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Texas Instruments BQ2011SN-D118
- Part No.:
- BQ2011SN-D118
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
BQ2011SN-D118.pdf
- Description:
- IC GAS GAUGE NIC CAD 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,869
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Product details
Overview
BQ2011SN-D118 from Texas Instruments is a gas gauge IC designed for high-discharge-rate battery packs in power tools, monitoring charge/discharge via sense-resistor voltage drop (VSR), compensating for temperature (−35°C to +85°C) and rate, and estimating self-discharge using internal timer and temperature sensor. It supports absolute/relative LED capacity display and single-wire serial communication.
For engineers reviewing the BQ2011SN-D118 datasheet, BQ2011SN-D118 pinout, BQ2011SN-D118 application, or BQ2011SN-D118 equivalent, key selection criteria include its 16-pin narrow SOIC package, 120µA standby current, VSR-based current sensing with ±2% INL error, PFC-programmable full-count scaling, and EDV/ MCV voltage thresholds (0.90V / 2.00V) for battery protection.
Technical Context
The BQ2011SN-D118 implements coulomb counting with dual compensation: temperature-adapted charge/discharge efficiency factors (e.g., fast-charge compensation 0.95 at <40°C) and 8-step self-discharge rate scaling (NAC/320 to NAC/2 per day across −30°C to >70°C). It uses an internal 10°C-step temperature sensor (TMPGG register) and monitors VSR relative to VSS to distinguish charge (VSR < VSS) and discharge (VSR > VSS).
Its operational architecture includes three core counters-Nominal Available Charge (NAC), Last Measured Discharge (LMD), and Discharge Count Register (DCR)-with qualified transfer logic ensuring LMD updates only after full discharge to EDV under defined conditions (temperature ≥0°C, self-discharge ≤4096 counts, no intervening valid charges). The DQ pin implements an asynchronous return-to-one serial protocol at ≤333 bits/sec.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.0–6.5V - supports direct operation from 4-cell NiCd/NiMH packs (4.8V nominal); REF output enables external regulator for >4 cells. |
| Standby Current | 120µA typical - enables low-power self-discharge estimation mode without significant battery drain. |
| VSR Sensing Range | ±400µV to ±400mV - defines valid charge (VSRO < −400µV) and discharge (VSRO > 500µV) detection thresholds; digital filter rejects counts between −400µV and 500µV. |
| Temperature Range | −35°C to +85°C - measured in 10°C steps (TMPGG register) and used to scale charge/discharge efficiency and self-discharge rate. |
| EDV / MCV Thresholds | 0.90V / 2.00V - fixed single-cell voltage thresholds for end-of-discharge warning and overvoltage fault detection. |
| Serial Interface | Single-wire open-drain DQ - asynchronous return-to-one protocol, LSB-first, ≤333 bits/sec; supports host read/write of registers including NAC, TMPGG, and FLGS1. |
| LED Drive | SEG1–SEG5 outputs with MODE pin control - enables five-segment graphical capacity display in absolute (fixed PFC reference) or relative (LMD-based) mode. |
Pinout & Package
Package: 16-pin narrow SOIC (5.3mm × 10.2mm, 1.27mm pitch).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply input | Accepts 3.0–6.5V; powers internal circuitry and can be sourced directly from 4-cell battery or regulated via REF. |
| REF | Voltage reference output | Provides stable reference for external micro-regulator when operating from >4 cells. |
| NC | No-connect terminal | Must remain unconnected; no internal connection or function. |
| DQ | Serial data I/O | Open-drain bidirectional pin for command/data exchange with host processor; requires external pull-up if used. |
| RBI | Register backup input | Connects to storage capacitor to retain register state during VCC dropout below 3.0V. |
| SB | Single-cell battery monitor | High-impedance input for resistor-divider network to detect EDV (0.90V) and MCV (2.00V) thresholds. |
| DISP | Display enable control | Float enables continuous LED display during charge/discharge; driven low activates display for 4±0.5 seconds. |
| SR | Sense resistor input | Low-side connection to sense resistor; measures VSR for coulomb counting; layout requires strict single-point ground. |
| MODE | Display mode selector | Floating selects relative mode (LMD reference); connected to LED anode selects absolute mode (PFC reference). |
| SEG1–SEG5 | LED segment drivers | Active-low outputs sinking current from MODE/VCC/battery; drive five-segment capacity indicator. |
| PFC | Programmed full count input | Three-level input (H/Z/L) selecting PFC value (e.g., 34304 counts = 6.5mVh) defining initial capacity and absolute display scale. |
| VSS | Negative battery terminal | System ground reference; SR and VSS form differential sensing pair with critical layout constraints. |
Key Features
| Feature | Design Value |
|---|---|
| Self-discharge estimation | Temperature-compensated algorithm using internal timer and 10°C-step sensor; rate scales from NAC/320/day (<10°C) to NAC/2/day (>70°C). |
| Charge/discharge compensation | Dynamic adjustment of efficiency factors based on real-time VSR magnitude and temperature; e.g., discharge factor increases to 1.25 at VSR > 150mV and decreases by 0.05 per 10°C step below 10°C. |
| Capacity learning | Automatically updates Last Measured Discharge (LMD) only after qualified full discharge to EDV, ensuring accurate "learned" capacity independent of charger type. |
| Robust current sensing | Integrated non-linearity error ±2% typical; digital filtering rejects noise between −400µV and 500µV; offset voltage (VOS) minimized via strict PCB single-point ground layout. |
| Flexible display interface | Direct LED drive with MODE-selectable absolute/relative mode and DISP-triggered momentary display, eliminating need for external display controller. |
Applications
| Power Tools Battery Packs | Medical Portable Devices |
|---|---|
Use Scenario: Cordless drills, impact drivers, and saws requiring precise remaining runtime estimation under high-pulse discharge (up to 80A). IC Role / Device Role / Timing Role: Gas gauge IC performing real-time coulomb counting with rate/temperature compensation to maintain accurate NAC during rapid load transients. Use Value: Prevents unexpected shutdown by triggering EDV warning at 0.90V/cell and enabling five-segment LED display calibrated to actual learned capacity (LMD), not nominal rating. | Use Scenario: Handheld ultrasound scanners and infusion pumps needing reliable battery status during intermittent high-current operation. IC Role / Device Role / Timing Role: Battery management subsystem element providing self-discharge-corrected available charge (NAC) and temperature-aware capacity reporting via serial interface. Use Value: Extends usable runtime by compensating for self-discharge at elevated temperatures (e.g., +40°C), where rate doubles to NAC/40 per day versus NAC/80 at 25°C. |
| Two-Way Radio Battery Packs | Industrial Test Equipment |
Use Scenario: Tactical radios with burst-transmit duty cycles causing high peak discharge currents and variable thermal profiles. IC Role / Device Role / Timing Role: Primary gas gauge IC monitoring VSR across low-value sense resistor while applying dynamic discharge compensation factors (1.00–1.25) based on instantaneous VSR level. Use Value: Maintains accuracy across wide operating range (−20°C to +60°C) by adapting charge/discharge efficiency using three temperature bands and eight self-discharge steps. | Use Scenario: Portable multimeters and oscilloscopes requiring stable battery readout during calibration sequences and measurement bursts. IC Role / Device Role / Timing Role: Embedded fuel gauge providing NAC and temperature (TMPGG) data over single-wire serial link to host MCU for UI display and low-battery alerts. Use Value: Enables push-button display activation (via DISP) for on-demand capacity check without continuous power draw, leveraging 120µA standby current. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar gas gauge applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ2013SN | Same 16-pin SOIC package and core architecture but adds EEPROM for permanent parameter storage; higher standby current (200µA vs. 120µA). | Required where factory-programmed PFC, LMD, or battery ID must persist across battery swaps or long-term storage. | Select BQ2013SN if non-volatile register retention is mandatory; BQ2011SN-D118 suffices for cost-sensitive designs using RBI capacitor for volatile backup. |
| BQ2019SN | Includes integrated 5V LDO regulator and enhanced ESD protection; supports wider VCC range (2.7–6.5V); same PFC programming and LED display functionality. | Suitable for battery packs lacking external regulation or exposed to harsh ESD environments (e.g., industrial handhelds). | Choose BQ2019SN when board space constraints eliminate need for discrete regulator or when IEC 61000-4-2 Level 4 compliance is required. |
Compared with BQ2011SN-D118, BQ2013SN trades lower standby power for non-volatile memory, while BQ2019SN adds integrated regulation and ESD robustness at the cost of slightly higher quiescent current-both retain identical gas gauge algorithms and LED interface behavior.
Availability
BQ2011SN-D118 is available at Aetrix Electronics and suitable for power tools, medical portables, two-way radios, and industrial test equipment requiring stable component supply, precise high-rate battery gauging, and LED-based capacity indication.
Supply support for BQ2011SN-D118 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 broad industrial and automotive portfolio coverage.
The BQ2011SN-D118 belongs to TI's battery management IC product line, engineered specifically for high-discharge-rate rechargeable battery packs in portable power equipment where accuracy under dynamic load and temperature variation is critical.
FAQ
What is the primary function of the BQ2011SN-D118 in a battery pack?
The BQ2011SN-D118 serves as a gas gauge IC that accurately tracks available battery charge using coulomb counting across a sense resistor, applying real-time temperature and discharge-rate compensation to maintain precision in high-pulse applications like power tools. Its core function is to compute and report Nominal Available Charge (NAC) while supporting LED display and serial host communication-making the BQ2011SN-D118 essential for runtime estimation and low-battery warnings.
How does the BQ2011SN-D118 handle battery self-discharge compensation?
The BQ2011SN-D118 estimates self-discharge using an internal timer and its integrated temperature sensor, scaling the daily rate across eight 10°C bands-from NAC/320 per day below 10°C up to NAC/2 per day above 70°C. This temperature-adaptive algorithm ensures the NAC register decrements realistically during storage, preventing overestimation of remaining capacity. Because self-discharge compensation is fully embedded, no external components or host intervention are needed for the BQ2011SN-D118 to maintain accuracy during idle periods.
What are the valid voltage thresholds monitored by the BQ2011SN-D118 on the SB pin?
The BQ2011SN-D118 monitors the SB pin for two fixed single-cell voltage thresholds: end-of-discharge voltage (EDV) at 0.90V and maximum cell voltage (MCV) at 2.00V. EDV triggers the low-battery warning (blinking SEG1) and latches until a valid charge is detected; MCV indicates overvoltage fault during charging and remains asserted until the condition clears. These thresholds are hard-coded and not user-adjustable, ensuring consistent protection behavior across all BQ2011SN-D118 units without calibration.
Can the BQ2011SN-D118 operate directly from a 6-cell NiCd battery pack?
Yes, the BQ2011SN-D118 can operate from a 6-cell NiCd pack (nominal 7.2V, max ~9V) when used with an external regulator built around the REF output and an external transistor (e.g., ZVNL110A), as shown in Figure 1 of the datasheet. Direct connection to >4 cells without regulation exceeds the 6.5V VCC absolute maximum and risks damage. The BQ2011SN-D118's REF pin provides a stable reference to construct this low-cost regulator-enabling safe, scalable operation beyond its native 4-cell limit.
How is the full-scale capacity (PFC) programmed on the BQ2011SN-D118?
The full-scale capacity (PFC) on the BQ2011SN-D118 is set by the logic state (H, Z, or L) applied to the PFC pin at power-on reset, selecting one of six pre-defined mVh values (e.g., 34304 counts = 6.5mVh) from Table 1. This value determines both the initial capacity reference and the absolute LED display scale. The correct PFC is calculated as battery capacity (mAh) × sense resistor (Ω); for example, a 1300mAh battery with 0.005Ω sense resistor requires PFC = 6.5mVh, corresponding to the Z-state selection on the BQ2011SN-D118.
BQ2011SN-D118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Function:
- Battery Monitor
- Battery Chemistry:
- Nickel Cadmium
- Number of Cells:
- -
- Fault Protection:
- -
- Interface:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
BQ2011SN-D118 FAQ
1.How can I place an order for BQ2011SN-D118 through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ2011SN-D118 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 BQ2011SN-D118 reliable?
The price and inventory of BQ2011SN-D118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ2011SN-D118 is usually 5 days.
3.What payment methods are accepted for BQ2011SN-D118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ2011SN-D118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ2011SN-D118?
BQ2011SN-D118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ2011SN-D118 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 BQ2011SN-D118?
For technical support, including BQ2011SN-D118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ2011SN-D118 requirements.
6.How does Aetrix verify that BQ2011SN-D118 is sourced from the original manufacturer or authorized distributors?
All BQ2011SN-D118 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 BQ2011SN-D118 meets industry standards.
7.What is the process for return or replacement of BQ2011SN-D118?
All BQ2011SN-D118 units undergo pre-shipment inspection (PSI). If there is an issue with BQ2011SN-D118, 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 BQ2011SN-D118 part is unused and in its original packaging.
Return procedure for BQ2011SN-D118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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