BQ24745RHDTG4 - English Editing Encyclopedia Entry

Product Overview

Category

BQ24745RHDTG4 belongs to the category of power management integrated circuits (PMICs).

Use

This PMIC is primarily used for battery charging and system power management in portable electronic devices.

Characteristics

• Efficient and compact design
• High charging efficiency
• Wide input voltage range
• Multiple protection features
• Flexible charging profiles

Package

BQ24745RHDTG4 is available in a small outline package (SOT) with a thermal pad for enhanced heat dissipation.

Essence

The essence of BQ24745RHDTG4 lies in its ability to efficiently manage battery charging and power distribution in portable electronic devices, ensuring optimal performance and safety.

Packaging/Quantity

This PMIC is typically packaged in reels or tubes, with a quantity of 2500 units per reel/tube.

Specifications

• Input Voltage Range: 3.5V to 24V
• Output Voltage Range: 2.5V to 25.2V
• Charging Current Range: Up to 8A
• Operating Temperature Range: -40°C to 85°C
• Efficiency: Up to 95%
• Protection Features: Overvoltage, overcurrent, short circuit, and thermal protection

Detailed Pin Configuration

1. VIN: Input voltage pin
2. GND: Ground pin
3. ACOK: AC adapter present output pin
4. PGOOD: Power good output pin
5. TS: Thermistor input pin for temperature monitoring
6. BAT: Battery voltage sense pin
7. SRN: System reset output pin
8. SDA: I2C data pin
9. SCL: I2C clock pin
10. VDD: Supply voltage pin
11. VSS: Ground pin
12. ILIM: Charging current limit programming pin
13. TS2: Second thermistor input pin
14. SDA2: Second I2C data pin
15. SCL2: Second I2C clock pin

Functional Features

1. Battery Charging Management: BQ24745RHDTG4 provides a comprehensive set of charging profiles, including constant current (CC), constant voltage (CV), and pre-charge modes. It supports fast charging protocols such as USB PD and Qualcomm Quick Charge.

2. Power Path Management: The PMIC enables seamless power delivery to the system while simultaneously charging the battery. It intelligently switches between input sources (AC adapter or battery) based on availability and prioritization.

3. Dynamic Power Management: BQ24745RHDTG4 optimizes power distribution by dynamically adjusting the charging current and voltage levels based on system requirements, battery status, and thermal conditions.

4. Protection Mechanisms: The PMIC incorporates various protection features like overvoltage, overcurrent, short circuit, and thermal protection to safeguard the battery and the system from potential damage.

Advantages and Disadvantages

Advantages

• High charging efficiency ensures faster charging times.
• Wide input voltage range allows compatibility with various power sources.
• Multiple protection features enhance safety and reliability.
• Flexible charging profiles support different battery chemistries and charging protocols.

Disadvantages

• Limited output voltage range may not be suitable for certain applications requiring higher voltages.
• Complex pin configuration may require careful attention during PCB layout and assembly.

Working Principles

BQ24745RHDTG4 operates by monitoring the input voltage, battery voltage, and system load conditions. It intelligently adjusts the charging current and voltage levels to optimize battery charging and power delivery to the system. The PMIC constantly monitors the temperature and protects against potential hazards by activating the appropriate protection mechanisms.

Detailed Application Field Plans

BQ24745RHDTG4 finds applications in a wide range of portable electronic devices, including: - Smartphones and tablets - Laptops and ultrabooks - Portable gaming consoles - Wearable devices - Portable medical equipment

Detailed and Complete Alternative Models

1. BQ24725RGRR: Similar functionality with a different pin configuration.
2. BQ24735RGRR: Higher charging current capability but with a slightly larger package size.
3. BQ25703ARGRR: Advanced PMIC with additional features like USB Type-C support and power path management for dual batteries.

(Note: The list above is not exhaustive and other alternative models may exist.)

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