BQ29312APWR - English Editing Encyclopedia Entry

Product Overview

Category

The BQ29312APWR belongs to the category of integrated circuits (ICs) specifically designed for battery protection.

Use

This IC is primarily used for protecting lithium-ion and lithium-polymer batteries from overcharging, over-discharging, and short-circuiting. It ensures the safe and efficient operation of battery-powered devices.

Characteristics

• Battery protection: Prevents overcharging, over-discharging, and short-circuiting.
• Voltage monitoring: Monitors individual cell voltages to maintain balance.
• Temperature sensing: Detects abnormal temperature conditions to prevent thermal runaway.
• Fault detection: Identifies and reports any faults in the battery system.

Package and Quantity

The BQ29312APWR is available in a small outline package (SOP) with 20 pins. It is typically sold in reels containing a quantity of 2500 units per reel.

Specifications

• Supply voltage range: 2.5V to 16V
• Operating temperature range: -40°C to +85°C
• Overvoltage threshold: Adjustable from 3V to 4.6V
• Undervoltage threshold: Adjustable from 1.8V to 3.2V
• Overcurrent threshold: Adjustable from 50mA to 500mA

Pin Configuration

The BQ29312APWR has a total of 20 pins, each serving a specific function. The detailed pin configuration is as follows:

1. VDD: Power supply input
2. GND: Ground reference
3. SDA: Serial data input/output for communication
4. SCL: Serial clock input for communication
5. ALERT: Open-drain output for fault indication
6. BATx: Battery cell voltage inputs (x = 1 to n)
7. VSS: Negative terminal of the battery pack
8. VCx: Cell voltage monitor outputs (x = 1 to n)
9. VREF: Reference voltage output
10. VDDP: Power supply input for internal circuitry
11. VSSP: Ground reference for internal circuitry
12. TS: Temperature sense input
13. PROTECT: Overcurrent protection input
14. CHG: Charge enable input
15. DSG: Discharge enable input
16. BAT: Battery pack positive terminal
17. VCC: Positive supply voltage output
18. VSSC: Ground reference for supply voltage output
19. VCCP: Positive supply voltage output for internal circuitry
20. VSSCP: Ground reference for internal circuitry

Functional Features

The BQ29312APWR offers several functional features that enhance battery protection and monitoring:

1. Overvoltage Protection: Monitors cell voltages and disconnects the charging source when any cell exceeds the predefined threshold.
2. Undervoltage Protection: Prevents excessive discharge by disconnecting the load when any cell voltage falls below the specified threshold.
3. Overcurrent Protection: Detects high current conditions and interrupts the discharge path to prevent damage to the battery.
4. Temperature Monitoring: Measures the battery temperature and triggers a safety mechanism if it exceeds the safe operating range.
5. Fault Detection: Identifies faults such as reverse polarity, short-circuits, or communication errors, and provides an alert signal.

Advantages and Disadvantages

Advantages

• Comprehensive battery protection against overcharging, over-discharging, and short-circuiting.
• Flexible threshold settings for customizable protection levels.
• Integrated temperature sensing for enhanced safety.
• Fault detection and reporting capabilities.
• Compact package size suitable for space-constrained applications.

Disadvantages

• Limited to lithium-ion and lithium-polymer battery chemistries.
• Requires external microcontroller or host system for configuration and communication.

Working Principles

The BQ29312APWR operates based on a combination of voltage, current, and temperature monitoring. It continuously measures the cell voltages, comparing them to user-defined thresholds. If any threshold is exceeded, the IC takes appropriate action to protect the battery. Additionally, it monitors the battery temperature and communicates with an external microcontroller or host system to report any faults detected.

Application Field Plans

The BQ29312APWR finds applications in various battery-powered devices, including but not limited to: - Portable electronics (smartphones, tablets, laptops) - Electric vehicles - Power tools - Medical devices - Energy storage systems

Alternative Models

For those seeking alternative options, the following integrated circuits can be considered as substitutes for the BQ29312APWR: 1. BQ29209PWR 2. BQ29412DCTR 3. MAX14920EWE+T 4. LTC6804IG-2#PBF

These alternatives offer similar battery protection features and