BQ25798
- High power density, high
integration buck-boost charger for 1-4 cell removable
or non-removable batteries supporting USB PD 3.0 profile.
- Integrates fourswitching MOSFETs, BATFET
- Integrates input and charging current sensing
- Highly efficient
- 750kHz or 1.5MHz switching frequencies
- 5A charging current
with 10mA resolution
- 96.5% efficient: 16V battery at 3A from 20V
- Supports a wide range of input sources
- Autonomously sampled open circuit voltage (VOC) maximum power point tracking (MPPT) for charging from a Photovoltaic panel
- 3.6V to 24V wide input operating voltage range with 30V absolute maximum rating
- Detects USB BC1.2, HVDCP and non-standard adapters
- Dual-input power mux controller (optional)
- Narrow voltage DC (NVDC) power path
- Backup Mode with Ultra-fast switchover to adjustable voltage
- Powers USB port from battery (USB
OTG)
- 2.8V to 22V OTG output voltage with 10mV resolution to support USB-PD PPS
- OTG output current regulation up to 3.32A with 40mA resolution
- Flexible autonomous and I2C mode for optimal system performance
- Integrated 16-bit ADC for voltage, current, and temperature monitoring
- Low battery quiescent current
- 17µA for battery only operation
- 500nA in Charger Shutdown Mode
- High accuracy
- -0.25% to +0.65% charge voltage regulation for 2S batteries
- ±5% charge current regulation
- ±5% input current regulation
- Safety
- Thermal regulation and thermal shutdown
- Input/battery OVP and OCP
- Converter MOSFETs OCP
- Charging safety timer
- Safety-Related Certifications:
- IEC 62368-1 CB Certification
- Package
- 29-Pin 4mm × 4mm QFN
- IEC 62368-1 CB Certification
The BQ25798 is a fully integrated switch-mode buck-boost charger for 1-4 cell Li-ion batteries and Li-polymer batteries that the user can or cannot remove from the end equipment once installed. The integration includes 4 switching MOSFETs, input and charging current sensing circuits, the battery FET and all the loop compensation of the buck-boost converter. It uses NVDC power path management, regulating the system not dropping below a configurable minimum system voltage. When system power exceeds the input source rating, battery supplement mode supports the system without overloading the input source. BQ25798 also maximizes power from photovoltaic panels using its built-in VOC scaling MPPT algorithm.BQ25798 supports ultra-fast switchover from the adapter to a converted battery voltage in Backup Mode.
技術文件
設計與開發
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BQ25798BKUPEVM — BQ25798 評估模組，採用 QFN 封裝的 I²C 控制 5-A、1 至 4 芯降壓-升壓充電器
BQ25798EVM — BQ25798 評估模組 I²C 控制、1 至 4 芯、5-A 降壓-壓充電器、雙輸入和 MPPT
USB-PD-CHG-EVM-01 — 整合式 USB Type-C® 電力傳輸 (PD) 和 2-4 芯電池 EVM 的充電參考設計
USB-PD-CHG-EVM-01 評估模組 (EVM) 可用來一起評估 BQ25798 裝置與 TPS25751 裝置。BQ25798 是採用 HOTROD (QFN) 封裝的整合式切換模式降壓升壓電池充電管理裝置，適用 3.6-24-V 輸入的 1 至 4 串聯電池芯鋰離子與鋰聚合物電池。TPS25751 為一款 USB Type-C 與 PD 控制器，可在內部供應和汲取 20-V/5-A 電流。I2C 序列介面可讓 PD 控制器驅動電池充電器，此外也可同時由主機驅動，讓此組合成為真正靈活的解決方案
TI-CHARGER-GUI — 適於與 USB2ANY 和電池充電搭配使用的 GUI 軟體評估模組
TIDA-050047 — 整合式 USB Type-C®、USB 電力輸送和 2-4 芯電池的充電參考設計
此參考設計可在 5 A 電流下充電至 20 V，無需任何外部 FET，進而大幅縮小解決方案尺寸，並降低總 BOM 成本。此外也不需要微處理器，因為 TPS25750 電力輸送 (PD) 控制器會處理與 BQ25798 電池充電器 IC 的 I2C 通訊。此 I2C 功能與 TPS25750 Web 架構 GUI 可大幅簡化韌體開發程序。
| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| VQFN-HR (RQM) | 29 | 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。