Texas Instruments BQ76925RGET

Overview

BQ76925RGET from Texas Instruments is a host-controlled analog front end (AFE) for 3- to 6-series Li-ion and Li-phosphate battery packs, providing cell voltage monitoring (up to 6 cells), bidirectional current sensing via external shunt, thermistor bias control, overcurrent detection with programmable threshold (25–400 mV), and integrated 50 mA per-cell balancing FETs. It operates from 4.2 V to 26.4 V and delivers 3.3 V regulated output for microcontroller power.

For engineers reviewing the BQ76925RGET datasheet, BQ76925RGET pinout, BQ76925RGET application, or BQ76925RGET equivalent, this device serves as a precision analog interface in safety-critical battery management systems where host-based fault decision logic, low quiescent current (1.5 µA sleep), and calibrated reference accuracy (±0.1% post-correction) are essential selection criteria.

Technical Context

The BQ76925RGET implements a multiplexed, level-shifted analog signal chain: six differential cell inputs (VC0–VC6) feed a scalable amplifier (gain 0.3/0.6) with ±3 mV post-correction accuracy at 25°C; current sense uses dual-gain (4×/8×) amplification of SENSEP–SENSEN differential voltage; and temperature sensing relies on switchable VTB bias (1 mA, 90–130 Ω internal RDS(ON)) driving external NTC networks.

Its I²C interface supports optional packet CRC and wake-up via ALERT pin (0.8–2 V threshold); power management includes four operational modes (NORMAL/STANDBY1/STANDBY2/SLEEP) with supply currents ranging from 40 µA to 1.5 µA; the internal 3.3-V regulator delivers up to 4 mA with ±3% output tolerance (3.2–3.4 V) and supports back-feeding.

Key Specifications

Pinout & Package

Package: 24-pin VQFN (RGE), 6.50 mm × 4.40 mm, exposed thermal pad - optimized for thermal dissipation in compact battery pack PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BQ76925RGET, the BQ76920RGER omits 6-cell support and regulation, increasing BOM count; the BQ7693000RGER adds autonomous functions but raises sleep current and complexity - BQ76925RGET remains optimal for host-controlled, low-power, 6S AFE designs requiring minimal external components.

Availability

BQ76925RGET is available at Aetrix Electronics and suitable for cordless power tools, light electric vehicles, and UPS systems requiring stable component supply across multi-year production cycles and qualification-limited revisions.

Supply support for BQ76925RGET 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 battery management system expertise.

The BQ76925RGET belongs to TI's high-precision battery monitor AFE product line, designed specifically for host-controlled, low-quiescent-current battery packs in industrial, medical, and mobility applications where measurement accuracy and design flexibility are critical.

FAQ

What is the primary function of the BQ76925RGET in a battery management system?

The BQ76925RGET serves as a host-controlled analog front end that conditions and scales cell voltage (VC0–VC6), pack current (via SENSEP/SENSEN), and temperature (via VTB) signals for external ADC sampling. It does not perform autonomous protection - all decisions are made by the host MCU using calibrated data from BQ76925RGET outputs like VCOUT, VIOUT, and VREF.

Does the BQ76925RGET support 6-series lithium-ion battery configurations?

Yes, the BQ76925RGET explicitly supports 3- to 6-series Li-ion and Li-phosphate battery stacks. Its seven cell-sense inputs (VC0 through VC6) allow direct connection to the negative terminal (VC0), each cell junction, and the positive terminal (VC6) of a 6-cell series stack without external level-shifting components.

How does the BQ76925RGET achieve high-accuracy voltage measurements?

The BQ76925RGET achieves high-accuracy voltage measurements through factory-trimmed gain and offset correction factors stored in non-volatile memory. The host MCU reads these values (e.g., VREF_CAL, VREF_CAL_EXT) and applies them to raw ADC readings from VCOUT and VREF, enabling ±3 mV cell voltage accuracy at 25°C after correction - independent of host ADC linearity.

Can the BQ76925RGET operate without an external microcontroller?

No, the BQ76925RGET is not a standalone protector. It requires continuous host MCU control for cell balancing activation, overcurrent threshold configuration, thermistor bias switching, and interpretation of VCOUT/VIOUT/VREF signals. All protection decisions, timing, and balancing logic reside in the host firmware - BQ76925RGET provides only the analog interface layer.

What package options are available for the BQ76925RGET?

The BQ76925RGET is offered exclusively in the 24-pin VQFN (RGE) package measuring 6.50 mm × 4.40 mm with an exposed thermal pad. This differs from the pin-compatible BQ76925PW (TSSOP-20) variant; the RGET suffix confirms the VQFN-RGE package, which provides superior thermal performance for high-current balancing applications.