Overview
The BQ2970 series, including the BQ29706DSER, from Texas Instruments is a family of cost-effective voltage and current protection integrated circuits designed for Li-ion and Li-polymer battery cells. These devices provide accurate monitoring and trigger thresholds for overcurrent protection during high discharge or charge current operations, as well as overcharge and over-discharge conditions. The BQ2970 series is characterized by its low current consumption, making it suitable for a variety of portable electronic devices.
Key Specifications
| Parameter | Value |
|---|---|
| Input Voltage Range (Pack+) | VSS – 0.3V to 12V |
| FET Drive Outputs | CHG and DSG FET drive output |
| Voltage Sensing Accuracy for OCP | ±5mV (typical) |
| Fault Detection | Overcharge (OVP), Over-discharge (UVP), Charge Overcurrent (OCC), Discharge Overcurrent (OCD), Load Short-Circuit (SCP) |
| Operating Temperature Range | –40°C to +85°C |
| Package | 6-pin DSE (1.50mm × 1.50mm × 0.75mm) |
| Current Consumption in NORMAL Mode | ICC = 4µA |
| Current Consumption in Shutdown Mode | Iq = 100nA |
Key Features
- FET drive outputs for charge and discharge FETs
- Voltage sensing across external FETs for overcurrent protection with an accuracy of ±5mV (typical)
- Fault detection for overcharge, over-discharge, charge overcurrent, discharge overcurrent, and load short-circuit
- Zero voltage charging for depleted batteries
- Factory-programmed fault protection thresholds, including fault detection voltage thresholds, fault trigger timers, and fault recovery timers
- Low current consumption: NORMAL mode ICC = 4µA, Shutdown Iq = 100nA
Applications
- Tablet PCs
- Mobile handsets
- Handheld data terminals
Q & A
- What is the input voltage range for the BQ2970 series?
The input voltage range for the BQ2970 series is VSS – 0.3V to 12V. - What types of fault detection does the BQ2970 provide?
The BQ2970 provides fault detection for overcharge (OVP), over-discharge (UVP), charge overcurrent (OCC), discharge overcurrent (OCD), and load short-circuit (SCP). - What is the operating temperature range of the BQ2970?
The operating temperature range is –40°C to +85°C. - What is the package type and size of the BQ29706DSER?
The package type is 6-pin DSE, with dimensions of 1.50mm × 1.50mm × 0.75mm. - How much current does the BQ2970 consume in NORMAL mode and Shutdown mode?
In NORMAL mode, ICC = 4µA, and in Shutdown mode, Iq = 100nA. - What is the accuracy of voltage sensing for overcurrent protection?
The voltage sensing accuracy for overcurrent protection is ±5mV (typical). - Does the BQ2970 support zero voltage charging for depleted batteries?
Yes, the BQ2970 supports zero voltage charging for depleted batteries. - Are the fault protection thresholds programmable?
Yes, the fault protection thresholds, including fault detection voltage thresholds, fault trigger timers, and fault recovery timers, are factory-programmed. - What are some common applications of the BQ2970 series?
Common applications include tablet PCs, mobile handsets, and handheld data terminals. - How does the BQ2970 protect against short circuits?
The BQ2970 protects against short circuits through load short-circuit detection (SCP).
