Description ............................................ 12
8.1 Overview ................................................................. 12
8.2 Functional Block Diagram ....................................... 12
8.3 Feature Description................................................. 13
8.4 Device Functional Modes........................................ 16
9 Application and Implementation ........................ 22
9.1 Application Information .......................................... 22
9.2 Typical Applications ................................................ 22
10 Power Supply Recommendations ..................... 29
10.1 Power Supply Decoupling ..................................... 29
11 Layout................................................................... 29
11.1 Layout Guidelines ................................................. 29
11.2 Layout Example .................................................... 31
12 Device and Documentation Support ................. 32
12.1 Device Support...................................................... 32
12.2 Documentation Support ........................................ 32
12.3 Community Resources.......................................... 32
12.4 Trademarks ........................................................... 32
12.5 Electrostatic Discharge Caution ............................ 32
12.6 Glossary ................................................................ 32
13 Mechanical, Packaging, and Orderable
Information ........................................................... 32
4 Revision History
Changes from Revision B (April 2015) to Revision C
Page
• Changed Pin Configuration and Functions ............................................................................................................................ 3
• Changed Absolute Maximum Ratings .................................................................................................................................... 4
• Changed Recommended Operating Conditions .................................................................................................................... 5
• Changed Functional Block Diagram ..................................................................................................................................... 12
• Deleted UNDERTEMPERATURE FAULT Mode ................................................................................................................. 21
• Added Community Resources.............................................................................................................................................. 32
2 Submit Documentation Feedback
Product Folder Links: bq27741-G1
Copyright © 2013–2015, Texas Instruments Incorporated


Features Product Folder Sample & Buy Technical Documents Tools & Software Support & Community bq27741-G1 SLUSBF2C – JULY 2013 – REVISED AUGUST 2015 bq27741-G 1 Single-Cell Li-Ion Battery Fuel Gauge with Integrated Protection 1 Features •1 Battery Fuel Gauge and Protector for 1-Series LiIon Applications • Mic rocontroller Peripheral Provides: – A ccurate Battery Fuel Gauging Supports u p to 14,500 mAh – External and Intern al Temperature Sensors for Battery Temp erature Reporting – Precision 16-Bit High-Side Coulomb Counter with High-Sid e Low-Value Sense Resistor (5 mΩ to 2 0 mΩ) – Lifetime and Current Data L ogging – 64 Bytes of Non-Volatile Scr atch Pad Flash – SHA-1/HMAC Authentic ation • Battery Fuel Gauging Based on Patented Impedance Track™ Technology – Models Battery Discharge Curve for Accurate Time-To-Empty Predictions – Automatically Adjusts for Aging, SelfD ischarge, and Temperature- and RateIndu ced Effects on Battery • Advanced Fuel Gauging Features – Internal Short Detection – Tab Discon.
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