BQ2944L0DRBT - English Editing Encyclopedia Entry

Product Overview

Category

The BQ2944L0DRBT 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.

Characteristics

• Voltage range: 2.5V to 4.8V
• Low quiescent current: 10µA (typical)
• High accuracy voltage detection: ±25mV
• Overcharge detection voltage: 4.35V to 4.55V (in 10mV steps)
• Overdischarge detection voltage: 2.3V to 3.0V (in 100mV steps)
• Short-circuit detection delay time: 5ms to 20ms (in 1ms steps)

Package

The BQ2944L0DRBT comes in a small outline package (SOT-23-6) which is compact and suitable for space-constrained applications.

Essence

The essence of the BQ2944L0DRBT lies in its ability to safeguard lithium-ion and lithium-polymer batteries by monitoring their voltage levels and preventing potential damage caused by overcharging, over-discharging, or short-circuiting.

Packaging/Quantity

The BQ2944L0DRBT is typically available in reels containing 3000 units per reel.

Specifications

• Operating temperature range: -40°C to +85°C
• Supply voltage range: 2.5V to 4.8V
• Quiescent current: 10µA (typical)
• Overcharge detection voltage accuracy: ±25mV
• Overdischarge detection voltage accuracy: ±100mV
• Short-circuit detection delay time accuracy: ±1ms

Detailed Pin Configuration

The BQ2944L0DRBT has six pins arranged as follows:

```

---

| | --| VDD GND |-- Pin 1: Ground (GND) --| SDA SCL |-- Pin 2: Serial Data (SDA) --| SCL SDA |-- Pin 3: Serial Clock (SCL) --| VSS VDD |-- Pin 4: Supply Voltage (VDD) --| OUT RST |-- Pin 5: Output (OUT) --| RST OUT |-- Pin 6: Reset (RST) |___________| ```

Functional Features

1. Overcharge Protection: Monitors the battery voltage and disconnects the charging circuit when it exceeds a predefined threshold, preventing overcharging.
2. Overdischarge Protection: Detects low battery voltage and disconnects the load to prevent excessive discharge, which can damage the battery.
3. Short-Circuit Protection: Quickly detects and disconnects the battery from the load in case of a short circuit, preventing potential damage to the battery and surrounding components.
4. Reset Function: Allows for manual reset or automatic recovery after protection triggers.

Advantages and Disadvantages

Advantages

• High accuracy voltage detection ensures precise protection thresholds.
• Low quiescent current minimizes power consumption.
• Compact package size enables integration into space-constrained designs.
• Reset function provides flexibility in system control.

Disadvantages

• Limited voltage range may not be suitable for all battery types.
• Requires external components for complete battery protection.
• May require additional circuitry for temperature monitoring or balancing in advanced battery management systems.

Working Principles

The BQ2944L0DRBT operates by continuously monitoring the battery voltage through its internal voltage detection circuit. When the voltage exceeds the overcharge threshold, the IC disconnects the charging circuit to prevent further charging. Similarly, when the voltage drops below the overdischarge threshold, the IC disconnects the load to prevent excessive discharge. In case of a short circuit, the IC quickly detects the abnormal current and disconnects the battery from the load. The reset function allows for manual or automatic recovery after protection triggers.

Detailed Application Field Plans

The BQ2944L0DRBT is widely used in various portable electronic devices powered by lithium-ion or lithium-polymer batteries. Some common application fields include:

1. Smartphones and tablets
2. Laptops and notebooks
3. Portable gaming consoles
4. Power banks and chargers
5. Electric vehicles and hybrid electric vehicles (HEVs)
6. Uninterruptible power supplies (UPS)
7. Solar energy storage systems

Detailed and Complete Alternative Models

1. BQ2970: Offers additional features such as temperature monitoring and balancing for advanced battery management systems.
2. BQ2920: Provides similar battery protection functionality but with a wider voltage range