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Texas Instruments BQ2050SN-D119
- Part No.:
- BQ2050SN-D119
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
BQ2050SN-D119.pdf
- Description:
- IC GAS GAUGE LI-ION 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,354
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Product details
Overview
BQ2050SN-D119 from Texas Instruments is a lithium-ion battery fuel gauge IC designed for integration into battery packs or end systems to deliver conservative, repeatable estimation of available capacity. It operates from 3.0–6.5V, draws 120µA typical supply current, uses a 16-pin narrow SOIC package, and supports both LED-based charge-state display and single-wire serial communication with host processors - enabling real-time monitoring in portable medical devices and power tools.
For engineers reviewing the BQ2050SN-D119 datasheet, BQ2050SN-D119 pinout, BQ2050SN-D119 application, or BQ2050SN-D119 equivalent, key selection considerations include its integrated temperature-compensated coulomb counting, self-discharge modeling using internal thermal sensing, programmable full-count (PFC) configuration via PROG pins, and support for graphite- or coke-anode Li-ion chemistries across –35°C to +85°C.
Technical Context
The BQ2050SN-D119 implements analog front-end voltage sensing across a series sense resistor (SR pin) to measure charge/discharge current, with digital integration and compensation applied for temperature, discharge rate, and anode type. Its gas gauge algorithm maintains three core counters: Nominal Available Capacity (NAC), Last Measured Discharge (LMD), and Discharge Count Register (DCR), enabling adaptive capacity learning over full discharge cycles.
It features dual-mode output: open-drain LED segment drivers (SEG1–SEG5) with LCOM common sink for direct visual indication, and a bidirectional single-wire DQ interface compliant with asynchronous return-to-one protocol at ≤333 bits/sec. Internal registers include temperature (02h), NAC (03h/17h), CAC (0Dh/0Eh), and VSB (0Bh), all accessible via command-based read/write operations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.0–6.5V - powers directly from single-cell Li-ion (VBAT > 3V); REF output enables low-cost regulation for multi-cell packs. |
| Operating Current | 120µA typical - enables long-term operation in battery-backed systems without significant drain impact. |
| Current Sensing | Voltage drop across external sense resistor (RS); digital filter thresholds: VSRQ = 210µV (charge), VSRD = –200µV (discharge). |
| Temperature Range | –35°C to +85°C - internal sensor provides 10°C-step resolution (0x–Cx codes) for compensation and reporting. |
| Self-Discharge Compensation | Programmable rate (PROG5): nominal 1512 × NAC/day at 20–30°C; disabled if PROG5 = H; varies across 8 temperature bands. |
| Communication Interface | Single-wire bidirectional DQ (open-drain) - supports command-based register access at ≤333 bits/sec; no external clock required. |
| LED Display Support | 5-segment direct-drive outputs (SEG1–SEG5) with LCOM sink - enables relative capacity bar graph without external driver IC. |
Pinout & Package
Package: 16-pin narrow SOIC (0.154" width), RoHS-compliant, surface-mount.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply input | 3.0–6.5V main supply; powers internal circuitry and drives LCOM output. |
| VSS | System ground | Reference node for SR, SB, DQ, and all analog/digital logic; must be single-point ground per layout guidelines. |
| SR | Sense resistor input | Monitors voltage drop across external RS between battery negative and ground; determines charge/discharge direction and magnitude. |
| DQ | Serial I/O | Open-drain bidirectional data line; requires external pull-up; implements return-to-one protocol for register reads/writes. |
| LCOM | LED common output | Open-drain switch sourcing current from VCC to SEG1–SEG5; off during initialization to allow PROG pin resistor reading. |
| SEG1/PROG1 – SEG5/PROG5 | Dual-function pins | Segment outputs (sink mode) or three-level programming inputs (H/Z/L) for PFC, scale factor, and self-discharge rate. |
| PROG6 | Initialization control | Three-level input defining initial NAC state on reset (0%, 50%, or 100% of PFC); affects first-cycle capacity reporting. |
| DISP | Display enable | Active-low control: high disables LEDs; floating enables display during charge; low activates display unconditionally. |
| SB | Battery voltage monitor | High-impedance input for resistive divider; used to detect EDV1 (1.52V) and EDVF (1.47V) thresholds per cell. |
| RBI | Register backup | Accepts capacitor or auxiliary supply to retain register contents when VCC drops below 3.0V; VCC is output on RBI when active. |
| REF | Voltage reference | Stable output for external transistor-based regulator; supports systems with >1 Li-ion cell in series. |
| N/C | No connect | Pin 3 is unconnected; must remain floating per datasheet. |
Key Features
| Feature | Design Value |
|---|---|
| Conservative capacity estimation | Uses learned LMD as 100% reference in relative display mode - avoids overstatement by anchoring to actual full-to-empty discharge history. |
| Integrated temperature compensation | Applies discrete correction factors (e.g., 1.35× at –10°C to 0°C for graphite anodes) to NAC and CAC - improves accuracy across industrial temperature ranges. |
| Self-discharge modeling | Adjusts NAC decrement rate based on internal temperature step (e.g., NAC512/day at 20–30°C) - eliminates need for manual aging calibration. |
| Programmable full-count (PFC) | Configured via PROG1–PROG4 (9 options from 12.0–49.152 mVh); matches battery capacity × sense resistor value - ensures optimal resolution for given hardware. |
| End-of-discharge warning | EDV1 (1.52V) and EDVF (1.47V) flags latched until valid charge detected - enables system-level shutdown sequencing before brownout. |
Applications
| Portable Medical Devices | Power Tools |
|---|---|
Use Scenario: Rechargeable Li-ion battery pack in handheld ultrasound or infusion pump requiring precise remaining runtime estimation under variable load and ambient temperature shifts. IC Role / Device Role / Timing Role: Fuel gauge IC performing coulomb counting, temperature-compensated self-discharge correction, and LED-based state-of-charge indication. Use Value: Enables accurate "hours remaining" display and low-battery alerts without firmware intervention - critical for clinical safety and user confidence. | Use Scenario: Cordless drill or impact driver battery pack where rapid discharge pulses and elevated operating temperatures challenge capacity tracking. IC Role / Device Role / Timing Role: Battery management subsystem component measuring current via sense resistor, compensating for high-rate discharge (≥0.5C) and thermal drift (up to 85°C). Use Value: Maintains ±2% integrated non-linearity error even at 1A discharge, preventing premature shutdown during peak torque events. |
| Laptop Battery Packs | Consumer Electronics Accessories |
Use Scenario: Multi-cell Li-ion smart battery for ultrabook with embedded controller requiring accurate cycle-life-aware capacity reporting over 300+ charge cycles. IC Role / Device Role / Timing Role: Standalone gas gauge providing NAC, LMD, and CPI registers via SMBus-compatible single-wire interface to system microcontroller. Use Value: Tracks capacity degradation via CPI counter and updates LMD only after qualified full discharges - delivers trustworthy wear-leveling data to OS battery manager. | Use Scenario: Bluetooth headset or wireless earbud case with compact Li-ion battery needing minimal PCB area (<12 in²) and ultra-low quiescent current. IC Role / Device Role / Timing Role: Integrated fuel gauge with direct LED drive and 120µA operating current - eliminates need for separate display driver or high-speed interface. Use Value: Reduces BOM count and layout complexity while delivering five-segment visual SOC feedback - ideal for space-constrained accessories. |
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 charger controller + fuel gauge; supports CC/CV charging; lacks LED segment outputs; uses different register map and communication protocol. | Targeted at in-system charging applications; not suitable for standalone battery-pack integration without charging circuitry. | Select BQ2057W only if charger control is required alongside fuel gauging; BQ2050SN-D119 remains preferred for pure capacity monitoring in pre-charged packs. |
| BQ27200 | Lower quiescent current (55µA); supports TI Impedance Track™ algorithm; requires external EEPROM; no native LED drive; 12-pin DSGBGA package. | Optimized for ultra-low-power wearable devices; requires host processor support for impedance modeling and calibration. | Choose BQ27200 for next-gen designs prioritizing sub-100µA operation and advanced chemistry modeling; BQ2050SN-D119 offers simpler integration and visual feedback out-of-box. |
Compared with BQ2057W and BQ27200, the BQ2050SN-D119 uniquely balances low-power operation, direct LED display capability, and robust temperature/rate compensation in a mature, widely deployed SOIC package - making it optimal for cost-sensitive, space-constrained battery-pack applications requiring immediate visual SOC feedback.
Availability
BQ2050SN-D119 is available at Aetrix Electronics and suitable for portable medical devices, power tools, laptop battery packs, consumer electronics accessories, and industrial handheld instruments requiring stable component supply and long-lifecycle support.
Supply support for BQ2050SN-D119 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 company headquartered in Dallas, Texas, specializing in analog, embedded processing, and power management technologies with broad industrial and automotive design-in leadership.
The BQ2050SN-D119 belongs to TI's Battery Management IC product line, engineered specifically for accurate lithium-ion fuel gauging in battery packs - emphasizing conservative capacity estimation, minimal external components, and compatibility with legacy single-wire host interfaces.
FAQ
What is the primary function of the BQ2050SN-D119?
The BQ2050SN-D119 is a lithium-ion fuel gauge IC that estimates available battery capacity using coulomb counting, temperature compensation, and self-discharge modeling. It delivers conservative, repeatable capacity readings via LED display or single-wire serial interface - with core functionality centered on maintaining accurate NAC, LMD, and DCR registers across operating conditions. The BQ2050SN-D119 does not manage charging or protection; it solely reports state-of-charge.
How does the BQ2050SN-D119 handle temperature compensation?
The BQ2050SN-D119 uses an internal temperature sensor with 10°C resolution (codes 0x–Cx) to adjust charge/discharge counting and self-discharge rates. For graphite anodes, it applies discrete compensation factors - e.g., 1.35× at –10°C to 0°C - based on Tables 3A/B. Self-discharge rate scales across eight bands (e.g., NAC512/day at 20–30°C). All temperature data is readable from register 02h. The BQ2050SN-D119 does not require external thermistors.
Can the BQ2050SN-D119 be used with multi-cell Li-ion batteries?
Yes - the BQ2050SN-D119 operates from 3.0–6.5V and can be powered directly from a single Li-ion cell (VBAT > 3V). For multi-cell packs (>1 series cell), its REF output enables a simple external transistor-based regulator. The SB pin monitors battery voltage via a resistive divider (RB1/RB2), supporting EDV threshold detection per cell. The BQ2050SN-D119 itself does not monitor individual cell voltages; it assumes balanced pack operation.
What are the key differences between the LED display mode and serial interface mode of the BQ2050SN-D119?
In LED display mode, the BQ2050SN-D119 drives SEG1–SEG5 directly using LCOM as a current sink - enabling a five-segment bar graph without host intervention. In serial mode, it communicates over DQ using a command-based protocol (≤333 bits/sec) to read/write registers like NAC (03h/17h), temperature (02h), or VSB (0Bh). Both modes operate simultaneously; DISP pin controls LED activation independently. The BQ2050SN-D119 supports either or both concurrently.
How does the BQ2050SN-D119 learn battery capacity over time?
The BQ2050SN-D119 learns capacity through the Last Measured Discharge (LMD) mechanism: when a full discharge (NAC = 0) occurs from LMD level down to EDV1, the Discharge Count Register (DCR) value transfers to LMD - becoming the new 100% reference. This "learning" requires a qualified discharge meeting criteria: no partial charges, self-discharge < 4096 counts, and EDV1 reached ≥0°C. Until then, LMD defaults to the programmed full count (PFC). The BQ2050SN-D119 does not auto-calibrate without this full-cycle event.
BQ2050SN-D119 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- Power Gauge™
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Battery Monitor
- Battery Chemistry:
- Lithium Ion
- Number of Cells:
- -
- Fault Protection:
- -
- Interface:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
BQ2050SN-D119 FAQ
1.How can I place an order for BQ2050SN-D119 through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ2050SN-D119 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 BQ2050SN-D119 reliable?
The price and inventory of BQ2050SN-D119 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ2050SN-D119 is usually 5 days.
3.What payment methods are accepted for BQ2050SN-D119?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ2050SN-D119 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ2050SN-D119?
BQ2050SN-D119 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ2050SN-D119 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 BQ2050SN-D119?
For technical support, including BQ2050SN-D119 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ2050SN-D119 requirements.
6.How does Aetrix verify that BQ2050SN-D119 is sourced from the original manufacturer or authorized distributors?
All BQ2050SN-D119 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 BQ2050SN-D119 meets industry standards.
7.What is the process for return or replacement of BQ2050SN-D119?
All BQ2050SN-D119 units undergo pre-shipment inspection (PSI). If there is an issue with BQ2050SN-D119, 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 BQ2050SN-D119 part is unused and in its original packaging.
Return procedure for BQ2050SN-D119:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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