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Texas Instruments BQ25700ARSNT
- Part No.:
- BQ25700ARSNT
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
BQ25700ARSNT.pdf
- Description:
- IC BATT MON MULT-CHEM 1-4C 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:933
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Product details
Overview
BQ25700ARSNT from Texas Instruments is a synchronous NVDC buck-boost battery charge controller for 1–4-cell Li+, LiFePO₄, NiCd, NiMH, or lead-acid batteries, supporting 3.5 V to 24 V input, ±0.5% charge voltage regulation, and SMBus-hosted system power/thermal monitoring in ultra-thin notebooks and detachable tablets.
For engineers reviewing the BQ25700ARSNT datasheet, BQ25700ARSNT pinout, BQ25700ARSNT application, or BQ25700ARSNT equivalent, this page delivers verified pin functions, real-world NVDC power path behavior, PROCHOT throttling implementation details, and validated alternative options for multi-chemistry charging systems requiring seamless buck-boost transition and USB PD OTG support.
Technical Context
The BQ25700ARSNT implements a dual-phase synchronous buck-boost topology with independent high-side (HIDRV1/HIDRV2) and low-side (LODRV1/LODRV2) gate drivers, enabling automatic mode switching between buck, boost, and buck-boost based on real-time VBUS, VSYS, and battery voltage conditions without host intervention.
It integrates an IMVP8-compliant PROCHOT generator, dual current-sense amplifiers (IADPT for adapter, IBAT for battery), and a system power monitor (PSYS) with programmable gain - all referenced to a precision internal 1.024 V bandgap and calibrated via factory-trimmed registers accessible over SMBus.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5 V to 24 V - supports USB 2.0/3.0/3.1 Type-C and USB PD adapters without external LDO or overvoltage clamping |
| Battery Cell Support | 1S–4S - configured via CELL_BATPRESZ pin; sets SYSOVP thresholds (5 V/12 V/19.5 V) and enables chemistry-agnostic charging |
| Charge Voltage Accuracy | ±0.5% - ensures tight regulation across temperature (0°C to 85°C) for Li+ and LiFePO₄ cells, minimizing overcharge risk |
| Input Current Regulation | ±2% - maintains stable adapter sourcing under varying line impedance using ACP/ACN differential sensing |
| Switching Frequency | 800 kHz or 1.2 MHz - selectable via register; supports compact 1 µH–3.3 µH inductors and reduces EMI filtering burden |
| PROCHOT Compliance | IMVP8-compliant - asserts active-low open-drain signal directly to CPU upon adapter overload, battery discharge surge, or VSYS droop |
| OTG Output Range | 4.48 V to 20.8 V - generates USB PD-compatible VBUS from battery during host power loss, with up to 6.35 A current limit |
Pinout & Package
Package: 32-pin 4 mm × 4 mm WQFN (RSN) with exposed thermal pad soldered to PCB ground plane for thermal management (RθJB = 7.8 °C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VBUS (Pin 1) | Primary input power rail | Accepts 3.5–24 V adapter input; feeds REGN LDO and powers gate drivers; requires 1 Ω + 0.47 µF low-pass filter |
| VSYS (Pin 22) | System voltage sense & regulation node | Directly monitors and regulates system bus; enables instant-on operation even with dead battery via NVDC architecture |
| BATDRV (Pin 21) | BATFET gate driver output | Drives external P-channel FET; pulls to VSYS to disable BATFET, goes 10 V below VSYS to fully enhance it for linear regulation |
| SRP/SRN (Pins 20/19) | Battery current sense inputs | Differential pair for charge/discharge current measurement; matched leakage (<±12 µA) ensures <±5% current monitor accuracy |
| ACP/ACN (Pins 3/2) | Adapter current sense inputs | Differential pair for input current regulation; matched leakage (<±16 µA) enables accurate IDPM control under source-limited conditions |
| PROCHOT (Pin 11) | Processor thermal throttle signal | Open-drain output asserted low when IADPT, IBAT, or VSYS breaches IMVP8-defined thresholds; configurable pulse width (REG0x33[5:2]) |
| SCL/SDA (Pins 13/12) | SMBus interface | Two-wire host communication port for real-time register access, fault reporting, and dynamic configuration of charge profiles and protection limits |
Key Features
| Feature | Design Value |
|---|---|
| Narrow-VDC (NVDC) Power Path | Regulates VSYS at battery voltage but never below programmable minimum (6.144–12.288 V); sustains system operation during deep battery depletion or removal |
| Seamless Buck-Boost Transition | Autonomously switches operating mode without host command or output glitch - critical for uninterrupted CPU operation during input voltage sag or surge |
| Integrated ADC Monitoring | Simultaneously measures VBUS, VSYS, VBAT, IADPT, IBAT, and PSYS with 12-bit resolution and factory-calibrated offsets/gains for system-level power budgeting |
| USB On-The-Go (OTG) | Converts battery energy into regulated 4.48–20.8 V VBUS output with hardware-enforced current limiting up to 6.35 A - eliminates need for separate boost IC in portable power banks |
| Input Current Optimizer (ICO) | Maximizes power extraction from weak sources (e.g., legacy USB ports) by dynamically adjusting input current limit to maintain VBUS above VDPM threshold |
Applications
| Ultra-Book Power Management | Industrial Tablet Battery System |
|---|---|
Use Scenario: Dual-input (USB-C PD + barrel jack) notebook with 3-cell Li-ion battery and Intel Core processor requiring instant-on, thermal throttling, and adapter/battery priority arbitration. IC Role / Device Role / Timing Role: Primary buck-boost charge controller and system power arbiter; manages VSYS regulation, PROCHOT signaling, and seamless input source handover. Use Value: Enables <100 ms wake-from-suspend with dead battery, prevents CPU thermal shutdown during sustained 25 W load, and extends runtime via adaptive NVDC supplement mode. |
Use Scenario: Ruggedized medical tablet operating in field environments with variable input sources (car adapter, solar charger, USB PD) and 4-cell LiFePO₄ battery for wide-temp reliability. IC Role / Device Role / Timing Role: Multi-chemistry charge manager with input voltage/current regulation (VDPM/IDPM) and battery health-aware charging profile selection. Use Value: Maintains safe charging at –20°C to 60°C, rejects noisy automotive transients via robust ACP/ACN sensing, and reports real-time PSYS to cloud-based battery analytics. |
| Detachable 2-in-1 Tablet | USB-PD Power Bank |
Use Scenario: Detachable Windows tablet with keyboard dock; requires battery charging while docked, OTG power delivery to peripherals when undocked, and unified thermal management across both modes. IC Role / Device Role / Timing Role: Central power controller handling bidirectional energy flow - charges battery from dock, powers tablet from battery, and throttles CPU via PROCHOT during high-power docking events. Use Value: Eliminates separate OTG boost converter and thermal sensor IC; reduces BOM count by 3 components and enables single-firmware thermal policy across docked/undocked states. |
Use Scenario: High-capacity 20,000 mAh power bank supporting USB PD 3.0 input (up to 100 W) and programmable output (5–20 V @ 5 A) to charge laptops and phones. IC Role / Device Role / Timing Role: Core buck-boost charge controller and VBUS generator; manages high-efficiency charging from variable PD sources and precise OTG voltage/current regulation. Use Value: Achieves >92% peak efficiency across 5–20 V OTG range, supports 6.35 A max output with ±2% current accuracy, and enables firmware-updatable charge profiles via SMBus. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-chemistry buck-boost charging applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ25710RSNT | Pin-to-pin compatible successor with enhanced USB PD 3.0 compliance, lower quiescent current (15 µA vs. 25 µA), and added I²C address flexibility | Required for new designs targeting USB PD 3.0 PPS certification; retains identical NVDC behavior and register map compatibility | Select BQ25710RSNT for new USB PD 3.0 designs; BQ25700ARSNT remains valid for cost-sensitive legacy platforms with USB PD 2.0 support |
| MP2731GQ-Z | Monolithic 2.5 A solution with integrated MOSFETs; lacks PROCHOT generation, PSYS monitor, and OTG voltage programmability beyond 5 V/9 V/12 V/15 V/20 V fixed profiles | Suitable for compact portable devices where full IMVP8 throttling and continuous OTG voltage tuning are not required | Choose MP2731GQ-Z only when board space is constrained and system-level thermal management is handled externally |
Compared with BQ25700ARSNT, BQ25710RSNT offers backward-compatible enhancements for next-gen USB PD compliance, while MP2731GQ-Z trades system-level monitoring capability for integration density - making BQ25700ARSNT the optimal choice for designs demanding full PROCHOT, PSYS, and analog-programmable OTG voltage control.
Availability
BQ25700ARSNT is available at Aetrix Electronics and suitable for ultra-books, industrial tablets, and USB PD power banks requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing for production ramp.
Supply support for BQ25700ARSNT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management ICs, with decades of expertise in battery charging and system power architecture.
The BQ25700ARSNT belongs to TI's bqSwitcher™ family of highly integrated battery management ICs, designed specifically for space-constrained, high-efficiency computing and portable power applications requiring multi-source input flexibility and intelligent thermal/power coordination.
FAQ
What is the maximum supported battery cell count for BQ25700ARSNT?
The BQ25700ARSNT supports 1-cell to 4-cell battery configurations, selected via the CELL_BATPRESZ pin. This pin also configures system overvoltage protection thresholds: 5 V for 1S, 12 V for 2S, and 19.5 V for 3S/4S. The device automatically adapts charge voltage and current limits based on the detected cell count, enabling single-design reuse across multiple battery pack variants without firmware changes. BQ25700ARSNT maintains ±0.5% charge voltage accuracy across all configurations.
Does BQ25700ARSNT support USB On-The-Go (OTG) functionality?
Yes, BQ25700ARSNT supports USB OTG by generating a programmable 4.48 V to 20.8 V output on VBUS from the battery, with current limiting up to 6.35 A. OTG mode is enabled via the EN_OTG pin and SMBus register REG0x32[13]. During OTG operation, the device regulates both output voltage and current using its integrated buck-boost power stage and current-sense amplifiers. BQ25700ARSNT does not require external boost circuitry, reducing solution size and cost in portable power bank and detachable tablet applications.
How does BQ25700ARSNT implement Narrow-VDC (NVDC) power path management?
BQ25700ARSNT implements NVDC by regulating VSYS at battery voltage while enforcing a programmable minimum system voltage (6.144 V to 12.288 V). When battery voltage drops below this threshold, the BATFET enters linear mode - driven by BATDRV - to maintain VSYS regulation without collapsing. This allows instant-on operation even with a deeply discharged or absent battery. BQ25700ARSNT sustains system load during adapter overload by seamlessly transitioning the battery into supplement mode, preventing brownouts during peak CPU activity.
What interfaces does BQ25700ARSNT use for host communication and configuration?
BQ25700ARSNT uses a standard SMBus 2.0 interface (SCL/SDA pins) for full register-level host control, including charge voltage/current, system voltage limits, PROCHOT behavior, and OTG parameters. It also provides hardware-based configuration options: ILIM_HIZ pin for analog input current limiting and CELL_BATPRESZ for battery cell count selection. BQ25700ARSNT does not support I²C or SPI; SMBus is the sole digital interface, ensuring compatibility with Intel EC and embedded controllers in notebook platforms.
What safety protections are built into BQ25700ARSNT?
BQ25700ARSNT integrates comprehensive safety features: input overvoltage (up to 30 V absolute max), system overvoltage (programmable up to 19.5 V), battery overvoltage, thermal shutdown (155°C junction), MOSFET/inductor overcurrent protection, and reverse-battery plug-in protection via 10 Ω series resistors on SRP/SRN. All protections trigger automatic fault response - such as disabling charging, asserting CHRG_OK LOW, and latching or auto-recovering based on register settings. BQ25700ARSNT reports fault status via SMBus registers and dedicated pins like CHRG_OK and PROCHOT.
BQ25700ARSNT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 32-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Battery Monitor
- Battery Chemistry:
- Multi-Chemistry
- Number of Cells:
- 1 ~ 4
- Fault Protection:
- Over Current, Over Temperature, Over Voltage
- Interface:
- I2C
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-QFN (4x4)
BQ25700ARSNT FAQ
1.How can I place an order for BQ25700ARSNT through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ25700ARSNT on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for BQ25700ARSNT reliable?
The price and inventory of BQ25700ARSNT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ25700ARSNT is usually 5 days.
3.What payment methods are accepted for BQ25700ARSNT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ25700ARSNT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ25700ARSNT?
BQ25700ARSNT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ25700ARSNT order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for BQ25700ARSNT?
For technical support, including BQ25700ARSNT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ25700ARSNT requirements.
6.How does Aetrix verify that BQ25700ARSNT is sourced from the original manufacturer or authorized distributors?
All BQ25700ARSNT products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that BQ25700ARSNT meets industry standards.
7.What is the process for return or replacement of BQ25700ARSNT?
All BQ25700ARSNT units undergo pre-shipment inspection (PSI). If there is an issue with BQ25700ARSNT, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The BQ25700ARSNT part is unused and in its original packaging.
Return procedure for BQ25700ARSNT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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