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Analog Devices Inc. LTC2945CMS#TRPBF
- Part No.:
- LTC2945CMS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Power Supply Controllers, Monitors
- Package:
- 12-TSSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC2945CMS#TRPBF.pdf
- Description:
- IC POWER MONITOR I2C 12-MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,838
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Product details
Overview
LTC2945CMS#TRPBF from Analog Devices is a rail-to-rail I²C power monitor IC that measures current (via shunt voltage), input supply voltage (0V–80V), and calculates 24-bit power in real time. It integrates a 12-bit ΔΣ ADC with ±0.75% total unadjusted error, stores min/max values per channel, and asserts ALERT on threshold violation. Used in telecom DC/DC monitoring, automotive battery management, and industrial 48V systems.
For engineers reviewing the LTC2945CMS#TRPBF datasheet, LTC2945CMS#TRPBF pinout, LTC2945CMS#TRPBF application, or LTC2945CMS#TRPBF equivalent, key selection criteria include its 0V–80V common-mode sense range, split SDAI/SDAO for opto-isolated I²C, onboard 24-bit power calculation, and MSOP-12 package compatibility with space-constrained high-voltage rails.
Technical Context
The LTC2945CMS#TRPBF implements a dedicated 12-bit delta-sigma ADC with three sequential measurement channels: differential shunt voltage (ΔSENSE, 102.4mV FS, 25µV LSB), supply voltage (VDD or SENSE+, 102.4V FS, 25mV LSB), and auxiliary ADIN (2.048V FS, 0.5mV LSB). It performs real-time digital multiplication to generate 24-bit power data without host CPU intervention.
Its dual-supply architecture supports flexible powering: INTVCC can be driven externally (2.7V–5.9V), regulated from VDD (4V–80V → 5V), or configured as a 6.3V shunt regulator for >80V supplies. The I²C interface uses separate SDAI (input) and SDAO (output) pins to enable galvanic isolation without external logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Rail-to-rail sense range | 0V to 80V common-mode - enables direct high-side or low-side current sensing across full battery/supply voltage range without level-shifting. |
| ADC resolution & accuracy | 12-bit ΔΣ with ±0.75% total unadjusted error - ensures reliable current/voltage quantization even under noisy industrial conditions. |
| Power calculation | On-chip 24-bit digital multiplication of current × voltage - eliminates host MCU computation overhead and timing uncertainty. |
| I²C interface | Split SDAI/SDAO + nine address options (ADR0/ADR1) - supports opto-isolation and multi-device bus addressing without external buffers. |
| Supply flexibility | VDD = 4V–80V; INTVCC = 2.7V–5.9V (input), 5V (regulator output), or 6.3V (shunt mode) - accommodates legacy 5V systems, 48V telecom, and >80V HV applications. |
| Alert & storage | Programmable over/under thresholds + min/max registers per channel - reduces polling frequency and enables autonomous fault detection. |
| Shutdown current | <80 µA IQ - preserves battery life in always-on monitoring nodes such as automotive ECU power supervisors. |
Pinout & Package
Package: 12-lead MSOP (3.0mm × 4.0mm, 0.65mm pitch), RoHS-compliant, rated for 0°C to 70°C (C-grade).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | High-voltage supply input | Accepts 4V–80V; powers internal series regulator to generate INTVCC; bypass capacitor required. |
| INTVCC | Internal low-voltage supply | Configurable as 5V regulator output (from VDD), 2.7V–5.9V external input, or 6.3V shunt regulator node. |
| SENSE+ | Current sense and voltage monitor input | Measures supply voltage (102.4V FS) and serves as high-side shunt terminal; Kelvin connection recommended. |
| SENSE– | Current sense reference input | Differential input for shunt voltage (102.4mV FS); forms ΔSENSE with SENSE+; supports rail-to-rail 0V–80V operation. |
| ADIN | Auxiliary analog input | Monitors external voltage (0–2.048V FS); used for temperature sensor output, reference voltage, or secondary rail. |
| GND | Device ground reference | System return path for ADC, logic, and internal regulators; must be low-impedance for accurate sensing. |
| SCL | I²C clock input | Open-collector input; requires external pull-up; internally clamped to 6.4V max; supports up to 400kHz. |
| SDAI | I²C data input | Master-to-slave data line; open-collector; pull-up required; clamp-limited to 6.4V; enables isolated bus via optocoupler. |
| SDAO | I²C data output | Slave-to-master data/ACK line; open-drain; pull-up required; inverted version (LTC2945-1) available for specific isolators. |
| ALERT | Open-drain fault indicator | Pulled low when programmed thresholds exceeded; SMBus-alert compatible; requires pull-up resistor. |
| ADR0 / ADR1 | I²C address configuration | Three-state inputs (INTVCC/GND/open) set one of nine unique slave addresses; enables multi-device I²C networks. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail 0V–80V sense capability | Enables direct high-side or low-side current monitoring on batteries, 48V servers, and automotive 12V/24V/48V rails without external level shifters. |
| On-chip 24-bit power calculation | Eliminates need for host MCU to perform current × voltage multiplication, reducing firmware complexity and latency in power budgeting. |
| Split SDAI/SDAO I²C interface | Allows seamless integration with opto-isolators (e.g., PC817, TLP2361) without external logic gates or direction control signals. |
| Min/max value tracking per channel | Reduces host polling frequency and enables post-fault analysis of peak load conditions without continuous register reads. |
| Shunt regulator mode for >80V supplies | Supports operation from >80V sources (e.g., -48V telecom, 100V EV subsystems) using external RSHUNT, avoiding external DC/DC converters. |
| Low-power shutdown (<80 µA) | Extends battery runtime in portable test equipment and always-on vehicle subsystems where periodic wake-up suffices. |
Applications
| Telecom DC/DC Monitoring | Automotive Battery Management |
|---|---|
Use Scenario: Real-time monitoring of -48V telecom rectifier outputs and intermediate 12V/5V distribution rails. IC Role / Device Role / Timing Role: Measures shunt current, input voltage, and computes power delivered to downstream converters; alerts on overcurrent or undervoltage. Use Value: Enables predictive maintenance by logging min/max power cycles and detecting gradual efficiency degradation before failure. |
Use Scenario: Supervising 12V starter battery and 48V mild-hybrid system voltage/current during engine start-stop and regenerative braking. IC Role / Device Role / Timing Role: High-side current sensing on battery feed with rail-to-rail 0V–80V common-mode range; stores peak discharge current for diagnostics. Use Value: Provides accurate Coulomb counting and state-of-health estimation without adding layout complexity from isolated amplifiers. |
| Industrial 48V Power Distribution | Server Rack Power Budgeting |
Use Scenario: Monitoring individual 48V server PSU outputs feeding GPU/CPU VRMs in data center racks. IC Role / Device Role / Timing Role: Measures per-rail current and voltage; calculates real-time power; triggers ALERT on over-power events exceeding thermal limits. Use Value: Enables dynamic power capping and load balancing across redundant PSUs using only I²C telemetry-no additional ADC or FPGA resources needed. |
Use Scenario: Tracking power consumption of hot-swappable compute modules in modular server chassis. IC Role / Device Role / Timing Role: Mounted on each module's PCB to measure local VDD and shunt current; reports via shared I²C bus with unique ADR0/ADR1 address. Use Value: Delivers granular, rack-level power telemetry at sub-watt resolution without requiring centralized power metering hardware. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar power monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA226AIDGST | 36V max common-mode; no onboard power calculation; 16-bit ADC; no shunt regulator mode. | Limited to ≤36V systems; requires host MCU for power math; lacks >80V support and min/max storage. | Select when higher ADC resolution is prioritized over voltage range and autonomous power computation. |
| LTC2946IMS#PBF | Same pinout/package; adds EEPROM for calibration storage; improved TUE (±0.5%); supports 100V sense range. | Direct upgrade path with enhanced accuracy and nonvolatile configuration retention; same footprint and software interface. | Choose for new designs requiring long-term calibration stability and extended 0V–100V monitoring capability. |
Compared with INA226AIDGST, LTC2945CMS#TRPBF delivers wider voltage range and autonomous power calculation but trades off ADC resolution; versus LTC2946IMS#PBF, it offers cost-optimized C-grade performance without EEPROM, making it ideal for volume telecom and industrial applications where field recalibration is not required.
Availability
LTC2945CMS#TRPBF is available at Aetrix Electronics and suitable for telecom infrastructure, automotive battery supervision, and industrial 48V power distribution requiring stable component supply and long-term production continuity.
Supply support for LTC2945CMS#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. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, and communications markets.
The LTC2945 belongs to Analog Devices' system power monitoring product line, designed specifically for accurate, autonomous, and isolated current/voltage/power measurement in high-voltage, noise-sensitive environments.
FAQ
What is the maximum common-mode voltage the LTC2945CMS#TRPBF can measure?
The LTC2945CMS#TRPBF supports a rail-to-rail input common-mode range of 0V to 80V on its SENSE+ and SENSE– pins. This allows direct high-side or low-side current sensing across full battery or supply voltages without external level-shifting circuitry. Absolute maximum ratings extend to 100V, but specified operation remains within 0V–80V for guaranteed accuracy and functionality.
Does the LTC2945CMS#TRPBF require an external microcontroller to calculate power?
No. The LTC2945CMS#TRPBF performs real-time 24-bit digital multiplication of measured current and voltage internally. It outputs ready-to-read power values via its I²C interface, eliminating the need for host MCU computation and associated firmware overhead or timing uncertainty in power budgeting applications.
Can the LTC2945CMS#TRPBF operate from a supply voltage above 80V?
Yes. When VDD exceeds 80V, the LTC2945CMS#TRPBF can use its INTVCC pin in shunt regulator mode (6.3V clamp), powered through an external current-limiting resistor. This enables operation from >80V sources like -48V telecom systems or 100V EV subsystems without requiring an external DC/DC converter.
How does the split SDAI/SDAO interface benefit isolated I²C designs?
The LTC2945CMS#TRPBF separates I²C data input (SDAI) and output (SDAO) onto distinct pins, allowing direct connection to standard opto-isolators (e.g., PC817) without external logic or direction control. This simplifies isolated bus implementation, reduces component count, and avoids timing skew issues inherent in bidirectional isolated SDA lines.
What is the function of the ADR0 and ADR1 pins on the LTC2945CMS#TRPBF?
The ADR0 and ADR1 pins on the LTC2945CMS#TRPBF are three-state address configuration inputs. By connecting each to INTVCC, GND, or leaving open, they select one of nine unique I²C slave addresses-enabling up to nine LTC2945CMS#TRPBF devices on the same bus without address conflicts or external address jumpers.
LTC2945CMS#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-TSSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Applications:
- General Purpose
- Voltage - Input:
- 4V ~ 80V
- Voltage - Supply:
- 2.7V ~ 5.9V
- Current - Supply:
- 800 µA
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-MSOP
LTC2945CMS#TRPBF FAQ
1.How can I place an order for LTC2945CMS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2945CMS#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 LTC2945CMS#TRPBF reliable?
The price and inventory of LTC2945CMS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2945CMS#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2945CMS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2945CMS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2945CMS#TRPBF?
LTC2945CMS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2945CMS#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 LTC2945CMS#TRPBF?
For technical support, including LTC2945CMS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2945CMS#TRPBF requirements.
6.How does Aetrix verify that LTC2945CMS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2945CMS#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 LTC2945CMS#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2945CMS#TRPBF?
All LTC2945CMS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2945CMS#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 LTC2945CMS#TRPBF part is unused and in its original packaging.
Return procedure for LTC2945CMS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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