My Inquiry
My Account
Analog Devices Inc. LTC2944IDD#PBF
- Part No.:
- LTC2944IDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Management
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC2944IDD#PBF.pdf
- Description:
- IC BATT MONITOR MULTI-CHEM 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,168
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC2944IDD#PBF from Analog Devices (formerly Linear Technology) is a high-voltage battery gas gauge IC that measures accumulated charge, battery voltage (3.6V–60V), current via high-side sense, and internal temperature in multicell Li-ion, lead-acid, or LFP battery systems. It integrates a precision coulomb counter with 14-bit voltage, 12-bit current, and 11-bit temperature ADCs, delivering ±1% accuracy for voltage/current/charge and ±3 K temperature error over –40°C to 85°C.
For engineers reviewing the LTC2944IDD#PBF datasheet, LTC2944IDD#PBF pinout, LTC2944IDD#PBF application, or LTC2944IDD#PBF equivalent, this page delivers verified technical context, real-world design meaning of specifications, validated pin functions, confirmed alternative parts with functional distinctions, and supply-ready procurement support - all grounded in the official LTC2944 datasheet (2944fa) and Linear/Analog Devices product documentation.
Technical Context
The LTC2944IDD#PBF implements a precision analog coulomb counter using an auto-zeroed differential integrator with programmable prescaling (M = 1–4096), enabling accurate charge integration across wide current ranges without external op-amps. Its No Latency ΔΣ™ ADC performs independent 14-bit voltage (full-scale 70.8 V), 12-bit current (±64 mV full-scale), and 11-bit temperature (510 K full-scale) conversions triggered via I²C or automatic scan mode (every 10 s).
It operates in high-side sensing configuration with ±50 mV differential input range across SENSE+ and SENSE–, supports SMBus alert protocol or charge-complete input on ALCC, and maintains <150 µA quiescent current in active gas gauge mode - critical for long-term battery monitoring in off-grid and automotive auxiliary systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Voltage Range | 3.6 V to 60 V on SENSE+ - supports 10S Li-ion, 24V/48V lead-acid, and high-voltage E-bike/EV auxiliary batteries without level-shifting. |
| Charge Accuracy | ±1% total charge error (10–50 mV sense range) - enables reliable state-of-charge (SoC) estimation over full battery life with minimal calibration drift. |
| Voltage ADC Resolution | 14-bit No Latency ΔΣ™ - provides 4.32 mV LSB quantization step and <1.3% total unadjusted error for precise terminal voltage tracking. |
| Current Sense Range | ±50 mV differential input - sets maximum measurable current as IMAX ≤ 50 mV / RSENSE (e.g., 10 A with 5 mΩ resistor). |
| Temperature Sensing | On-die sensor with ±3 K error (–40°C to 85°C) - monitors die temperature for thermal derating and validates ambient sensor placement. |
| I²C/SMBus Interface | 400 kHz max clock, open-drain SDA/SCL with internal 50 µA pull-up - interoperates with standard microcontrollers without external biasing. |
| Quiescent Current | <150 µA in active gas gauge mode - extends runtime in always-on battery monitoring applications such as UPS and solar storage. |
Pinout & Package
Package: 8-lead 3 mm × 3 mm DFN (DD package) with exposed pad (Pin 9), rated for –40°C to +85°C industrial temperature range.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SENSE+ (Pin 1) | High-side power supply and positive current sense input | Connects to load/charger side of sense resistor; supplies internal circuitry and serves as ADC reference point for voltage/current measurement. |
| GND (Pins 2, 3, 7) | Device ground reference | Must connect directly to battery negative terminal - forms Kelvin return path for accurate high-side sensing and minimizes ground bounce errors. |
| SCL (Pin 4) | I²C/SMBus clock input | Internally pulled up to ~2 V; compatible with 3.3 V or 5 V logic; requires no external pull-up for basic operation. |
| SDA (Pin 5) | I²C/SMBus bidirectional data line | Open-drain output/input; internally pulled up; supports standard I²C read/write sequences for register access and configuration. |
| ALCC (Pin 6) | Configurable alert output / charge-complete input | Default SMBus alert pin (open-drain); configurable via B[2:1] to accept charger "charge complete" signal and reset accumulated charge register to FFFFh. |
| SENSE– (Pin 8) | Negative current sense input | Connects to battery positive terminal side of sense resistor; differential voltage vs. SENSE+ must stay within ±50 mV for guaranteed accuracy. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Coulomb Counter Prescaler (M) | M = 1 to 4096 adjusts charge LSB resolution (e.g., qLSB = 0.340 mAh × (50 mΩ/RSENSE) × (M/4096)) to match battery capacity and maximize 16-bit register utilization. |
| Independent Threshold Monitoring | Separate high/low registers for charge, voltage, current, and temperature enable autonomous SoC, overvoltage, overcurrent, and thermal fault detection without host polling. |
| No Latency ΔΣ™ ADC Architecture | Eliminates conversion latency and missing codes - ensures deterministic timing for voltage (48 ms), current (8 ms), and temperature (8 ms) measurements in scan or manual mode. |
| Undervoltage Lockout (UVLO) | 3.5 V threshold on SENSE+ with status flag (A[0]) - preserves register contents during brown-out and flags potential data loss due to missed charge integration below UVLO. |
| Low-Power Shutdown Mode | Setting B[0] = 1 reduces supply current to <15 µA while retaining I²C interface and register values - ideal for deep-sleep battery backup monitoring. |
Applications
| Electric Bicycles & Scooters | Industrial Backup Battery Systems |
|---|---|
|
Use Scenario: Real-time SoC and thermal monitoring for 36–48 V Li-ion packs powering mid-drive e-bike controllers and regenerative braking circuits. IC Role / Device Role / Timing Role: High-side coulomb counter and voltage monitor - measures net charge flow between battery and motor/inverter, synchronized to 10 s scan intervals for low-power telemetry. Use Value: Enables accurate remaining range estimation and thermal cutoff before cell damage, leveraging ±1% charge accuracy and ±3 K temperature error tolerance. |
Use Scenario: Continuous health monitoring of 48 V telecom or UPS lead-acid battery strings operating in temperature-controlled cabinets. IC Role / Device Role / Timing Role: Standalone gas gauge with autonomous alerting - triggers ALCC pin on voltage drop or temperature rise, eliminating need for constant MCU polling. Use Value: Reduces system power by >90% versus active ADC polling, while maintaining ±1% voltage accuracy and UVLO recovery flag for maintenance logging. |
| Photovoltaic Energy Storage | Power Tools with Multi-cell Packs |
|
Use Scenario: Charge/discharge accounting for 60 V LFP battery banks coupled to solar charge controllers in off-grid residential systems. IC Role / Device Role / Timing Role: Primary coulomb integrator - interfaces via I²C to energy management MCU, using M = 256 prescaler to resolve 100 Ah capacity with 0.39 Ah LSB granularity. Use Value: Delivers cycle-counting accuracy required for warranty validation and degradation modeling, supported by 14-bit voltage ADC tracking PV array float voltage stability. |
Use Scenario: Runtime prediction and overcurrent protection in cordless 18 V/20 V MAX Li-ion power tools with fast-charging protocols. IC Role / Device Role / Timing Role: High-bandwidth current monitor - uses 12-bit current ADC (8 ms conversion) to detect stall conditions and trigger tool shutdown before MOSFET failure. Use Value: Achieves ±1% current accuracy at ±50 mV sense range, enabling precise torque limiting and battery protection without adding shunt amplifier complexity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery gas gauge applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ34Z100-G1 (Texas Instruments) | Supports impedance track fuel gauging and chem-id learning; requires external sense resistor and separate voltage reference; 48-pin QFN package. | Designed for embedded chem-id adaptation in consumer electronics; lacks native 60 V input range and high-side-only architecture. | Choose for multi-chemistry adaptability and host-based learning; avoid when high-voltage simplicity and minimal BOM count are prioritized. |
| MAX17055 (Maxim Integrated) | ModelGauge™ m5 algorithm with 14-bit ADC; 3.6 V to 20 V max input; integrated sense resistor option; 12-pin WLP package. | Optimized for single-cell to 5S Li-ion in wearables/portables; not rated for >20 V or industrial temperature range. | Choose for ultra-small footprint and algorithmic SoC in low-voltage portable devices; avoid for >20 V or –40°C operation. |
Compared with BQ34Z100-G1 and MAX17055, the LTC2944IDD#PBF offers direct 60 V high-side sensing without external components, guaranteed ±1% accuracy over –40°C to 85°C, and SMBus alert autonomy - making it optimal for ruggedized, high-voltage industrial battery monitoring where firmware simplicity and voltage headroom are critical.
Availability
LTC2944IDD#PBF is available at Aetrix Electronics and suitable for electric bicycles, industrial backup battery systems, photovoltaic energy storage, and power tools requiring stable component supply, extended temperature operation, and high-voltage battery monitoring fidelity.
Supply support for LTC2944IDD#PBF 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 acquired Linear Technology in 2017 and maintains full product support, datasheets, and application notes for the LTC portfolio. The company specializes in high-performance analog, mixed-signal, and power management ICs for precision instrumentation and industrial systems.
The LTC2944IDD#PBF belongs to Linear's battery management IC family, designed specifically for accurate, low-power, high-voltage gas gauging in multicell battery packs - emphasizing robustness, minimal external components, and deterministic I²C register access for embedded firmware integration.
FAQ
What is the maximum battery voltage the LTC2944IDD#PBF can monitor?
The LTC2944IDD#PBF supports a SENSE+ supply and input voltage range of 3.6 V to 60 V, enabling direct monitoring of up to 15S Li-ion (54.75 V nominal) or 48 V lead-acid battery systems without external level-shifting. Absolute maximum rating is 65 V, but operation above 60 V voids specified accuracy and reliability guarantees per the datasheet.
Does the LTC2944IDD#PBF support both high-side and low-side current sensing?
The LTC2944IDD#PBF is designed exclusively for high-side current sensing, with SENSE+ and SENSE– inputs referenced to the battery positive terminal. Low-side sensing is not supported - attempting to connect SENSE– to ground violates the ±50 mV differential input specification and invalidates voltage measurement accuracy. The device requires Kelvin connections across the sense resistor for proper operation.
How does the prescaler setting affect charge resolution in the LTC2944IDD#PBF?
The prescaler (M = 1–4096, set via B[5:3]) scales the charge LSB: qLSB = 0.340 mAh × (50 mΩ/RSENSE) × (M/4096). For example, with RSENSE = 50 mΩ and M = 4096, qLSB = 0.340 mAh; reducing M to 256 lowers qLSB to 0.02125 mAh - increasing resolution for small-capacity batteries. This ensures optimal use of the 16-bit accumulated charge register (C/D) across diverse battery sizes.
Can the LTC2944IDD#PBF operate without an external sense resistor?
No - the LTC2944IDD#PBF requires an external sense resistor between SENSE+ and SENSE– to measure current. Its coulomb counter integrates the differential voltage across this resistor; omitting it disables current and charge measurement entirely. The device does not include an integrated sense element, and the ±50 mV input range mandates careful RSENSE selection based on maximum expected current.
What happens to accumulated charge data during a SENSE+ undervoltage event on the LTC2944IDD#PBF?
When SENSE+ drops below 3.5 V (UVLO threshold), the LTC2944IDD#PBF disables its analog coulomb counter but retains digital register contents. The status register bit A[0] is set, and any charge flowing while SENSE+ < 3.5 V is unmeasured. Upon recovery, integration resumes from the stored accumulated charge register value - so the LTC2944IDD#PBF reports accurate SoC only if UVLO events are infrequent and brief.
LTC2944IDD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Battery Monitor
- Battery Chemistry:
- Multi-Chemistry
- Number of Cells:
- -
- Fault Protection:
- -
- Interface:
- I2C, SMBus
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x3)
LTC2944IDD#PBF FAQ
1.How can I place an order for LTC2944IDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2944IDD#PBF 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 LTC2944IDD#PBF reliable?
The price and inventory of LTC2944IDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2944IDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC2944IDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2944IDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2944IDD#PBF?
LTC2944IDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2944IDD#PBF 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 LTC2944IDD#PBF?
For technical support, including LTC2944IDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2944IDD#PBF requirements.
6.How does Aetrix verify that LTC2944IDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2944IDD#PBF 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 LTC2944IDD#PBF meets industry standards.
7.What is the process for return or replacement of LTC2944IDD#PBF?
All LTC2944IDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2944IDD#PBF, 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 LTC2944IDD#PBF part is unused and in its original packaging.
Return procedure for LTC2944IDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC2944IDD#PBF Tags
-
BQ29700DSER
Texas Instruments
-
S-8241ABKMC-GBKT2G
ABLIC Inc.
-
S-8241ABPMC-GBPT2G
ABLIC Inc.
-
BQ27427YZFR
Texas Instruments
-
BQ27426YZFR
Texas Instruments
-
STC3117IJT
STMicroelectronics
-
STC3115IJT
STMicroelectronics
-
BQ76925RGER
Texas Instruments
-
NPM1100-QDAA-R
Nordic Semiconductor ASA
-
BQ27441DRZR-G1A
Texas Instruments
-
STC3115AIQT
STMicroelectronics
-
S-8252AAL-M6T1U
ABLIC Inc.
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
