Texas Instruments BQ26220PWRG4

Overview

BQ26220PWRG4 from Texas Instruments is a multifunction battery monitoring IC designed for integration into rechargeable Li-ion/Li-polymer battery packs. It provides coulometric charge/discharge current integration (3.05 µVH LSB), 11-bit battery voltage measurement (2.44 mV LSB), and internal die 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 BQ26220PWRG4 datasheet, BQ26220PWRG4 pinout, BQ26220PWRG4 application, or BQ26220PWRG4 equivalent, key selection criteria include HDQ single-wire interface compatibility, hibernate current (600 nA), flash-backed RAM retention during deep discharge, and integrated VFC-based current sensing without external crystal or thermistor.

Technical Context

The BQ26220PWRG4 implements an autocalibrating voltage-to-frequency converter (VFC) for high-accuracy current integration with automatic offset compensation, eliminating host calibration. Its 11-bit ADC measures battery voltage with gain/offset correction stored in ID ROM (address 0x79), enabling ±15 LSB max error after correction.

It operates across three power states: normal (30 µA), sleep (1 µA), and hibernate (600 nA), with register backup via RBI pin during VCC dropout. Communication occurs over a 5 kbps HDQ single-wire interface using asynchronous return-to-one timing, supporting register read/write, flash programming, and counter reset commands.

Key Specifications

Pinout & Package

Package: 8-lead TSSOP (PW), 3.0 mm × 4.4 mm, 0.65 mm pitch, moisture sensitivity level 2.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BQ26200PWR and BQ27220YZFT, the BQ26220PWRG4 uniquely combines factory-trimmed voltage ADC correction, 32-byte flash-shadowed RAM, and commercial-temperature TSSOP packaging - making it optimal for high-volume portable electronics where accuracy, data retention, and manufacturability are jointly prioritized.

Availability

BQ26220PWRG4 is available at Aetrix Electronics and suitable for smartphone battery packs, tablet power systems, wearable device energy management, and medical portable monitors requiring stable component supply and long-term lifecycle support.

Supply support for BQ26220PWRG4 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 leadership in battery management ICs.

The BQ26220PWRG4 belongs to TI's bq™ family of fuel gauge ICs, engineered specifically for high-accuracy, low-power, single-wire battery monitoring in space-constrained portable Li-ion applications.

FAQ

What is the primary function of the BQ26220PWRG4 in a battery pack?

The BQ26220PWRG4 serves as a standalone gas gauge IC that performs real-time coulomb counting, battery voltage measurement, and die temperature sensing - all within a single 8-pin TSSOP package. It communicates results to the host controller via HDQ interface and stores calibrated parameters in on-chip flash, enabling accurate state-of-charge reporting without external components. The BQ26220PWRG4 is designed for integration directly into Li-ion/Li-polymer battery packs.

Does the BQ26220PWRG4 require an external crystal or oscillator?

No, the BQ26220PWRG4 features a high-accuracy internal timebase that eliminates the need for an external crystal oscillator. This integrated oscillator drives the VFC, ADC, and timer functions with sufficient stability for coulomb counting and self-discharge modeling across the −20°C to 70°C operating range. The BQ26220PWRG4 achieves this while maintaining only 30 µA operating current.

How does the BQ26220PWRG4 handle battery voltage measurement accuracy?

The BQ26220PWRG4 uses an 11-bit ADC with 2.44 mV LSB step size and stores factory-trimmed gain/offset correction data in its ID ROM (address 0x79 and bits 3–7 of BATH). The host applies these corrections to raw BATL/BATH register values to achieve ≤±15 LSB total error. This calibrated approach ensures consistent voltage accuracy across production units without host calibration routines. The BQ26220PWRG4 is optimized for 2.6–4.5 V single-cell operation.

What power-saving modes does the BQ26220PWRG4 support, and how are they triggered?

The BQ26220PWRG4 supports three power states: normal (30 µA), sleep (1 µA), and hibernate (600 nA). Sleep mode is entered via HDQ command when charge/discharge activity falls below programmable WOE thresholds; hibernate activates automatically when VCC drops below 1.9–2.45 V POR. In hibernate, the BQ26220PWRG4 draws current from the RBI pin to retain RAM contents. All modes preserve flash-stored data indefinitely.

Can the BQ26220PWRG4 operate from a single Li-ion cell without additional regulation?

Yes, the BQ26220PWRG4 operates directly from a single Li-ion or Li-polymer cell across its full usable voltage range of 2.8 V to 4.5 V. Its internal circuitry is designed for unregulated battery input, including brown-out detection and hibernate entry below 1.9 V. This eliminates the need for an external LDO or DC-DC regulator in most portable applications - simplifying design and reducing bill-of-materials cost for the BQ26220PWRG4.