Texas Instruments BQ2050HSN-A308TR

Overview

BQ2050HSN-A308TR from Texas Instruments is a lithium-ion battery fuel gauge IC that measures available capacity with ±1% full-scale accuracy, operates from 2.7V to 4.5V supply, consumes only 120µA typical operating current and supports HDQ single-wire serial interface at 5kbps for real-time battery status reporting in portable power tools.

For engineers reviewing the BQ2050HSN-A308TR datasheet, BQ2050HSN-A308TR pinout, BQ2050HSN-A308TR application, or BQ2050HSN-A308TR equivalent, this page delivers verified pin functions, LED-driven state indication, temperature- and rate-compensated capacity tracking, SR-input-based current sensing, and pack-level charge FET control - all confirmed for the narrow SOIC-16 package variant.

Technical Context

The BQ2050HSN-A308TR implements coulomb counting via differential voltage measurement across an external sense resistor (SR–VSS), applying real-time compensation for discharge rate (per Tables 3A/4A), temperature (−35°C to +85°C in 10°C steps), and self-discharge (programmable via PROG5). It integrates a 5-bit analog front-end with digital magnitude filtering (250µV threshold) and maintains register state during low-VCC operation using RBI backup input.

Its HDQ interface uses asynchronous return-to-one protocol with LSB-first transmission, supporting read/write access to 32+ registers including NAC, CACT, LMD, VSB, TMP, and FLGS1. The IC drives five LED segments directly via open-drain LCOM and SEG1–SEG5 outputs while simultaneously enabling host microcontroller communication and pack protection supervision through CFC and PSTAT pins.

Key Specifications

Pinout & Package

Package: 16-pin narrow SOIC (5.3mm × 10.2mm, 1.27mm pitch).

Key Features

Applications

Equivalent & Alternatives

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

Compared with BQ2050HSN-A308TR, BQ2057WDBTR offers superior voltage resolution but adds system complexity via SMBus dependency and external LED drivers, while MAX17043G+T reduces power consumption significantly but removes autonomous pack-level control features like CFC and direct LED drive.

Availability

BQ2050HSN-A308TR is available at Aetrix Electronics and suitable for portable power tools, medical handheld devices, consumer drones, and industrial scanners requiring stable component supply and long-term production continuity.

Supply support for BQ2050HSN-A308TR 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 90 years of innovation in precision analog ICs.

The BQ2050HSN-A308TR belongs to TI's Power Management – Battery Management IC product line, designed specifically for cost-sensitive, space-constrained Li-ion battery packs requiring autonomous fuel gauging and minimal external components.

FAQ

What is the primary function of the BQ2050HSN-A308TR?

The BQ2050HSN-A308TR is a lithium-ion battery fuel gauge IC that performs real-time coulomb counting, applies temperature- and discharge-rate compensation to derive accurate available capacity (CACT), and provides direct LED display drive plus HDQ serial interface for host communication. Its core function is autonomous, high-accuracy state-of-charge estimation without requiring host MCU intervention for basic operation.

How does the BQ2050HSN-A308TR handle battery temperature compensation?

The BQ2050HSN-A308TR integrates an internal temperature sensor that reports values in 10°C increments (−35°C to +85°C) via TMP register (02h). It applies lookup-table-based corrections to both discharge rate compensation (Tables 3A/4A) and self-discharge rate (Table 5), updating the CACT register accordingly. This ensures capacity estimates remain accurate across environmental extremes without external thermistors.

Can the BQ2050HSN-A308TR drive LEDs directly without external components?

Yes, the BQ2050HSN-A308TR directly drives up to five LED segments using its LCOM (open-drain VCC switch) and SEG1–SEG5 outputs. LCOM sources current from VCC, while each SEGx pin sinks current to ground. No external transistors or drivers are needed, though current-limiting resistors must be placed in series with each LED anode per design guidelines.

What communication interface does the BQ2050HSN-A308TR use, and what are its timing constraints?

The BQ2050HSN-A308TR uses the HDQ single-wire bidirectional interface operating at 5kbps with LSB-first, return-to-one encoding. Key timing parameters include tSTRH/B ≥ 10µs (start pulse), tDSU/B ≥ 2µs (data setup), tDH/DV ≥ 2µs (data hold), and tSSU/B ≥ 10µs (stop pulse). A BREAK condition (HDQ low ≥ 250µs) resets the interface if communication errors occur.

Does the BQ2050HSN-A308TR support battery pack protection functions?

Yes, the BQ2050HSN-A308TR provides pack-level supervision via its CFC (Charge FET Control) output and PSTAT input. CFC actively drives low to disable the charge FET when battery voltage exceeds NMCV register value or temperature falls outside 0–60°C. PSTAT monitors the protector's overvoltage status and reflects it in FLGS1 register bit 5, enabling coordinated safety response.