Analog Devices Inc. LTC2992IDE-1#PBF

Overview

LTC2992IDE-1#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) with simultaneous 8-/12-bit ADCs. It features an internal shunt regulator for >100V supply support, programmable overrange alerts, min/max value storage, and I²C interface with split SDAI/SDAO pins. Used in telecom infrastructure for real-time high-side power telemetry on +48V and +12V backplane rails.

For engineers reviewing the LTC2992IDE-1#PBF datasheet, LTC2992IDE-1#PBF pinout, LTC2992IDE-1#PBF application, or LTC2992IDE-1#PBF equivalent, key selection criteria include its inverted SDAO output for opto-isolated I²C, –40°C to +85°C industrial temperature grade, 16-lead DFN package, and dual-supply power calculation capability without external µP intervention.

Technical Context

The LTC2992IDE-1#PBF implements three delta-sigma ADCs: two dedicated to differential current sense inputs (∆SENSE1/2, full-scale 51.2 mV), and one multiplexed voltage ADC (VADC) supporting six inputs-SENSE1+, SENSE2+, and GPIO1–GPIO4-with full-scale ranges of 102.4 V and 2.048 V respectively. Its internal architecture digitally multiplies synchronized current and voltage samples to compute real-time power (P = V × I) per channel and total system power.

Unlike the standard LTC2992, the -1 variant provides an inverted SDAO output signal optimized for direct connection to inverting opto-isolators, eliminating external logic inversion. It retains identical pinout, electrical specs, and register map but requires external pull-up on SDAO and cannot operate in non-isolated I²C configurations without level-shifting circuitry.

Key Specifications

Pinout & Package

Package: 16-lead (4 mm × 3 mm) plastic DFN with optional exposed pad (Pin 17) for thermal enhancement. RoHS-compliant, lead-free finish.

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 LTC2992IDE-1#PBF uniquely delivers true dual-rail correlation, 0V–100V common-mode tolerance, inverted SDAO for opto-isolation, and on-chip power summation - making it the only option meeting full requirements for telecom shelf and industrial dual-rail telemetry.

Availability

LTC2992IDE-1#PBF is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, and automotive ADAS domain controllers requiring stable component supply across extended temperature and high-voltage operating conditions.

Supply support for LTC2992IDE-1#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 industrial, automotive, communications, and healthcare markets.

The LTC2992 product line delivers integrated dual-rail power monitoring for high-reliability systems where wide common-mode range, isolation-ready interfaces, and autonomous power computation are critical - targeting telecom, industrial automation, and transportation electronics.

FAQ

What distinguishes LTC2992IDE-1#PBF from the standard LTC2992?

The LTC2992IDE-1#PBF features an inverted SDAO output signal specifically designed for direct interface with inverting opto-isolators (e.g., HCPL-0723), eliminating the need for external logic inverters. All other specifications-including pinout, register map, ADC performance, temperature grade (–40°C to +85°C), and DFN package-are identical to the base LTC2992. The -1 variant cannot be used in non-isolated I²C systems without additional level-shifting circuitry.

Does LTC2992IDE-1#PBF support high-side current sensing on a 100V rail?

Yes. The LTC2992IDE-1#PBF supports true high-side current sensing with 0V to 100V common-mode input range on SENSE1+ and SENSE2+. When paired with a low-value shunt resistor (e.g., 1 mΩ), it accurately measures load current while simultaneously monitoring rail voltage - all within a single IC without external op-amps or dividers. Its internal current sense amplifiers have 40× gain and 51.2 mV full-scale differential input range.

How does LTC2992IDE-1#PBF compute total system power?

The LTC2992IDE-1#PBF computes total system power by digitally multiplying synchronized voltage and current samples: P1 = V1 × I1 and P2 = V2 × I2. These per-rail power values are then summed in hardware to generate total power (P_TOTAL = P1 + P2). The result is stored in dedicated registers and updated continuously in continuous scan mode - no host µP involvement is required for basic power summation.

Can LTC2992IDE-1#PBF operate from a 3.3V supply?

No. The LTC2992IDE-1#PBF requires either a 2.7V–5.8V supply applied directly to INTVCC, or a 3V–100V supply applied to VDD (which internally regulates to ~5V at INTVCC). A 3.3V source alone cannot power the device unless connected to INTVCC. If using VDD, minimum valid input is 3V - but note that below 8V, the internal LDO is inactive and INTVCC must be externally supplied.

What is the function of GPIO3 and GPIO4 on LTC2992IDE-1#PBF?

GPIO3 on the LTC2992IDE-1#PBF can be configured as a DATAREADY output, pulsing low for 16 µs or 128 µs when new ADC conversion data is ready. GPIO4 serves as an SMBus ALERT output, pulled low when any programmed fault condition occurs (e.g., overvoltage, overcurrent). Both are open-drain and require external pull-ups; they provide hardware interrupt signaling to reduce I²C polling overhead in real-time systems.