Overview
The Texas Instruments BQ25505RGRR is an ultra-low power harvester power management IC designed to efficiently extract and manage power from various DC energy harvesting sources. This device is part of a new family of intelligent integrated energy harvesting solutions, specifically tailored for ultra-low power applications. It features a high-efficiency DC-DC boost charger and autonomous power multiplexor, making it ideal for systems with stringent power and operational demands, such as wireless sensor networks (WSN), solar chargers, and thermal electric generator (TEG) harvesting.
Key Specifications
| Parameter | Value |
|---|---|
| Cold-Start Voltage | VIN ≥ 600 mV |
| Continuous Energy Harvesting | From input sources as low as 100 mV |
| Quiescent Current | 325 nA |
| Ship Mode Current | < 5 nA from battery |
| Package Type | VQFN (20-pin), 3.50 mm x 3.50 mm |
| Energy Storage | Rechargeable Li-Ion batteries, thin-film batteries, super-capacitors, or conventional capacitors |
| Battery Charging and Protection | Internally set undervoltage level, user-programmable overvoltage level, battery-good output flag |
Key Features
- Ultra-low power with high-efficiency DC-DC boost charger
- Continuous energy harvesting from input sources as low as 100 mV
- Ultra-low quiescent current of 325 nA
- Input voltage regulation to prevent collapsing high-impedance input sources
- Ship mode with < 5 nA from battery
- Programmable maximum power point tracking (MPPT) for optimal energy extraction
- Autonomous power multiplexor with gate drivers for primary and secondary storage elements
- Break-before-make prevents system rail droop
- Battery-good output flag and programmable threshold and hysteresis
Applications
- Energy harvesting
- Solar chargers
- Thermal electric generator (TEG) harvesting
- Wireless sensor networks (WSN)
- Industrial monitoring
- Environmental monitoring
- Bridge and structural health monitoring (SHM)
- Smart building controls
- Portable and wearable health devices
- Entertainment system remote controls
Q & A
- What is the primary function of the BQ25505RGRR? The BQ25505RGRR is an ultra-low power harvester power management IC designed to efficiently extract and manage power from various DC energy harvesting sources.
- What is the minimum cold-start voltage for the BQ25505RGRR? The minimum cold-start voltage is VIN ≥ 600 mV.
- How low can the input voltage be for continuous energy harvesting? Continuous energy harvesting can be achieved from input sources as low as 100 mV.
- What is the quiescent current of the BQ25505RGRR? The quiescent current is 325 nA.
- What types of energy storage can the BQ25505RGRR support? It can support rechargeable Li-Ion batteries, thin-film batteries, super-capacitors, or conventional capacitors.
- Does the BQ25505RGRR have programmable battery protection features? Yes, it has internally set undervoltage levels and user-programmable overvoltage levels.
- What is the purpose of the autonomous power multiplexor? The autonomous power multiplexor switches the system load to a primary nonrechargeable battery if the secondary battery voltage falls below the user-defined VBAT_OK threshold.
- What is MPPT in the context of the BQ25505RGRR? MPPT stands for Maximum Power Point Tracking, which is integrated to optimize energy extraction from various energy harvesters.
- What are some common applications of the BQ25505RGRR? Common applications include energy harvesting, solar chargers, TEG harvesting, WSN, industrial monitoring, and more.
- How does the BQ25505RGRR prevent system rail droop? It prevents system rail droop through break-before-make switching.
