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Texas Instruments BQ25700ARSNR
- Part No.:
- BQ25700ARSNR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
BQ25700ARSNR.pdf
- Description:
- IC BAT MON MULT-CHEM 1-4C 32WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:7,612
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Product details
Overview
BQ25700ARSNR from Texas Instruments is a synchronous NVDC buck-boost battery charge controller for 1–4-cell Li+, LiFePO₄, NiCd, NiMH, or lead-acid batteries. It operates from 3.5 V to 24 V input, delivers ±0.5% charge voltage regulation, supports SMBus host control, and enables USB OTG output (4.48–20.8 V, up to 6.35 A) - used in ultra-thin notebooks and power banks requiring seamless buck/boost transition and system power monitoring.
For engineers reviewing the BQ25700ARSNR datasheet, BQ25700ARSNR pinout, BQ25700ARSNR application, or BQ25700ARSNR equivalent, key selection considerations include its dual-mode power path management (NVDC-1), integrated PROCHOT compliance for CPU throttling, real-time system power (PSYS) and adapter/battery current monitoring, and hardware-programmable input current limit via ILIM_HIZ pin.
Technical Context
The BQ25700ARSNR implements a four-switch 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 VBUS, VSYS, and battery voltage without host intervention. Its NVDC-1 architecture regulates VSYS at battery voltage while enforcing a programmable minimum system voltage (6.144 V to 12.288 V), ensuring instant-on operation even with deeply discharged or absent batteries.
It integrates an 8-bit ADC for simultaneous measurement of VBUS, VSYS, VBAT, IADPT, IBAT, and PSYS, with dedicated analog front-ends including matched SRP/SRN and ACP/ACN current-sense inputs, internal 20×/40× IADPT gain, and 8×/16× IBAT gain. PROCHOT generation is IMVP8-compliant and configurable via SMBus registers (REG0x33) for pulse width and trigger conditions.
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 pre-regulation. |
| Battery Configuration | 1S–4S - selectable via CELL_BATPRESZ pin; sets SYSOVP threshold (5 V/12 V/19.5 V) and enables multi-chemistry charging. |
| Charge Voltage Accuracy | ±0.5% - ensures precise termination for Li+ cells across temperature (0°C to 85°C), reducing overcharge risk. |
| Input Current Regulation | ±2% - maintains stable adapter sourcing under variable load via IDPM with 10-Ω sense resistor and ILIM_HIZ pin. |
| Switching Frequency | 800 kHz or 1.2 MHz - allows use of compact 1 µH to 3.3 µH inductors, optimizing board area and efficiency. |
| OTG Output Range | 4.48 V to 20.8 V - compliant with USB PD specification; supports up to 6.35 A output current for portable device powering. |
| System Power Monitor | ±5% accuracy - provides real-time PSYS output proportional to total input + battery power, enabling dynamic CPU throttling. |
Pinout & Package
Package: 32-pin 4 mm × 4 mm WQFN (RSN) with exposed thermal pad soldered to PGND for thermal dissipation (RθJA = 37.2°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 power stage; triggers CHRG_OK when ≥3.5 V. |
| VSYS (Pin 22) | System power rail sensing node | Monitors and regulates system voltage; NVDC-1 architecture maintains VSYS ≥ programmed minimum even with dead battery. |
| BATDRV (Pin 21) | Battery FET gate driver output | Drives external P-channel BATFET; pulls to VSYS to disable, goes 10 V below VSYS to fully enhance - enables linear regulation during low-battery supplement mode. |
| SRP/SRN (Pins 20/19) | Battery current sense differential pair | Measures charge/discharge current with matched leakage (±12 µA); supports 10-Ω series resistors for reverse-battery protection. |
| ACP/ACN (Pins 3/2) | Adapter current sense differential pair | Enables IDPM with matched leakage (±16 µA); connects to external sense resistor; interfaces with IADPT buffer (20×/40× gain). |
| HIDRV1/LODRV1 (Pins 31/29) | Buck-mode MOSFET gate drivers | Drive high-side (Q1) and low-side (Q2) n-channel FETs in buck configuration; BTST1 supplies bootstrap voltage. |
| HIDRV2/LODRV2 (Pins 24/26) | Boost-mode MOSFET gate drivers | Drive high-side (Q4) and low-side (Q3) n-channel FETs in boost configuration; BTST2 supplies bootstrap voltage. |
| SCL/SDA (Pins 13/12) | SMBus interface | Two-wire host communication port (100 kHz standard mode); supports register read/write for configuration, status, and fault reporting. |
| PROCHOT (Pin 11) | Processor hot indicator output | Open-drain active-low signal to CPU; asserts on overcurrent (IADPT/IBAT), undervoltage (VSYS), or overtemperature events per IMVP8 profile. |
| PSYS (Pin 10) | System power monitor output | Current-mode output proportional to total power (adapter + battery); requires external resistor-to-ground to generate voltage for ADC sampling. |
Key Features
| Feature | Design Value |
|---|---|
| Narrow-VDC (NVDC) Power Path | Enables instant-on boot with zero or deeply discharged battery by regulating VSYS independently of VBAT; prevents system crash when adapter is overloaded. |
| USB On-The-Go (OTG) | Generates regulated 4.48–20.8 V output from battery using same power stage; supports up to 6.35 A with programmable current limit - eliminates need for separate boost IC in power banks. |
| Input Current Optimizer (ICO) | Dynamically adjusts input current limit to extract maximum power from weak sources (e.g., legacy USB ports) without triggering VDPM/IDPM faults. |
| Integrated PROCHOT Generator | Hardware-based IMVP8-compliant throttling signal derived from real-time IADPT, IBAT, and VSYS monitoring - reduces software dependency and latency vs. SMBus-only solutions. |
| Multi-Chemistry Charging | Configurable charge profiles via SMBus registers for Li+, LiFePO₄, NiCd, NiMH, and lead-acid - eliminates external chemistry-select logic or firmware adaptation. |
Applications
| Ultra-Thin Notebook Power Management | USB-C Power Bank with PD Input/Output |
|---|---|
|
Use Scenario: Dual-role notebook accepting USB-C PD input while delivering regulated system power and charging 3S Li-ion battery. IC Role / Device Role / Timing Role: Primary buck-boost charge controller managing NVDC power path, adapter/battery current arbitration, and PROCHOT signaling to Intel CPU. Use Value: Enables instant-on from dead battery, prevents brownout during peak CPU load, and supports fast charging from variable-input PD sources (5 V/9 V/15 V/20 V). |
Use Scenario: Portable power bank accepting 5–20 V USB-C PD input and delivering programmable 5–20 V output to laptops or tablets. IC Role / Device Role / Timing Role: Single-chip bidirectional buck-boost controller handling both charging (input) and OTG (output) functions with shared power stage and sensing. Use Value: Reduces BOM count by eliminating separate charger and boost IC; achieves >92% efficiency across 1S–4S battery range and wide input/output voltage spans. |
| Industrial Tablet with Hot-Swappable Battery | Medical Portable Monitor with Backup Power |
|
Use Scenario: Rugged tablet operating continuously from AC adapter while supporting hot-swap of 2S LiFePO₄ battery without system interruption. IC Role / Device Role / Timing Role: NVDC controller maintaining stable VSYS during battery insertion/removal; monitors battery health via precise voltage/current measurement. Use Value: Eliminates need for backup supercapacitors or secondary regulators; ensures uninterrupted operation during field battery replacement. |
Use Scenario: Battery-backed medical monitor requiring fail-safe operation during AC loss, with precise charge termination and runtime prediction. IC Role / Device Role / Timing Role: Multi-chemistry charge manager for sealed lead-acid or LiFePO₄ backup battery; provides accurate PSYS and IBAT telemetry for battery fuel gauging. Use Value: Meets IEC 60601-1 safety requirements via ±0.5% VBAT regulation, thermal shutdown, and overvoltage protection on all rails (VBUS, VSYS, BAT). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery buck-boost charge controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ25710RSNR | Successor with enhanced USB PD 3.0 support, higher 1.5 MHz switching frequency, and improved ICO algorithm; identical pinout and register map. | Required for new designs targeting full USB PD 3.0 compliance and faster transient response; not drop-in for legacy PD 2.0 systems. | Select BQ25710RSNR for new USB PD 3.0 designs; BQ25700ARSNR remains valid for cost-sensitive PD 2.0 or non-PD applications. |
| MP2731GQZ | Monolithic 1–4S buck-boost charger with integrated MOSFETs (no external FETs required); lower quiescent current (12 µA) but no OTG output capability. | Suitable for space-constrained consumer devices where external FET count must be minimized; lacks PSYS monitor and PROCHOT generation. | Choose MP2731GQZ when board area is critical and OTG/PROCHOT are unnecessary; retain BQ25700ARSNR when system-level power telemetry and CPU throttling are mandatory. |
Compared with BQ25710RSNR, the BQ25700ARSNR offers proven USB PD 2.0 compatibility and identical layout reuse, while MP2731GQZ trades external FET flexibility and advanced telemetry for integration - making BQ25700ARSNR optimal for industrial notebooks and power banks needing robust host-controlled power path management.
Availability
BQ25700ARSNR is available at Aetrix Electronics and suitable for ultra-thin notebooks, USB-C power banks, and industrial tablets requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for BQ25700ARSNR 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 company headquartered in Dallas, Texas, designing analog and embedded processing chips for industrial, automotive, and personal electronics markets.
The BQ25700ARSNR belongs to TI's battery management IC portfolio, engineered specifically for high-efficiency, multi-source, multi-chemistry charging in space-constrained portable computing and power delivery systems.
FAQ
What is the primary function of the BQ25700ARSNR in a notebook power architecture?
The BQ25700ARSNR serves as the core synchronous buck-boost charge controller managing power flow between USB-C/legacy adapter input, 1–4S battery, and system rail (VSYS). It implements Narrow-VDC (NVDC) power path control to maintain stable system operation during battery charge/discharge, adapter transitions, and deep-discharge conditions - directly enabling instant-on behavior and seamless source arbitration in notebooks like Dell XPS or Lenovo Yoga models.
Does the BQ25700ARSNR support USB Power Delivery (PD) negotiation?
The BQ25700ARSNR does not perform USB PD protocol negotiation itself; it relies on an external PD controller (e.g., TUSB320 or FUSB302) to handle BMC communication and voltage contract establishment. However, it fully supports PD-defined voltages (5 V/9 V/15 V/20 V) and current limits via its wide 3.5–24 V input range, IDPM/VDPM regulation, and SMBus-configurable charge parameters - making it the ideal companion IC for complete USB PD notebook solutions.
How does the BQ25700ARSNR implement PROCHOT signaling for CPU thermal management?
The BQ25700ARSNR generates PROCHOT via dedicated hardware logic that monitors real-time IADPT (adapter current), IBAT (battery discharge current), and VSYS (system voltage). When any parameter exceeds its SMBus-programmed threshold - such as IADPT > 3 A or VSYS < 10.5 V - the open-drain PROCHOT pin asserts low within microseconds, directly throttling Intel CPUs compliant with IMVP8 specifications without host software intervention, ensuring deterministic thermal response.
Can the BQ25700ARSNR charge LiFePO₄ batteries, and how is chemistry selected?
Yes, the BQ25700ARSNR supports LiFePO₄, Li+, NiCd, NiMH, and lead-acid chemistries. Chemistry selection is performed via SMBus register writes to REG0x15 (charge voltage limit) and REG0x14 (charge current limit), with default values configured at power-on reset. For LiFePO₄, typical settings are REG0x15 = 0x20D0H (8.4 V for 2S) and REG0x14 = 0x1000H (4.096 A), enabling safe constant-current/constant-voltage charging without external component changes.
What is the role of the CELL_BATPRESZ pin on the BQ25700ARSNR?
The CELL_BATPRESZ pin on the BQ25700ARSNR configures battery cell count (1S–4S) and sets corresponding system overvoltage protection (SYSOVP) thresholds: 5 V for 1S, 12 V for 2S, and 19.5 V for 3S/4S. It is biased from VDDA and pulled low during battery removal to exit LEARN mode and disable charging - providing hardware-level cell detection and fault-safe battery presence validation independent of SMBus communication.
BQ25700ARSNR 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)
BQ25700ARSNR FAQ
1.How can I place an order for BQ25700ARSNR through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ25700ARSNR 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 BQ25700ARSNR reliable?
The price and inventory of BQ25700ARSNR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ25700ARSNR is usually 5 days.
3.What payment methods are accepted for BQ25700ARSNR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ25700ARSNR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ25700ARSNR?
BQ25700ARSNR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ25700ARSNR 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 BQ25700ARSNR?
For technical support, including BQ25700ARSNR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ25700ARSNR requirements.
6.How does Aetrix verify that BQ25700ARSNR is sourced from the original manufacturer or authorized distributors?
All BQ25700ARSNR 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 BQ25700ARSNR meets industry standards.
7.What is the process for return or replacement of BQ25700ARSNR?
All BQ25700ARSNR units undergo pre-shipment inspection (PSI). If there is an issue with BQ25700ARSNR, 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 BQ25700ARSNR part is unused and in its original packaging.
Return procedure for BQ25700ARSNR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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