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Analog Devices Inc. LTC2991CMS#TRPBF
- Part No.:
- LTC2991CMS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Thermal Management
- Package:
- 16-TFSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC2991CMS#TRPBF.pdf
- Description:
- IC MONITOR OCTAL 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:8,686
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Product details
Overview
LTC2991CMS#TRPBF from Analog Devices (formerly Linear Technology) is an octal I²C voltage, current, and temperature monitor IC designed for system-level health monitoring in power management, FPGA/ASIC thermal supervision, and multi-rail supply validation. It integrates a 14-bit ADC, internal 10 ppm/°C reference, eight analog inputs (V1–V8), and supports differential current sensing, four remote diode temperature measurements, and internal die temperature sensing - delivering ±0.05% VIN TUE, ±0.7°C remote TUE (typ), and 0.0625°C resolution.
For engineers reviewing the LTC2991CMS#TRPBF datasheet, LTC2991CMS#TRPBF pinout, LTC2991CMS#TRPBF application, or LTC2991CMS#TRPBF equivalent, this device serves as a single-chip solution for sub-millivolt voltage monitoring, 1% current measurement accuracy, and high-precision remote diode temperature acquisition across industrial, telecom, and embedded computing platforms.
Technical Context
The LTC2991CMS#TRPBF implements a time-multiplexed 14-bit successive-approximation ADC with programmable input routing via internal MUX, supporting simultaneous configuration of single-ended voltage, differential current-sense, and remote diode temperature modes on paired inputs (V1/V2, V3/V4, V5/V6, V7/V8). Its control logic enforces fixed acquisition order (V1→V2→…→V8→TINT→VCC) and embeds series-resistance cancellation algorithms for remote diode measurements using dual-current sourcing.
It operates over 2.9V to 5.5V supply, features eight I²C slave addresses selectable via ADR0–ADR2 pins, and includes integrated undervoltage lockout (UVLO) at 2.0V (typ). The PWM output provides CMOS-level duty-cycle-modulated temperature feedback (32°C full-scale range) derived from V7/V8 remote diode channel, while internal temperature sensing achieves ±1°C total unadjusted error over 0°C to 70°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.9V to 5.5V - compatible with 3.3V and 5V logic domains; requires 0.1µF decoupling at VCC |
| ADC Resolution | 14-bit - guarantees monotonicity and no missing codes; enables 305.18 µV LSB for single-ended voltage |
| Remote Temp Accuracy | ±0.7°C (typ), ±1.5°C (max) - specified for η = 1.004 diodes; includes series resistance cancellation |
| Voltage Measurement TUE | ±0.05% (typ) - applies to V1–V8 and VCC inputs across full common-mode range (0V to VCC) |
| Differential Full-Scale Range | ±312.5 mV - supports current sense resistors down to ~60 mΩ for ±5A full-scale measurement |
| I²C Interface Speed | Up to 400 kHz fast mode - compliant with standard I²C timing; no clock stretching implemented |
| Operating Temperature | 0°C to 70°C - defined by C-grade specification; junction max = 125°C, θJA = 120°C/W |
Pinout & Package
16-lead plastic MSOP package (3mm × 4.9mm, 0.65mm pitch), thermally enhanced with exposed pad (not electrically connected); RoHS-compliant, lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V1–V8 (Pins 1–8) | Configurable analog inputs | Support single-ended voltage (0–4.9V), differential current-sense (±312.5mV), or remote diode bias (V1/V3/V5/V7 source 260–350µA; V2/V4/V6/V8 internally terminated) |
| GND (Pin 9) | Analog/digital ground reference | Low-impedance connection required; separates noise-sensitive analog paths from digital return currents |
| SDA (Pin 10) | I²C bidirectional data line | Open-drain output; requires external pull-up to VCC; supports read/write register access and status polling |
| SCL (Pin 11) | I²C clock input | Slave-only interface; accepts 100kHz standard or 400kHz fast mode clocks; no clock stretching |
| PWM (Pin 12) | Temperature-proportional output | CMOS-level duty cycle (0–99.8%) scaled to 32°C range; derived exclusively from V7/V8 remote diode channel |
| ADR0–ADR2 (Pins 13–15) | I²C address select inputs | Binary-encoded address bits; set low/high to select one of eight possible 7-bit slave addresses (0x48–0x4F) |
| VCC (Pin 16) | Power supply input | 2.9–5.5V operation; internal UVLO asserts below 2.0V (typ); decoupling capacitor mandatory |
Key Features
| Feature | Design Value |
|---|---|
| Octal input monitoring with flexible pairing | V1–V8 configurable per channel as single-ended, differential, or remote diode - enables concurrent voltage, current, and up to four temperature measurements |
| Integrated 10 ppm/°C voltage reference | Eliminates external reference IC and reduces BOM count; ensures stable ADC gain across temperature without calibration |
| Series resistance cancellation | Proprietary algorithm compensates for PCB trace and sensor bond wire resistance in remote diode measurements - maintains ±0.7°C accuracy despite up to kΩ-level parasitics |
| ESD-hardened analog inputs | V1–V8 rated to 6kV HBM - protects against handling and system-level ESD events without external TVS diodes |
| Programmable I²C addressing | Eight unique addresses via ADR0–ADR2 - allows multiple LTC2991CMS#TRPBF devices on same bus without address conflict |
Applications
| Server Power Rail Monitoring | FPGA Thermal Management |
|---|---|
Use Scenario: Real-time tracking of 12V/5V/3.3V/1.2V supply rails and VRM output stability in rack-mounted servers. IC Role / Device Role / Timing Role: LTC2991CMS#TRPBF acts as centralized analog front-end, performing sequential 14-bit voltage sampling with <1.8ms per channel and reporting via I²C to BMC. Use Value: Enables detection of <±5mV rail deviations and correlation with thermal events; eliminates need for discrete ADCs and reference circuits per rail. |
Use Scenario: Continuous thermal supervision of Xilinx Kintex/UltraScale FPGA die and adjacent power components using on-die PNP transistors. IC Role / Device Role / Timing Role: LTC2991CMS#TRPBF configures V1/V2 and V3/V4 as remote diode channels, sourcing precision bias currents and applying series-resistance cancellation. Use Value: Achieves ±0.7°C remote TUE without external compensation circuitry; PWM output directly drives fan speed control loop. |
| Industrial PLC I/O Module | Optical Transceiver Line Card |
Use Scenario: Monitoring of isolated 24V field power, 5V logic supplies, and current through motor driver outputs in programmable logic controllers. IC Role / Device Role / Timing Role: LTC2991CMS#TRPBF pairs V5/V6 across shunt resistor for 1% accurate current measurement and uses V7/V8 for ambient temperature reference. Use Value: Provides single-chip validation of both power integrity and thermal derating margins; supports predictive maintenance via trend analysis of V/I/T correlations. |
Use Scenario: Compact thermal and bias voltage monitoring inside SFP28/QSFP-DD optical modules where board space is constrained. IC Role / Device Role / Timing Role: LTC2991CMS#TRPBF measures TEC driver voltage (V1), laser bias current (V3/V4 differential), and laser diode temperature (V7/V8 remote diode). Use Value: Delivers 0.0625°C resolution and ±0.05% voltage accuracy in 16-pin MSOP - meets GR-468 reliability requirements without sacrificing measurement fidelity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage, current, and temperature monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX31865ATJ+T | RTD-specific 24-bit delta-sigma ADC; no voltage/current monitoring; supports only Pt100/Pt1000 sensors | Targeted at high-accuracy industrial RTD temperature systems - not suitable for mixed-signal monitoring | Select only when primary requirement is platinum RTD interface with <0.1°C accuracy; incompatible with diode-based or voltage/current sensing |
| INA226AIDGST | Dedicated 16-bit current/voltage/power monitor; no temperature sensing; supports only shunt-based current measurement | Optimized for high-side current sensing in DC-DC converters and battery management - lacks thermal capability | Choose when system requires >16-bit current resolution and power calculation (P = V×I), but thermal monitoring is handled separately |
Compared with MAX31865ATJ+T and INA226AIDGST, the LTC2991CMS#TRPBF uniquely integrates voltage, current, and multi-channel temperature sensing in one 16-pin device - eliminating inter-IC synchronization overhead, reducing PCB area by >40%, and enabling correlated health analytics across all three domains without external signal conditioning.
Availability
LTC2991CMS#TRPBF is available at Aetrix Electronics and suitable for server power rail monitoring, FPGA thermal management, industrial PLC I/O modules, optical transceiver line cards, and embedded computing platforms requiring stable component supply with guaranteed long-term manufacturability.
Supply support for LTC2991CMS#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 leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, acquired Linear Technology in 2017 to strengthen its precision signal chain portfolio.
The LTC2991CMS#TRPBF belongs to ADI's Linear Technology legacy precision monitoring product line, engineered specifically for high-accuracy, multi-parameter system health telemetry in space-constrained, thermally demanding environments.
FAQ
What is the operating temperature range of the LTC2991CMS#TRPBF?
The LTC2991CMS#TRPBF is specified for 0°C to 70°C ambient operation (C-grade), with junction temperature limited to 125°C. Its internal temperature sensor exhibits ±1°C total unadjusted error across this range, and remote diode measurements maintain ±0.7°C typical accuracy. Thermal performance is validated with θJA = 120°C/W under standard JEDEC 2-layer board conditions.
How does the LTC2991CMS#TRPBF perform remote diode temperature measurements?
The LTC2991CMS#TRPBF performs remote diode temperature measurements by sourcing precise 260–350µA bias current from V1/V3/V5/V7 pins into NPN/PNP transistors (e.g., MMBT3904 or FPGA-embedded diodes), while terminating V2/V4/V6/V8 with internal switches. It digitizes diode voltage with 38.15µV LSB resolution and applies proprietary series-resistance cancellation to deliver ±0.7°C accuracy even with parasitic trace resistance.
Can the LTC2991CMS#TRPBF measure current, and what is its accuracy?
Yes, the LTC2991CMS#TRPBF measures current via differential voltage across an external sense resistor using paired inputs (e.g., V1–V2, V3–V4). With a full-scale differential range of ±312.5mV and 14-bit resolution, it achieves 1% measurement accuracy. For optimal results, Kelvin (4-wire) connections to the shunt and source impedance <50Ω are recommended to limit gain error to <½ LSB.
What I²C addresses does the LTC2991CMS#TRPBF support?
The LTC2991CMS#TRPBF supports eight I²C slave addresses (0x48–0x4F) selected via the binary combination of ADR0, ADR1, and ADR2 pins (each tied high or low). All addresses are 7-bit, and the device operates in standard (100kHz) and fast (400kHz) I²C modes. No clock stretching is implemented, and SDA/SCL inputs meet standard I²C voltage thresholds (VIL = 0.3×VCC, VIH = 0.7×VCC).
Does the LTC2991CMS#TRPBF require external components for basic operation?
Yes - the LTC2991CMS#TRPBF requires a 0.1µF ceramic decoupling capacitor between VCC and GND, external pull-up resistors on SDA and SCL lines (typically 2.2kΩ to VCC), and optional RC filtering on analog inputs for noise-sensitive applications. No external reference, op-amps, or current sources are needed due to its integrated 10 ppm/°C reference and programmable bias current sources for remote diode sensing.
LTC2991CMS#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TFSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Temp Monitoring System (Sensor)
- Sensor Type:
- Internal and External
- Sensing Temperature:
- -
- Accuracy:
- ±3.5°C Local(Max), ±1.5°C Remote(Max)
- Topology:
- ADC, Multiplexer, Register Bank
- Output Type:
- I2C
- Output Alarm:
- Yes
- Output Fan:
- Yes
- Voltage - Supply:
- 2.9V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP
LTC2991CMS#TRPBF FAQ
1.How can I place an order for LTC2991CMS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2991CMS#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 LTC2991CMS#TRPBF reliable?
The price and inventory of LTC2991CMS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2991CMS#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2991CMS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2991CMS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2991CMS#TRPBF?
LTC2991CMS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2991CMS#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 LTC2991CMS#TRPBF?
For technical support, including LTC2991CMS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2991CMS#TRPBF requirements.
6.How does Aetrix verify that LTC2991CMS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2991CMS#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 LTC2991CMS#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2991CMS#TRPBF?
All LTC2991CMS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2991CMS#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 LTC2991CMS#TRPBF part is unused and in its original packaging.
Return procedure for LTC2991CMS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC2991CMS#TRPBF Tags
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EMC2101-ACZL-TR
Microchip Technology
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MCP9844T-BE/MNY
Microchip Technology
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EMC2101-R-ACZL-TR
Microchip Technology
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MCP98244T-BE/MNY
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TC670ECHTR
Microchip Technology
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SE98ATP,547
NXP Semiconductors
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AMC6821SDBQR
Texas Instruments
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MAX6604AATA+T
Analog Devices Inc./Maxim Integrated
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ADT7475ARQZ-REEL
onsemi
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MAX6643LBBAEE+
Analog Devices Inc./Maxim Integrated
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MAX6684ESA+T
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MAX6639AEE+
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