BQ25785
- TI patented quasi dual phase buck-boost narrow voltage DC (NVDC) charger for USB-C Extended Power Range (EPR) interface platform
- 3.5V to 40V input range to charge 2cell to 5cell battery
- Charge current up to 16.3A or 30A based on 5mΩ/2mΩ sensing resistor
- Input current limit up to 8.2A/16.4A based on 10mΩ/5mΩ sensing resistor
- Support USB 2.0, USB 3.0, USB 3.1, USB 3.2, USB-C power delivery and extended power range input current setting
- Input Current Optimizer (ICO) to extract max input power without overloading the adapter
- Integrated Fast Role Swap (FRS) feature following USB-PD specification
- Seamless transition between quasi dual phase buck, buck-boost, and boost operations
- Single phase buck-boost flexibility through MODE pin configuration
- Input current and voltage regulation (IINDPM and VINDPM) against source overload
- Battery supplements system when adapter is fully loaded
- TI-patented dual random spread spectrum (DRSS) for meeting IEC-CISPR 32 EMI specification
- TI-patented Pass Through Mode (PTM) for >99% efficiency and battery fast charging support
- IMVP8/IMVP9 compliant system features for Intel platform
- Enhanced Vmin Active Protection (VAP) mode supplements battery from input capacitors during system peak power spike following latest Intel specification
- Comprehensive PROCHOT profile
- Two level discharge current limit PROCHOT profile to avoid battery wear out
- System power monitor (PSYS)
- Input and battery current monitor through dedicated pins
- Integrated 16-bit ADC to monitor voltage, current and power
- Battery MOSFET ideal diode operation in supplement mode
- Power up USB port from battery (USB OTG)
- 3V to 38V OTG
- Output current limit up to 8.2A based on 10mΩ sensing resistor
- 600kHz or 800kHz programmable switching frequency with 2.2µH or 1.5µH inductor
- SMBus host control interface for flexible system configuration
- High accuracy for the regulation and monitor
- ±0.5% Charge voltage regulation
- ±2.5% Charge current regulation
- ±2% Input current regulation
- ±2% Input/charge current monitor
- Safety
- Thermal regulation and thermal shutdown
- Input, system, battery overvoltage protection
- Input, MOSFET, inductor overcurrent protection
- Package: 36-Pins 4.0mm × 5.0mm WQFN
The BQ25785 is a synchronous NVDC buck-boost battery charge controller to charge a 2cell to 5cell battery from a wide range of input sources including USB adapter, extended power range (EPR) USB-C Power Delivery (PD) sources, standard power range (SPR) USB-C Power Delivery (PD) sources and traditional adapters. The device offers a low component count, high efficiency design for space-constrained, 2cell to 5cell battery charging applications.
The NVDC configuration allows the system to be regulated based on battery voltage, but not drop below system minimum voltage. The system keeps operating even when the battery is completely discharged or removed. When load power exceeds input source rating, the battery goes into supplement mode and prevents the system from crashing.
During power up, the charger sets the converter to a buck, boost, or buck-boost configuration based on the input source and battery conditions. The charger seamlessly transits between the buck, boost, and buck-boost operation modes without host control. The TI-patented quasi-dual phase converter can interleave dual phase under high power buck mode helping thermal distribution and reduce each inductor size. Simultaneously, the device only needs two boost side switching MOSFETs to save overall system area and cost due to limited power operation under boost mode.
In the absence of an input source, the BQ25785 supports the USB On-the-Go (OTG) function.
When only a battery powers the system and no external load is connected to the USB OTG port, the BQ25785 implements the latest Intel Vmin Active Protection (VAP) feature, in which the device charges up the VBUS voltage from the battery to store some energy in the input decoupling capacitors. During a system peak power spike, the energy stored in the input capacitors supplements the system, to prevent the system voltage from dropping below the minimum system voltage and causing a system crash.
The BQ25785 monitors adapter current, battery current, and system power. The flexibly programmable PROCHOT output goes directly to the CPU for throttling back when needed.
The latest version of the USB-C PD specification includes Fast Role Swap (FRS) to provide power role swapping occurs in a timely fashion so that the devices connected to the dock can avoid experiencing momentary power loss or glitching. This device integrates FRS in compliance with the PD specification.
TI-patented switching frequency dithering pattern can significantly reduce EMI noise over the whole conductive EMI frequency range (150kHz to 30MHz). Multiple dithering scale options are available and provide flexibility for different applications. The dithering feature greatly simplify EMI noise filter design.
The charger operates with the TI-patented Pass Through Mode (PTM) to improve efficiency over the full load range. In PTM, input power directly pass through the charger to the system. Switching losses of the MOSFETs and inductor core loss can be saved thus achieving high efficiency operation.
The BQ25785 is available in a 36-pin 4mm × 5mm WQFN package.
技術文件
| 重要文件 | 類型 | 標題 | 格式選項 | 日期 |
|---|---|---|---|---|
| * | Data sheet | BQ25785 40V, SMBus, 2- to 5Cell, Narrow VDC Quasi Dual Phase Buck-Boost Battery Charge Controller With System Power Monitor and Processor Hot Monitor datasheet | PDF | HTML | 2026年 3月 3日 |
設計與開發
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BQ25785EVM — BQ25785 評估模組
| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| WQFN (REE) | 36 | Ultra Librarian |
訂購與品質
- RoHS
- REACH
- 產品標記
- 鉛塗層/球物料
- MSL 等級/回焊峰值
- MTBF/FIT 估算值
- 材料內容
- 認證摘要
- 進行中的可靠性監測
- 晶圓廠位置
- 組裝地點
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。