BQ25504RGTT

Product Overview

Category

BQ25504RGTT belongs to the category of integrated circuits (ICs) used in power management applications.

Use

This IC is specifically designed for energy harvesting and power management in low-power systems, such as wireless sensor networks and wearable devices.

Characteristics

• Ultra-low power consumption: The BQ25504RGTT is optimized for efficient energy harvesting from sources with very low power levels.
• Integrated functionality: It combines a highly efficient boost converter, an ultra-low power buck converter, and a battery charger in a single package.
• Flexible charging options: The IC supports multiple charging sources, including solar panels and thermoelectric generators.
• Low voltage operation: It can operate from input voltages as low as 80mV, making it suitable for energy harvesting from ambient sources.

Package and Quantity

The BQ25504RGTT is available in a small 16-pin QFN (Quad Flat No-Lead) package. It is typically sold in reels of 2500 units.

Specifications

• Input Voltage Range: 80mV to 5.5V
• Output Voltage Range: 2.35V to 5.3V
• Maximum Charging Current: 300mA
• Maximum Boost Converter Efficiency: 90%
• Maximum Buck Converter Efficiency: 95%
• Operating Temperature Range: -40°C to 85°C

Pin Configuration

The BQ25504RGTT has 16 pins arranged as follows:

1. VIN: Input voltage pin
2. GND: Ground pin
3. VBAT: Battery voltage output pin
4. VOUT: Output voltage pin
5. EN: Enable pin
6. STAT: Status indicator pin
7. TPS: Thermal pad connection
8. VSS: Negative supply pin
9. VSS: Negative supply pin
10. VSS: Negative supply pin
11. VSS: Negative supply pin
12. VSS: Negative supply pin
13. VSS: Negative supply pin
14. VSS: Negative supply pin
15. VSS: Negative supply pin
16. VSS: Negative supply pin

Functional Features

• Energy Harvesting: The BQ25504RGTT efficiently extracts and stores energy from ambient sources, such as solar panels or thermoelectric generators.
• Power Management: It regulates the harvested energy to power the load and charge a connected battery simultaneously.
• Battery Charging: The IC includes a built-in battery charger that supports various battery chemistries and charging profiles.
• System Protection: It incorporates features like overvoltage protection, undervoltage lockout, and thermal shutdown to safeguard the system.

Advantages and Disadvantages

Advantages

• High efficiency energy harvesting
• Integrated power management functions
• Wide input voltage range
• Flexible charging options
• Compact package size

Disadvantages

• Limited maximum charging current
• Relatively high cost compared to simpler power management solutions

Working Principles

The BQ25504RGTT operates by continuously monitoring the input voltage and harvesting energy whenever it exceeds a certain threshold. It uses a boost converter to step up the harvested energy to a higher voltage level suitable for charging the battery. Simultaneously, an ultra-low power buck converter powers the load directly from the harvested energy. The IC intelligently manages the power flow between the battery, load, and input source to maximize efficiency.

Application Field Plans

The BQ25504RGTT is widely used in various low-power applications, including: - Wireless sensor networks - Wearable devices - Internet of Things (IoT) devices - Energy harvesting systems - Remote monitoring systems

Alternative Models

• BQ25505RGTT: Similar to BQ25504RGTT but with higher maximum charging current (500mA).
• BQ25570RGTT: A more advanced version with additional features like MPPT (Maximum Power Point Tracking) and increased input voltage range.

In conclusion, the BQ25504RGTT is a highly efficient and versatile IC designed for energy harvesting and power management in low-power systems. Its integrated functionality, flexible charging options, and compact package make it an ideal choice for various applications. However, its limited charging current and relatively higher cost should be considered when selecting alternative models.