Texas Instruments BQ27425YZFR-G2B

Overview

BQ27425YZFR-G2B from Texas Instruments is a system-side single-cell Li-ion battery fuel gauge IC with integrated 10 mΩ sense resistor, Impedance Track™ algorithm, I²C interface, and on-chip LDO regulator. It resides on the host system board, supports embedded or removable batteries, and reports remaining capacity (mAh), state-of-charge (%), and voltage (mV) for portable electronics power management.

For engineers reviewing the BQ27425YZFR-G2B datasheet, BQ27425YZFR-G2B pinout, BQ27425YZFR-G2B application, or BQ27425YZFR-G2B equivalent, key selection criteria include integrated sense resistor value, I²C timing compliance (400 kHz), low-power operating modes (SLEEP: 23 µA, HIBERNATE: 8 µA), internal temperature sensing, and SOC smoothing functionality for stable UI reporting.

Technical Context

The BQ27425YZFR-G2B implements Texas Instruments' patented Impedance Track™ algorithm to compute state-of-charge by correlating cell voltage, current (via integrated 10 mΩ SRX–VSS sense path), temperature, and historical impedance profile. It uses a 14–15-bit integrating ADC for coulomb counting and a separate 14–15-bit ADC for BAT voltage and internal temperature measurement.

Its functional architecture includes an on-die 2.5-V LDO (2.4–2.6 V output), programmable GPOUT pin supporting either Battery Low warning or SOC interrupt pulses, BIN pin for battery insertion detection, and CE pin for regulator enable control. Power modes-NORMAL (118 µA), SLEEP (23 µA), HIBERNATE (8 µA), and SHUTDOWN (1 µA)-are managed automatically or via host command.

Key Specifications

Pinout & Package

Package: 15-pin DSBGA (YZF), 2.69 mm × 1.75 mm, 0.5-mm pitch, bottom-side ball layout.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar fuel gauging applications.

Compared with BQ27425YZFR-G2B, the BQ27427YZFR-G2 offers broader chemistry support but requires revalidation for LiMn₂O₄ operation, while the BQ27510-G3 increases BOM cost and layout complexity due to its external sense resistor and non-drop-in package-neither is pin-compatible nor functionally identical without firmware and hardware revision.

Availability

BQ27425YZFR-G2B is available at Aetrix Electronics and suitable for smartphones, tablets, and handheld terminals requiring stable component supply, long-term lifecycle support, and production-ready fuel gauging with integrated sensing.

Supply support for BQ27425YZFR-G2B 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 IP development.

The BQ27425YZFR-G2B belongs to TI's Impedance Track™ fuel gauge product line, designed specifically for space-constrained portable devices needing high-accuracy, low-power, system-side battery monitoring without external sense components.

FAQ

What battery chemistries does the BQ27425YZFR-G2B support?

The BQ27425YZFR-G2B is factory-configured for LiMn₂O₄ chemistry with a maximum charge voltage of 4.3–4.35 V and CHEM_ID = 0x312. It does not support LiCoO₂ or NMC without firmware reconfiguration and validation. The device uses chemistry-specific parameters in its Impedance Track™ model to ensure accurate SOC estimation across aging and temperature.

Does the BQ27425YZFR-G2B require an external sense resistor?

No, the BQ27425YZFR-G2B integrates a precision 10 mΩ sense resistor between the SRX and VSS pins, eliminating the need for an external component. This reduces PCB area, layout sensitivity, and thermal drift errors. The integrated resistor supports up to 3.5 A peak pulsed current and is factory-trimmed for accuracy.

How does the GPOUT pin function on the BQ27425YZFR-G2B?

The GPOUT pin on the BQ27425YZFR-G2B is configurable via the Operation Configuration register: when [BATLOWEN] = 1, it acts as a Battery Low indicator mirroring the [SOC1] flag; when cleared, it generates 1-ms SOC interrupt pulses at user-defined intervals (e.g., every 1% SOC change). Polarity is controlled by [GPIO_POL].

What is the purpose of the BIN pin on the BQ27425YZFR-G2B?

The BIN pin on the BQ27425YZFR-G2B detects battery insertion/removal events. When enabled ([BIE] = 1), it accepts a logic-level transition (high-to-low for insert, low-to-high for remove) or works with an external pullup/pulldown network. Detection triggers automatic transition from INITIALIZATION to NORMAL mode, enabling seamless hot-swap battery support.

What power modes does the BQ27425YZFR-G2B support and how are they entered?

The BQ27425YZFR-G2B supports four power modes: NORMAL (118 µA), SLEEP (23 µA), HIBERNATE (8 µA), and SHUTDOWN (1 µA). SLEEP and HIBERNATE activate automatically based on current thresholds and idle time; SHUTDOWN is entered by driving CE low; NORMAL resumes after CE high or I²C activity. All modes retain critical NVM data except SHUTDOWN.