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Analog Devices Inc. LTC2942CDCB#TRPBF
- Part No.:
- LTC2942CDCB#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Management
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LTC2942CDCB#TRPBF.pdf
- Description:
- IC BATT MON LI-ION 1CELL 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,775
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Product details
Overview
LTC2942CDCB#TRPBF from Analog Devices (formerly Linear Technology) is a precision battery gas gauge IC for single-cell Li-Ion systems, measuring accumulated charge via high-side current sensing, battery voltage with 14-bit No Latency ΔΣ ADC, and on-chip temperature with 10-bit ADC - all with ±1% charge accuracy, ±1.3% voltage error, and ±5K temperature error across 0°C to 70°C ambient.
For engineers reviewing the LTC2942CDCB#TRPBF datasheet, LTC2942CDCB#TRPBF pinout, LTC2942CDCB#TRPBF application, or LTC2942CDCB#TRPBF equivalent, key selection concerns include coulomb counter prescaler configuration for battery capacity matching, SMBus/I²C address (0x64), alert/charge-complete dual-mode AL/CC pin behavior, and ±50mV differential sense voltage compliance.
Technical Context
The LTC2942CDCB#TRPBF implements an auto-zeroed differential analog integrator for coulomb counting, with programmable prescaler M (1–128) to scale charge LSB resolution from 0.085mAh (M=128, RSENSE=50mΩ) down to sub-µAh levels. Its internal 14-bit voltage ADC and 10-bit temperature ADC share a common reference and clock, supporting automatic alternating conversion every ~2 seconds or manual single-shot mode.
Operation relies on high-side sensing between battery positive and load/charger, with SENSE+ serving as both power supply (2.7V–5.5V) and positive sense input. The AL/CC pin is configurable as open-drain SMBus alert output or logic-level charge-complete input, while undervoltage lockout (2.5V–2.7V threshold) preserves register state but suspends analog integration during brownout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Charge Accuracy | ±1% total error over ±10mV to ±50mV sense range - enables reliable state-of-charge estimation in portable Li-Ion applications. |
| Voltage Measurement | 14-bit No Latency ΔΣ ADC, ±1.3% total unadjusted error, 366.2µV LSB - supports precise battery terminal voltage monitoring without missing codes. |
| Temperature Sensing | On-die sensor with 10-bit ADC, ±5K error over –40°C to 85°C, 0.586K LSB - provides thermal context for charge management without external components. |
| Supply Range | 2.7V to 5.5V on SENSE+, compatible with single-cell Li-Ion nominal 3.0–4.2V operation and full discharge/recharge cycles. |
| Quiescent Current | 70–100µA in active gas gauge mode with ADC asleep - extends runtime in always-on battery monitoring systems. |
| I²C Address | Fixed 7-bit address 0x64 (1100100b), standard/fast mode up to 400kHz - ensures interoperability with host microcontrollers without address conflicts. |
| Sense Voltage Range | ±50mV differential (SENSE+ to SENSE–), with 400kΩ input resistance - defines maximum measurable current for given RSENSE (e.g., 100mA max with 500mΩ). |
Pinout & Package
Package: 6-lead 2mm × 3mm plastic DFN (DCB) with exposed pad (Pin 7, do not connect). RoHS-compliant, lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SENSE+ (Pin 1) | High-side current sense input & power supply | Connects to load/charger side of sense resistor; supplies device and sets operating voltage range (2.7V–5.5V). |
| GND (Pin 2) | Device ground reference | Must connect directly to battery negative terminal to maintain accurate high-side current measurement path. |
| SCL (Pin 3) | I²C/SMBus clock input | Asynchronous serial clock line; accepts 0–400kHz signals; requires external pull-up to VSENSE+. |
| SDA (Pin 4) | I²C/SMBus bidirectional data line | Open-drain interface; shares bus with other I²C slaves; requires external pull-up to VSENSE+. |
| AL/CC (Pin 5) | Configurable alert output / charge-complete input | Default: open-drain alert (pulled low on threshold breach); configurable via B[2:1] to accept high-level charge-done signal. |
| SENSE– (Pin 6) | High-side current sense return & voltage measurement node | Connects to battery positive terminal; serves as ADC input for battery voltage; must stay within ±50mV of SENSE+. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable coulomb counter prescaler | M = 1 to 128 adjusts charge LSB resolution to match battery capacity (e.g., 0.085mAh at M=128 → 0.00066mAh at M=1). |
| Dual-function AL/CC pin | Eliminates need for separate alert and charge-complete GPIOs; reduces system pin count and simplifies firmware handling. |
| No Latency ΔΣ ADC architecture | Delivers 14-bit voltage and 10-bit temperature conversions in 15ms with no pipeline delay - enables deterministic timing for real-time SoC updates. |
| Automatic voltage/temperature scan mode | Self-timed dual-conversion every ~2 seconds minimizes host polling overhead and conserves MCU resources. |
| Undervoltage lockout with register retention | Preserves accumulated charge value during brownout (SENSE+ < 2.7V), enabling resume-of-integration upon recovery without SoC recalibration. |
Applications
| Smartphone Battery Management | Wireless Headphone Fuel Gauging |
|---|---|
Use Scenario: Real-time state-of-charge tracking during active voice calls, streaming, and Bluetooth LE connection with dynamic load changes. IC Role / Device Role / Timing Role: High-side coulomb counter continuously integrates load current while voltage/temperature ADCs sample every 2 seconds to correct SoC drift. Use Value: Enables accurate battery percentage display and low-battery warnings within ±3% SoC error, extending perceived runtime through intelligent power budgeting. | Use Scenario: Compact earbud charging case monitoring its own Li-Poly battery while also gauging connected earbuds' charge status via shared I²C bus. IC Role / Device Role / Timing Role: Acts as primary gas gauge for case battery; uses AL/CC pin in charge-complete mode to reset accumulated charge when earbuds report full charge. Use Value: Eliminates need for secondary fuel gauge IC in earbud PCB, reducing BOM cost and footprint while maintaining ±1% charge accuracy across 100–500mAh capacities. |
| Portable Medical Monitor Power | GPS Tracker Battery Telemetry |
Use Scenario: Continuous ECG and SpO₂ monitoring in handheld clinical devices requiring >24-hour runtime and regulatory-grade battery reporting. IC Role / Device Role / Timing Role: Measures charge flow into/out of medical-grade Li-Ion cell; triggers alerts via AL/CC pin if voltage drops below 3.0V or temperature exceeds 45°C. Use Value: Supports FDA-aligned battery health logging by storing timestamped voltage/temperature/charge registers accessible via I²C for audit trail generation. | Use Scenario: Solar-powered asset tracker transmitting location every 15 minutes, where battery longevity depends on precise low-current discharge modeling. IC Role / Device Role / Timing Role: Integrates µA-level sleep current over days using M=128 prescaler; performs periodic voltage checks to detect aging-induced capacity loss. Use Value: Extends field life from 18 to >36 months by detecting 15% capacity degradation early, enabling proactive battery replacement before mission failure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery gas gauge applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ27426YZFT | Integrated battery authentication, 3.5% typical charge error, 12-bit voltage ADC, TI proprietary Impedance Track algorithm | Requires TI-specific firmware stack; optimized for embedded chem-id identification rather than raw coulomb counting | Select for systems needing secure battery authentication or OEM battery pack compatibility |
| MAX17048G+T | ModelGauge m3 algorithm, 1% typical charge error, 16-bit voltage ADC, built-in temperature compensation | Uses adaptive impedance modeling instead of fixed ADC + integrator; higher computational overhead on host | Select when battery chemistry varies across production lots and model-based SoC correction is preferred |
Compared with BQ27426YZFT and MAX17048G+T, the LTC2942CDCB#TRPBF delivers deterministic coulomb integration with minimal host dependency, making it ideal for resource-constrained MCUs where firmware simplicity and guaranteed worst-case error bounds are prioritized over adaptive modeling.
Availability
LTC2942CDCB#TRPBF is available at Aetrix Electronics and suitable for smartphone battery management, wireless headphone fuel gauging, portable medical monitor power, GPS tracker battery telemetry, and solar-powered IoT sensor nodes requiring stable component supply and long-term industrial availability.
Supply support for LTC2942CDCB#TRPBF 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
Analog Devices, Inc. (ADI) is a global semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and power management.
The LTC2942CDCB#TRPBF belongs to ADI's legacy Linear Technology battery management product line, designed specifically for high-accuracy, low-power, single-cell Li-Ion gas gauging in space- and cost-constrained portable electronics.
FAQ
What is the operating temperature range for the LTC2942CDCB#TRPBF?
The LTC2942CDCB#TRPBF is specified for 0°C to 70°C ambient operation (C-grade). This range matches commercial portable electronics requirements and is validated per the Absolute Maximum Ratings table, where TJMAX = 150°C and θJA = 120°C/W ensure safe thermal performance in 2mm × 3mm DFN packages under typical PCB layouts.
How does the LTC2942CDCB#TRPBF handle battery voltage measurement during charging?
The LTC2942CDCB#TRPBF measures voltage at the SENSE– pin, which connects directly to the battery's positive terminal. During charging, this provides true battery terminal voltage regardless of load current or sense resistor drop - enabling accurate end-of-charge detection and preventing overvoltage conditions even when high-side current flows into the cell.
Can the LTC2942CDCB#TRPBF be used with multi-cell battery packs?
No - the LTC2942CDCB#TRPBF is explicitly designed for single-cell Li-Ion/Li-Poly systems with 2.7V–5.5V supply range. Its ±50mV sense voltage limit, 6V full-scale ADC, and internal temperature sensor calibration assume a single-cell topology; using it with 2S or higher configurations violates absolute maximum ratings and invalidates charge accuracy specifications.
What is the minimum sense resistor value supported by the LTC2942CDCB#TRPBF?
The LTC2942CDCB#TRPBF does not specify a minimum RSENSE value, but practical lower limits arise from noise and offset. With ±10µV typical input offset and 400kΩ input resistance, RSENSE < 10mΩ yields <1µA sense current at ±50mV - approaching noise floor. Recommended minimum is 20mΩ for robust 1% accuracy, verified in Typical Performance Characteristics plots showing <±0.5% error down to 20mΩ at 100mA.
Does the LTC2942CDCB#TRPBF support SMBus Alert Response Protocol?
Yes - the LTC2942CDCB#TRPBF implements full SMBus Alert Response Protocol on the AL/CC pin when configured in alert mode (B[2:1] = [10]). Upon threshold violation, it pulls AL/CC low and holds until the host executes an Alert Response Address (ARA) transaction, after which the status register bits clear and AL/CC returns high-impedance - ensuring interoperability with standard SMBus controllers.
LTC2942CDCB#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 6-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Last Time Buy
- Function:
- Battery Monitor
- Battery Chemistry:
- Lithium Ion
- Number of Cells:
- 1
- Fault Protection:
- -
- Interface:
- I2C
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-DFN (2x3)
LTC2942CDCB#TRPBF FAQ
1.How can I place an order for LTC2942CDCB#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2942CDCB#TRPBF 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 LTC2942CDCB#TRPBF reliable?
The price and inventory of LTC2942CDCB#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2942CDCB#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2942CDCB#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2942CDCB#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2942CDCB#TRPBF?
LTC2942CDCB#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2942CDCB#TRPBF 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 LTC2942CDCB#TRPBF?
For technical support, including LTC2942CDCB#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2942CDCB#TRPBF requirements.
6.How does Aetrix verify that LTC2942CDCB#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2942CDCB#TRPBF 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 LTC2942CDCB#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2942CDCB#TRPBF?
All LTC2942CDCB#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2942CDCB#TRPBF, 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 LTC2942CDCB#TRPBF part is unused and in its original packaging.
Return procedure for LTC2942CDCB#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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