Texas Instruments BQ2019PWR

Overview

BQ2019PWR from Texas Instruments is a multifunction battery-monitoring IC designed for state-of-charge estimation in single-cell Li-ion or 3-cell NiMH battery packs. It performs high-accuracy coulometric current integration with offset calibration, integrates an internal temperature sensor, and eliminates need for external crystal via its high-accuracy internal timebase. It operates with <80 µA active current and supports HDQ single-wire serial interface.

For engineers reviewing the BQ2019PWR datasheet, BQ2019PWR pinout, BQ2019PWR application, or BQ2019PWR equivalent, this page delivers verified technical context, real-world use cases, pin-level design meaning, memory architecture details, and validated alternative options for battery management system integration.

Technical Context

The BQ2019PWR implements a voltage-to-frequency converter (VFC) architecture to digitize charge/discharge current sensed across an external sense resistor (SR–VSS), with 3.05 µV/LSB resolution and ±500 µV uncalibrated offset. Its internal 9-bit temperature sensor reports die temperature in °K and dynamically adjusts self-discharge counting rate-doubling per +10°C above 25°C.

It features 32 bytes of flash-backed RAM, 96 bytes of flash (including 32-byte shadow flash), and 8-byte ID ROM for nonvolatile storage of battery parameters, serial IDs, and warranty data. The HDQ interface uses asynchronous return-to-one timing with 5 kbit/s max rate, requiring precise break/recovery timing (t_B ≥ 190 µs, t_BR ≥ 40 µs) for reliable host communication.

Key Specifications

Pinout & Package

Packaged in an 8-lead TSSOP (PW) package with exposed pad (not electrically connected), the BQ2019PWR uses a compact surface-mount footprint optimized for space-constrained battery pack PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BQ2019PWR, BQ2018PWR reduces integration by removing the temperature sensor - increasing BOM and calibration effort - while BQ2022APWR extends environmental robustness and analog precision at higher cost and slightly increased supply current.

Availability

BQ2019PWR is available at Aetrix Electronics and suitable for smartphone battery packs, medical portable monitors, wireless headset power systems, and industrial handheld devices requiring stable component supply and long-lifecycle support.

Supply support for BQ2019PWR 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 energy-efficient electronics.

The BQ2019PWR belongs to TI's battery management IC portfolio, engineered specifically for high-accuracy, low-power coulomb counting in consumer and portable medical battery packs where size, thermal autonomy, and nonvolatile data retention are critical.

FAQ

What is the primary function of the BQ2019PWR in a battery system?

The BQ2019PWR serves as a standalone coulomb-counting gas gauge IC that measures charge and discharge current via an external sense resistor, integrates those measurements over time, and reports state-of-charge (SOC) to a host controller. It does not manage charging directly but provides the precise current and temperature data needed for intelligent charge termination and runtime estimation in the BQ2019PWR-based system.

Does the BQ2019PWR require an external crystal oscillator?

No, the BQ2019PWR does not require an external crystal oscillator. It incorporates a high-accuracy internal timebase adjusted via the OSC pin and an external resistor (e.g., 100 kΩ), achieving ±3% timer accuracy. This eliminates crystal cost, board space, and layout sensitivity - a key differentiator confirmed in the SLUS465E datasheet section "High-Accuracy Internal Timebase Eliminates External Crystal Oscillator."

How does the BQ2019PWR handle battery self-discharge compensation?

The BQ2019PWR uses its internal temperature sensor to dynamically scale the self-discharge count register (SCR) rate: it doubles per +10°C above 25°C and halves per –10°C below 25°C. This allows accurate long-term SOC retention modeling without host intervention. The SCR value is stored in nonvolatile flash-backed RAM, ensuring persistence across power loss - a capability explicitly documented in the "self-discharge calculation" section of SLUS465E.

Can the BQ2019PWR operate from a single Li-ion cell?

Yes, the BQ2019PWR supports direct operation from a single Li-ion cell, as its supply voltage range is 2.8 V to 5.5 V - fully covering the 3.0–4.2 V nominal and fully charged range of Li-ion. The datasheet explicitly states "Ideal for Single-Cell Li-Ion or 3-Cell NiMH Applications," and functional description confirms operation "as long as VCC is between 2.8 V and 5.5 V."

What memory resources does the BQ2019PWR provide for battery data storage?

The BQ2019PWR provides 32 bytes of flash-backed RAM, 96 bytes of flash memory (including 32 bytes of shadow flash), and 8 bytes of factory-programmed ID ROM. This architecture enables secure storage of battery identification, calibration data, cycle history, and chemistry parameters - all retained during temporary short-circuit or deep discharge events, as detailed in the "memory" section of SLUS465E.