BQ25504
- Ultra low-power with high-efficiency DC-DC boost converter/charger
- Continuous energy harvesting from low-input sources: V IN ≥ 130 mV (Typical)
- Ultra-low quiescent current: I Q < 330 nA (Typical)
- Cold-start voltage: V IN ≥ 600 mV (typical)
- Programmable dynamic maximum power point tracking (MPPT)
- Integrated dynamic maximum power point tracking for optimal energy extraction from a variety of energy generation sources
- Input voltage regulation prevents collapsing input source
- Energy storage
- Energy can be stored to rechargeable li-ion batteries, thin-film batteries, super-capacitors, or conventional capacitors
- Battery charging and protection
- User Programmable undervoltage and overvoltage levels
- On-chip temperature sensor with programmable overtemperature shutoff
- Battery status output
- Battery good output pin
- Programmable threshold and hysteresis
- Warn attached microcontrollers of pending loss of power
- Can be used to enable or disable system loads
The BQ25504 device is the first of a new family of intelligent integrated energy harvesting nano-power management solutions that are well suited for meeting the special needs of ultra low power applications. The device is specifically designed to efficiently acquire and manage the microwatts (µW) to miliwatts (mW) of power generated from a variety of DC sources like photovoltaic (solar) or thermal electric generators. The BQ25504 is the first device of its kind to implement a highly efficient boost converter/charger targeted toward products and systems, such as wireless sensor networks (WSNs) which have stringent power and operational demands. The design of the BQ25504 starts with a DC-DC boost converter/charger that requires only microwatts of power to begin operating.
Once started, the boost converter/charger can effectively extract power from low-voltage output harvesters such as thermoelectric generators (TEGs) or single- or dual-cell solar panels. The boost converter can be started with V IN as low as 600 mV, and once started, can continue to harvest energy down to V IN = 130 mV.
The BQ25504 also implements a programmable maximum power point tracking sampling network to optimize the transfer of power into the device. Sampling the VIN_DC open-circuit voltage is programmed using external resistors, and held with an external capacitor (C REF).
For example solar cells that operate at maximum power point (MPP) of 80% of their open-circuit voltage, the resistor divider can be set to 80% of the VIN_DC voltage and the network will control the VIN_DC to operate near that sampled reference voltage. Alternatively, an external reference voltage can be provide by a MCU to produce a more complex MPPT algorithm.
The BQ25504 was designed with the flexibility to support a variety of energy storage elements. The availability of the sources from which harvesters extract their energy can often be sporadic or time-varying. Systems will typically need some type of energy storage element, such as a rechargeable battery, super capacitor, or conventional capacitor. The storage element ensures that constant power is available when needed for the systems. The storage element also allows the system to handle any peak currents that cannot directly come from the input source.
To prevent damage to a customer’s storage element, both maximum and minimum voltages are monitored against the user programmed undervoltage (UV) and overvoltage (OV) levels.
To further assist users in the strict management of their energy budgets, the BQ25504 toggles the battery good flag to signal an attached microprocessor when the voltage on an energy storage battery or capacitor has dropped below a preset critical level. This warning should trigger the shedding of load currents to prevent the system from entering an undervoltage condition. The OV, UV, and battery good thresholds are programmed independently.
All the capabilities of BQ25504 are packed into a small-footprint, 16-lead, 3-mm x 3-mm VQFN package.
技術文件
| 重要文件 | 類型 | 標題 | 格式選項 | 下載最新的英文版本 | 日期 | |
|---|---|---|---|---|---|---|
| * | 資料表 | BQ25504 Ultra Low-Power Boost Converter With Battery Management For Energy Harvester Applications datasheet (Rev. G) | PDF | HTML | 2023/8/18 | ||
| Product overview | Battery Management Solutions for Wearable and Fitness Devices (Rev. C) | 2014/8/18 | ||||
| 類比設計期刊 | Accurately measuring efficiency of ultralow-IQ devices | 2014/1/22 | ||||
| Product overview | Industry’s Most Efficient Nano Power Harvesting Solutions (Rev. A) | 2013/11/8 | ||||
| 應用說明 | Self-Powered Ambient Light Sensor Using bq25504 (Rev. A) | 2013/10/19 | ||||
| 應用說明 | Measuring Efficiency of the bq25504 Energy Harvesting Battery Charger | 2013/7/24 | ||||
| Product overview | Power Bank Charger ICs | 2013/2/25 | ||||
| 應用說明 | BQ25504 Optimization of MPPT algorithm | 2012/2/13 | ||||
| 使用指南 | Ultra Low Power Boost Converter Charger Energy Harvester (Rev. A) | 2011/10/20 |
設計與開發
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SLUC462 — Solar App Design Example V1.3, bq25504
SLURAQ1 — bq25504 Design Help v1.2
TIDA-00041 — 適用於超低功耗升壓轉換器 IC 的能源採集參考設計解決方案
This reference design is an ultra low power boost converter for energy harvesting Applications. This solution is programmed from the factory for settings compatible with most MCU’s and 3V coin cell batteries. The design is programmed to deliver a 3.1VDC maximum voltage (OV) for charging the (...)
| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| VQFN (RGT) | 16 | Ultra Librarian |
訂購與品質
建議產品可能具有與此 TI 產品相關的參數、評估模組或參考設計。