DocumentationDatasheet
Reliability Data
Product Selector Card
LT Journal
Software and Simulation
cad_symbol
Linduino
Features
- Indicates Accumulated Battery Charge and Discharge
- SMBus/I2C Interface
- Integrated 50mΩ High Side Sense Resistor
- ±1A Sense Current Range
- High Accuracy Analog Integration
- 1% Charge Accuracy
- Configurable Alert Output/Charge Complete Input
- 2.7V to 5.5V Operating Range
- Quiescent Current Less than 100μA
- Small 6-Pin 2mm × 3mm DFN package
Typical Application
Description
The LTC2941-1 measures battery charge state in battery-powered handheld PC and portable product applications. Its operating range is perfectly suited for single cell Li-Ion batteries. A precision coulomb counter integrates current through an internal sense resistor between the battery’s positive terminal and the load or charger. The measured charge is stored in internal registers. An SMBus/I2C interface accesses and configures the device.
The LTC2941-1 features programmable high and low thresholds for accumulated charge. If a threshold is exceeded, the device communicates an alert using either the SMBus alert protocol or by setting a flag in the internal status register.
| Integrated Sense Resistor | |
|---|---|
| LTC2941 | No |
| LTC2941-1 | Yes |
2x3 DFN-6
Package Variations and Pricing
| Part Number | Package | Pins | Temp | Price (1-99) |
Price (1k)* |
|---|---|---|---|---|---|
| LTC2941CDCB#PBF | DFN | 6 | C | $1.91 | |
| LTC2941CDCB#TRMPBF | DFN | 6 | C | $1.91 | $1.35 |
| LTC2941CDCB#TRPBF | DFN | 6 | C | $1.30 | |
| LTC2941CDCB-1#PBF | DFN | 6 | C | $2.40 | |
| LTC2941CDCB-1#TRMPBF | DFN | 6 | C | $2.41 | $1.70 |
| LTC2941CDCB-1#TRPBF | DFN | 6 | C | $1.65 | |
| LTC2941IDCB#PBF | DFN | 6 | I | $2.28 | |
| LTC2941IDCB#TRMPBF | DFN | 6 | I | $2.28 | $1.61 |
| LTC2941IDCB#TRPBF | DFN | 6 | I | $1.56 | |
| LTC2941IDCB-1#PBF | DFN | 6 | I | $2.87 | |
| LTC2941IDCB-1#TRMPBF | DFN | 6 | I | $2.88 | $2.03 |
| LTC2941IDCB-1#TRPBF | DFN | 6 | I | $1.98 | |
| LTC2941IMS8E#TRPBF | MSOP | 8 | I | $2.37 | $1.68 |
| LTC2941CMS8E#TRPBF | MSOP | 8 | C | $1.99 | $1.41 |
| LTC2941IMS8E#PBF | MSOP | 8 | I | $2.31 | $1.62 |
| LTC2941CMS8E#PBF | MSOP | 8 | C | $1.93 | $1.35 |
Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.
| Part Number | Description | Price | Documentation |
|---|---|---|---|
| DC1496B-C | LTC2941-1 Demo Board | 2.7V to 5.5V Battery Gas Gauge w/ I2C (requires DC590B) | $50.00 |
Companion Boards
| Part Number | Description | Price | Documentation |
|---|---|---|---|
| DC590B | Isolated USB Serial Controller for Linear Technology QuikEval-Compatible Demo Boards | $50.00 |