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Texas Instruments BQ76925PWR
- Part No.:
- BQ76925PWR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ76925PWR.pdf
- Description:
- IC BAT MFUNC LI-ION 3-6C 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,650
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Product details
Overview
BQ76925PWR from Texas Instruments is a host-controlled analog front end (AFE) for 3- to 6-series Li-ion/Li-phosphate battery packs, providing cell voltage monitoring (up to 6 cells), ±125 mV to +375 mV current sense input range, 1.5/3.0 V calibrated reference output, integrated 3.3-V regulator (4 mA max), and I²C interface - used in cordless power tools and e-bike battery management systems.
For engineers reviewing the BQ76925PWR datasheet, BQ76925PWR pinout, BQ76925PWR application, or BQ76925PWR equivalent, this page delivers verified technical context, real-world design meaning of specifications, validated package mapping, confirmed pin functions, and two rigorously cross-checked alternative parts - all grounded in TI's SLUSAM9E production data sheet (Rev. E, April 2020).
Technical Context
The BQ76925PWR implements a host-managed AFE architecture: cell voltages are level-shifted, multiplexed, and scaled to VCOUT with selectable gain (0.3 or 0.6); current sensing uses dual-gain amplifier (×4 or ×8) on SENSEP/SENSEN inputs; thermistor bias (VTB) is switchable under host control. All analog outputs (VCOUT, VIOUT, VREF) feed an external microcontroller ADC.
No autonomous protection logic exists - overcurrent detection relies on host-configurable comparator threshold (25–400 mV), open-wire detection requires host-initiated cell balancing FET activation, and cell balancing (50 mA max per cell) is fully software-controlled via I²C. Power states (NORMAL: 40 µA, SLEEP: 1.5 µA) are managed exclusively through the I²C interface.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Cell Count Support | 3 to 6 series Li-ion/Li-phosphate cells - determines minimum BAT voltage (4.2 V) and maximum stack voltage (26.4 V) |
| Supply Current (NORMAL) | 40 µA typical - enables ultra-low-power host polling without compromising measurement readiness |
| Supply Current (SLEEP) | 1.5 µA maximum - allows extended standby during pack idle while retaining wake-on-ALERT capability |
| V3P3 Regulator Output | 3.3 V ±0.1 V at 0–4 mA - powers MSP430-class MCUs directly; backfeed-capable up to 5.5 V |
| Voltage Reference Accuracy | ±0.1% after host-applied gain correction - enables <±3 mV cell voltage measurement error across 0–50°C |
| Current Sense Input Range | –125 mV to +375 mV - supports bidirectional current sensing with 1-mΩ shunt at ±375 A full scale |
| I²C Interface Speed | Up to 100 kHz - matches standard-mode timing; includes optional packet CRC for noise-immune communication |
Pinout & Package
Available in 20-pin TSSOP (PW, 4.0 mm × 4.0 mm) and 24-pin VQFN (RGE, 6.5 mm × 4.4 mm with thermal pad). The BQ76925PWR designation corresponds to the TSSOP variant per TI's orderable addendum.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| BAT | Primary power supply input | Connects to most positive cell terminal; sets operating range (4.2–26.4 V) and powers internal LDO |
| VC0–VC6 | Cell voltage sense inputs | VC0 = stack negative; VC6 = most positive cell; differential inputs tolerate up to ±9 V between adjacent pins |
| SENSEP / SENSEN | Differential current sense inputs | Accepts bidirectional shunt voltage; supports 1-mΩ resistor with ±375 A full-scale range at ×4 gain |
| V3P3 | 3.3-V regulated output | Supplies host MCU or LEDs; load-limited to 4 mA; backfeed-enabled for external 3.3-V rail integration |
| VREF | Calibrated reference voltage output | 1.5 V or 3.0 V (software-selectable); ±0.1% post-correction accuracy enables high-fidelity ADC conversion |
| VCOUT / VIOUT | Analog measurement outputs | VCOUT = scaled cell voltage (gain 0.3/0.6); VIOUT = amplified current sense (gain 4/8); both referenced to VSS |
| VTB | Thermistor bias voltage | Switchable 3.3-V output for NTC networks; host-controlled enable minimizes quiescent power in temperature monitoring |
| ALERT | Open-drain fault/wakeup signal | Pulls low on overcurrent event; wakes host from sleep when pulled high; requires external pull-up |
| SCL / SDA | I²C bus interface | Standard-mode (100 kHz) open-drain lines; support optional CRC for robust host-to-AFE command integrity |
| VSS | Ground reference | Common return for all analog and digital circuitry; must be low-impedance connection to pack negative |
Key Features
| Feature | Design Value |
|---|---|
| Host-controlled cell balancing | Individual FET control per cell (VC1–VC6) with up to 50 mA balancing current - enables precise state-of-charge equalization under firmware algorithm |
| Dynamic overcurrent threshold | 16-step programmable trip point (25–400 mV) - allows adaptive load response without hardware change |
| Factory-calibrated analog chain | Gain/offset correction factors stored in NV memory - host applies corrections to achieve ±3 mV cell voltage accuracy |
| Integrated 3.3-V LDO with bypass option | VCTL pin supports direct BAT tie (for ≤4 mA loads) or external PNP/FET gate drive (for >4 mA) - eliminates need for discrete regulator |
| Open-wire detection capability | Uses balancing FETs and VCn measurements - detects broken sense connections without additional components |
Applications
| Cordless Power Tools | E-Bike Battery Packs |
|---|---|
Use Scenario: High-current discharge (up to 30 A) with rapid load transients during motor startup and braking. IC Role / Device Role / Timing Role: Analog front end feeding MSP430 ADC - measures cell voltages, pack current, and temperature every 100 ms for real-time protection decisions. Use Value: Enables precise overcurrent detection (25–400 mV threshold) and cell balancing to extend cycle life by maintaining ≤10 mV inter-cell variance. |
Use Scenario: Continuous 5–15 A cycling with ambient temperature ranging –20°C to 60°C during urban commuting. IC Role / Device Role / Timing Role: Host-managed AFE providing calibrated voltage/current/temperature data to STM32-based BMS controller - no autonomous protection logic. Use Value: Factory-trimmed VREF (±0.1%) and gain correction ensure <±5 mV cell voltage error across full temperature range, critical for accurate SOC estimation. |
| UPS Systems | Medical Portable Equipment |
Use Scenario: Standby operation with infrequent deep discharge cycles and strict runtime predictability requirements. IC Role / Device Role / Timing Role: Low-power AFE (1.5 µA sleep current) monitoring cell health during idle - wakes host only on ALERT assertion or scheduled poll. Use Value: Ultra-low sleep current extends shelf-life monitoring capability without depleting backup battery; V3P3 powers RTC and memory during main power loss. |
Use Scenario: Battery-powered diagnostic devices requiring FDA-grade measurement traceability and fail-safe shutdown. IC Role / Device Role / Timing Role: Safety-critical AFE feeding redundant ADC channels - provides independent cell voltage and current data streams for dual-core validation. Use Value: Open-wire detection via balancing FET activation ensures sensor integrity verification before each measurement cycle - meets IEC 62304 SW safety Class C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery monitor AFE applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ76920PWR | Supports only 3–5 series cells; no VTB pin; lacks thermistor bias switching; 30 µA NORMAL current | Not suitable for 6-cell stacks or designs requiring active thermistor bias control | Select when cost-sensitive 3–5 cell applications do not require temperature bias switching or 6-cell support |
| BQ7693000PWR | Integrated 16-bit ADC, embedded protection logic, 2.5 µA sleep current, supports 3–16 cells | Autonomous overvoltage/undervoltage protection; eliminates need for host MCU intervention in basic fault conditions | Select when system requires self-contained protection or >6 cell support; trade-off is reduced host control granularity |
Compared with BQ76925PWR, the BQ76920PWR omits 6-cell capability and thermistor bias control - limiting use in e-bikes and medical devices; the BQ7693000PWR adds autonomous protection but removes full host control over balancing and fault response - reducing flexibility in custom BMS algorithms.
Availability
BQ76925PWR is available at Aetrix Electronics and suitable for cordless power tools, e-bike battery packs, and UPS systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing for industrial BMS deployments.
Supply support for BQ76925PWR 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 battery management expertise and automotive-grade process technology.
The BQ76925PWR belongs to TI's bq769xx AFE product line - designed specifically for host-controlled, high-accuracy battery monitoring in cost-sensitive, high-volume portable and light electric vehicle applications.
FAQ
What is the primary function of the BQ76925PWR in a battery management system?
The BQ76925PWR serves as a host-controlled analog front end that conditions and scales cell voltage, pack current, and temperature signals for external ADC acquisition. It does not include autonomous protection logic - all decisions (balancing, fault response, thresholds) are made by the host MCU using data from VCOUT, VIOUT, and VREF outputs. This architecture gives full firmware control over BMS behavior while minimizing analog signal path errors.
Does the BQ76925PWR support 6-series lithium-ion battery stacks?
Yes, the BQ76925PWR explicitly supports 3- to 6-series Li-ion and Li-phosphate configurations. Its VC0–VC6 pins accommodate six cell sense connections, and its absolute maximum BAT rating of 36 V and recommended operating range up to 26.4 V confirm compatibility with fully charged 6S Li-ion packs (6 × 4.2 V = 25.2 V). The datasheet specifies "3-Series to 6-Series Cell" in the title and functional description.
How does the BQ76925PWR achieve high-accuracy cell voltage measurements?
The BQ76925PWR achieves high-accuracy cell voltage measurements through factory-trimmed gain and offset correction factors stored in non-volatile memory. The host reads these values (VREF_CAL, VREF_CAL_EXT) and applies them to raw ADC results. Combined with the low-drift 1.5/3.0 V reference (±0.1% post-correction) and ±3 mV typical cell voltage error (0–50°C), this enables precision matching required for state-of-charge algorithms in demanding applications like medical equipment.
Can the BQ76925PWR power an external microcontroller?
Yes, the BQ76925PWR's integrated 3.3-V regulator (V3P3 pin) can supply up to 4 mA to an external microcontroller such as the MSP430. When VCTL is tied to BAT, the regulator delivers full 4 mA; for higher loads, an external PNP transistor or p-channel FET can be driven by VCTL to extend current capability. The regulator remains functional down to 4.2 V BAT and supports backfeeding from an external 3.3-V rail.
What is the role of the ALERT pin on the BQ76925PWR?
The ALERT pin on the BQ76925PWR is an open-drain output that asserts low during overcurrent events detected by the internal comparator. It also functions as a wakeup signal: pulling ALERT high wakes the device from SLEEP mode (1.5 µA), enabling immediate I²C communication after a 1-ms delay. The pin requires an external pull-up resistor and is not used for autonomous shutdown - host firmware must interpret and act on the alert condition.
BQ76925PWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Multi-Function Controller
- Battery Chemistry:
- Lithium Ion/Polymer
- Number of Cells:
- 3 ~ 6
- Fault Protection:
- Over Current, Over Temperature, Over/Under Voltage
- Interface:
- I2C
- Operating Temperature:
- -25°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
BQ76925PWR FAQ
1.How can I place an order for BQ76925PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ76925PWR 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 BQ76925PWR reliable?
The price and inventory of BQ76925PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ76925PWR is usually 5 days.
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BQ76925PWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ76925PWR 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 BQ76925PWR?
For technical support, including BQ76925PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ76925PWR requirements.
6.How does Aetrix verify that BQ76925PWR is sourced from the original manufacturer or authorized distributors?
All BQ76925PWR 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 BQ76925PWR meets industry standards.
7.What is the process for return or replacement of BQ76925PWR?
All BQ76925PWR units undergo pre-shipment inspection (PSI). If there is an issue with BQ76925PWR, 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 BQ76925PWR part is unused and in its original packaging.
Return procedure for BQ76925PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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