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Texas Instruments BQ2019PWG4
- Part No.:
- BQ2019PWG4
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ2019PWG4.pdf
- Description:
- IC BAT MON MULT-CHEM 1-3C 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,039
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Product details
Overview
BQ2019PWG4 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 BQ2019PWG4 datasheet, BQ2019PWG4 pinout, BQ2019PWG4 application, or BQ2019PWG4 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 BQ2019PWG4 implements a voltage-to-frequency converter (VFC) architecture to digitize current-sense voltage across SR–VSS, enabling precise charge/discharge integration at 3.05 µV/LSB resolution. Its self-discharge counter dynamically scales with temperature (doubling every +10°C above 25°C), and internal 9-bit die temperature sensing feeds real-time compensation logic.
It uses flash-shadowed RAM (32 bytes) backed by 96 bytes of flash (including 32-byte shadow) and 8-byte ID ROM for nonvolatile storage of calibrated offsets, chemistry parameters, and pack identification. The HDQ interface operates at ≤5 kbit/s with break-based asynchronous framing and automatic timeout recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.8 V to 5.5 V - supports direct operation from single Li-ion or 3-cell NiMH without external regulator. |
| Active Current | <80 µA at VCC = 4.3 V - enables long-term monitoring in portable devices with minimal battery drain. |
| Sleep Current | <1.5 µA - maintains self-discharge tracking while minimizing quiescent load during idle periods. |
| Current Integration Resolution | 3.05 µV/LSB - translates to ~0.061 mV full-scale for ±100 mV input range, enabling sub-mA precision over typical sense resistors. |
| Temperature Sensing | 9-bit die temperature reporting (±3°K accuracy at 3.6 V) - used for self-discharge rate scaling and thermal compensation. |
| Memory Resources | 32 B flash-shadowed RAM + 96 B flash (64 B general-purpose + 32 B shadow) + 8 B ID ROM - stores calibrated offsets, chemistry data, and secure serialization. |
| Interface | Single-wire HDQ (≤5 kbit/s) - requires only one bidirectional line and pull-up resistor; no clock line or address decoding needed. |
Pinout & Package
Package: 8-Lead TSSOP (PW), RoHS-compliant, 3.0 mm × 4.4 mm footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| REG (Pin 1) | Regulator output | Drives external N-channel JFET to provide optional 4.75 V regulated supply; remains active in sleep mode unless DISREG bit is set. |
| VCC (Pin 2) | Supply input | Main power input (2.8–5.5 V); powers all internal circuitry including VFC, timers, and HDQ interface. |
| VSS (Pin 3) | Ground reference | Common return path for SR sense voltage, internal logic, and HDQ signal; must be low-impedance connection to battery negative. |
| HDQ (Pin 4) | Single-wire I/O | Bidirectional serial interface using break-based protocol; requires external pull-up; handles register reads/writes and command execution. |
| OSC (Pin 5) | Oscillator adjust | Programmable current source that sets internal timebase frequency via external resistor (e.g., 100 kΩ yields ±3% timer accuracy). |
| DC (Pin 6) | Internal connection | No external connection required; internally tied - must be left unconnected per datasheet. |
| SR (Pin 7) | Current-sense input | Differential input referenced to VSS; measures voltage drop across external sense resistor to compute charge/discharge flow. |
| STAT (Pin 8) | Status output | Open-drain output controlled via HDQ; used for host signaling (e.g., low-battery alert, calibration complete, or fault indication). |
Key Features
| Feature | Design Value |
|---|---|
| Integrated temperature sensor | Eliminates need for external thermistor and associated routing; enables automatic self-discharge rate scaling based on die temperature. |
| Flash-shadowed RAM | 32 bytes of volatile RAM backed by flash - preserves critical battery state (e.g., CCR/DCR values) across deep discharge or short-circuit events. |
| VFC-based current integration | Converts analog SR–VSS voltage to digital counts with 3.05 µV/LSB resolution and programmable offset calibration - avoids ADC quantization errors. |
| Low-power sleep mode | Reduces current to <1.5 µA while maintaining SCR updates and periodic wake-for-temperature sampling - extends shelf-life monitoring capability. |
| HDQ single-wire interface | Enables full register access and control using only one microcontroller GPIO with minimal external components - reduces BOM and PCB area. |
Applications
| Smartphone Battery Pack | Tablet Power Management |
|---|---|
|
Use Scenario: Real-time state-of-charge tracking and cycle-count logging in lithium-ion battery packs for consumer smartphones. IC Role / Device Role / Timing Role: Coulomb counter and temperature-aware self-discharge estimator; provides host MCU with calibrated capacity data via HDQ. Use Value: Enables accurate battery percentage display and predictive low-power warnings without requiring external sensors or high-speed interfaces. |
Use Scenario: Integrated battery health monitoring in multi-cell tablet battery modules with embedded fuel gauging. IC Role / Device Role / Timing Role: Primary gas gauge IC performing charge/discharge integration, temperature-compensated self-discharge modeling, and nonvolatile parameter storage. Use Value: Supports OEM battery authentication and warranty tracking via 8-byte ID ROM and flash-programmable chemistry parameters. |
| Medical Portable Monitor | Industrial Handheld Scanner |
|
Use Scenario: Long-duration runtime estimation in battery-powered medical devices where calibration stability and low quiescent current are critical. IC Role / Device Role / Timing Role: Low-drift coulomb counter with flash-backed RAM retention - maintains accurate capacity history even after extended storage or accidental discharge. Use Value: Ensures regulatory-compliant battery runtime reporting and eliminates recalibration requirements between clinical deployments. |
Use Scenario: Ruggedized handheld scanners requiring reliable battery telemetry under variable temperature and intermittent usage patterns. IC Role / Device Role / Timing Role: Self-contained battery monitor with integrated temperature sensor and programmable WOE thresholds - autonomously triggers sleep mode when activity falls below configurable current thresholds. Use Value: Extends operational time between charges by reducing background current to <1.5 µA during idle periods without sacrificing measurement fidelity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ2018PW | Same 8-pin TSSOP package and HDQ interface, but lacks internal temperature sensor and has only 16 bytes of flash. | Requires external thermistor for thermal compensation; unsuitable for sealed battery packs where space or reliability preclude discrete sensors. | Select BQ2018PW only if temperature monitoring is handled externally and flash storage needs are minimal. |
| BQ2023DBTR | Enhanced version with 128-byte flash, improved VFC gain stability (±0.5% vs ±1.5%), and extended –40°C to 85°C operating range. | Supports wider industrial temperature environments and longer-term data logging due to larger nonvolatile memory and tighter gain tolerance. | Choose BQ2023DBTR for new designs requiring higher accuracy, extended temp range, or future firmware extensibility. |
Compared with BQ2019PWG4, BQ2018PW offers reduced functionality and lower cost but sacrifices integrated thermal sensing and memory depth, while BQ2023DBTR delivers superior accuracy and broader environmental tolerance at the expense of higher unit cost and different packaging (SOIC-8).
Availability
BQ2019PWG4 is available at Aetrix Electronics and suitable for smartphone battery packs, medical portable monitors, industrial handheld scanners, and tablet power management systems requiring stable component supply and long-lifecycle support.
Supply support for BQ2019PWG4 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 experience in battery management solutions.
The BQ2019PWG4 belongs to TI's legacy battery fuel gauge IC family, engineered specifically for cost-sensitive, space-constrained portable applications requiring accurate coulomb counting and nonvolatile battery parameter storage without external timing or sensing components.
FAQ
What is the primary function of the BQ2019PWG4 in a battery management system?
The BQ2019PWG4 serves as a standalone coulomb counter and battery status monitor. It integrates charge and discharge current via its VFC-based sensing path, tracks elapsed time in charge/discharge cycles, compensates for self-discharge using internal temperature data, and stores calibrated parameters in flash-backed RAM. The BQ2019PWG4 communicates results to the host controller over HDQ, enabling accurate state-of-charge reporting without requiring continuous host intervention.
Does the BQ2019PWG4 require an external crystal oscillator?
No, the BQ2019PWG4 does not require an external crystal oscillator. It incorporates a high-accuracy internal timebase whose frequency is adjusted via the OSC pin using an external resistor (e.g., 100 kΩ). This eliminates the need for a crystal, reducing bill-of-materials cost and PCB area. The BQ2019PWG4 achieves ±3% timer accuracy under nominal conditions, sufficient for battery runtime estimation and self-discharge modeling.
How does the BQ2019PWG4 handle current-sense offset calibration?
The BQ2019PWG4 supports two offset calibration methods: automatic initiation via CALREQ bit or host-triggered calibrate-and-power-down command. During calibration, it measures VFC pulse timing to compute offset voltage (±500 µV max uncalibrated), stores the result in OFFCTH/OFFCTM/OFFCTL registers, and can auto-compensate using the COMPEN bit. The BQ2019PWG4 also provides TVOS bit to short SR to VSS during calibration, eliminating residual current effects from the sense path itself.
What memory resources does the BQ2019PWG4 provide for battery data storage?
The BQ2019PWG4 provides 32 bytes of flash-shadowed RAM (retained across power loss via 32-byte shadow flash), 64 bytes of general-purpose flash (organized in two 32-byte pages), and 8 bytes of factory-programmed ID ROM. This architecture allows secure serialization, chemistry-specific configuration, calibrated offset storage, and long-term battery history retention - all accessible via HDQ commands. The BQ2019PWG4 ensures data integrity even during deep discharge or temporary short-circuit events.
Can the BQ2019PWG4 operate directly from a single Li-ion cell?
Yes, the BQ2019PWG4 operates directly from a single Li-ion cell with VCC ranging from 2.8 V to 5.5 V - fully covering the typical 3.0 V to 4.2 V discharge/charge envelope. In such configurations, the REG pin is typically unused (DISREG bit enabled), and VCC connects directly to the battery positive terminal. The BQ2019PWG4's ultra-low sleep current (<1.5 µA) ensures minimal impact on standby time, making it ideal for compact, single-cell portable devices.
BQ2019PWG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- Function:
- Battery Monitor
- Battery Chemistry:
- Multi-Chemistry
- Number of Cells:
- 1 ~ 3
- Fault Protection:
- -
- Interface:
- HDQ
- Operating Temperature:
- -20°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
BQ2019PWG4 FAQ
1.How can I place an order for BQ2019PWG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ2019PWG4 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for BQ2019PWG4 reliable?
The price and inventory of BQ2019PWG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ2019PWG4 is usually 5 days.
3.What payment methods are accepted for BQ2019PWG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ2019PWG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ2019PWG4?
BQ2019PWG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ2019PWG4 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for BQ2019PWG4?
For technical support, including BQ2019PWG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ2019PWG4 requirements.
6.How does Aetrix verify that BQ2019PWG4 is sourced from the original manufacturer or authorized distributors?
All BQ2019PWG4 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that BQ2019PWG4 meets industry standards.
7.What is the process for return or replacement of BQ2019PWG4?
All BQ2019PWG4 units undergo pre-shipment inspection (PSI). If there is an issue with BQ2019PWG4, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The BQ2019PWG4 part is unused and in its original packaging.
Return procedure for BQ2019PWG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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