Texas Instruments BQ34110PWR

Overview

BQ34110PWR from Texas Instruments is a multi-chemistry CEDV battery gas gauge IC designed for rarely discharged applications such as UPS and backup systems. It delivers State-of-Charge (SOC), State-of-Health (SOH), Time-to-Empty (TTE), and watt-hour–based charge termination with support for Li-ion, LiFePO₄, lead-acid, NiMH, and NiCd chemistries; operates up to 65 V; and features dual configurable ALERT outputs and I²C communication at 400 kHz.

For engineers reviewing the BQ34110PWR datasheet, BQ34110PWR pinout, BQ34110PWR application, or BQ34110PWR equivalent, key selection considerations include its CEDV-based EOS determination for long-term standby batteries, integrated coulomb counter with ±10 µV offset, internal 2.5-V LDO regulator, 14-bit ADC resolution for voltage/temperature sensing, and SHA-1 authentication for secure battery pack identification.

Technical Context

The BQ34110PWR implements Compensated End-of-Discharge Voltage (CEDV) gas gauging using voltage, current, and temperature inputs to compute SOC and SOH without full discharge cycles. Its End-of-Service (EOS) determination relies on infrequent ~1% capacity Learning Phases to assess battery degradation in near-fully-charged systems.

It integrates two dedicated ADCs: a 14-bit integrating ADC for current sensing (±0.125 V differential input, 1 s conversion time) and a 14-bit general-purpose ADC for BAT and TS measurements (125 ms conversion, 8 MΩ input impedance on BAT when idle). Communication occurs over a 400-kHz I²C interface with fixed 7-bit address 0x55 (0xAA write / 0xAB read).

Key Specifications

Pinout & Package

Package: TSSOP-14 (PW), 5.00 mm × 4.40 mm, 0.65 mm pitch, exposed pad not present.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BQ34Z100-G1 and MAX17055, the BQ34110PWR uniquely balances ultra-low quiescent current, CEDV-based EOS determination, and integrated LDO in a 14-pin TSSOP-making it the only solution validated for decade-long deployment in rarely discharged infrastructure applications.

Availability

BQ34110PWR is available at Aetrix Electronics and suitable for UPS backup systems, telematics modules, and energy storage systems requiring stable component supply, long-lifecycle assurance, and TI-qualified production traceability.

Supply support for BQ34110PWR 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 across industrial, automotive, and communications markets since 1930.

The BQ34110PWR belongs to TI's battery management IC portfolio, engineered specifically for high-reliability, low-maintenance battery monitoring in infrastructure-grade backup and energy storage applications where infrequent discharge and long service life are defining requirements.

FAQ

What battery chemistries does the BQ34110PWR support?

The BQ34110PWR supports Li-ion, LiFePO₄, lead-acid (PbA), NiMH, and NiCd chemistries. Its CEDV algorithm is calibrated per chemistry via configuration data stored in on-chip flash. The device does not auto-detect chemistry; selection is performed during initial setup using TI's bqStudio software and requires loading the appropriate chemistry ID and parameter tables into the BQ34110PWR's data flash memory.

How does the BQ34110PWR perform End-of-Service (EOS) determination without full discharges?

The BQ34110PWR performs EOS determination through infrequent Learning Phases-controlled ~1% capacity discharges triggered by host command or timer. During each phase, it measures voltage decay characteristics and compares them against baseline models to quantify capacity loss. When degradation exceeds user-defined thresholds, it asserts ALERT1 or ALERT2. This method avoids operational disruption while maintaining accuracy over 10+ years of standby use in the BQ34110PWR.

Can the BQ34110PWR measure battery packs above 5.5 V?

Yes-the BQ34110PWR measures high-voltage packs (up to 65 V) using an external resistive divider network connected to the BAT pin. The device actively controls this network via LEN and VEN/GPIO pins to minimize power loss during idle periods. Internal scaling factors and calibration coefficients are programmed into the BQ34110PWR's flash to compensate for divider ratio errors and ensure <±15 mV measurement accuracy across temperature and voltage ranges.

What is the role of the REG25 pin on the BQ34110PWR?

The REG25 pin on the BQ34110PWR is the 2.5-V output of the integrated LDO regulator. It powers internal digital logic and serves as the pull-up voltage source for open-drain pins (SCL, SDA, ALERT1, ALERT2). A 1-µF ceramic capacitor must be placed between REG25 and VSS. Output regulation is 2.3–2.7 V over temperature and load (≤16 mA), enabling single-rail system design without external bias supplies in the BQ34110PWR implementation.

Does the BQ34110PWR support secure authentication?

Yes-the BQ34110PWR implements SHA-1/HMAC-based authentication using a 160-bit key stored in protected flash. In UNSEALED mode, the host can program new keys or update challenges via the I²C interface. The BQ34110PWR uses a scratch-pad buffer to receive challenge data and return encrypted responses, preventing unauthorized battery replacement in certified equipment. Authentication is optional and does not affect gas-gauging functionality unless explicitly enabled in configuration.

How does the BQ34110PWR minimize power consumption in backup applications?

The BQ34110PWR minimizes power consumption via four hierarchical power modes: NORMAL (133 µA), SNOOZE (53 µA), SLEEP (22 µA), and SHUTDOWN (0.01 µA). The CE pin forces SHUTDOWN independently of firmware. In SLEEP mode, the high-frequency oscillator disables while the low-frequency clock maintains timekeeping and periodic wakeups. Combined with VEN/GPIO-controlled divider disable, total system IQ can be reduced to <1 µA in optimized BQ34110PWR deployments-extending 10-year backup battery life.