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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Battery Management

Texas Instruments BQ76925PW

Name: BQ76925PW
Brand: Texas Instruments
SKU: BQ76925PW
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BQ76925PW

Manufacturer:: Texas Instruments

Category:: Battery Management

Package:: 20-TSSOP (0.173", 4.40mm Width)

Datasheet:: BQ76925PW.pdf

Description:: IC BAT MFUNC LI-ION 3-6C 20TSSOP

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Product details

Overview

BQ76925 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 (VC0–VC6), bidirectional current sensing via SENSEP/SENSEN inputs, and thermistor biasing via VTB. It integrates a 3.3-V LDO regulator (V3P3), I²C interface (SCL/SDA), overcurrent comparator with programmable threshold (25–400 mV), and six integrated cell-balancing FETs (50 mA max per cell). Used in cordless power tools and e-bike battery management systems.

For engineers reviewing the BQ76925 datasheet, BQ76925 pinout, BQ76925 application, or BQ76925 equivalent, this page delivers verified technical context on its role as a host-managed AFE - including calibrated reference output (VREF), cell MUX-level-shifted VCOUT/VIOUT analog outputs, thermal bias control, and low-power operation (1.5 µA sleep current) - essential for BMS architecture validation and host MCU ADC interface design.

Technical Context

The BQ76925 operates as a passive analog signal conditioner: it does not perform autonomous protection but provides precision-scaled analog outputs (VCOUT, VIOUT, VTB) for external host ADC sampling. Its cell voltage amplifier offers selectable gain (0.3 or 0.6) and factory-stored calibration coefficients applied by host firmware; current sense amplifier supports dual gain (4× or 8×) and ±125 mV to +375 mV input range.

Cell balancing is fully host-controlled via I²C register writes - no internal timing or automatic balancing logic exists. Overcurrent detection uses an internal comparator with dynamically configurable trip thresholds (25–400 mV), driving open-drain ALERT to wake the host or signal fault conditions. The 3.3-V regulator supports both direct load supply (≤4 mA) and external bypass FET configurations.

Key Specifications

Parameter	Value and Actual Design Meaning
Cell Count Support	3–6 series Li-ion/Li-phosphate cells - determines required VCn pin count and voltage scaling range
Supply Voltage Range	4.2 V to 26.4 V - covers full stack voltage of 3S (12.6 V nominal) to 6S (25.2 V nominal) packs
Normal Mode Current	40 µA typical - enables ultra-low-power host polling without compromising measurement readiness
Sleep Mode Current	1.5 µA maximum - allows extended standby during pack idle states while retaining fast wake capability
VREF Output Options	1.5 V or 3.0 V (REF_SEL bit controlled) - matches common host ADC reference ranges for optimal SNR
VCOUT Accuracy	±3 mV after host-applied gain/offset correction - enables <±0.1% cell voltage measurement error at 4.2 V
VIOUT Gain Settings	4× or 8× - supports 1-mΩ shunt with ±125 mV input for ±31.25 A or ±15.625 A full-scale current range
Cell Balancing Current	Up to 50 mA per cell - requires external R_BAL resistor; host must manage thermal dissipation and timing

Pinout & Package

Available in two RoHS-compliant packages: 20-pin TSSOP (4.0 mm × 4.0 mm) and 24-pin VQFN (6.5 mm × 4.4 mm) with exposed thermal pad. Both packages support identical pin functions and electrical specifications; VQFN offers superior thermal performance (R_θJA = 36°C/W vs. 97.5°C/W).

Pin/Terminal	Circuit Role	Design Meaning
BAT	Primary power input	Connects to most positive cell terminal; supplies internal circuitry and regulates V3P3
VC0–VC6	Cell voltage sense inputs	Differential inputs for 7-node stack (VC0 = negative end, VC6 = positive end); enable open-wire detection
SENSEP / SENSEN	Current sense differential inputs	Accept ±125 mV to +375 mV across shunt; polarity-selectable for charge/discharge direction
V3P3	3.3-V regulated output	Supplies host MCU or LEDs up to 4 mA; backfeed-capable for external supply override
VREF	Calibrated reference output	1.5 V or 3.0 V output for host ADC reference - factory-trimmed to ±4% initial tolerance
VTB	Thermistor bias output	Switchable 1 mA current source for NTC networks; host-controlled ON/OFF minimizes self-heating
VCOUT / VIOUT	Analog measurement outputs	Level-shifted, scaled cell voltage (VCOUT) and current (VIOUT) for host ADC sampling
ALERT	Open-drain fault/wakeup output	Drives low on overcurrent or host-wake event; requires external pull-up to V3P3 or host rail
SCL / SDA	I²C interface pins	Standard open-drain bus interface (≤100 kHz); optional CRC ensures robust host communication
VSS	Ground reference	System ground return for all analog and digital circuits; must be low-impedance connection

Key Features

Feature	Design Value
Factory-calibrated reference and gain/offset coefficients	Stored in non-volatile registers; host applies corrections to achieve ±3 mV cell voltage accuracy
Host-configurable overcurrent threshold	16-step selection (25–400 mV) enables precise trip points for diverse shunt resistors and current ranges
Integrated cell balancing FETs with R_DS(on) ≤ 5.5 Ω	Eliminates need for external balancing MOSFETs; host controls activation timing and duration
Switchable thermistor bias (VTB)	Reduces self-heating error in temperature measurement by enabling bias only during sampling
Low-quiescent 3.3-V regulator	Delivers stable V3P3 at 4 mA load while consuming only 40 µA in normal mode
Cell sense-line open-wire detection	Uses balancing FETs and VCn inputs to identify broken connections without additional components

Applications

Cordless Power Tools	E-Bike Battery Packs
Use Scenario: High-current, high-cycle-life battery packs requiring real-time cell voltage balancing and overcurrent fault response during motor bursts. IC Role / Device Role / Timing Role: Analog front end supplying calibrated VCOUT/VIOUT to host MCU for gas gauging, cell balancing control, and dynamic overcurrent shutdown. Use Value: Enables accurate state-of-charge estimation and per-cell balancing at 50 mA without external FETs - reducing BOM count and PCB area.	Use Scenario: UL2580-compliant e-bike packs needing redundant overcurrent detection, temperature monitoring, and low-power sleep during storage. IC Role / Device Role / Timing Role: Host-managed AFE delivering synchronized cell voltage, pack current, and NTC bias signals for safety-critical BMS firmware execution. Use Value: 1.5 µA sleep current extends shelf life; programmable OCP threshold supports 10–50 A shunts; VTB switching minimizes thermal drift in temperature readings.
Medical Portable Devices	UPS Systems
Use Scenario: Battery-powered infusion pumps and portable monitors requiring precise voltage monitoring and fail-safe shutdown under fault conditions. IC Role / Device Role / Timing Role: Safety-enabling analog signal conditioner feeding host processor with validated cell-level data for ISO 13485-compliant diagnostics. Use Value: Factory-trimmed VREF and post-correction VCOUT accuracy (<±0.1%) ensure reliable end-of-discharge detection and prevent under-voltage damage.	Use Scenario: Rack-mounted UPS units with hot-swappable 4S–6S LiFePO₄ modules requiring long-term reliability and thermal-aware balancing. IC Role / Device Role / Timing Role: Centralized AFE providing scalable cell monitoring and balancing control across multiple parallel strings via shared I²C bus. Use Value: Dual-package option (TSSOP/VQFN) supports cost-sensitive or thermally constrained designs; open-wire detection prevents false SOC reporting from sensor faults.

Cordless Power Tools

E-Bike Battery Packs

Use Scenario: High-current, high-cycle-life battery packs requiring real-time cell voltage balancing and overcurrent fault response during motor bursts.

IC Role / Device Role / Timing Role: Analog front end supplying calibrated VCOUT/VIOUT to host MCU for gas gauging, cell balancing control, and dynamic overcurrent shutdown.

Use Value: Enables accurate state-of-charge estimation and per-cell balancing at 50 mA without external FETs - reducing BOM count and PCB area.

Use Scenario: UL2580-compliant e-bike packs needing redundant overcurrent detection, temperature monitoring, and low-power sleep during storage.

IC Role / Device Role / Timing Role: Host-managed AFE delivering synchronized cell voltage, pack current, and NTC bias signals for safety-critical BMS firmware execution.

Use Value: 1.5 µA sleep current extends shelf life; programmable OCP threshold supports 10–50 A shunts; VTB switching minimizes thermal drift in temperature readings.

Medical Portable Devices

UPS Systems

Use Scenario: Battery-powered infusion pumps and portable monitors requiring precise voltage monitoring and fail-safe shutdown under fault conditions.

IC Role / Device Role / Timing Role: Safety-enabling analog signal conditioner feeding host processor with validated cell-level data for ISO 13485-compliant diagnostics.

Use Value: Factory-trimmed VREF and post-correction VCOUT accuracy (<±0.1%) ensure reliable end-of-discharge detection and prevent under-voltage damage.

Use Scenario: Rack-mounted UPS units with hot-swappable 4S–6S LiFePO₄ modules requiring long-term reliability and thermal-aware balancing.

IC Role / Device Role / Timing Role: Centralized AFE providing scalable cell monitoring and balancing control across multiple parallel strings via shared I²C bus.

Use Value: Dual-package option (TSSOP/VQFN) supports cost-sensitive or thermally constrained designs; open-wire detection prevents false SOC reporting from sensor faults.

Equivalent & Alternatives

The following parts are listed as comparable options for similar battery monitor AFE applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BQ76920	3–5 cell support only; no integrated balancing FETs; lower VBAT max (24 V); 1.5 µA sleep current same	Lacks cell balancing and open-wire detection - requires external FETs and fault logic	Select when balancing is handled externally and stack count ≤5; reduces cost where integrated FETs unnecessary
BQ76930	Supports 3–15 cells; adds autonomous protection logic; higher quiescent current (12 µA sleep); includes integrated Coulomb counter	Autonomous overvoltage/undervoltage response - reduces host MCU processing load	Select when system requires hardware-level protection triggers or >6-cell stacks; trades host control flexibility for embedded safety features

Compared with BQ76920, the BQ76925 adds integrated balancing FETs and open-wire detection for tighter BOM control; compared with BQ76930, it retains full host control and lower sleep current but requires more firmware implementation for protection decisions.

Availability

BQ76925 is available at Aetrix Electronics and suitable for cordless power tools, e-bike battery packs, and medical portable devices requiring stable component supply, long-lifecycle availability, and TI-qualified automotive-grade traceability.

Supply support for BQ76925 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 specializing in analog and embedded processing technologies, with leadership in battery management ICs and industrial-grade signal conditioning solutions.

The BQ76925 belongs to TI's host-controlled AFE product line, designed specifically for high-accuracy, low-power battery monitoring in multi-cell Li-ion/Li-phosphate systems where host MCU firmware manages all protection and balancing decisions.

FAQ

What is the primary function of the BQ76925 in a battery management system?

The BQ76925 serves as a host-controlled analog front end that conditions and scales cell voltage, pack current, and temperature signals for external ADC sampling. It does not execute autonomous protection but provides calibrated analog outputs (VCOUT, VIOUT, VTB) and reference voltage (VREF) to enable precise host-based BMS algorithms. Its core value lies in offloading high-accuracy analog signal chain design from the host MCU while maintaining full firmware control over balancing and fault response.

Does the BQ76925 support automatic cell balancing, or is it host-controlled?

The BQ76925 implements fully host-controlled cell balancing: six integrated FETs are activated only via I²C register writes from the host MCU - there is no autonomous timing, duration control, or thermal cutoff logic inside the BQ76925. Host firmware must manage balancing current limits (≤50 mA per cell), duty cycle, and thermal dissipation using stored R_DS(on) values (1–5.5 Ω) and package thermal metrics. This architecture gives designers full algorithmic flexibility but requires robust host-side implementation.

How does the BQ76925 achieve high-accuracy cell voltage measurements?

The BQ76925 achieves high-accuracy cell voltage measurements through factory-trimmed gain and offset coefficients stored in non-volatile registers (VREF_CAL, VREF_CAL_EXT), which the host MCU reads and applies to raw ADC results. Its cell voltage amplifier offers ±3 mV accuracy after correction (TA = 25°C), supported by a low-drift 1.5 V/3.0 V reference (±4% initial tolerance, ±40 ppm/°C drift) and level-shifting circuitry that handles stacked cell potentials. Host firmware must implement the correction math using coefficients retrieved via I²C.

Can the BQ76925 operate with a 1-mΩ current sense resistor, and what is the supported current range?

Yes, the BQ76925 supports operation with a 1-mΩ shunt resistor using its variable-gain current sense amplifier (gain = 4× or 8×). With 1-mΩ and 8× gain, the ±125 mV input range corresponds to ±15.625 A full-scale current; with 4× gain, it supports ±31.25 A. The device accepts inputs from –125 mV to +375 mV, enabling accurate bidirectional current measurement and high-side shunt configurations. VIOUT output range is 0.25–1.25 V (REF_SEL = 0) or 0.5–2.5 V (REF_SEL = 1).

What are the key differences between the TSSOP and VQFN packages of the BQ76925?

The BQ76925 is offered in 20-pin TSSOP (4.0 mm × 4.0 mm) and 24-pin VQFN (6.5 mm × 4.4 mm with thermal pad) packages. Both share identical pin functions and electrical specs, but the VQFN delivers significantly better thermal performance: R_θJA = 36°C/W versus 97.5°C/W for TSSOP, and R_θJB = 14°C/W versus 48.4°C/W. The VQFN's exposed thermal pad improves heat dissipation during sustained cell balancing, making it preferred for high-current or thermally constrained applications, while TSSOP suits cost-sensitive or legacy PCB layouts.

BQ76925PW Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: -

Package/Case:: 20-TSSOP (0.173", 4.40mm Width)

Packaging:: Tube

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

BQ76925PW FAQ

1.How can I place an order for BQ76925PW through Aetrix?

Please submit a Request for Quotation (RFQ) for BQ76925PW 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 BQ76925PW reliable?

The price and inventory of BQ76925PW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ76925PW is usually 5 days.

3.What payment methods are accepted for BQ76925PW?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ76925PW transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BQ76925PW?

BQ76925PW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BQ76925PW 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 BQ76925PW?

For technical support, including BQ76925PW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ76925PW requirements.

6.How does Aetrix verify that BQ76925PW is sourced from the original manufacturer or authorized distributors?

All BQ76925PW 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 BQ76925PW meets industry standards.

7.What is the process for return or replacement of BQ76925PW?

All BQ76925PW units undergo pre-shipment inspection (PSI). If there is an issue with BQ76925PW, 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 BQ76925PW part is unused and in its original packaging.

Return procedure for BQ76925PW:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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