Texas Instruments BQ28300PW

Overview

BQ28300PW from Texas Instruments is a fully integrated gas gauge and battery protection IC for 2- or 3-series Li-ion/Li-polymer packs, featuring 16-bit integrating ADC for coulomb counting (<180 µA normal mode), SMBus v1.1 interface, and P-channel high-side FET drive in 20-pin TSSOP package - deployed in notebook PCs and portable medical instrumentation.

For engineers reviewing the BQ28300PW datasheet, BQ28300PW pinout, BQ28300PW application, or BQ28300PW equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative parts with documented functional differences, and supply support for industrial battery pack development.

Technical Context

The BQ28300PW implements dual independent ADCs: a 22-bit effective-resolution integrating delta-sigma ADC for SRP/SRN current sensing (±0.20 V input range, 250 ms conversion) and a 15-bit delta-sigma ADC with 16-channel multiplexer for cell voltage, temperature, and pack voltage monitoring. Its embedded CPU executes pre-programmed CEDV gauging with self-discharge compensation and stores user settings in single-write non-volatile memory.

Protection logic includes configurable overvoltage/undervoltage (per cell), overtemperature (charge/discharge), short-circuit (discharge <1.83 ms, charge <0.915 ms), and cell imbalance detection - all enforced via dedicated P-channel gate drivers (CHG, DSG, ZVCHG, FUSE) with 9–13.5 V output swing and sub-200 µs rise/fall times into 4700 pF load.

Key Specifications

Pinout & Package

20-pin TSSOP (PW) package, RoHS compliant, 0.65 mm pitch, body size 6.5 × 4.4 mm. Thermal resistance θ_JA = 91.7 °C/W on JEDEC High-K board.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BQ28300PW, BQ28Z610R1 adds security and processing but increases layout complexity and cost, while BQ29400 reduces functionality to basic protection only - BQ28300PW uniquely balances integrated gauging, programmable protection, and compact TSSOP packaging for mid-tier portable applications.

Availability

BQ28300PW is available at Aetrix Electronics and suitable for notebook PC battery packs, portable medical instrumentation, and industrial test equipment requiring stable component supply, long-lifecycle support, and RoHS-compliant sourcing.

Supply support for BQ28300PW 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 over 50 years of innovation in battery management systems.

The BQ28300PW belongs to TI's SBS-compliant gas gauge and protection IC product line, designed specifically for cost-optimized, space-constrained 2S/3S Li-ion battery packs in portable computing and medical devices.

FAQ

What is the primary function of the BQ28300PW in a battery pack?

The BQ28300PW serves as a fully integrated gas gauge and analog monitoring management IC for 2- or 3-series Li-ion battery packs. It performs coulomb counting via dual ADCs, executes CEDV-based state-of-charge estimation, enforces hardware-level protection (OV/UV/OT/SC), and communicates status over SMBus v1.1 - all within a single 20-pin TSSOP package. The BQ28300PW eliminates the need for separate gauging and protection ICs in mid-tier portable applications.

Does the BQ28300PW support 2-cell and 3-cell configurations?

Yes, the BQ28300PW natively supports both 2-cell and 3-cell Li-ion/Li-polymer configurations. In 2-cell mode, VC1 is shorted to VC2 per the datasheet; all three VCx pins remain active and configurable. Cell voltage measurement accuracy is ±10 mV (–10°C to 60°C), and the internal multiplexer routes each cell's voltage to the 15-bit delta-sigma ADC for synchronized monitoring. The BQ28300PW's protection thresholds and balancing control adapt automatically based on detected configuration.

How does the BQ28300PW handle power loss during operation?

The BQ28300PW uses the RBI (RAM Backup Input) pin to maintain SRAM contents during brief power interruptions. When a capacitor (typically 0.1 µF) is connected between RBI and VSS, it supplies backup current to preserve gas gauge registers - including remaining capacity and cycle count - for up to several milliseconds. This ensures state continuity across pack disconnects or brownouts. The BQ28300PW's single-write non-volatile memory retains committed user settings permanently, unaffected by power loss.

What protection features are implemented in hardware versus firmware on the BQ28300PW?

The BQ28300PW implements critical safety protections in analog hardware: overvoltage/undervoltage per cell, short-circuit detection (<1.83 ms discharge response), and overtemperature shutdown - all enforced directly by dedicated comparators and FET drivers without CPU intervention. Firmware-managed features include CEDV gauging, self-discharge compensation, and SMBus command handling. The BQ28300PW's watchdog timer and fuse drive provide hardware-enforced failsafe escalation if firmware hangs or detects unrecoverable faults.

Is an external crystal required for BQ28300PW operation?

No, the BQ28300PW integrates a fully synthesized clock generator with no external components required. Its internal clock synthesizer provides precise timing for ADC conversions, SMBus communication, and protection decision cycles across the full operating temperature range (–20°C to 85°C). This eliminates BOM cost, PCB area, and layout sensitivity associated with external crystals or RC oscillators - a key differentiator from competing gauges like the BQ28Z610R1, which requires a 32.768-kHz crystal.