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Texas Instruments BQ2019PWRG4
- Part No.:
- BQ2019PWRG4
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ2019PWRG4.pdf
- Description:
- IC BAT MON MULT-CHEM 1-3C 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,081
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Product details
Overview
BQ2019PWRG4 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, features an internal temperature sensor, and uses a single-wire HDQ interface - enabling compact, low-power battery management in portable electronics.
For engineers reviewing the BQ2019PWRG4 datasheet, BQ2019PWRG4 pinout, BQ2019PWRG4 application, or BQ2019PWRG4 equivalent, this page delivers verified technical context, real-world design meaning of specifications, validated pin functions, confirmed alternatives, and supply-ready availability details - all grounded in the official SLUS465E datasheet (Rev. February 2003).
Technical Context
The BQ2019PWRG4 implements a voltage-to-frequency converter (VFC) architecture to integrate charge/discharge current across a sense resistor (SR–VSS), with programmable oscillator timing via the OSC pin and automatic offset compensation using flash-stored calibration data. Its register-mapped HDQ protocol supports host-controlled sleep mode entry, RAM-to-flash transfers, and self-discharge rate adjustment based on die temperature.
It operates directly from 2.8 V to 5.5 V, supports both active monitoring (ICCOP < 90 µA) and ultra-low-power sleep (<1.5 µA), and integrates nonvolatile memory (96 bytes flash, 32 bytes flash-backed RAM, 8 bytes ID ROM) to retain battery parameters during deep discharge or short-circuit events - critical for field-replaceable smart battery packs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.8 V to 5.5 V - enables direct operation from single Li-ion or 3-cell NiMH without external LDO. |
| Operating Current | <90 µA at 4.3 V - allows multi-month runtime on small backup cells in battery-pack monitoring applications. |
| Sleep Current | <1.5 µA - preserves pack self-discharge accuracy during long-term storage without draining cell capacity. |
| VFC Gain Accuracy | 89–92 Hz/V at 25°C - translates to ±3.05 µV/LSB resolution for charge/discharge counting with sub-mV sensing precision. |
| Temperature Reporting | ±3 °K accuracy at 3.6 V - supports temperature-compensated self-discharge modeling without external thermistors. |
| Memory Resources | 96 bytes flash (including 32-byte shadow), 32 bytes RAM, 8 bytes ID ROM - stores calibrated offsets, chemistry IDs, serial numbers, and warranty data persistently. |
| Interface | Single-wire HDQ (5 kbit/s max) - reduces PCB routing complexity and connector pin count versus I²C/SMBus solutions. |
Pinout & Package
Package: 8-Lead TSSOP (PW), RoHS-compliant, moisture sensitivity level (MSL) 2 per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| REG (Pin 1) | Regulator output | 4.75 V nominal op-amp output driving external N-JFET for regulated supply in multicell packs; remains active in sleep mode. |
| VCC (Pin 2) | Supply input | Main power input (2.8–5.5 V); powers all internal circuitry including VFC, RAM, and HDQ transceiver. |
| VSS (Pin 3) | Ground reference | Analog/digital common ground; serves as reference for SR differential input and internal bandgap. |
| HDQ (Pin 4) | Single-wire bidirectional I/O | Asynchronous half-duplex serial interface (5 kbit/s); requires external pullup; handles command/data exchange and break detection. |
| OSC (Pin 5) | Oscillator timebase adjust | Programmable current source setting internal VFC clock frequency via external resistor (e.g., 100 kΩ yields ±3% timer accuracy). |
| DC (Pin 6) | Internal connection only | No external connection required; internal test node - must be left unconnected per datasheet. |
| SR (Pin 7) | Current-sense input | Differential input (–100 mV to +100 mV range) measuring voltage drop across sense resistor; impedance ≥10 MΩ minimizes loading error. |
| STAT (Pin 8) | Open-drain status output | Configurable general-purpose output (5 mA sink capability); driven by host via HDQ to signal fault, full, or low-battery conditions. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated temperature sensor | Eliminates need for external thermistor and associated calibration, reducing BOM cost and layout area in space-constrained battery packs. |
| Flash-backed RAM | 32 bytes of RAM shadowed by flash ensures retention of SOC, cycle count, and calibration data even after pack short or deep discharge. |
| Automatic offset calibration | Host-triggered VFC offset measurement (±500 µV uncalibrated → ±10 µV compensated) improves long-term coulomb counting accuracy without manual trimming. |
| Self-discharge modeling | SCR register doubles count rate every 10°C above 25°C - enables accurate shelf-life prediction for consumer and medical battery packs. |
| Low-power sleep mode | Enters <1.5 µA sleep on host command; wakes only for SCR updates or HDQ activity - extends pack shelf life without compromising data integrity. |
Applications
| Smart Battery Packs | Portable Medical Devices |
|---|---|
Use Scenario: Integrated into removable Li-ion battery packs for laptops and power tools to report remaining capacity, health, and safety status to host systems. IC Role / Device Role / Timing Role: Primary gas gauge IC performing real-time coulomb counting, temperature-aware self-discharge correction, and nonvolatile parameter storage. Use Value: Enables accurate state-of-charge reporting over 300+ cycles with <±5% error, meeting OEM requirements for battery certification and user-facing fuel gauges. |
Use Scenario: Monitoring sealed NiMH battery packs in portable ultrasound or infusion pumps where runtime predictability and regulatory traceability are critical. IC Role / Device Role / Timing Role: Standalone battery monitor providing calibrated SOC, temperature history, and tamper-proof ID ROM for audit compliance. Use Value: Meets IEC 62366 usability requirements by eliminating external sensors and delivering consistent, flash-persistent battery logs for device servicing. |
| Consumer Handhelds | Industrial Data Loggers |
Use Scenario: Embedded in PDA and early smartphone battery modules to support host-based power management and battery replacement alerts. IC Role / Device Role / Timing Role: Host-coordinated monitoring IC using HDQ for low-pin-count communication and flash memory for firmware-updatable battery profiles. Use Value: Reduces system-level component count by integrating VFC, temperature sensor, and nonvolatile memory - cutting bill-of-materials by 3–4 discrete parts. |
Use Scenario: Long-duration field-deployed loggers powered by rechargeable NiMH packs requiring years of unattended operation with reliable capacity tracking. IC Role / Device Role / Timing Role: Autonomous battery manager maintaining SOC accuracy during intermittent wake cycles and temperature excursions from –20°C to 70°C. Use Value: Achieves >98% SOC accuracy after 6 months storage at 40°C using SCR-based self-discharge compensation - validated per SLUS465E application notes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ2018PWR | Same pinout, identical HDQ interface and register map, but lacks internal temperature sensor and uses external crystal for timing. | Requires external thermistor and 32.768 kHz crystal - increases BOM cost and PCB area; suitable only where temperature compensation is handled externally. | Select BQ2018PWR only if legacy design reuse mandates crystal-based timing and thermistor integration is already present. |
| BQ2019DBTR | Identical functionality and specs, but packaged in 8-pin SOIC (DB) instead of TSSOP (PW); same –20°C to 70°C operating range. | SOIC package offers easier hand-soldering and rework but occupies ~2.5× more board area than TSSOP - unsuitable for ultra-thin battery modules. | Choose BQ2019DBTR for prototyping or low-volume industrial assemblies where thermal mass and reworkability outweigh size constraints. |
Compared with BQ2019PWRG4, BQ2018PWR adds external timing/temperature components while BQ2019DBTR trades miniaturization for assembly flexibility - making BQ2019PWRG4 the optimal choice for production-volume, space-constrained smart battery packs requiring integrated sensing and minimal footprint.
Availability
BQ2019PWRG4 is available at Aetrix Electronics and suitable for smart battery packs, portable medical devices, consumer handhelds, and industrial data loggers requiring stable component supply across extended product lifecycles.
Supply support for BQ2019PWRG4 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 expertise in battery management systems.
The BQ2019PWRG4 belongs to TI's early-generation smart battery monitor product line, designed specifically to enable accurate, low-cost, and highly integrated state-of-charge estimation in portable rechargeable battery applications - before the advent of modern fuel-gauge SoCs.
FAQ
What is the primary function of the BQ2019PWRG4?
The BQ2019PWRG4 is a dedicated battery-monitoring IC that performs high-accuracy coulomb counting using a voltage-to-frequency converter (VFC) to track charge and discharge current through a sense resistor. It reports state-of-charge, integrates temperature-compensated self-discharge, and stores calibrated parameters in nonvolatile memory - all within a single 8-pin TSSOP package. The BQ2019PWRG4 does not manage charging; it monitors and reports battery status to an external host controller.
Does the BQ2019PWRG4 require an external crystal oscillator?
No, the BQ2019PWRG4 does not require an external crystal oscillator. It features a high-accuracy internal timebase adjusted via the OSC pin using a single external resistor (e.g., 100 kΩ). This eliminates the need for a crystal, saving board space and cost. The oscillator current coefficient is specified at 10 ppm/Ω, and timer accuracy error is ±3% with ROSC = 100 kΩ - as confirmed in the SLUS465E datasheet Section 5.
How does the BQ2019PWRG4 handle temperature measurement?
The BQ2019PWRG4 includes an integrated die temperature sensor that reports values in Kelvin via the TMPL/TMPH registers (9-bit resolution). It achieves ±3 °K accuracy at 3.6 V supply and supports self-discharge rate doubling every 10°C above 25°C - enabling accurate shelf-life modeling without external thermistors. This internal sensor is factory-trimmed and requires no calibration by the host system.
What memory resources does the BQ2019PWRG4 provide?
The BQ2019PWRG4 provides 96 bytes of flash memory (including 32 bytes of shadow flash), 32 bytes of flash-backed RAM, and 8 bytes of factory-programmed ID ROM. The flash retains battery-specific data - such as calibration offsets, chemistry type, serial number, and warranty information - even during deep discharge or temporary short-circuit events. RAM contents are automatically transferred to flash upon host command or power-on reset.
Can the BQ2019PWRG4 operate from a single Li-ion cell?
Yes, the BQ2019PWRG4 is explicitly designed for single-cell Li-ion applications, with a supply voltage range of 2.8 V to 5.5 V. It can be powered directly from the battery terminal (BAT+) without regulation in such configurations. The datasheet states "Ideal for Single-Cell Li-Ion or 3-Cell NiMH Applications" and confirms operation down to 2.8 V in the Recommended Operating Conditions table - ensuring reliable function across the full Li-ion discharge curve.
BQ2019PWRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
BQ2019PWRG4 FAQ
1.How can I place an order for BQ2019PWRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ2019PWRG4 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 BQ2019PWRG4 reliable?
The price and inventory of BQ2019PWRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ2019PWRG4 is usually 5 days.
3.What payment methods are accepted for BQ2019PWRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ2019PWRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ2019PWRG4?
BQ2019PWRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ2019PWRG4 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 BQ2019PWRG4?
For technical support, including BQ2019PWRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ2019PWRG4 requirements.
6.How does Aetrix verify that BQ2019PWRG4 is sourced from the original manufacturer or authorized distributors?
All BQ2019PWRG4 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 BQ2019PWRG4 meets industry standards.
7.What is the process for return or replacement of BQ2019PWRG4?
All BQ2019PWRG4 units undergo pre-shipment inspection (PSI). If there is an issue with BQ2019PWRG4, 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 BQ2019PWRG4 part is unused and in its original packaging.
Return procedure for BQ2019PWRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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