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BQ77904 Datasheet Preview

BQ77904 Datasheet

Stackable Lithium-Ion Battery Protector

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BQ77904, BQ77905
SLUSCM3I – JUNE 2016 – REVISED DECEMBER 2019
BQ77904, BQ77905 3-Series to 20-Series Ultra Low-Power Voltage, Current, Temperature,
and Open-Wire Stackable Lithium-Ion Battery Protector
1 Features
1 NORMAL mode: 6 µA (BQ77904 and BQ77905)
• Full suite of voltage, current, and temperature
protections
• Scalable cell count from 3 series to 20 series or
more
• Voltage protection (accuracy ±10 mV)
– Overvoltage: 3 V to 4.575 V
– Undervoltage: 1.2 V to 3 V
• Open cell and open-wire detection (OW)
• Current Protection
– Overcurrent discharge 1: –10 mV to –85 mV
– Overcurrent discharge 2: –20 mV to +170 mV
– Short circuit discharge: –40 mV to +340 mV
– Accuracy ±20% for 20 mV, ±30% for > 20
mV across full temperature
• Temperature protection
– Overtemperature charge: 45°C or 50°C
– Overtemperature discharge: 65°C or 70°C
– Undertemperature charge: –5°C or 0°C
– Undertemperature discharge: –20°C or –10°C
• Additional Features
– Independent charge (CHG) and discharge
(DSG) FET drivers
– 36-V absolute maximum rating per cell input
– Built-in-self-test functions for high reliability
• SHUTDOWN mode: 0.5-µA maximum
2 Applications
Power tools, garden tools
Start-stop battery packs
Lead-acid (PbA) replacement batteries
Light electric vehicles
Energy storage systems, uninterruptible power
supplies (UPS)
10.8-V to 72-V packs
3 Description
The BQ77904 and BQ77905 devices are low-power
battery pack protectors that implement a suite of
voltage, current, and temperature protections without
microcontroller (MCU) control. The device's stackable
interface provides simple scaling to support battery
cell applications from 3 series to 20 series or more.
Protection thresholds and delays are factory-
programmed and available in a variety of
configurations. Separate overtemperature and
undertemperature thresholds for discharge (OTD and
UTD) and charge (OTC and UTC) are provided for
added flexibility.
The device achieves pack protection through the
integrated independent CHG and DSG low-side
NMOS FET drivers, which may be disabled through
two control pins. These control pins may also be used
to achieve cell protection solutions for higher series
(6 series and beyond) in a simple and economical
manner. To do this, simply cascade a higher device
CHG and DSG outputs to the immediate lower device
control pins. For a reduced component count, all
protection faults use internal delay timers.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
BQ77904
BQ77905
TSSOP (20)
6.50 mm × 4.40 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Simplified Schematic
VDD
VC5
VTB
bq77094/5
TS
LD
Vss
SRP SRN DSG CHGU
PACK+
VDD
CTRD
CTRC
VTB
VC5
bq77094/5
TS
Vss
SRP
SRN
DSG
LD
CHG
PACK-
CCooppyyrriigghhtt©©22001177,,TTeexxaassIInnssttrruummeennttssIInnccoorrppoorraatteedd
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.




etcTI

BQ77904 Datasheet Preview

BQ77904 Datasheet

Stackable Lithium-Ion Battery Protector

No Preview Available !

BQ77904, BQ77905
SLUSCM3I – JUNE 2016 – REVISED DECEMBER 2019
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Device Comparison ............................................... 4
6 Pin Configuration and Functions ......................... 5
7 Specifications......................................................... 6
7.1 Absolute Maximum Ratings ...................................... 6
7.2 ESD Ratings.............................................................. 6
7.3 Recommended Operating Conditions....................... 6
7.4 Thermal Information .................................................. 7
7.5 Electrical Characteristics........................................... 7
7.6 Timing Requirements .............................................. 10
7.7 Typical Characteristics ............................................ 11
8 Detailed Description ............................................ 13
8.1 Overview ................................................................. 13
8.2 Functional Block Diagram ....................................... 14
8.3 Feature Description................................................. 15
8.4 Device Functional Modes........................................ 27
9 Application and Implementation ........................ 28
9.1 Application Information............................................ 28
9.2 Typical Application .................................................. 34
9.3 System Examples ................................................... 37
10 Power Supply Recommendations ..................... 37
11 Layout................................................................... 38
11.1 Layout Guidelines ................................................. 38
11.2 Layout Example .................................................... 38
12 Device and Documentation Support ................. 39
12.1 Documentation Support ....................................... 39
12.2 Receiving Notification of Documentation Updates 39
12.3 Support Resources ............................................... 39
12.4 Trademarks ........................................................... 39
12.5 Electrostatic Discharge Caution ............................ 39
12.6 Glossary ................................................................ 39
13 Mechanical, Packaging, and Orderable
Information ........................................................... 39
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision H (September 2018) to Revision I
Page
• Added the BQ7790522 device to the Device Comparison table ............................................................................................ 4
Changes from Revision G (September 2017) to Revision H
Page
• Changed some wording throughout the data sheet for clarity and conciseness ................................................................... 1
• Added the BQ7790518 device to the BQ77905 Device Comparison table............................................................................ 4
Changes from Revision F (May 2017) to Revision G
Page
• Added BQ7790511 and BQ7790512 to the Device Comparison table. ................................................................................. 4
Changes from Revision E (March 2017) to Revision F
Page
• Changed the BQ7790400 setting: OV delay from 1 s to 2 s. UV from 2800 mV to 2200 mV, UV delay from 1 s to 2
s, UV Hyst from 200 to 400 mV, UV load recovery from N to Y. OCD2 from 80 mV to 60 mV, OCD2 delay from 700
to 350 ms. SCD from 160 mV to 100 mV............................................................................................................................... 4
• Added BQ7790508 and BQ7790509 to the Device Comparison table. ................................................................................. 4
Changes from Revision D (March 2017) to Revision E
Page
• Added BQ7790505 to the Device Comparison table.............................................................................................................. 4
• Changed UTC(REC) at 5°C typ from 68.8 to 69.73 %VTB. Changed UTC(REC) at 10°C typ from 64.23 to 65.52 %VTB .. 8
2 Submit Documentation Feedback
Copyright © 2016–2019, Texas Instruments Incorporated
Product Folder Links: BQ77904 BQ77905


Part Number BQ77904
Description Stackable Lithium-Ion Battery Protector
Maker etcTI
Total Page 30 Pages
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