Analog Devices Inc. LTC2992HMS#PBF

Overview

LTC2992HMS#PBF from Analog Devices is a dual wide-range rail-to-rail power monitor IC that measures current, voltage, and power of two independent supplies (0V–100V common-mode), featuring 12-bit ADCs with ±0.3% total unadjusted error, integrated shunt regulator for >100V supplies, and I²C interface with split SDAI/SDAO pins for opto-isolation support - deployed in telecom rectifier monitoring and industrial 48V DC distribution systems.

For engineers reviewing the LTC2992HMS#PBF datasheet, LTC2992HMS#PBF pinout, LTC2992HMS#PBF application, or LTC2992HMS#PBF equivalent, key selection criteria include its dual-supply 0V–100V measurement range, 16-lead MSOP package with –40°C to +125°C operation, programmable alert thresholds, minimum/maximum value storage, and simultaneous current/voltage/power computation without host CPU polling.

Technical Context

The LTC2992HMS#PBF integrates three delta-sigma ADCs: two dedicated 12-bit current-sense ADCs (full-scale ΔSENSE = 51.2 mV) and one 12-bit voltage ADC (full-scale 102.4 V on SENSE+ inputs, 2.048 V on GPIO inputs). It supports continuous scan and snapshot modes, stores min/max values per channel, and computes real-time power (P = V × I) and total system consumption (I_TOTAL, P_TOTAL) via on-chip digital multiplication.

Its flexible power architecture allows direct operation from 2.7V–100V VDD, internal 5V LDO regulation at INTVCC (up to 10 mA), or shunt-regulated 6.2V mode for >100V supplies. The I²C interface includes separate SDAI (input) and SDAO (output) pins, enabling galvanic isolation without external logic inversion - unlike the LTC2992-1 variant which provides inverted SDAO.

Key Specifications

Pinout & Package

Package: 16-lead plastic MSOP (4.0 mm × 3.0 mm × 1.1 mm), exposed pad optional for thermal enhancement. Pin count and physical layout match industry-standard MSOP-16 footprint.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-supply power monitoring applications.

Compared with INA226AIDGST and LTC2991IMS#PBF, the LTC2992HMS#PBF uniquely delivers dual-rail power computation, on-chip min/max history, and opto-isolation-ready I²C in a single H-grade MSOP package - reducing system-level complexity for 48V+ infrastructure where space, thermal margin, and isolation are critical.

Availability

LTC2992HMS#PBF is available at Aetrix Electronics and suitable for telecom rectifier monitoring, industrial 48V DC distribution, and automotive dual-battery systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LTC2992HMS#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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, communications, and automotive markets.

The LTC2992 product line delivers highly integrated, wide-range power monitoring solutions designed specifically for high-reliability infrastructure applications where supply voltages exceed 36V and ambient temperatures reach +125°C.

FAQ

What is the maximum common-mode voltage the LTC2992HMS#PBF can measure on SENSE1+ and SENSE2+ inputs?

The LTC2992HMS#PBF supports a 0V to 100V input common-mode range on both SENSE1+ and SENSE2+ pins. This allows direct high-side or low-side monitoring of industrial 48V, telecom -48V, and automotive 12V/48V rails without external level-shifting circuitry. Absolute maximum rating extends to 100V, and operation remains specified across the full –40°C to +125°C temperature range for the H-grade device.

Does the LTC2992HMS#PBF require external calibration for accurate current measurements?

The LTC2992HMS#PBF performs automatic offset calibration of its current-sense amplifiers during each conversion cycle by default. This eliminates the need for external calibration components or factory-trimmed references. Users may reduce calibration frequency via the CTRLA[7] bit to extend conversion throughput, though initial calibration at power-up remains mandatory. No external zero-current adjustment is required for production use.

Can the LTC2992HMS#PBF operate from a 3.3V supply, or does it require a higher VDD?

The LTC2992HMS#PBF can operate from a 3.3V supply applied to the VDD pin, but only if INTVCC is externally powered with 2.7V–5.8V. When VDD < 8V, the internal LDO is disabled and INTVCC must be supplied externally. For standalone operation, VDD must be ≥8V to enable the 5V LDO output. The datasheet specifies VDD = 3V minimum only when INTVCC is externally driven.

How does the LTC2992HMS#PBF handle power calculation when using different shunt resistors on SENSE1 and SENSE2?

The LTC2992HMS#PBF computes power as P = V × I, where I is derived from ΔSENSE voltage and known shunt resistance (R_SHUNT). Since the device reports raw ADC codes and full-scale values (51.2 mV), users must apply R_SHUNT-specific scaling in firmware. The on-chip multiplier uses uncalibrated digital values; therefore, mismatched shunts require post-processing to maintain accuracy - the LTC2992HMS#PBF itself does not store or compensate for differing R_SHUNT values.

Is the LTC2992HMS#PBF pin-compatible with the LTC2992HDE#PBF?

Yes, the LTC2992HMS#PBF (MSOP-16) and LTC2992HDE#PBF (DFN-16) share identical pin functions and electrical specifications, including –40°C to +125°C operation. However, they differ in package type (MSOP vs. 4mm × 3mm DFN), thermal performance (θ_JA = 120°C/W vs. 43°C/W), and PCB layout requirements. No schematic changes are needed, but thermal vias and copper area must be adapted for the DFN variant.