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Texas Instruments BQ2050HSN-A508TR
- Part No.:
- BQ2050HSN-A508TR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
BQ2050HSN-A508TR.pdf
- Description:
- IC GAS GAUGE LITH-ION 16-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,497
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Product details
Overview
BQ2050HSN-A508TR from Texas Instruments is a lithium-ion battery fuel gauge IC that measures available capacity with ±1% typical accuracy across temperature and discharge rate, monitors voltage drop across a sense resistor for charge/discharge integration, compensates for self-discharge and temperature, and drives five-segment LED indicators directly. It is used in portable Li-ion battery packs for consumer electronics requiring precise state-of-charge indication.
For engineers reviewing the BQ2050HSN-A508TR datasheet, BQ2050HSN-A508TR pinout, BQ2050HSN-A508TR application, or BQ2050HSN-A508TR equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative parts, and supply support details specific to this narrow SOIC-16 variant.
Technical Context
The BQ2050HSN-A508TR implements coulomb counting using a precision analog front-end that integrates voltage across an external sense resistor (SR pin), applies real-time temperature- and rate-based compensation via internal lookup tables, and maintains non-volatile register state during low-VCC operation via RBI backup input. Its HDQ single-wire interface operates at 5 kbps with return-to-one timing and supports read/write access to 32+ registers including NAC, CACT, LMD, and VSB.
It features dual-function pins (e.g., SEG1/PROG1) enabling hardware-programmable full-count thresholds (PFC), scale factors (1/80 to 1/2560 mVh/count), and self-discharge rates (NAC16 to NAC2048 per day), while its CFC output actively controls the charge FET in Li-ion protection circuits based on overvoltage or out-of-range temperature detection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Accuracy | ±1% typical available capacity error after learning cycle; enables reliable SOC estimation without host MCU intervention |
| Operating Current | 120 µA typical; allows continuous monitoring in always-on battery pack applications without significant drain |
| Data Retention Current | <100 nA; preserves register contents during deep sleep or storage using only capacitor or cell backup on RBI |
| Communication Interface | 5 kb/s HDQ single-wire bus; reduces PCB routing complexity and microcontroller GPIO usage vs I²C/SPI |
| Sense Resistor Range | Supports 0.01 Ω to 0.1 Ω sense resistors; accommodates 50 mA–1 A current ranges with <250 µV digital filter threshold |
| Temperature Compensation | 10°C step resolution from –35°C to +85°C; corrects NAC for graphite or coke anode chemistries using Tables 3A/B and 4A/B |
| LED Drive Capability | Direct open-drain drive of 5-segment LEDs via LCOM and SEG1–SEG5; eliminates need for external LED drivers or current-limiting resistors |
Pinout & Package
Package: 16-pin narrow SOIC (SOIC-N), 3.9 mm width, 1.75 mm height, 0.65 mm pitch - compatible with standard automated assembly processes and space-constrained battery pack layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VSS | System ground reference | Single-point ground connection for SR and analog circuitry; critical for minimizing offset voltage (VOS) errors in current sensing |
| SR | Sense resistor input | High-impedance differential input measuring voltage drop across series sense resistor; polarity determines charge (+) vs discharge (–) integration direction |
| LCOM | LED common output | Open-drain switch sourcing current to all five LED segments; high-impedance when display is off to avoid false activation |
| SEG1/PROG1 to SEG5/PROG5 | Dual-function LED segment outputs / programming inputs | Three-level logic (H/Z/L) on PROG pins sets PFC, scale factor, and self-discharge rate; same pins sink LED current when configured as SEG outputs |
| CFC | Charge FET control output | Active-low open-drain output disabling charge path when VSB > NMCV or temperature outside 0–60°C; interfaces directly with protection IC gate drivers |
| HDQ | Serial communications I/O | Single-wire bidirectional interface with internal pull-down; requires external pull-up on host side; supports command-based register read/write at 5 kb/s |
| RBI | Register backup input | Accepts capacitor or bottom-cell backup voltage ≥2.5 V to retain register contents when VCC drops below 3.0 V; VCC is internally routed to RBI above threshold |
| DISP | Display control input | Logic level selects LED behavior: low = active display, high = disabled, floating = active during charge only |
Key Features
| Feature | Design Value |
|---|---|
| Automatic capacity learning | Updates Last Measured Discharge (LMD) register only after full discharge to EDV1, ensuring accurate "100%" reference adapts to aging and usage patterns |
| Programmable self-discharge compensation | Eight temperature-dependent rates (NAC16 to NAC2048/day) selectable via PROG5; disables entirely when PROG5 = H |
| Integrated protection supervision | Monitors PSTAT input and disables charge via CFC if protector reports overvoltage or thermal fault, adding redundancy to standalone protection ICs |
| Relative display mode | Uses LMD as dynamic 100% reference instead of fixed PFC, improving SOC linearity across battery lifetime without recalibration |
| Low-power serial interface | HDQ bus consumes <10 µA average during communication; avoids wake-up overhead of clocked interfaces like I²C |
Applications
| Smartphone Battery Packs | Tablet Power Management |
|---|---|
Use Scenario: Integrated into multi-cell Li-ion battery packs to provide real-time state-of-charge (SOC) to system PMIC or application processor. IC Role / Device Role / Timing Role: Primary fuel gauge performing coulomb counting, temperature-compensated capacity estimation, and LED-based user-facing charge indication. Use Value: Enables accurate battery remaining time prediction and prevents unexpected shutdown by detecting true end-of-discharge via dual EDV thresholds (0.76 V and 0.735 V). |
Use Scenario: Mounted on tablet battery module PCB to monitor capacity, voltage, and temperature while supporting hot-swap and firmware updates. IC Role / Device Role / Timing Role: Standalone gas gauge interfacing via HDQ to host MCU; manages register backup via RBI during suspend-to-RAM cycles. Use Value: Reduces BOM cost by eliminating separate LED driver IC and simplifies layout with single-wire communication and direct LED drive capability. |
| Wireless Headset Battery Modules | Portable Medical Devices |
Use Scenario: Embedded in compact earbud charging case battery to track charge cycles and estimate remaining charge across repeated short-duration discharges. IC Role / Device Role / Timing Role: Low-current fuel gauge operating at 120 µA typical; uses DISP pin to activate LED display only during charging events. Use Value: Extends standby time with <100 nA data retention current and supports precise capacity tracking despite high self-discharge rates typical of small Li-ion cells. |
Use Scenario: Used in battery-powered insulin pumps and portable ECG monitors where accurate runtime prediction is critical for patient safety. IC Role / Device Role / Timing Role: Safety-relevant fuel gauge providing compensated available capacity (CACT) and scaled available energy (SAE) to host controller for alarm triggering. Use Value: Delivers ±1% capacity accuracy across –20°C to +60°C operating range and supports medical-grade validation with traceable register access and reset command sequence. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar lithium-ion fuel gauge applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ2050HSN-A508 | No TR suffix; reel packaging absent; identical electrical specs and pinout | Same functional use in production but lacks tape-and-reel logistics for SMT lines | Select BQ2050HSN-A508TR for automated assembly; choose BQ2050HSN-A508 only for prototyping or manual soldering |
| BQ2057WSN | Includes integrated thermistor interface and enhanced SMBus support; no HDQ bus; different register map and LED drive architecture | Requires SMBus host and external ADC for temperature; not pin-compatible; no direct LED segment outputs | Choose BQ2057WSN only when migrating to SMBus infrastructure and needing thermistor-based temperature profiling |
Compared with BQ2050HSN-A508TR, BQ2050HSN-A508 offers identical functionality but lacks tape-and-reel packaging, while BQ2057WSN replaces HDQ with SMBus and removes direct LED drive-making neither a drop-in replacement but viable alternatives for revised system architectures.
Availability
BQ2050HSN-A508TR is available at Aetrix Electronics and suitable for smartphone battery packs, tablet power management systems, wireless headset modules, portable medical devices, and industrial handheld instruments requiring stable component supply and long-term lifecycle support.
Supply support for BQ2050HSN-A508TR 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 BQ2050HSN-A508TR belongs to TI's Power Gauge™ family of fuel gauge ICs, designed specifically for cost-sensitive, space-constrained Li-ion battery packs requiring high-accuracy capacity reporting without host processor overhead.
FAQ
What is the primary function of the BQ2050HSN-A508TR?
The BQ2050HSN-A508TR is a lithium-ion fuel gauge IC that performs real-time coulomb counting, temperature- and rate-compensated capacity estimation, and direct LED-based state-of-charge indication. It autonomously tracks available capacity using a sense resistor and internal algorithms, delivering ±1% typical accuracy after learning. The BQ2050HSN-A508TR does not require continuous host MCU involvement for basic operation.
How does the BQ2050HSN-A508TR handle battery aging and capacity drift?
The BQ2050HSN-A508TR handles aging through automatic capacity learning: it updates the Last Measured Discharge (LMD) register only after a full discharge from full to EDV1, establishing a new dynamic 100% reference. This ensures the BQ2050HSN-A508TR adapts to reduced capacity over time without manual recalibration. The CPI register tracks capacity inaccuracy to flag when LMD hasn't updated in 64 valid charges.
Can the BQ2050HSN-A508TR operate without an external microcontroller?
Yes, the BQ2050HSN-A508TR can operate autonomously: it powers from the battery pack, drives LEDs directly, and maintains accurate capacity estimates using internal compensation tables. An external microcontroller is optional-used only for advanced diagnostics, register configuration, or reading extended parameters (e.g., SAE, temperature) via the HDQ interface. The BQ2050HSN-A508TR functions fully without it.
What is the role of the RBI pin on the BQ2050HSN-A508TR?
The RBI pin on the BQ2050HSN-A508TR provides backup power to retain register contents when VCC drops below 3.0 V. It accepts either a storage capacitor or a dedicated backup cell (e.g., bottom series cell with isolation diode). When VCC ≥3.0 V, the BQ2050HSN-A508TR routes VCC to RBI; below that threshold, RBI sustains registers at <100 nA retention current-ensuring no loss of learned capacity or status flags during power interruption.
Does the BQ2050HSN-A508TR support graphite- and coke-anode Li-ion batteries?
Yes, the BQ2050HSN-A508TR supports both anode types via PROG5 pin configuration: PROG5 = L selects graphite-anode compensation (Tables 3A/B), while PROG5 = Z selects coke-anode (Tables 4A/B). Each uses distinct discharge-rate and temperature correction factors applied to Nominal Available Capacity (NAC) to generate Compensated Available Capacity (CACT), ensuring accurate SOC across chemistries. The BQ2050HSN-A508TR applies these corrections automatically once programmed.
BQ2050HSN-A508TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- Power Gauge™
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Battery Monitor
- Battery Chemistry:
- Lithium Ion
- Number of Cells:
- -
- Fault Protection:
- -
- Interface:
- HDQ
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
BQ2050HSN-A508TR FAQ
1.How can I place an order for BQ2050HSN-A508TR through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ2050HSN-A508TR 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 BQ2050HSN-A508TR reliable?
The price and inventory of BQ2050HSN-A508TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ2050HSN-A508TR is usually 5 days.
3.What payment methods are accepted for BQ2050HSN-A508TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ2050HSN-A508TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ2050HSN-A508TR?
BQ2050HSN-A508TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ2050HSN-A508TR 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 BQ2050HSN-A508TR?
For technical support, including BQ2050HSN-A508TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ2050HSN-A508TR requirements.
6.How does Aetrix verify that BQ2050HSN-A508TR is sourced from the original manufacturer or authorized distributors?
All BQ2050HSN-A508TR 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 BQ2050HSN-A508TR meets industry standards.
7.What is the process for return or replacement of BQ2050HSN-A508TR?
All BQ2050HSN-A508TR units undergo pre-shipment inspection (PSI). If there is an issue with BQ2050HSN-A508TR, 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 BQ2050HSN-A508TR part is unused and in its original packaging.
Return procedure for BQ2050HSN-A508TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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