Texas Instruments BQ26220PWR

Overview

BQ26220PWR from Texas Instruments is a multifunction battery monitoring IC designed for integration into rechargeable Li-ion battery packs. It provides coulometric charge/discharge current integration (3.05 µVH LSB), 11-bit battery voltage measurement (2.44 mV LSB), and internal temperature sensing (±4 K accuracy) - all operating from a single-cell supply (2.8 V to 4.5 V) in portable electronics.

For engineers reviewing the BQ26220PWR datasheet, BQ26220PWR pinout, BQ26220PWR application, or BQ26220PWR equivalent, this device supports HDQ-based host-controlled gas gauging, flash-backed RAM/flash data retention during deep discharge, and automatic VSR offset compensation - critical for accurate state-of-charge estimation in space-constrained battery management systems.

Technical Context

The BQ26220PWR implements a precision voltage-to-frequency converter (VFC) for current sensing with 88–94 Hz/V gain and ±0.5% INL, paired with an autocalibrating 11-bit ADC for battery voltage. Its internal temperature-compensated oscillator eliminates external crystals while enabling self-discharge modeling via a dedicated SCR register that doubles count rate per +10°C above 25°C.

Communication occurs over a single-wire HDQ interface (5 kbit/s max) with break-detect timing (t_B ≥ 190 µs), supporting register read/write, flash programming, and sleep/hibernate control. All nonvolatile storage - 96 bytes of flash (including 32-byte shadow RAM) and 8-byte ID ROM - retains battery identification, chemistry, and warranty data even during pack short-circuit events.

Key Specifications

Pinout & Package

Package: TSSOP-8 (PW), 3.0 mm × 4.4 mm, 0.65 mm pitch, tape-and-reel (R suffix).

Key Features

Applications

Equivalent & Alternatives

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

Compared with BQ26100PWR and BQ27220YZFT, the BQ26220PWR uniquely balances minimal footprint (TSSOP-8), flash-based data persistence, and host-managed flexibility - making it optimal for mid-tier portable devices where reliability and field-upgradable calibration matter more than cryptographic security or algorithmic autonomy.

Availability

BQ26220PWR is available at Aetrix Electronics and suitable for smartphone battery packs, PDA power modules, wearable energy storage, medical portable monitors, and industrial handheld terminals requiring stable component supply and long-term lifecycle support.

Supply support for BQ26220PWR 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 focused on analog and embedded processing technologies, serving automotive, industrial, and personal electronics markets with high-reliability, application-optimized ICs.

The BQ26220PWR belongs to TI's battery management analog front-end (AFE) product line, engineered specifically for accurate, low-power, host-coordinated gas gauging in consumer Li-ion battery packs - emphasizing integration, calibration stability, and supply resilience.

FAQ

What is the primary function of the BQ26220PWR in a battery system?

The BQ26220PWR serves as a host-coordinated battery monitor IC, performing coulomb counting via its autocalibrating VFC, measuring battery voltage with an 11-bit ADC, and reporting die temperature - all to enable accurate state-of-charge estimation in Li-ion packs. The BQ26220PWR does not execute fuel-gauge algorithms autonomously; instead, it supplies raw and calibrated data to the host controller for final SOC calculation.

Does the BQ26220PWR require an external crystal oscillator?

No, the BQ26220PWR integrates a high-accuracy internal timebase that eliminates the need for an external crystal oscillator. This internal oscillator supports all timing functions - including VFC integration, self-discharge counting, and HDQ communication timing - with sufficient stability for battery gauging applications across −20°C to 70°C. The BQ26220PWR achieves this while maintaining only 30 µA active current consumption.

How does the BQ26220PWR handle battery voltage measurement accuracy?

The BQ26220PWR uses an 11-bit ADC with 2.44 mV LSB resolution and built-in gain/offset correction. Factory-programmed calibration data (LSB correction factor and 4-bit signed offset) is stored in the 8-byte ID ROM (addresses 0x78–0x7F). The host applies these corrections to raw BATH/BATL register values to compute accurate voltage: Correct VBAT = VBAT × (2.44 + LSB correction) − offset. The BQ26220PWR specifies ±15 LSB maximum error before correction.

What memory resources does the BQ26220PWR provide for battery data storage?

The BQ26220PWR provides 32 bytes of flash-shadowed RAM (retained via RBI during VCC dropout), 64 bytes of general-purpose flash (user-programmable for chemistry, serial number, or self-discharge rates), and 8 bytes of factory-programmed ID ROM (containing device code and ADC calibration data). Flash endurance is rated at 10,000 write cycles, and data retention exceeds 5 years - ensuring reliable storage of pack identity and usage history. All memory is accessible via the HDQ interface.

Can the BQ26220PWR operate directly from a single Li-ion cell?

Yes, the BQ26220PWR operates natively from a single Li-ion cell with a supply range of 2.8 V to 4.5 V - matching typical cell voltage under load and full charge. Its 600 nA hibernate current and RBI pin allow RAM retention even when the cell voltage drops below the 1.9–2.45 V power-on reset threshold. This enables the BQ26220PWR to maintain SOC state during deep discharge or shipping, without requiring auxiliary biasing circuitry.