DATA SHEET
BQ2945xy Overvoltage Protection For 2-Series and 3-Series Cell Li-Ion Batteries
1 Features
- 2-series and 3-series cell overvoltage monitor for secondary protection
- Fixed programmable delay timer
- Fixed OVP threshold
- Available range from 3.85 V to 4.6 V
- Fixed OVP delay option: 4 s or 6.5 s
- High-accuracy overvoltage protection:
±10 mV - Low power consumption ICC ≈ 1 µA
(VCELL(ALL) < VPROTECT) - Low leakage current per cell input < 100 nA
- Small package footprint
- 6-pin SON
2 Applications
- Second-level protection in Li-ion battery packs in:
3 Description
The BQ2945xy family of products is a secondary-level voltage monitor and protector for Li-ion battery pack systems. Each cell is monitored independently for an overvoltage condition. Based on the configuration, an output is triggered after a fixed delay if any of the two or three cells has an overvoltage condition. This output is triggered into a high state after an overvoltage condition satisfies the specified delay timer.
Device
Information
| PART NUMBER(1) | PACKAGE | BODY SIZE (NOM) |
|---|---|---|
| BQ2945xy | SON (6) | 2.00 mm × 2.00 mm |
(1) For all available packages, see the orderable addendum at the end of
the data sheet.
Simplified Schematic4 Revision History
Changes from Revision J (June 2022) to Revision K (August 2022)
- Changed the BQ294534 device to Production DataGo
- Changed the BQ294534 device to Production Data in the Section 7.5 Go
Changes from Revision I (May 2021) to Revision J (June 2022)
- Added the PRODUCT PREVIEW BQ294534 deviceGo
- Added the PRODUCT PREVIEW BQ294534 device to the Section 7.5 Go
Changes from Revision H (December 2017) to Revision I (May 2021)
- Changed the BQ294506 device to Production DataGo
Changes from Revision G (November 2017) to Revision H (December 2017)
- Added the BQ294506 deviceGo
- Added the BQ294506 device to the Section 7.5 Go
- Added the BQ294506 OVP accuracy of +/–7 mV at 25°CGo
5 Device Comparison Table
| TA | PART NUMBER | OVP (V) | DELAY TIME (s) |
|---|---|---|---|
| –40°C to +110°C | BQ294502 | 4.35 | 4 |
| BQ294504 | 4.35 | 6.5 | |
| BQ294506 | 4.38 | 4 | |
| BQ294512 | 4.4 | 4 | |
| BQ294522 | 4.45 | 4 | |
| BQ294524 | 4.45 | 6.5 | |
| BQ294532 | 4.5 | 4 | |
| BQ294533 | 4.5 | 6.5 | |
| BQ294534 | 4.55 | 4 | |
| BQ294582 | 4.225 | 4 | |
| BQ294592 | 4.3 | 4 |
