Analog Devices Inc. LTC2937IUHE#PBF

Overview

LTC2937IUHE#PBF from Analog Devices is a six-channel programmable power supply sequencer and voltage supervisor with EEPROM-based autonomous operation. It enables precise time- and event-based sequencing of up to six supplies, monitors undervoltage/overvoltage with ±0.75% threshold accuracy, logs faults to nonvolatile memory, and supports single-wire synchronization across up to 50 devices (300 supplies) for large-scale systems. Used in telecom equipment and high-availability servers requiring deterministic power-up timing and root-cause fault diagnostics.

For engineers reviewing the LTC2937IUHE#PBF datasheet, LTC2937IUHE#PBF pinout, LTC2937IUHE#PBF application, or LTC2937IUHE#PBF equivalent, key selection considerations include its 28-lead QFN package, I²C/SMBus interface, programmable reset delay (0–1900 ms), 12 configurable UV/OV comparators, and EEPROM retention rated for 20 years at 125°C.

Technical Context

The LTC2937IUHE#PBF implements dual-mode sequencing-time-based (ton_delay/toff_delay up to 800 ms) and event-triggered (e.g., V1 reaching threshold before enabling V2)-with independent configuration per channel. Its six monitor inputs support three voltage ranges (0.2–1.2 V, 0.5–3 V, 1–6 V) and integrate discharge current sources (up to 45 mA) with programmable discharge thresholds (50–190 mV).

It features a hierarchical fault response system: ALERTB signals any fault condition, FAULTB allows external assertion, and RSTB asserts low on comparator violations with user-defined delay. Configuration and fault history are stored in on-chip EEPROM specified over –40°C to +85°C, supporting 10,000 write cycles and autonomous restart after power loss.

Key Specifications

Pinout & Package

28-lead (5 mm × 6 mm) plastic QFN package with exposed pad (Pin 29), rated for –40°C to +85°C operation. RoHS-compliant, lead-free finish.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar power supply sequencing and supervision applications.

Compared with TPS65988D and MAX16056, the LTC2937IUHE#PBF uniquely combines six-channel supervision with EEPROM-based fault logging, single-wire scalability to 300 supplies, and integrated discharge drivers-making it the only option qualified for high-availability telecom and server platforms requiring deterministic sequencing and post-failure diagnostics.

Availability

LTC2937IUHE#PBF is available at Aetrix Electronics and suitable for telecom equipment, data storage controllers, and high-availability computer systems requiring stable component supply, long-term lifecycle assurance, and guaranteed industrial temperature performance.

Supply support for LTC2937IUHE#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 LTC2937 product line delivers highly reliable, EEPROM-configurable power sequencing and supervision for mission-critical infrastructure where deterministic startup, fault traceability, and multi-device coordination are essential.

FAQ

What is the operating temperature range for the LTC2937IUHE#PBF?

The LTC2937IUHE#PBF is rated for –40°C to +85°C operation (I-grade), with full electrical specifications guaranteed across this range. Its EEPROM is characterized for 20-year data retention at 125°C, enabling use in thermally demanding telecom and industrial environments where ambient temperatures exceed 85°C but junction temperature remains within spec.

Does the LTC2937IUHE#PBF require an external microcontroller to function?

No-the LTC2937IUHE#PBF supports fully autonomous operation using its internal EEPROM. Once configured via I²C, it executes sequencing, supervision, fault response, and reset generation without host intervention. An external microcontroller is optional for dynamic reconfiguration or real-time status polling, but not required for basic power-up functionality.

How does the LTC2937IUHE#PBF handle slow-decaying power supplies during shutdown?

The LTC2937IUHE#PBF integrates dedicated discharge current sources (25–50 Ω on-resistance, up to 45 mA per channel) on each V1–V6 input. When enabled, these actively pull down monitored rails to accelerate discharge-critical for meeting safety standards and preventing unintended logic states during power-down sequences.

Can multiple LTC2937IUHE#PBF devices be synchronized without a master controller?

Yes-using the SHARE_CLK and SPCLK pins, up to 50 LTC2937IUHE#PBF devices can synchronize timing and sequence position over a single wire each, eliminating the need for a central sequencer. This distributed architecture scales to 300 total power supplies while maintaining deterministic inter-device timing alignment.

What protection mechanisms prevent accidental EEPROM writes on the LTC2937IUHE#PBF?

The LTC2937IUHE#PBF implements two-stage write protection: hardware-level via the WP pin (must be pulled low), and software-level via a lock bit in the WRITE_PROTECTION register. Both conditions must be satisfied before STORE commands execute-preventing corruption during noise events or firmware errors.