My Inquiry
My Account
Analog Devices Inc. LTC2944CDD#TRPBF
- Part No.:
- LTC2944CDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Management
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC2944CDD#TRPBF.pdf
- Description:
- IC BATT MONITOR MULTI-CHEM 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,807
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC2944CDD#TRPBF from Analog Devices (formerly Linear Technology) is a 60V high-side battery gas gauge IC that measures accumulated charge, battery voltage (3.6V–60V), current via ±50mV differential sense, and die temperature using integrated 14-bit (voltage), 12-bit (current), and 11-bit (temperature) No Latency ΔΣ ADCs. It delivers 1% accuracy across all three measurements and supports SMBus/I²C interface for embedded battery monitoring in electric vehicles and power tools.
For engineers reviewing the LTC2944CDD#TRPBF datasheet, LTC2944CDD#TRPBF pinout, LTC2944CDD#TRPBF application, or LTC2944CDD#TRPBF equivalent, key selection criteria include high-side sensing capability, ±50mV sense range, 1% total unadjusted error, 150µA max quiescent current, and programmable alert thresholds for charge/voltage/current/temperature - all in an 8-lead 3mm × 3mm DFN package.
Technical Context
The LTC2944CDD#TRPBF implements a precision analog coulomb counter with auto-zeroed differential integrator architecture, enabling accurate charge integration without digital post-processing. Its internal prescaler (M = 1 to 4096) scales resolution to match battery capacity and sense resistor value.
It integrates three independent measurement paths: a 14-bit voltage ADC referenced to SENSE– (full-scale 70.8V), a 12-bit current ADC measuring VSENSE+–VSENSE– (±64mV full-scale), and an 11-bit on-die temperature sensor (510K full-scale, ±3K total unadjusted error). All conversions are triggered via I²C control register B[7:6] in manual, scan (10s interval), or automatic mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Voltage Range | 3.6V to 60V on SENSE+ pin - supports 10-cell Li-ion up to 42V nominal or lead-acid stacks. |
| Voltage Measurement Accuracy | ±1% total unadjusted error - enables reliable state-of-charge estimation without calibration. |
| Current Sense Range | ±50mV differential input - sets maximum measurable current as IMAX = 50mV/RSENSE. |
| Charge Resolution | qLSB = 0.340mAh × (50mΩ/RSENSE) × (M/4096) - configurable LSB from µAh to mAh via RSENSE and prescaler M. |
| Quiescent Current | <150µA in active mode, <30µA in shutdown - extends runtime in always-on battery monitoring systems. |
| I²C Interface Speed | Up to 900kHz clock frequency - supports fast register reads during dynamic load transitions. |
| Temperature Sensing | On-die sensor with ±3K error (–40°C to 85°C) - monitors IC self-heating to prevent thermal drift in coulomb counting. |
Pinout & Package
Package: 8-lead 3mm × 3mm plastic DFN (DD package) with exposed pad (Pin 9), rated for 0°C to 70°C ambient operation.
| 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 current measurement. |
| GND (Pins 2, 3, 7) | Device ground | Must connect directly to battery negative terminal; multiple pins reduce ground path impedance and improve noise immunity. |
| SCL (Pin 4) | I²C/SMBus clock input | Internally pulled up to ~2V; compatible with 3.3V or 5V bus logic levels when VSENSE+ ≥ 5V. |
| SDA (Pin 5) | I²C/SMBus bidirectional data line | Open-drain output with internal pull-up; requires external pull-up resistor for bus communication. |
| ALCC (Pin 6) | Configurable alert output / charge-complete input | Default SMBus alert output (open-drain); reconfigurable via control register B[2:1] to accept charger's "charge complete" signal. |
| SENSE– (Pin 8) | Negative current sense input | Connects to battery positive terminal side of sense resistor; voltage must stay within ±50mV of SENSE+ for guaranteed accuracy. |
Key Features
| Feature | Design Value |
|---|---|
| High-side coulomb counting | Enables direct integration between battery positive and load/charger without ground disruption or shunt relocation. |
| Programmable alert thresholds | Independent high/low limits per parameter (charge, voltage, current, temperature) stored in I²C-accessible registers. |
| No Latency ΔΣ ADC architecture | Guarantees no missing codes across 14-bit (voltage), 12-bit (current), and 11-bit (temperature) conversions. |
| Auto-zeroed analog integrator | Reduces offset drift impact on long-term charge accumulation, maintaining <1% total charge error over time. |
| Configurable prescaler (M = 1–4096) | Allows qLSB scaling to match battery capacity - avoids ACR overflow in low-current/high-capacity or underutilization in high-current/low-capacity systems. |
Applications
| Electric Vehicles (EVs) | Power Tools |
|---|---|
|
Use Scenario: Monitoring state-of-charge and health of 48V/60V Li-ion battery packs in e-bikes, scooters, and light EVs. IC Role / Device Role / Timing Role: High-side gas gauge performing real-time coulomb counting, voltage tracking, and temperature compensation at system level. Use Value: Enables accurate remaining runtime estimation and overvoltage/overcurrent protection without modifying battery pack grounding scheme. |
Use Scenario: Battery fuel gauging in cordless drills and impact drivers with 18V–40V multicell packs. IC Role / Device Role / Timing Role: Primary charge monitor interfacing with MCU via I²C to report accumulated discharge and thermal derating status. Use Value: Delivers 1% voltage/current accuracy and <150µA quiescent current to extend tool standby life while supporting fast-charging detection via ALCC pin. |
| Photovoltaic (PV) Backup Systems | Industrial Portable Equipment |
|
Use Scenario: Supervising deep-cycle lead-acid or LiFePO₄ batteries in off-grid solar storage with wide input voltage swing (3.6V–60V). IC Role / Device Role / Timing Role: Standalone battery monitor providing voltage, current, and temperature telemetry to energy management controller. Use Value: Supports ±50mV sense range and programmable thresholds to detect float voltage deviations and thermal runaway precursors. |
Use Scenario: Fuel gauging in ruggedized medical or test equipment powered by hot-swappable 24V–48V battery modules. IC Role / Device Role / Timing Role: Integrated gas gauge with SMBus alert signaling for host MCU-initiated diagnostics and battery swap notifications. Use Value: Provides traceable charge history and configurable alerts to meet IEC 62368-1 safety requirements for portable industrial devices. |
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 chemistry modeling; requires external sense resistor and separate voltage reference; 16-bit resolution but no guaranteed no-missing-codes spec. | Targeted at chemically adaptive gauging (Li-ion, NiMH, lead-acid); includes learning algorithms for capacity prediction. | Choose for multi-chemistry support and predictive SoH; avoid if high-side-only layout or minimal firmware overhead is required. |
| MAX17050 (Maxim Integrated) | ModelGauge m5 algorithm-based; 14-bit ADC with ±0.5% voltage accuracy; operates up to 36V; uses coulomb counting + model-based correction. | Optimized for single-cell to 4S Li-ion; lacks native 60V range and high-side sensing architecture. | Choose for compact Li-ion packs ≤36V where model-based SoC improves accuracy; not suitable for 48V+ or high-side-only topologies. |
Compared with BQ34Z100-G1 and MAX17050, the LTC2944CDD#TRPBF offers deterministic high-side coulomb counting without model dependency, guaranteed 1% accuracy across voltage/current/charge, and native 60V operation - making it optimal for fixed-chemistry, high-voltage industrial battery monitoring where algorithmic complexity must be minimized.
Availability
LTC2944CDD#TRPBF is available at Aetrix Electronics and suitable for electric vehicle battery management, power tool fuel gauging, and photovoltaic backup systems requiring stable component supply, long-lifecycle assurance, and RoHS-compliant packaging.
Supply support for LTC2944CDD#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 acquired Linear Technology in 2017 and maintains its precision analog portfolio, including high-performance power management and signal conditioning ICs for industrial, automotive, and communications markets.
The LTC2944CDD#TRPBF belongs to Linear's battery monitoring product line, designed specifically for high-voltage, high-accuracy, high-side coulomb counting in portable and motive battery systems - emphasizing simplicity, robustness, and minimal external component count.
FAQ
What is the maximum operating voltage for the LTC2944CDD#TRPBF?
The LTC2944CDD#TRPBF supports a supply voltage range of 3.6V to 60V on the SENSE+ pin, enabling direct monitoring of multicell Li-ion (up to 14S), lead-acid, or LiFePO₄ battery stacks. Absolute maximum rating is 65V, but operation above 60V voids specified performance guarantees. The device remains functional up to 60V with full 1% voltage accuracy and stable coulomb counting.
Does the LTC2944CDD#TRPBF support low-side current sensing?
No, the LTC2944CDD#TRPBF is designed exclusively for high-side current sensing. Its SENSE+ and SENSE– inputs are referenced to the battery positive rail, and the internal ADC architecture assumes the sense resistor is placed between battery positive and load/charger. Low-side placement would violate the common-mode voltage specification and invalidate the ±50mV differential input range guarantee.
How does the prescaler setting affect charge resolution in the LTC2944CDD#TRPBF?
The prescaler (M = 1 to 4096) directly scales the charge LSB: qLSB = 0.340mAh × (50mΩ/RSENSE) × (M/4096). Lower M values reduce qLSB, increasing resolution for small-capacity batteries; higher M preserves resolution for large capacities. For example, with RSENSE = 50mΩ, M = 64 yields qLSB = 5.313µAh - matching a 100mAh battery to ~18,800 LSBs instead of just 294 with default M = 4096.
Can the ALCC pin on the LTC2944CDD#TRPBF serve both alert and charge-complete functions simultaneously?
No - the ALCC pin on the LTC2944CDD#TRPBF is strictly dual-function but mutually exclusive. Bits B[2:1] in the control register configure it as either SMBus alert output (default [10]), charge-complete input ([01]), or disabled ([00]). Setting B[2:1] = [11] is prohibited and may cause undefined behavior. Simultaneous use violates the internal logic and is not supported by the silicon design.
What is the temperature range qualification for the LTC2944CDD#TRPBF?
The LTC2944CDD#TRPBF is characterized for 0°C to 70°C ambient operation (C-grade). Its internal temperature sensor provides ±3K total unadjusted error across this range, and all electrical specifications - including 1% voltage/current accuracy and ±50mV sense range - are guaranteed within these limits. For extended industrial use (–40°C to 85°C), the I-grade variant LTC2944IDD#TRPBF is required.
LTC2944CDD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Battery Monitor
- Battery Chemistry:
- Multi-Chemistry
- Number of Cells:
- -
- Fault Protection:
- -
- Interface:
- I2C, SMBus
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x3)
LTC2944CDD#TRPBF FAQ
1.How can I place an order for LTC2944CDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2944CDD#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 LTC2944CDD#TRPBF reliable?
The price and inventory of LTC2944CDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2944CDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2944CDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2944CDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2944CDD#TRPBF?
LTC2944CDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2944CDD#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 LTC2944CDD#TRPBF?
For technical support, including LTC2944CDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2944CDD#TRPBF requirements.
6.How does Aetrix verify that LTC2944CDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2944CDD#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 LTC2944CDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2944CDD#TRPBF?
All LTC2944CDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2944CDD#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 LTC2944CDD#TRPBF part is unused and in its original packaging.
Return procedure for LTC2944CDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC2944CDD#TRPBF 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…
