Analog Devices Inc. LTC2936IGN

Overview

LTC2936IGN from Analog Devices is a six-channel programmable voltage supervisor IC with EEPROM, designed for FPGA and multi-rail power system monitoring and sequencing control. It features six highly accurate analog comparators (±0.5% threshold accuracy), three programmable GPIOs, I²C/SMBus interface, and instant-on functionality via on-chip EEPROM. It supports fast undervoltage/overvoltage detection and fault telemetry logging in systems such as Altera Arria 10 and Xilinx Virtex UltraScale FPGAs.

For engineers reviewing the LTC2936IGN datasheet, LTC2936IGN pinout, LTC2936IGN application, or LTC2936IGN equivalent, this device serves as a rugged, deterministic supervisor for critical power rail sequencing, real-time voltage margining, and fault-triggered system response - especially where precise timing, EEPROM-stored configuration, and fast comparator response (<1 µs) are required.

Technical Context

The LTC2936IGN integrates six independent analog comparators with user-programmable thresholds (0.4 V to 5.5 V range), each capable of detecting overvoltage and undervoltage events with ±0.5% accuracy over temperature. Its internal EEPROM stores configuration, enabling immediate supervision at power-up without host intervention.

It communicates via I²C/SMBus (up to 400 kHz), supports ALERTB and FAULTB open-drain outputs for system-level fault signaling, and provides three GPIO pins configurable as inputs, outputs, or interrupt sources. The device operates from a 2.7 V to 5.5 V supply and features UV disable (UVDIS) and margining (MARG) control bits per channel.

Key Specifications

Pinout & Package

Package: 16-lead QFN (3 mm × 3 mm, 0.5 mm pitch), thermally enhanced with exposed pad.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage supervision applications.

Compared with TPS389033 and MAX16054, the LTC2936IGN uniquely delivers six-channel ±0.5% accuracy, <1 µs response, EEPROM-based instant-on, and native FAULTB bus compatibility - making it the only option qualified for deterministic, fault-coordinated supervision in ADI PSM ecosystems and FPGA-centric designs.

Availability

LTC2936IGN is available at Aetrix Electronics and suitable for FPGA power sequencing, telecom multi-rail monitoring, and industrial PLC supervision requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for LTC2936IGN 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, communications, and industrial markets since 1965.

The LTC2936IGN belongs to Analog Devices' Power System Management (PSM) product line, engineered specifically for deterministic, fault-aware supervision and sequencing in complex FPGA, ASIC, and multi-processor systems.

FAQ

What is the primary function of the LTC2936IGN in a power system?

The LTC2936IGN is a six-channel programmable voltage supervisor IC that monitors up to six independent power rails for overvoltage and undervoltage conditions with ±0.5% threshold accuracy. It provides instant-on operation via on-chip EEPROM, supports I²C/SMBus configuration, and enables deterministic fault response through ALERTB and FAULTB outputs. In systems using the LTC2936IGN, precise rail supervision and sequencing coordination are achieved without host processor involvement at startup.

Does the LTC2936IGN support FPGA SmartVID voltage margining?

Yes, the LTC2936IGN supports SmartVID-style voltage margining through its per-channel MARG control bit and ±0.5% threshold accuracy. When used alongside SmartVID-capable regulators like the LTC3887 or LTM4676A, the LTC2936IGN validates final rail voltages and logs margining results to EEPROM. Its 1 µs response time ensures detection of transient violations during SmartVID voltage slewing, making LTC2936IGN a validated component in Altera Arria 10 and Xilinx Virtex UltraScale power architectures.

How does the LTC2936IGN integrate with other Analog Devices PSM ICs?

The LTC2936IGN integrates natively with other Analog Devices PSM ICs via shared FAULTB and SHARE_CLK buses. Its open-drain FAULTB output wires directly to LTC2937, LTC2975, or LTM4676A devices to trigger coordinated fault responses. The SHARE_CLK pin synchronizes timing across the system, enabling time-based sequencing even when multiple LTC2936IGN units supervise different rail groups. This interoperability is documented in Analog Devices' PSM system design guides and confirmed in reference schematics for Arria 10 and Virtex UltraScale platforms.

What is the role of the UVDIS pin on the LTC2936IGN?

The UVDIS (Undervoltage Disable) pin on the LTC2936IGN disables undervoltage detection while preserving overvoltage protection - a critical feature during controlled power-down sequences. When asserted, UVDIS prevents false undervoltage trips caused by intentional rail collapse, allowing safe discharge of bulk capacitors without triggering system resets. This behavior is explicitly defined in the LTC2936IGN datasheet and is used in down-sequencing implementations for Altera Arria 10, where Group 3 rails must discharge before Groups 1 and 2.

Can the LTC2936IGN operate without an I²C host controller?

Yes, the LTC2936IGN can operate fully autonomously without an I²C host controller. Its on-chip EEPROM stores all configuration - including comparator thresholds, GPIO modes, and MARG/UVDIS settings - enabling complete supervision within 100 µs of VDD ramp. All six comparators, ALERTB, FAULTB, and GPIOs function immediately at power-up. I²C is required only for reprogramming thresholds, reading telemetry, or updating configuration - not for basic supervision or sequencing operation. This instant-on capability is a defining feature of the LTC2936IGN.