BQ25505RGRT - English Editing Encyclopedia Entry

Product Overview

Category

The BQ25505RGRT belongs to the category of integrated circuits (ICs) and specifically falls under the power management ICs.

Use

This IC is primarily used for energy harvesting applications, where it enables the efficient extraction and storage of energy from ambient sources such as solar panels, thermoelectric generators, or piezoelectric elements.

Characteristics

• Low-power design: The BQ25505RGRT is designed to operate with ultra-low power consumption, making it suitable for energy-constrained applications.
• Energy harvesting optimization: It incorporates features like maximum power point tracking (MPPT) and cold-start capability to enhance energy harvesting efficiency.
• Integrated power management: The IC integrates a boost converter, low-dropout regulator (LDO), and battery management circuitry, simplifying system design and reducing external component count.

Package and Quantity

The BQ25505RGRT is available in a small 24-pin VQFN package. It is typically sold in reels, with a quantity of 2500 units per reel.

Specifications

• Input voltage range: 80mV to 5.5V
• Output voltage range: 2.35V to 5.3V
• Maximum output current: 100mA
• Quiescent current: 330nA
• Operating temperature range: -40°C to +85°C

Pin Configuration

The BQ25505RGRT features a total of 24 pins, each serving a specific function. Here is a detailed pin configuration:

1. VIN: Input voltage pin
2. GND: Ground reference
3. VBAT: Battery voltage output
4. LBO: Low battery output
5. CE: Chip enable input
6. STAT: Status output
7. INT: Interrupt output
8. VSTOR: Storage capacitor voltage output
9. VSS: Ground reference
10. VDD: Supply voltage input
11. VOUT: Boost converter output
12. PGND: Power ground
13. BATFET: Battery FET control
14. TS: Thermistor input
15. VREF: Reference voltage output
16. VREGIN: Regulated input voltage
17. VBATSENSE: Battery voltage sense input
18. VSTORSENSE: Storage capacitor voltage sense input
19. VSTORCTRL: Storage capacitor voltage control
20. VSTORCTRL: Storage capacitor voltage control
21. VSTORCTRL: Storage capacitor voltage control
22. VSTORCTRL: Storage capacitor voltage control
23. VSTORCTRL: Storage capacitor voltage control
24. VSTORCTRL: Storage capacitor voltage control

Functional Features

The BQ25505RGRT offers several functional features that enhance its performance and usability:

1. Maximum Power Point Tracking (MPPT): The IC dynamically adjusts the input impedance to maximize power extraction from the energy source.
2. Cold-Start Capability: It can start up and operate with extremely low input voltages, enabling efficient energy harvesting even in challenging conditions.
3. Integrated Battery Management: The IC includes a battery charger and protection circuitry, ensuring safe and optimized charging of connected batteries.
4. Low-Power Sleep Mode: When not actively harvesting energy, the IC enters a low-power sleep mode, further reducing power consumption.

Advantages and Disadvantages

Advantages

• High energy harvesting efficiency
• Compact and integrated design reduces external component count
• Wide input voltage range enables compatibility with various energy sources
• Cold-start capability ensures operation in low-energy environments

Disadvantages

• Limited maximum output current may restrict certain high-power applications
• Requires careful consideration of input and output voltage compatibility

Working Principles

The BQ25505RGRT operates based on the principles of energy harvesting and power management. It utilizes an integrated boost converter to step up the low input voltage from the energy source to a higher usable voltage level. The MPPT algorithm optimizes power extraction by dynamically adjusting the input impedance.

The IC also incorporates a battery charger and protection circuitry, allowing efficient charging and safe operation of connected batteries. When not actively harvesting energy, the IC enters a low-power sleep mode to minimize power consumption.

Application Field Plans

The BQ25505RGRT finds applications in various fields where energy harvesting is essential. Some potential application areas include:

1. Wireless Sensor Networks: The IC can power wireless sensor nodes using harvested energy, eliminating the need for frequent battery replacements.
2. Internet of Things (IoT): Energy harvesting with the BQ25505RGRT enables self-powered IoT devices, reducing maintenance efforts and enhancing sustainability.
3. Wearable Electronics: The IC can be used to harvest energy from body movements or solar radiation, providing a reliable power source for wearable devices. 4