Analog Devices Inc. LTC2975CUP#TRPBF

Overview

LTC2975CUP#TRPBF from Analog Devices is a 4-channel PMBus Power System Manager that sequences, trims, margins, supervises, and logs faults across four DC/DC output rails while measuring input current (±1% accuracy), input energy, and real-time power. It integrates a 16-bit ADC for monitoring four output voltages, four output currents, four external temperatures, input voltage/current, and die temperature - deployed in network servers and high-reliability industrial systems.

For engineers reviewing the LTC2975CUP#TRPBF datasheet, LTC2975CUP#TRPBF pinout, LTC2975CUP#TRPBF application, or LTC2975CUP#TRPBF equivalent, this device supports autonomous fault logging to internal EEPROM with ECC, soft-connect DACs for low-disturbance margining, single-wire clock synchronization across multiple ADI PSM devices, and operation from either 3.3V or 4.5V–15V VPWR supply.

Technical Context

The LTC2975CUP#TRPBF implements a dedicated PMBus-compliant command set for sequencing, servo control, and telemetry reporting, with programmable fault responses including automatic black-box EEPROM storage upon channel disable. Its internal 16-bit ADC digitizes analog inputs at up to 62.5 kHz sampling rate, supporting differential voltage sensing (0–6 V) and current sensing (±170 mV full-scale).

It features four independent VDAC outputs (10-bit resolution, ±2 LSB INL), configurable overvoltage/undervoltage/overcurrent thresholds per channel, and a programmable watchdog timer with first-time and periodic timeout settings (MFR_WATCHDOG_T_FIRST, MFR_WATCHDOG_T). Input energy accumulation uses calibrated IIN_SNS and VIN_SNS paths with MFR_EIN_CONFIG-controlled integration modes.

Key Specifications

Pinout & Package

Package: 64-lead (9 mm × 9 mm) plastic QFN with exposed thermal pad (Pin 65 = GND, must be soldered to PCB).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 4-channel power system management applications.

Compared with LTC2975CUP#TRPBF, the LTC2974CUP#TRPBF omits input energy metering but retains identical sequencing and telemetry capabilities for output rails, while the TPS53679RTAT provides higher-current phase control without autonomous fault response or PMBus configurability - making LTC2975CUP#TRPBF uniquely suited for telemetry-driven reliability-critical systems.

Availability

LTC2975CUP#TRPBF is available at Aetrix Electronics and suitable for network servers, industrial PLCs, medical imaging equipment, and test instrumentation requiring stable component supply, long-term lifecycle support, and automotive-grade reliability validation.

Supply support for LTC2975CUP#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 semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and power management.

The LTC2975CUP#TRPBF belongs to ADI's Power System Management (PSM) product line, engineered for autonomous, standards-compliant control of complex multi-rail power architectures in datacenter, industrial, and medical systems.

FAQ

What is the operating temperature range for the LTC2975CUP#TRPBF?

The LTC2975CUP#TRPBF is rated for 0°C to 70°C ambient operation (C-grade). This specification is confirmed in the Order Information table of the Rev. D datasheet, where "LTC2975CUP#TRPBF" is explicitly listed with "0°C to 70°C" under Temperature Range. It uses the same silicon die as the I-grade variant but is screened and tested to meet commercial-temperature performance limits.

Does the LTC2975CUP#TRPBF support input energy accumulation, and how is it configured?

Yes, the LTC2975CUP#TRPBF supports input energy metering via dedicated IIN_SNS and VIN_SNS inputs and the MFR_EIN_CONFIG register. Energy is accumulated in watt-hours using calibrated gain/offset parameters (MFR_IIN_CAL_GAIN, MFR_VIN_CAL_GAIN), with integration intervals selectable between 190 ms (default) and 500 ms. Configuration is performed via PMBus commands MFR_COMMAND_PLUS and MFR_DATA_PLUS0.

Is the LTC2975CUP#TRPBF pin-compatible with other members of the LTC297x family?

Yes, the LTC2975CUP#TRPBF is pin-compatible with the LTC2974 in the same 64-lead QFN package, as stated in the Features section: "Pin-Compatible to the LTC2974". This allows drop-in replacement where input energy metering is not required, though firmware updates may be needed to disable unused LTC2975-specific registers like MFR_EIN.

What fault logging capability does the LTC2975CUP#TRPBF provide?

The LTC2975CUP#TRPBF includes internal EEPROM with ECC protection that automatically stores fault status, timestamps, and associated telemetry (VOUT, IOUT, temperature, VIN, IIN) when a latched fault disables a power rail. Fault logs are accessed via PMBus commands MFR_FAULT_LOG_STORE and MFR_FAULT_LOG_READ, and retain data through power cycles without host intervention.

Can the LTC2975CUP#TRPBF operate from a 3.3 V supply only, without VPWR?

Yes, the LTC2975CUP#TRPBF can be powered solely from a 3.3 V supply applied to the VDD33 pin, as confirmed in the Features list: "Can Be Powered from 3.3V, or 4.5V to 15V". In this mode, VPWR is left unconnected, and internal regulators derive VDD25 and reference voltages from VDD33 - enabling use in low-voltage systems where higher VPWR rails are unavailable.