BQ24075TRGTR 

BQ24075TRGTR is a highly integrated lithium battery charging management chip introduced by Texas Instruments (TI). It is specifically designed for single-cell lithium-ion (Li-Ion) or lithium-polymer (Li-Po) batteries and is widely used in portable electronic devices. Below are its detailed application scenarios and parameters:

Application Scenarios:

1. Smartphones and Tablets: Provides charging management for built-in lithium batteries.
2. Portable Medical Devices: Such as blood glucose meters, portable monitors, etc.
3. Wireless Earbuds and Wearable Devices: Such as smartwatches, fitness trackers, etc.
4. Bluetooth Devices: Such as Bluetooth speakers, Bluetooth keyboards, etc.
5. Handheld Terminals and Industrial Equipment: Such as barcode scanners, portable testing instruments, etc.

Key Parameters:

1. Input Characteristics

• Input Voltage Range: 4.35V to 6.45V (supports USB input or adapter input).
• Input Current Limit: Programmable via an external resistor, supporting input currents from 100mA to 1.5A.

2. Charging Characteristics

• Battery Type: Single-cell lithium-ion (Li-Ion) or lithium-polymer (Li-Po) battery.
• Charging Voltage: 4.2V (standard) or 4.36V (optional).
• Charging Current: Programmable via an external resistor, with a maximum charging current of 1.5A.
• Charging Modes:
  • Pre-charge: When the battery voltage is too low, it charges at a lower current.
  • Constant Current (CC): Charges at the set maximum current.
  • Constant Voltage (CV): Maintains a constant voltage when the battery is nearly fully charged.
• Charging Termination: Automatically stops charging when the charging current drops to 10% of the set value.

3. Protection Features

• Overvoltage Protection (OVP): Prevents excessive input voltage.
• Overcurrent Protection (OCP): Prevents excessive input or output current.
• Battery Temperature Monitoring: Supports NTC thermistors for monitoring battery temperature, preventing charging under overheating or overcooling conditions.
• Reverse Leakage Protection: Prevents battery discharge through the chip when not charging.

4. Other Features

• Power Path Management: Supports powering the system while charging.
• Status Indication: Outputs charging status (e.g., charging, charge complete, fault) via pins.
• Low Power Mode: Enters low power mode when not charging to reduce energy consumption.

5. Package

• Package Type: 16-pin WQFN package (3mm x 3mm).
• Operating Temperature Range: -40°C to +85°C.

Typical Application Circuit:

1. Input Power Source: USB port or adapter.
2. Battery Connection: Single-cell lithium-ion or lithium-polymer battery.
3. External Components:

• Input and output capacitors.
• Resistors for setting charging current and input current limits.
• NTC thermistor (for temperature monitoring).

Advantages:

1. High Integration: Reduces the number of external components, simplifying design.
2. Flexibility: Supports multiple input sources (USB or adapter) and programmable charging parameters.
3. Safety: Built-in multiple protection features ensure safe and reliable charging.

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