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Texas Instruments BQ25756ERRVR
- Part No.:
- BQ25756ERRVR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Chargers
- Package:
- 36-VFQFN Exposed Pad
- Datasheet:
-
BQ25756ERRVR.pdf
- Description:
- BQ25756ERRVR
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
BQ25756ERRVR from Texas Instruments is a standalone/I²C-controlled, 1- to 7-cell bidirectional buck-boost battery charge controller supporting Li-ion and LiFePO₄ chemistries. It operates across 4.2 V–36 V input and up to 36 V battery voltage ranges, delivers ±0.5% charge voltage regulation, and enables USB-PD Extended Power Range (EPR) reverse-mode operation in portable power stations and robotic lawn mowers.
For engineers reviewing the BQ25756ERRVR datasheet, BQ25756ERRVR pinout, BQ25756ERRVR application, or BQ25756ERRVR equivalent, key selection criteria include bidirectional power flow capability, MPPT for solar charging, hardware-programmable current limits via ICHG/ILIM_HIZ pins, integrated 16-bit ADC, and QFN-36 package with thermal pad for high-current thermal management.
Technical Context
The BQ25756ERRVR implements a synchronous buck-boost topology with dual N-FET gate drivers (HIDRV1/LODRV1 and HIDRV2/LODRV2), enabling seamless forward (charging) and reverse (discharge) power conversion. Its loop compensation is fully integrated, eliminating external compensation components while supporting adjustable 200–600 kHz switching frequency and external clock synchronization.
In reverse mode, the device regulates VAC from 3.3 V to 36 V in 20-mV steps and enforces input current limits from 400 mA to 20 A in 50-mA steps using a 5-mΩ sense resistor. Safety features include JEITA-compliant temperature monitoring via TS pin, programmable ACUV/ACOV protection, and battery overvoltage/overcurrent shutdown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.2 V to 36 V - supports wide-range adapters, solar inputs, and industrial DC sources without external pre-regulation. |
| Battery Voltage Range | Up to 36 V - accommodates 1–7S Li-ion or 1–9S LiFePO₄ packs, enabling flexible pack architecture in cordless tools and portable power stations. |
| Charge Voltage Accuracy | ±0.5% - ensures precise cell balancing and longevity for high-value battery systems under varying temperature and load conditions. |
| Reverse Mode VAC Regulation | 3.3 V to 36 V (20-mV/step) - meets USB-PD EPR specification for high-power downstream delivery from battery to host. |
| Switching Frequency | 200 kHz to 600 kHz - allows optimization of magnetics size vs. efficiency; supports synchronization to avoid noise coupling in sensitive systems. |
| ADC Resolution | 16-bit - provides high-fidelity real-time monitoring of input/battery voltage, current, and temperature for accurate state-of-charge and safety decisions. |
| Thermal Resistance | RθJB = 9.9 °C/W - enables reliable operation at 125 °C junction temperature with proper PCB thermal vias under full-load conditions. |
Pinout & Package
Package: 36-pin VQFN (RRV), 5.0 mm × 6.0 mm, exposed thermal pad. Designed for high-current power delivery and thermal dissipation in space-constrained portable applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SCL / SDA | I²C interface | Enable host microcontroller configuration of charge profiles, safety thresholds, and operating modes without external resistors. |
| ICHG / ILIM_HIZ | Hardware current limit programming | Set max charge current (0.4–20 A) and input current (0.4–20 A) via pull-down resistors-supports standalone operation without I²C. |
| SRP / SRN | Battery current sensing | Differential inputs for 5-mΩ sense resistor; enable accurate ±3% charge current regulation and termination detection. |
| ACP / ACN | Adapter current sensing | Differential inputs for 5-mΩ sense resistor; support ±3% input current regulation and MPPT algorithm execution. |
| VAC / ACUV / ACOV | Input voltage monitoring & protection | Programmable undervoltage (1.1 V threshold) and overvoltage (1.2 V threshold) comparators ensure safe adapter connection and DPM compliance. |
| SW1 / SW2 | Buck/boost switching nodes | Connect to external inductor; support bidirectional energy transfer between input and battery with minimal external components. |
| HIDRV1 / LODRV1 / HIDRV2 / LODRV2 | N-FET gate drivers | Drive external high-side and low-side MOSFETs; BTST1/BTST2 pins supply bootstrap bias for high-side FETs. |
| TS | Temperature qualification input | Accepts NTC thermistor divider; enables JEITA-compliant charging with five temperature zones (T1–T5) and cold/overheat suspension. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional buck-boost topology | Enables both battery charging (forward) and regulated VAC output (reverse), eliminating need for separate discharge IC in USB-PD EPR designs. |
| Integrated MPPT engine | Automatically tracks maximum power point from solar panels without host processor intervention-reducing firmware complexity and BOM count. |
| Hardware-programmable limits | ICHG and ILIM_HIZ pins allow resistor-based setup of charge/input current limits-enabling robust standalone operation when I²C is unavailable. |
| USB-PD EPR compliant reverse mode | Supports 3.3–36 V VAC regulation and 400 mA–20 A current limiting with 20-mV/50-mA resolution-meets USB PD 3.1 Extended Power Range requirements. |
| 16-bit integrated ADC | Monitors VAC, VBAT, IAC, IBAT, and TS simultaneously with <1 LSB error-enables precise SoC estimation and closed-loop thermal management. |
Applications
| Cordless Power Tools | Portable Power Stations |
|---|---|
Use Scenario: High-current fast charging of 5S–7S Li-ion packs from variable-voltage DC sources (e.g., vehicle alternator or solar array). IC Role / Device Role: Primary bidirectional charge controller managing CC/CV charging, preconditioning, termination, and reverse-mode DC output. Use Value: Enables single-chip solution for both charging and high-power DC output (up to 20 A), reducing system cost and PCB area versus discrete buck + boost + protection ICs. | Use Scenario: Solar-powered off-grid energy storage with grid-tie backup and USB-PD EPR output for laptops and EV accessories. IC Role / Device Role: Core power management IC performing MPPT solar harvesting, battery charge control, and regulated 28 V/15 A reverse-mode output. Use Value: Delivers ±0.5% voltage regulation and automatic MPPT-improving solar harvest efficiency by >8% compared to fixed-voltage chargers in partial shading conditions. |
| Robotic Lawn Mowers | Solar Chargers |
Use Scenario: Autonomous recharging from docking station with dynamic input voltage (12–36 V) and strict thermal constraints. IC Role / Device Role: Smart charge controller executing JEITA temperature profiling, battery OVP/OCP, and charging safety timer with status reporting via STAT1/STAT2. Use Value: Prevents thermal runaway during rapid charging in enclosed chassis by suspending charge above 60 °C (T5 threshold) and resuming only after cooling below 35.5 °C. | Use Scenario: Portable solar charger for camping or emergency use, accepting 12–36 V PV input and delivering regulated 5–28 V output to USB-C PD devices. IC Role / Device Role: Bidirectional power manager handling solar MPPT, LiFePO₄ charging (1–9S), and reverse-mode VAC regulation with input current limiting. Use Value: Supports 1–9S LiFePO₄ chemistry-extending cycle life beyond Li-ion in deep-discharge solar applications while maintaining ±0.5% voltage accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional buck-boost battery charge controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ25756RQF | Same silicon die, 32-pin WQFN package (4×4 mm); lacks PGND pin redundancy and thermal pad area. | Lower thermal performance (RθJB = 14.2 °C/W vs. 9.9 °C/W); unsuitable for >10 A continuous reverse-mode operation. | Select BQ25756RQF only for space-constrained, lower-power (<8 A) applications where thermal headroom is available. |
| BQ25750RRVR | Wider 4.2–70 V input range; identical pinout and register map but higher absolute max ratings and different default I²C address (0x6B vs. 0x6A). | Designed for industrial/high-voltage adapters; not drop-in compatible due to different ACUV/ACOV reference thresholds and internal DPM behavior. | Choose BQ25750RRVR only when input exceeds 36 V; verify ACUV/ACOV resistor divider recalibration and firmware I²C address update. |
Compared with BQ25756RQF and BQ25750RRVR, the BQ25756ERRVR offers optimal thermal performance for high-current portable applications, guaranteed compatibility with USB-PD EPR reverse-mode timing, and validated 36 V input operation-making it the preferred choice for 36 V-class power tools and solar generators.
Availability
BQ25756ERRVR is available at Aetrix Electronics and suitable for cordless power tools, robotic lawn mowers, and portable power stations requiring stable component supply, long-term lifecycle support, and traceable sourcing for industrial production.
Supply support for BQ25756ERRVR 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 technologies, with decades of expertise in battery management ICs.
The BQ25756ERRVR belongs to TI's BQ257xx family of bidirectional buck-boost charge controllers, designed specifically for high-efficiency, multi-chemistry battery systems in portable industrial and consumer equipment demanding USB-PD EPR compliance and solar MPPT capability.
FAQ
What battery chemistries does the BQ25756ERRVR support?
The BQ25756ERRVR supports Li-ion (1–7S) and LiFePO₄ (1–9S) chemistries with dedicated charge profiles including trickle, precharge, constant-current, and constant-voltage stages. It implements JEITA-compliant temperature-based charging suspension and recovery via the TS pin, and supports programmable recharge thresholds (93–97.6% of VFB_REG) for both chemistries. The BQ25756ERRVR does not support NiMH or lead-acid chemistries.
How does the BQ25756ERRVR implement USB-PD Extended Power Range in reverse mode?
The BQ25756ERRVR regulates VAC from 3.3 V to 36 V in 20-mV steps and enforces input current limits from 400 mA to 20 A in 50-mA steps using a 5-mΩ sense resistor-meeting USB PD 3.1 EPR voltage/current resolution requirements. It uses internal loop compensation and fast transient response to maintain regulation during dynamic load changes, with status reported via PG and INT pins. The BQ25756ERRVR does not handle USB PD communication; an external PD controller is required for protocol negotiation.
Can the BQ25756ERRVR operate without an I²C host controller?
Yes, the BQ25756ERRVR supports full standalone operation using resistor-programmable pins: ICHG sets charge current, ILIM_HIZ sets input current, and FB/ACUV/ACOV set voltage thresholds. Hardware limits take precedence over I²C registers unless disabled via EN_ICHG_PIN or EN_ILIM_HIZ_PIN bits. The BQ25756ERRVR retains all safety protections-including thermal shutdown, battery OVP, and charging timer-even in standalone mode.
What is the role of the TS pin on the BQ25756ERRVR?
The TS pin on the BQ25756ERRVR accepts a voltage divider from REGN to PGND using an NTC thermistor (e.g., 103AT-2 10-kΩ) to monitor battery temperature. It enables five-zone JEITA profiling: T1 (0 °C) suspends charge above 73.25% of REGN, T2 (5–10 °C) reduces charge current, T3 (40–45 °C) lowers charge voltage, and T5 (60 °C) fully suspends charge until voltage falls below 35.5% of REGN. The BQ25756ERRVR does not support PTC or digital temperature sensors on TS.
Does the BQ25756ERRVR integrate loop compensation for the buck-boost converter?
Yes, the BQ25756ERRVR integrates full loop compensation for its synchronous buck-boost converter, eliminating the need for external compensation components. This integration enables a compact, high-density layout with simplified design-verified across 200–600 kHz switching frequencies and 1–7S battery configurations. The BQ25756ERRVR includes soft-start functionality and supports optional external clock synchronization via the FSW_SYNC pin, but does not allow manual tuning of compensation network parameters.
BQ25756ERRVR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 36-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Battery Chemistry:
- Multi-Chemistry
- Number of Cells:
- 1 ~ 7
- Current - Charging:
- Constant - Programmable
- Programmable Features:
- Current, Timer, Voltage
- Fault Protection:
- Over Current, Over Temperature, Over-Under Voltage, Short Circuit
- Charge Current - Max:
- 20A
- Battery Pack Voltage:
- 36V (Max)
- Voltage - Supply (Max):
- 36V
- Interface:
- I2C
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 36-VQFN (5x6)
BQ25756ERRVR FAQ
1.How can I place an order for BQ25756ERRVR through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ25756ERRVR 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 BQ25756ERRVR reliable?
The price and inventory of BQ25756ERRVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ25756ERRVR is usually 5 days.
3.What payment methods are accepted for BQ25756ERRVR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ25756ERRVR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ25756ERRVR?
BQ25756ERRVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ25756ERRVR 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 BQ25756ERRVR?
For technical support, including BQ25756ERRVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ25756ERRVR requirements.
6.How does Aetrix verify that BQ25756ERRVR is sourced from the original manufacturer or authorized distributors?
All BQ25756ERRVR 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 BQ25756ERRVR meets industry standards.
7.What is the process for return or replacement of BQ25756ERRVR?
All BQ25756ERRVR units undergo pre-shipment inspection (PSI). If there is an issue with BQ25756ERRVR, 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 BQ25756ERRVR part is unused and in its original packaging.
Return procedure for BQ25756ERRVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BQ25756ERRVR Tags
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Texas Instruments
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