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Texas Instruments BQ2050HSN-A508
- Part No.:
- BQ2050HSN-A508
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
BQ2050HSN-A508.pdf
- Description:
- IC GAS GAUGE LITH-ION 16-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:166
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Product details
Overview
BQ2050HSN-A508 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 sense-resistor voltage drop (VSR) for charge/discharge integration, and drives five-segment LED indicators directly via LCOM/SEGx outputs - deployed in portable medical devices, power tools, and smart battery packs.
For engineers reviewing the BQ2050HSN-A508 datasheet, BQ2050HSN-A508 pinout, BQ2050HSN-A508 application, or BQ2050HSN-A508 equivalent, this page delivers verified functional identity, HDQ bus timing constraints, LED display control logic, self-discharge compensation tables per PROG5 state, and real-world pack protection supervision behavior with CFC output and PSTAT monitoring.
Technical Context
The BQ2050HSN-A508 implements coulomb counting with dual-stage compensation: first, discharge-rate-dependent correction (Tables 3A/4A), then temperature- and anode-type–dependent adjustment (Tables 3B/4B), yielding Compensated Available Capacity (CACT) used for LED display. It integrates VSR at up to 2 counts/s (90 µV nominal resolution) with digital magnitude filtering (250 µV threshold).
Its HDQ interface operates at 5 kb/s with return-to-one asynchronous protocol, requiring host-side pulse-width capture or bit-banged GPIO; register access includes read/write of NAC (03h/17h), CACT (0Dh), SAE (0Fh/10h), and FLGS1 (01h) status flags including CI (capacity inaccurate) and VDQ (valid discharge). The CFC output actively disables Li-ion charge FETs when VSB exceeds NMCV or temperature falls outside 0–60°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Measurement Accuracy | ±1% typical error in available capacity under varying temperature and discharge rate - enables reliable runtime estimation without periodic full recalibration. |
| Operating Current | 120 µA typical - allows continuous operation in low-power battery packs without significant drain during standby. |
| Data Retention Current | <100 nA - preserves register state (LMD, NAC, CPI) during deep sleep or cell removal using RBI backup capacitor. |
| HDQ Interface Speed | 5 kb/s - supports lightweight microcontroller polling without dedicated UART, reducing system BOM cost. |
| Sense Resistor Input Range | VSR resolution down to 90 µV (2 counts/s) with 250 µV digital filter threshold - rejects noise while capturing low-current activity. |
| LED Drive Capability | Direct open-drain LCOM output sourcing VCC + five SEGx sink drivers - eliminates external LED driver IC in 5-segment indicator designs. |
| Self-Discharge Compensation | Programmable via PROG5: NAC512/day @ 20–30°C (Z), NAC1024/day @ 10–20°C (L), disabled if PROG5 = H - matches real Li-ion aging profiles. |
Pinout & Package
16-pin narrow SOIC (SOIC-16N) package, 3.9 mm width, 1.75 mm height, 1.27 mm pitch. Pin 1 marked by beveled corner or dot; pin 16 is VSS (ground), pin 8 is VCC (supply), pin 9 is LCOM (LED common), pins 10–14 are SEG1/PROG1 through SEG5/PROG5 (dual-function), pin 15 is CFC (charge FET control), pin 1 is VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Supply voltage input | Accepts 2.7–5.5 V; powers internal circuitry and enables LCOM output sourcing. |
| VSS | System ground | Reference for SR, HDQ, and all analog inputs; must be single-point star ground to minimize VOS error. |
| SR | Sense resistor input | Differential input measuring voltage drop across series sense resistor; offset voltage (VOS) highly layout-sensitive. |
| LCOM | LED common output | Open-drain switch pulling VCC to source current for all five LEDs; high-impedance when display is off. |
| SEG1/PROG1 – SEG5/PROG5 | Dual-function terminal | As SEGx: sink drivers for LED segments; as PROGx: three-level inputs setting PFC, scale factor, and self-discharge rate. |
| CFC | Charge FET control output | Active-low open-drain output disabling charge path when overvoltage or out-of-range temperature detected. |
| HDQ | Serial communications I/O | Single-wire bidirectional interface with 5 kb/s max rate; requires external pull-up resistor on host side. |
| RBI | Register backup input | Provides backup power to registers when VCC ≤3 V; accepts capacitor or bottom-cell supply with isolation diode. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated LED display driver | Eliminates external LED driver IC and reduces PCB area by ≥12 in² in compact battery packs. |
| HDQ single-wire interface | Reduces host MCU pin count and firmware complexity versus SMBus/I²C; no clock line or address arbitration required. |
| Automatic capacity learning | Updates Last Measured Discharge (LMD) only after full discharge to EDV1, ensuring accurate "100%" reference without charger dependency. |
| Programmable self-discharge model | Eight temperature bands (Table 5) and anode-type selection (PROG5) match real Li-ion chemistry behavior across -20°C to +70°C. |
| Pack-level protection supervision | CFC output and PSTAT input enable coordinated response with external protector ICs - e.g., disable charging if VSB > NMCV or T < 0°C. |
Applications
| Smart Power Tools | Portable Medical Monitors |
|---|---|
|
Use Scenario: Cordless drill/driver with 2S Li-ion pack delivering 10–30 A peak discharge. IC Role / Device Role / Timing Role: Fuel gauge IC performing real-time coulomb counting, compensating for 2C+ discharge rates and motor-induced thermal rise. Use Value: Accurate remaining runtime display prevents unexpected shutdown mid-task; CFC output halts charging if cell voltage exceeds 4.3 V during fast recharge. |
Use Scenario: Battery-powered ECG monitor operating 8–12 hours per charge with strict low-power requirements. IC Role / Device Role / Timing Role: Low-current fuel gauge maintaining register state via RBI backup during sleep mode; LED display activated on button press. Use Value: 120 µA operating current extends standby time; <100 nA data retention ensures capacity history survives 30-day storage without battery replacement. |
| Two-Wheel Electric Scooters | Enterprise Barcode Scanners |
|
Use Scenario: 36 V (10S) Li-ion pack powering motor controller and display with frequent partial charges. IC Role / Device Role / Timing Role: Gas gauge IC tracking cumulative discharge and self-discharge across variable loads; LMD updated only after full discharge cycles. Use Value: Prevents capacity overstatement from partial charges; PROG5 configuration selects graphite-anode compensation for modern high-energy cells. |
Use Scenario: Rugged handheld scanner used in warehouses with 8-hour shift cycles and overnight charging. IC Role / Device Role / Timing Role: LED-driven fuel gauge providing visual state-of-charge feedback; HDQ interface reports NAC and temperature to host MCU every 5 seconds. Use Value: Five-segment display gives intuitive 20% granularity; HDQ's 5 kb/s speed avoids interrupt latency issues in resource-constrained 8-bit MCUs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fuel gauge applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ2057W | Integrated 1-cell Li-ion charger controller + fuel gauge; lacks HDQ interface and LED drive; uses SMBus. | Requires external charger IC; not suitable for standalone fuel gauge use or LED-only displays. | Select BQ2057W only when combining charge control and gauging in space-constrained single-cell systems. |
| BQ27210 | Lower quiescent current (55 µA), supports Impedance Track™ algorithm, no native LED driver, uses I²C. | Higher accuracy in dynamic load conditions but needs external LED driver and I²C-capable host. | Choose BQ27210 for ultra-low-power applications where runtime prediction trumps LED simplicity. |
Compared with BQ2050HSN-A508, BQ2057W integrates charging control but sacrifices LED drive and HDQ simplicity, while BQ27210 improves accuracy and power efficiency at the cost of added system complexity and loss of direct LED interface.
Availability
BQ2050HSN-A508 is available at Aetrix Electronics and suitable for portable medical devices, cordless power tools, electric two-wheelers, and enterprise mobile computing requiring stable component supply and long-term lifecycle support.
Supply support for BQ2050HSN-A508 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 battery management innovation.
The BQ2050HSN-A508 belongs to TI's Power Gauge™ family, designed specifically for cost-sensitive, space-constrained Li-ion battery packs needing accurate fuel gauging without external microcontrollers or complex communication stacks.
FAQ
What is the primary function of the BQ2050HSN-A508?
The BQ2050HSN-A508 is a dedicated lithium-ion fuel gauge IC that performs real-time coulomb counting using a sense resistor, applies temperature- and discharge-rate–based compensation to deliver accurate available capacity (NAC and CACT), and drives five-segment LED indicators directly. It does not include charging control or host processor functionality - its role is strictly battery state monitoring and visual indication within the pack.
How does the BQ2050HSN-A508 handle battery capacity learning?
The BQ2050HSN-A508 learns battery capacity by updating the Last Measured Discharge (LMD) register only after a full discharge cycle from full charge to the EDV1 threshold (0.76 V/cell). During this qualified discharge, the Discharge Count Register (DCR) value transfers to LMD, establishing the new 100% reference. Partial charges or discharges do not update LMD, preventing inaccurate capacity drift in real-world usage patterns.
Can the BQ2050HSN-A508 operate without an external microcontroller?
Yes - the BQ2050HSN-A508 can operate autonomously: it powers from the battery pack (VCC), drives LEDs directly via LCOM/SEGx, and provides visual state-of-charge feedback without any host communication. The HDQ interface is optional; if unused, the HDQ pin may be left floating. All core gauging functions - including self-discharge compensation, temperature adaptation, and CFC-based protection - run independently.
What is the role of the CFC pin on the BQ2050HSN-A508?
The CFC (Charge FET Control) pin on the BQ2050HSN-A508 is an active-low open-drain output that disables the Li-ion pack's charge FET when unsafe conditions are detected - specifically, if the battery voltage (VSB) exceeds the programmed NMCV threshold or if temperature falls outside the 0–60°C range. This provides hardware-level coordination with external protection circuits, independent of host MCU intervention.
How does the BQ2050HSN-A508 compensate for temperature effects on capacity?
The BQ2050HSN-A508 uses internal temperature sensing (10°C resolution, -30°C to +80°C) to apply two-tier compensation: first, discharge-rate correction (Tables 3A/4A), then temperature- and anode-type–dependent adjustment (Tables 3B/4B). For example, at -10°C to 0°C, graphite-anode cells incur a 5% LMD reduction, while coke-anode cells incur 10%. These corrections are applied to derive CACT, the value used for LED display and host readout.
BQ2050HSN-A508 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- Power Gauge™
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- 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-A508 FAQ
1.How can I place an order for BQ2050HSN-A508 through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ2050HSN-A508 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-A508 reliable?
The price and inventory of BQ2050HSN-A508 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ2050HSN-A508 is usually 5 days.
3.What payment methods are accepted for BQ2050HSN-A508?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ2050HSN-A508 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ2050HSN-A508?
BQ2050HSN-A508 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ2050HSN-A508 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-A508?
For technical support, including BQ2050HSN-A508 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ2050HSN-A508 requirements.
6.How does Aetrix verify that BQ2050HSN-A508 is sourced from the original manufacturer or authorized distributors?
All BQ2050HSN-A508 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-A508 meets industry standards.
7.What is the process for return or replacement of BQ2050HSN-A508?
All BQ2050HSN-A508 units undergo pre-shipment inspection (PSI). If there is an issue with BQ2050HSN-A508, 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-A508 part is unused and in its original packaging.
Return procedure for BQ2050HSN-A508:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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