Texas Instruments BQ34110PW

Overview

BQ34110PW from Texas Instruments is a multi-chemistry CEDV battery gas gauge IC for rarely discharged applications, providing State-of-Charge (SOC), State-of-Health (SOH), Time-to-Empty (TTE), and watt-hour–based charge termination. It supports up to 65 V battery packs, Li-Ion/LiFePO₄/PbA/NiMH/NiCd chemistries, and integrates precision coulomb counting, voltage/temperature measurement, and dual configurable ALERT outputs.

For engineers reviewing the BQ34110PW datasheet, BQ34110PW pinout, BQ34110PW application, or BQ34110PW equivalent, this page delivers verified technical context, real-world use cases, validated alternatives, and supply-chain support for UPS, telematics backup, and energy storage systems requiring long-term battery health monitoring without frequent discharge cycles.

Technical Context

The BQ34110PW implements Compensated End-of-Discharge Voltage (CEDV) gas gauging using integrated 14-bit ADCs for voltage, current (via SRP/SRN differential sensing), and temperature (internal sensor + external NTC on TS pin). Its EOS Determination function relies on infrequent ~1% capacity Learning Phases to assess degradation in standby-dominant systems.

It operates across four power modes-NORMAL, SNOOZE, SLEEP, and SHUTDOWN-with chip enable (CE) pin control of the internal 2.5-V LDO regulator. Communication occurs over a 400-kHz I²C interface (7-bit address 0x55) with dual open-drain ALERT outputs configurable as host interrupts or charger controls.

Key Specifications

Pinout & Package

Package: TSSOP-14 (PW), 5.00 mm × 4.40 mm body size, surface-mount, lead-free.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar battery gas gauge applications.

Compared with BQ34110PW, BQ34Z100-G1 offers extended voltage range and programmability at the cost of design complexity, while BQ27441-G1 sacrifices multi-cell support and EOS functionality for lower power and bill-of-materials cost in simpler applications.

Availability

BQ34110PW is available at Aetrix Electronics and suitable for UPS backup systems, telematics modules, and energy storage systems requiring stable component supply, long-term lifecycle support, and validated battery health analytics.

Supply support for BQ34110PW 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 headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and communications markets.

The BQ34110PW belongs to TI's battery fuel gauge product line, engineered specifically for high-reliability, rarely discharged battery applications-including uninterruptible power supplies, backup telemetry, and enterprise energy storage-where end-of-service prediction outweighs cycle-count accuracy.

FAQ

What is the primary function of the BQ34110PW in battery management systems?

The BQ34110PW serves as a multi-chemistry CEDV battery gas gauge IC that provides State-of-Charge (SOC), State-of-Health (SOH), Time-to-Empty (TTE), and End-of-Service (EOS) determination. Unlike conventional gauges, the BQ34110PW is uniquely optimized for rarely discharged applications-such as UPS and backup systems-using controlled Learning Phases to assess long-term degradation without requiring full discharge cycles. This makes the BQ34110PW essential for predicting battery failure before it impacts system reliability.

Does the BQ34110PW support lithium iron phosphate (LiFePO₄) batteries?

Yes, the BQ34110PW explicitly supports LiFePO₄ chemistry alongside Li-Ion, lead-acid (PbA), NiMH, and NiCd. Its CEDV algorithm is calibrated to model the flat voltage profile of LiFePO₄ cells accurately, enabling reliable SOC and SOH estimation even under partial-state-of-charge operation. The BQ34110PW achieves this without requiring per-cell characterization-making it suitable for scalable pack designs using LiFePO₄ stacks in energy storage and backup applications.

How does the BQ34110PW reduce power consumption in always-on backup systems?

The BQ34110PW minimizes power draw through multiple hardware- and firmware-controlled mechanisms: SHUTDOWN mode consumes only 0.01 µA when CE is low; SLEEP mode draws 22 µA while maintaining timing; and VEN/GPIO and LEN pins actively disable external voltage dividers to eliminate their 45-µA quiescent load. These features allow the BQ34110PW to operate continuously for years in UPS or telematics backup systems without compromising battery runtime-directly extending service intervals and reducing maintenance frequency for the BQ34110PW-based design.

Can the BQ34110PW be used with battery packs exceeding 4.5 V?

Yes, the BQ34110PW supports battery packs up to 65 V through external resistive voltage dividers controlled by the VEN/GPIO and LEN pins. The internal BAT pin accepts only 0.05–4.5 V, but the device's integrated scaling logic interprets the divided signal to reconstruct full-pack voltage. TI provides reference divider networks and layout guidance in the BQ34110PW datasheet to ensure accuracy and stability-enabling safe, accurate gauging of high-voltage multi-cell Li-Ion or PbA configurations without additional signal conditioning ICs.

What communication interface does the BQ34110PW use, and what are its timing constraints?

The BQ34110PW uses a standard-mode I²C interface operating at up to 400 kHz, with a fixed 7-bit slave address of 0x55 (0xAA write / 0xAB read). Its timing adheres to I²C specifications: minimum SCL high/low pulse width of 600 ns / 1.3 µs, rise/fall times ≤300 ns, and bus free time ≥66 µs between STOP and START. These constraints ensure robust communication with host microcontrollers-even in electrically noisy industrial environments-while maintaining compatibility with legacy I²C peripherals in systems deploying the BQ34110PW.