BQ25723RSNR - I2C 1-4 Cell NVDC Buck-Boost Charger | TI
MPN： BQ25723RSNR ✓ 啟用中BQ25723RSNR 概覽
A battery charge controller is a power management IC that regulates charging current and voltage into a battery pack while protecting both the battery and the system load. The NVDC power-path architecture separates the system rail from the battery voltage, allowing a system to boot and operate instantly even with a deeply discharged or absent battery. Charge controllers sit at the top of the power hierarchy in portable systems, alongside DC-DC converters, fuel gauges, and battery protection ICs.
Key features include the buck-boost charging topology, which charges the battery across the full adapter voltage range regardless of whether VIN is above or below the battery voltage, and an I2C serial interface for full programmability of charge parameters. The integrated system power monitor enables real-time voltage, current, and power telemetry, while the processor hot monitor provides input-current-based throttling signals so the host CPU can reduce load before overloading the adapter.
Technically, the BQ25723 uses TI's NVDC architecture with converter-based power path management. The USB-PD Fast Role Swap integration, compliant with the latest USB-C PD specification, ensures that power role swaps in dock and hub applications occur without momentary power loss or glitching at the device under power. This makes the part well-suited to Thunderbolt docks, USB-C monitors, and multi-port charging hubs where source-to-sink transitions must be seamless.
Typical applications include USB-C PD docks and hubs, 1-4 cell Li-ion battery-powered notebooks and tablets, portable instruments, and industrial handhelds using Lead Acid, NiMH, or LiFePO4 packs. The wide chemistry support and programmable charge profile let a single PCB design serve multiple battery variants.
Design consideration: because the buck-boost converter drives external power MOSFETs and inductor, careful attention to MOSFET selection, inductor saturation current, and thermal layout of the WQFN-32 power path is essential for reliable full-current charging.
This page synthesizes distributor availability data, drop-in family alternatives, and practical design notes not found in the manufacturer datasheet. Pricing below is quoted as of 2026-10-16.
直接替換替代品，適用於 BQ25723RSNR — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
BQ25720RSNR
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
BQ25728RSNR
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
BQ25723RSNT
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
BQ25723RSNR 規格
| 功能 | NVDC buck-boost battery charge controller |
| Battery Chemistry Support | Lead Acid, Li-Ion/Li-Polymer, LiFePO4, NiCd, NiMH, SuperCap |
| Battery Cell Count | 1 to 4 cells |
| Control Interface | I2C |
| Power Path Architecture | NVDC (Narrow VDC) power path |
| USB-C PD OTG | Yes |
| USB-PD Fast Role Swap (FRS) | Integrated, PD specification compliant |
| System Power Monitor | Yes |
| Processor Hot Monitor | Yes |
| 工作溫度 | -40C to +125C |
| 封裝 | WQFN-32 (RSN), 4x4 mm |
| 安裝類型 | Surface Mount |
| Charge Topology | Buck-Boost |
BQ25723RSNR wqfn-32 (rsn), 4x4 mm 腳位配置指南
BQ25723RSNR（wqfn-32 (rsn), 4x4 mm 封裝）的腳位配置。 腳位編號、功能與連接圖定義於製造商資料手冊中。請參閱該手冊以取得確切的封裝尺寸與焊接指引。
無詳細腳位定義資料： BQ25723RSNR.
請參閱 資料表 以查看完整腳位配置。
典型應用
BQ25723RSNR 適用於 6 應用s: USB-C PD Docks and Hubs, Notebook and Tablet Battery Charging, Industrial Handheld Instruments, Portable Test and Measurement Equipment, Medical and Portable Diagnostic Devices, SuperCap and Backup Energy Storage.
USB-C PD Docks and Hubs
The BQ25723RSNR fits USB-C dock and hub designs because it integrates USB-C PD OTG and Fast Role Swap (FRS) in compliance with the latest USB PD specification. When a user unplugs the upstream adapter, FRS lets the charger transition from sink to source within milliseconds so downstream devices avoid momentary power loss or glitching - a hard requirement for Thunderbolt and USB-C monitor docks. Placed between the USB-C VBUS input and the system power path, its NVDC architecture maintains a stable system rail independent of battery state, while the system power monitor provides VBUS voltage, current, and power telemetry to the dock MCU over I2C. The processor hot monitor signals the host to throttle before the adapter is overloaded, protecting against brownouts in high-power multi-port configurations.
推薦
Notebook and Tablet Battery Charging
The 1-4 cell NVDC buck-boost architecture of the BQ25723RSNR addresses the classic notebook power problem: the adapter voltage may be above or below the battery voltage, and the system must boot instantly regardless of battery state. The buck-boost topology charges efficiently across the entire adapter voltage range, while the NVDC power path regulates the system rail slightly above battery voltage so the CPU, display, and peripherals power up even with a deeply discharged pack. The processor hot monitor lets the EC throttle CPU load when the adapter approaches its current limit, extending usable charge power without a larger adapter. Full parameter programmability over I2C allows one charger design to serve 2-, 3-, and 4-cell Li-ion SKUs with only firmware changes.
推薦
Industrial Handheld Instruments
Industrial handhelds frequently use Lead Acid, NiMH, or LiFePO4 packs rather than standard Li-ion, and the BQ25723RSNR explicitly supports all of these chemistries per the DigiKey listing. Because charge voltage, current, and termination criteria are programmed over I2C, the same PCB can be configured in firmware for each chemistry's correct profile - constant voltage for Lead Acid, proper dV/dt handling for NiMH, or 3.6 V/cell CV for LiFePO4. The -40C to +125C operating range covers harsh industrial and outdoor environments where consumer chargers fail. The NVDC power path keeps measurement electronics alive during battery hot-swap, and the system power monitor logs input power for battery-health analytics in fleet-managed instruments.
推薦
Portable Test and Measurement Equipment
Portable test instruments benefit from the BQ25723RSNR's combination of wide chemistry support, 1-4 cell range, and power telemetry. Bench-portable scopes, analyzers, and data loggers often run from both an AC adapter and an internal pack; the buck-boost NVDC stage handles adapter voltages that straddle the battery voltage without an extra preregulator stage, saving board space and efficiency loss. The system power monitor streams real-time input voltage, current, and power over I2C, enabling the instrument firmware to log energy consumption and detect adapter degradation. The processor hot monitor allows the instrument's compute section to throttle during high-load acquisitions, preventing input overdraw when running from a limited USB-C PD source.
推薦
Medical and Portable Diagnostic Devices
Portable medical diagnostic devices require uninterrupted operation and accurate battery state reporting, both strengths of the BQ25723RSNR. The NVDC power path guarantees the system rail stays valid during battery insertion, removal, and deep discharge, which is essential for patient-attached devices that cannot tolerate power glitches. Its -40C to +125C rating supports sterilization-adjacent environments and cold-chain transport monitoring. The system power monitor provides the telemetry needed for regulatory battery-status indicators, while I2C-programmable charge profiles let one hardware platform support LiFePO4 packs chosen for their thermal stability in medical applications. FRS support also enables seamless failover to internal battery power if the docking station loses AC power mid-procedure.
推薦
SuperCap and Backup Energy Storage
The BQ25723RSNR's explicit SuperCap support per the DigiKey listing makes it suitable for backup-energy and ride-through applications such as RAID write caches, smart-meter last-gasp messaging, and industrial PLC holdup power. Supercaps require careful current limiting and voltage clamping, which the I2C-programmable charge parameters provide without external analog circuitry. The buck-boost converter efficiently charges the cap bank from adapters either above or below the terminal voltage, and the NVDC path supplies the load during both charging and discharge ramps. The system power monitor reports input power so the host can schedule cap recharging during low-power periods, while the processor hot monitor prevents adapter overdraw during the high inrush phase of a completely discharged storage bank.
推薦
推薦產品摘要
工程參考資料，適用於 BQ25723RSNR — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | BQ25720RSNR | BQ25728RSNR | BQ25723RSNT |
|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | WQFN-32 (RSN) 4x4 mm | WQFN-32 (RSN) - same | WQFN-32 (RSN) - same | WQFN-32 (RSN) - same |
| Battery Cell Count | 1-4 cells | 1-4 cells | 1-4 cells | 1-4 cells |
| Control Interface | I2C | I2C | I2C | I2C |
主要差異化特點
- Integrated USB-PD Fast Role Swap (對比BQ25720RSNR)
- Broad multi-chemistry support (對比BQ25728RSNR)
- System power monitor and processor hot monitor (對比generic single-chemistry linear chargers)
設計說明
The BQ25723RSNR is a controller, so the external buck-boost power stage sets performance limits. Select power MOSFETs whose RDS(on) and gate charge minimize conduction plus switching loss at your target charge current, and size the inductor saturation current above the peak buck-boost current with at least 20% margin. Verify sense-resistor power rating and use Kelvin connections to the SRP/SRN sense inputs for accurate current regulation and telemetry.
Estimated: junction temperature equals ambient plus (total power stage loss x theta-JA). With a 4x4 mm WQFN-32 thermal pad on a standard 4-layer PCB, use a solid ground pour on layer 2 with multiple thermal vias under the exposed pad. Confirm the exact theta-JA from the TI datasheet for your board stackup. If the processor hot monitor asserts frequently, reduce charge current over I2C rather than oversizing the adapter.
USB-PD Fast Role Swap requires the system power path and host firmware to respond within the PD timing budget; do not add large bulk capacitance or slow I2C polling on the power path monitoring loop, or VBUS may sag during role swap. Also, when configuring non-Li-ion chemistries such as Lead Acid or SuperCap, ensure the charge-termination and voltage-limit registers match the pack specification before first power-up to avoid overcharge.
合規資訊
Compliance statuses not stated in retrieved data; confirm on the TI product page quality and packing information before production release.
