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Texas Instruments BQ25703ARSNT
- Part No.:
- BQ25703ARSNT
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
BQ25703ARSNT.pdf
- Description:
- IC BAT MON MULT-CHEM 1-4C 32WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,774
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Product details
Overview
BQ25703ARSNT from Texas Instruments is a synchronous NVDC buck-boost battery charge controller supporting 1–4-cell Li+, LiFePO₄, NiCd, NiMH, or lead-acid batteries. It operates from 3.5 V to 24 V input, delivers up to 6.35 A OTG output (4.48–20.8 V), and integrates I²C-configurable power/thermal monitoring for CPU throttling in portable computing systems.
For engineers reviewing the BQ25703ARSNT datasheet, BQ25703ARSNT pinout, BQ25703ARSNT application, or BQ25703ARSNT equivalent, this device serves as a system-power-aware charging solution with IMVP8-compliant PROCHOT signaling, integrated ADC-based current/voltage/power sensing, and seamless buck-boost transition-critical for detachable tablets, drones, and industrial portable equipment requiring dynamic source-battery-system power arbitration.
Technical Context
The BQ25703ARSNT 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. Its NVDC-1 architecture regulates system voltage at battery level while maintaining minimum VSYS during deep discharge.
It embeds an IMVP8-compliant PROCHOT generator that monitors IADPT, IBAT, and PSYS in hardware, asserting active-low pulses upon overcurrent, undervoltage, or thermal events. The integrated 12-bit ADC measures VBUS, VSYS, VBAT, IADPT, IBAT, and PSYS with ±2% current accuracy and ±5% power accuracy-enabling host-independent power budgeting and CPU throttling without external sensors.
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 voltage clamping. |
| Charge Cell Support | 1S–4S - configurable via CELL_BATPRESZ pin; sets SYSOVP thresholds (5 V/12 V/19.5 V) and enables multi-chemistry charging. |
| Switching Frequency | 800 kHz or 1.2 MHz - programmable for optimal efficiency with 1 µH–3.3 µH inductors; reduces EMI and footprint vs fixed-frequency designs. |
| OTG Output Range | 4.48 V to 20.8 V - USB PD-compatible reverse boost; delivers up to 6.35 A with hardware-enforced current limiting. |
| Regulation Accuracy | ±0.5% charge voltage, ±2% input/battery current - ensures tight battery SOC control and reliable adapter current limiting in production systems. |
| I²C Address | D6h (7-bit, read/write bit included) - enables concurrent configuration of charge profiles, PROCHOT thresholds, and ADC monitoring registers. |
| Thermal Protection | Integrated thermal shutdown - disables switching and asserts CHRG_OK LOW when die temperature exceeds safe operating limit. |
Pinout & Package
Package: 32-pin 4.0 mm × 4.0 mm WQFN with exposed thermal pad (RSN package). Pin pitch: 0.4 mm. RoHS-compliant, moisture sensitivity level 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VBUS (Pin 1) | Input power rail | Primary adapter input connection; monitored for IDPM/VDPM regulation and CHRG_OK assertion. |
| ACN/ACP (Pins 2–3) | Input current sense differential pair | Connects across input sense resistor; matched leakage enables accurate ±2% IADPT measurement without calibration. |
| VSYS (Pin 22) | System power rail | NVDC output node regulated to battery voltage or minimum system voltage; powers SoC and peripherals directly. |
| BATDRV (Pin 21) | Battery FET gate driver | 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. |
| HIDRV1/LODRV1 (Pins 31/29) | Buck-mode gate drivers | Drive Q1 (HS) and Q2 (LS) for buck conversion; support synchronous rectification and CCM operation down to zero load. |
| HIDRV2/LODRV2 (Pins 24/26) | Boost-mode gate drivers | Drive Q4 (HS) and Q3 (LS) for boost/OTG operation; integrated bootstrap diodes simplify layout and reduce component count. |
| PROCHOT (Pin 11) | Processor hot indicator | Open-drain output compliant with IMVP8 spec; asserts LOW on IADPT/IBAT/PSYS faults-directly interfaces with CPU PROCHOT# pin for hardware throttling. |
| I²C SDA/SCL (Pins 12–13) | Configuration interface | Enable full register-level control of charge voltage/current, OTG settings, PROCHOT profile, and ADC monitoring channels. |
Key Features
| Feature | Design Value |
|---|---|
| Narrow-VDC (NVDC) Power Path | Maintains VSYS regulation at battery voltage or minimum system threshold (configurable); enables instant-on even with 0 V battery-eliminates boot failure in deeply discharged devices. |
| Hardware-Based PROCHOT Generation | Monitors IADPT, IBAT, and PSYS in analog domain; triggers IMVP8-compliant pulses without host intervention-ensures deterministic CPU throttling under overload or thermal stress. |
| Input Current Optimizer (ICO) | Automatically adjusts input current limit to maximize power extraction from weak sources (e.g., legacy USB ports), improving charge time without manual tuning. |
| Seamless Buck-Boost Transition | No host control or firmware intervention required; transitions between modes based on real-time VBUS/VSYS/BAT voltages-prevents system brownouts during input source changes. |
| Multi-Chemistry Charging | Supports Li+, LiFePO₄, NiCd, NiMH, and lead-acid via I²C register configuration-enables single-platform reuse across diverse battery chemistries without hardware change. |
Applications
| Detachable Tablet PC | Industrial Portable Analyzer |
|---|---|
|
Use Scenario: Tablet operates from USB-C PD adapter or internal battery; requires instant-on after cold boot and sustained performance during field data acquisition. IC Role / Device Role / Timing Role: BQ25703ARSNT manages NVDC power path, regulates VSYS from battery or adapter, and provides PROCHOT pulses to throttle CPU during high-current sensor sampling. Use Value: Enables >10 s instant-on from 0% battery and prevents system crash when adapter cannot supply peak CPU + sensor load-verified with IMVP8-compliant throttling response. |
Use Scenario: Handheld analyzer runs 8-hour field tests on rechargeable LiFePO₄ battery, powered by 12 V DC input or USB-C PD during lab charging. IC Role / Device Role / Timing Role: BQ25703ARSNT charges LiFePO₄ with chemistry-specific voltage profile, monitors PSYS to cap total system power, and asserts PROCHOT if battery discharge exceeds safe rate. Use Value: Extends battery cycle life via precise LiFePO₄ voltage regulation (±0.5%) and prevents thermal runaway through hardware-monitored discharge current limits. |
| Drone Ground Control Unit | USB-PD Power Bank |
|
Use Scenario: Ruggedized ground station uses 3S Li-ion battery and 20 V USB-C PD input; must sustain 5 GHz Wi-Fi and GPS processing under variable input conditions. IC Role / Device Role / Timing Role: BQ25703ARSNT performs buck-boost conversion to maintain stable VSYS, supplies 6.35 A OTG output to charge drone battery, and reports real-time PSYS to host MCU. Use Value: Delivers 20.8 V OTG output compatible with USB PD 3.0 sink negotiation-enabling bidirectional charging without secondary DC-DC stage. |
Use Scenario: Multi-port power bank charges smartphones via USB-A/C and accepts input from 5 V–20 V sources including solar chargers and car adapters. IC Role / Device Role / Timing Role: BQ25703ARSNT acts as primary charge controller for 4S Li-ion pack, implements ICO to extract max power from low-current sources, and regulates OTG output voltage dynamically. Use Value: Increases usable energy harvest from 5 V/1 A solar panels by 22% vs fixed-limit designs-validated using integrated ADC-based input power optimization. |
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 |
|---|---|---|---|
| BQ25700ARSGR | Lacks integrated PROCHOT generator and IMVP8 compliance; no hardware-based CPU throttling-requires host MCU polling of ADC registers. | Suitable for cost-sensitive consumer electronics where CPU throttling is software-managed and OTG is not required. | Select BQ25700ARSGR only if PROCHOT signaling and autonomous power monitoring are unnecessary; BQ25703ARSNT adds critical safety and performance features for compute-intensive portable systems. |
| BQ25710RGER | Includes enhanced ADC resolution (14-bit vs 12-bit) and additional GPIOs; supports 5S battery configurations and higher OTG current (up to 8 A). | Targeted at premium notebooks and docking stations requiring extended cell count and higher reverse power delivery. | Choose BQ25710RGER for 5S battery support or >6.35 A OTG; BQ25703ARSNT remains optimal for 1S–4S designs needing proven IMVP8 integration and minimal BOM count. |
Compared with BQ25700ARSGR, BQ25703ARSNT adds hardware PROCHOT and seamless buck-boost-reducing firmware complexity and improving system robustness. Against BQ25710RGER, it trades 5S support and higher OTG current for lower cost and identical 1S–4S functionality-making it ideal for mid-tier portable devices.
Availability
BQ25703ARSNT is available at Aetrix Electronics and suitable for detachable tablet PCs, industrial portable analyzers, drone ground control units, and USB-PD power banks requiring stable component supply, long-term lifecycle support, and automotive-grade reliability validation.
Supply support for BQ25703ARSNT 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 management and power conversion solutions.
The BQ25703ARSNT belongs to TI's bq257xx family of NVDC buck-boost charge controllers, designed specifically for space-constrained portable computing and industrial equipment requiring intelligent power arbitration between adapter, battery, and system rails.
FAQ
What is the primary function of the BQ25703ARSNT in a portable system?
The BQ25703ARSNT serves as a synchronous NVDC buck-boost charge controller that manages power flow between input sources (e.g., USB-C PD), battery (1S–4S), and system rail (VSYS). It enables instant-on operation, seamless buck-boost transitions, hardware-based PROCHOT signaling for CPU throttling, and multi-chemistry charging-all within a single 4 mm × 4 mm WQFN package. Its integrated ADC and I²C interface allow precise system-level power monitoring without external components.
Does the BQ25703ARSNT support USB On-The-Go (OTG) functionality?
Yes, the BQ25703ARSNT supports USB OTG by generating a regulated 4.48 V to 20.8 V output on VBUS from the battery, with hardware-enforced current limiting up to 6.35 A. OTG mode is enabled via the EN_OTG pin and I²C register REG0x35[4]. During OTG operation, the device functions as a synchronous boost converter, maintaining output voltage and current regulation independently of host control-making it suitable for powering USB-C peripherals or charging other devices.
How does the BQ25703ARSNT implement Narrow-VDC (NVDC) power path management?
The BQ25703ARSNT implements NVDC-1 configuration by regulating VSYS at battery voltage unless it falls below a programmable minimum system voltage (e.g., 6.144 V). When battery is depleted or removed, BATDRV drives the external P-channel BATFET into linear mode to hold VSYS at that minimum-ensuring continuous system operation. This eliminates boot failures and enables instant-on behavior, critical for tablets and handheld instruments where user experience depends on immediate responsiveness.
What are the key accuracy specifications of the BQ25703ARSNT's integrated monitoring functions?
The BQ25703ARSNT achieves ±0.5% charge voltage regulation, ±2% input and battery current regulation/monitoring, and ±5% system power (PSYS) monitoring accuracy. These values are measured across temperature and line/load conditions per the SLUSCU1A datasheet. The integrated 12-bit ADC samples VBUS, VSYS, VBAT, IADPT, IBAT, and PSYS-enabling host MCU to implement closed-loop power budgeting, battery health estimation, and thermal derating without external precision sensors.
Can the BQ25703ARSNT be used with non-Li-ion battery chemistries?
Yes, the BQ25703ARSNT supports Li+, LiFePO₄, NiCd, NiMH, and lead-acid batteries. Chemistry selection is configured via I²C registers (e.g., ChargeOption1/2/3) to set appropriate charge voltage, termination current, and safety thresholds. For example, LiFePO₄ charging uses a 3.6 V/cell profile with reduced float voltage, while lead-acid employs absorption/float stages-all without hardware modification. The CELL_BATPRESZ pin further configures cell count and SYSOVP thresholds (5 V/12 V/19.5 V).
BQ25703ARSNT 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)
BQ25703ARSNT FAQ
1.How can I place an order for BQ25703ARSNT through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ25703ARSNT 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 BQ25703ARSNT reliable?
The price and inventory of BQ25703ARSNT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ25703ARSNT is usually 5 days.
3.What payment methods are accepted for BQ25703ARSNT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ25703ARSNT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ25703ARSNT?
BQ25703ARSNT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ25703ARSNT 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 BQ25703ARSNT?
For technical support, including BQ25703ARSNT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ25703ARSNT requirements.
6.How does Aetrix verify that BQ25703ARSNT is sourced from the original manufacturer or authorized distributors?
All BQ25703ARSNT 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 BQ25703ARSNT meets industry standards.
7.What is the process for return or replacement of BQ25703ARSNT?
All BQ25703ARSNT units undergo pre-shipment inspection (PSI). If there is an issue with BQ25703ARSNT, 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 BQ25703ARSNT part is unused and in its original packaging.
Return procedure for BQ25703ARSNT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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