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Texas Instruments BQ2019PW
- Part No.:
- BQ2019PW
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ2019PW.pdf
- Description:
- IC BAT MON MULT-CHEM 1-3C 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:167
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Product details
Overview
BQ2019PW 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 features a single-wire HDQ interface - enabling host-controlled battery management in portable electronics such as cellular phones and PDAs.
For engineers reviewing the BQ2019PW datasheet, BQ2019PW pinout, BQ2019PW application, or BQ2019PW equivalent, this page delivers verified technical context, real-world register-level functionality, low-power operation thresholds, flash memory architecture, and validated alternative options for battery fuel-gauge system design.
Technical Context
The BQ2019PW implements a voltage-to-frequency converter (VFC) to digitize charge/discharge current via SR–VSS sensing, with 3.05 µV/LSB resolution and ±500 µV uncalibrated offset. Its internal timebase eliminates external crystal dependency, and oscillator accuracy is programmable via OSC pin resistor (±3% error at 100 kΩ).
It supports flash-backed RAM (32 bytes), 96 bytes of flash (including 32-byte shadow flash), and 8-byte ID ROM for persistent battery data storage. The device operates in two modes: Normal (full counter/timer activity) and Sleep (<1.5 µA), triggered by host command and configurable WOE thresholds down to 0.502 mV.
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 packs without external regulation. |
| Operating Current | <80 µA at 4.3 V - enables multi-week runtime in battery-powered host systems during active monitoring. |
| Sleep Current | <1.5 µA - maintains self-discharge tracking while minimizing quiescent drain during idle periods. |
| VFC Resolution | 3.05 µV/LSB - enables precise coulomb counting with sub-mA accuracy across typical sense-resistor values (e.g., 20 mΩ). |
| Temperature Sensing | Internal die sensor reporting in °K (9-bit resolution, ±3°K accuracy at 3.6 V) - eliminates thermistor BOM cost and layout complexity. |
| Memory Resources | 32-byte RAM + 96-byte flash (64-byte general-purpose + 32-byte shadow) + 8-byte ID ROM - stores calibrated offsets, chemistry parameters, serial IDs, and warranty data nonvolatively. |
| Interface | Single-wire HDQ (5 kbit/s max) - reduces PCB routing count and connector pin count versus I²C/SMBus solutions. |
Pinout & Package
Packaged in an 8-lead TSSOP (PW), the BQ2019PW uses a compact surface-mount footprint (3.0 mm × 4.4 mm, 0.65 mm pitch) suitable for space-constrained battery pack PCBs.
| 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 - optional in single-cell Li-ion apps where VCC = BAT+. |
| VCC (Pin 2) | Power supply input | Main supply rail (2.8–5.5 V); powers all internal circuitry including VFC, timers, RAM, and HDQ interface. |
| VSS (Pin 3) | Ground reference | Common return path for SR sense voltage, digital logic, and internal temperature sensor - must be low-impedance connection. |
| HDQ (Pin 4) | Single-wire bidirectional I/O | Asynchronous serial interface for register read/write, flash programming, and sleep/wake commands - requires external pullup. |
| OSC (Pin 5) | Oscillator time-base adjust | Current-source output setting internal clock frequency via external resistor - enables trimming for ±3% timer accuracy. |
| DC (Pin 6) | Internal connection only | No external connection required - internal test node; floating or tied to VSS per layout guidelines. |
| SR (Pin 7) | Current-sense input | Differential input measuring voltage drop across external sense resistor (–100 mV to +100 mV range) - feeds VFC for coulomb counting. |
| STAT (Pin 8) | Open-drain status output | Configurable general-purpose output (e.g., low-battery flag or charger enable) - driven by host via HDQ register writes. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated temperature sensor | Eliminates need for external thermistor and associated calibration - reduces BOM count and improves thermal response fidelity. |
| Flash-shadowed RAM | 32 bytes of RAM automatically backed up to flash on command - preserves critical battery state (e.g., SOC, cycle count) across deep discharge or short-circuit events. |
| Programmable sleep threshold (WOE) | 7 selectable current-sense thresholds (0.502–3.516 mV) - allows precise trade-off between power savings and responsiveness to small leakage currents. |
| VFC offset calibration & compensation | Host-initiated auto-calibration (CALREQ/CALOK) and automatic register-based compensation (COMPEN bit) - corrects for sense-resistor drift and amplifier offset without host software intervention. |
| Self-discharge modeling | SCR increments at 1 count/hour at 25°C, doubling every +10°C - enables accurate capacity loss prediction during storage without external temperature logging. |
Applications
| Smartphone Battery Pack | Tablet Power Management |
|---|---|
|
Use Scenario: Real-time state-of-charge tracking and end-of-charge termination in compact Li-ion battery modules. IC Role / Device Role / Timing Role: Coulomb counter and temperature-aware fuel gauge interfacing with host PMIC over HDQ. Use Value: Enables accurate remaining runtime estimation and prevents overcharge via calibrated VFC integration and self-discharge compensation. |
Use Scenario: Multi-parameter battery health monitoring in detachable tablet battery packs with limited board area. IC Role / Device Role / Timing Role: Standalone battery monitor providing SOC, temperature, and cycle history via flash-stored metadata. Use Value: Supports OEM battery authentication and warranty validation using 8-byte ID ROM and user-programmable flash pages. |
| Wearable Device Power System | Medical Portable Monitor |
|
Use Scenario: Ultra-low-power battery telemetry in hearables and fitness trackers requiring weeks of standby life. IC Role / Device Role / Timing Role: Sleep-mode-optimized fuel gauge maintaining SCR updates while drawing <1.5 µA from cell. Use Value: Delivers reliable capacity reporting during long-term storage and intermittent usage without compromising runtime. |
Use Scenario: Critical battery status reporting in FDA-classified portable medical devices with strict data retention requirements. IC Role / Device Role / Timing Role: Nonvolatile battery parameter recorder storing calibration data, manufacturing date, and self-discharge logs in flash. Use Value: Meets regulatory traceability needs via 5-year flash data retention and factory-programmable ID ROM serialization. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery fuel-gauge applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ2013H | Same HDQ interface and VFC architecture but lacks internal temperature sensor and REG output; 24-pin TSSOP package. | Requires external thermistor and regulator circuit - increases BOM and layout complexity vs. BQ2019PW's integrated functions. | Choose when legacy design reuse is prioritized and space/power constraints allow added components. |
| BQ2018 | Successor with enhanced flash (128 bytes), improved VFC linearity (0.2% INL), and extended temperature range (–40°C to 85°C). | Supports wider industrial operating conditions and higher-resolution calibration - not drop-in due to different register map and timing. | Prefer for new designs needing extended temp range or longer flash endurance (100k cycles vs. 10k). |
Compared with BQ2019PW, BQ2013H requires external thermal and regulation support, increasing system cost and size, while BQ2018 offers higher precision and reliability at the cost of firmware migration effort and non-pin-compatible packaging.
Availability
BQ2019PW is available at Aetrix Electronics and suitable for smartphone battery packs, medical portable monitors, wearable power systems, and tablet energy management requiring stable component supply and long-lifecycle support.
Supply support for BQ2019PW 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 leadership in battery management ICs.
The BQ2019PW belongs to TI's early-generation smart battery monitor product line, engineered specifically for cost-sensitive, space-constrained portable Li-ion and NiMH applications requiring integrated fuel gauging without external crystals or thermistors.
FAQ
What is the primary function of the BQ2019PW in a battery system?
The BQ2019PW serves as a standalone coulomb-counting fuel gauge IC that measures charge/discharge current via its VFC-based SR input, integrates that data into CCR/DCR registers, and reports state-of-charge to a host controller over HDQ. It also tracks temperature, self-discharge, and stores battery metadata in nonvolatile flash - making it central to intelligent battery pack management in portable electronics.
Does the BQ2019PW require an external crystal oscillator?
No, the BQ2019PW does not require an external crystal oscillator. It uses an internal timebase whose frequency is adjustable via the OSC pin and an external resistor. At ROSC = 100 kΩ, timer accuracy is ±3%, eliminating crystal BOM cost and PCB area - a key differentiator from many competing fuel gauges.
How does the BQ2019PW handle current-sense offset calibration?
The BQ2019PW supports two offset calibration methods: host-triggered via CALREQ bit in CAL/OFFCTH register, or autonomous via FCMD calibrate-and-power-down command. Upon successful calibration, the OFFCTH/OFFCTM/OFFCTL registers store the 19-bit offset value (LSB = 9.76 ms), and automatic compensation can be enabled using the COMPEN bit to adjust CCR/DCR counts in real time.
What memory resources does the BQ2019PW provide for battery data storage?
The BQ2019PW provides 32 bytes of flash-shadowed RAM (retained in flash on command), 96 bytes of flash memory (64 bytes general-purpose + 32 bytes shadow), and 8 bytes of factory-programmable ID ROM. This architecture enables secure serialization, chemistry-specific parameters, calibrated offsets, and warranty data storage - all preserved through deep discharge or temporary short-circuit events.
Can the BQ2019PW operate directly from a single Li-ion cell?
Yes, the BQ2019PW operates directly from a single Li-ion cell (2.8 V to 4.2 V nominal) without external regulation. Its VCC range is 2.8 V to 5.5 V, and the REG pin is optional - omitted in single-cell configurations per TI application guidance. In multicell NiMH packs (3–4 cells), REG may drive an external JFET to regulate VCC.
BQ2019PW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- 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
BQ2019PW FAQ
1.How can I place an order for BQ2019PW through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ2019PW 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 BQ2019PW reliable?
The price and inventory of BQ2019PW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ2019PW is usually 5 days.
3.What payment methods are accepted for BQ2019PW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ2019PW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ2019PW?
BQ2019PW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ2019PW 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 BQ2019PW?
For technical support, including BQ2019PW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ2019PW requirements.
6.How does Aetrix verify that BQ2019PW is sourced from the original manufacturer or authorized distributors?
All BQ2019PW 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 BQ2019PW meets industry standards.
7.What is the process for return or replacement of BQ2019PW?
All BQ2019PW units undergo pre-shipment inspection (PSI). If there is an issue with BQ2019PW, 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 BQ2019PW part is unused and in its original packaging.
Return procedure for BQ2019PW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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