Analog Devices Inc. LTC2908IDDB-A1#TRPBF

Overview

LTC2908IDDB-A1#TRPBF from Analog Devices (formerly Linear Technology) is a precision six-input supply voltage supervisor IC designed for multivoltage system power sequencing and brownout detection. It monitors 5V, 3.3V, 2.5V, 1.8V, and two adjustable inputs (VADJ1/VADJ2) with ±1.5% threshold accuracy over –40°C to +85°C, features a 200ms reset timeout, and delivers active-low open-drain RST output. It is used in network servers and optical networking systems requiring reliable, compact, and low-power supply monitoring.

For engineers reviewing the LTC2908IDDB-A1#TRPBF datasheet, LTC2908IDDB-A1#TRPBF pinout, LTC2908IDDB-A1#TRPBF application, or LTC2908IDDB-A1#TRPBF equivalent, this page provides verified technical context, exact pin functions, real-world application mappings, and validated alternative parts - all grounded in the official LTC2908 datasheet (Rev. D) and Analog Devices product documentation.

Technical Context

The LTC2908IDDB-A1#TRPBF implements six independent high-accuracy comparators with internal bandgap reference and glitch-immune timing logic. Its V1/V2 inputs serve dual roles: as monitored voltages and as internal VCC sources (whichever is higher powers the chip), enabling operation down to 0.5V while guaranteeing RST low-state integrity.

It integrates a 200ms reset timeout generator with automatic restart on any input undervoltage event, plus built-in first-order comparator filtering to suppress transients <250μs. The RST output uses a strong pull-down (≤0.15V at 5μA, VCC = 0.5V) and weak internal 6μA pull-up to VCC - supporting wired-OR configurations without external components.

Key Specifications

Pinout & Package

Package: 8-lead (3mm × 2mm) plastic DFN (DDB8), 1mm profile, exposed thermal pad (Pin 9, optional GND connection).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar supply monitor applications.

Compared with MAX6326US31D3+T and TPS3808G33DBVR, the LTC2908IDDB-A1#TRPBF uniquely integrates six precision voltage monitors, adjustable thresholds, and wired-OR RST in one DFN package - reducing component count, PCB area, and system-level validation effort for complex multirail platforms.

Availability

LTC2908IDDB-A1#TRPBF is available at Aetrix Electronics and suitable for network servers, optical networking systems, and wireless base stations requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LTC2908IDDB-A1#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors for industrial, automotive, communications, and healthcare applications.

The LTC2908 belongs to Linear Technology's precision power monitoring product line, engineered specifically for high-reliability multivoltage systems in telecom infrastructure, data centers, and embedded computing where supply integrity directly impacts uptime and safety.

FAQ

What is the operating temperature range for the LTC2908IDDB-A1#TRPBF?

The LTC2908IDDB-A1#TRPBF is rated for –40°C to +85°C industrial temperature range, as confirmed by its "I" grade marking and Absolute Maximum Ratings table. This ensures reliable operation in wireless base station outdoor enclosures and network server chassis with elevated ambient temperatures.

Does the LTC2908IDDB-A1#TRPBF require external timing components?

No, the LTC2908IDDB-A1#TRPBF integrates an internal 200ms reset timeout capacitor - eliminating the need for external RC networks. This simplifies layout, improves timing consistency across units, and reduces BOM count compared to supervisors requiring external timing capacitors.

How does the LTC2908IDDB-A1#TRPBF handle power-down sequencing?

During power-down, the LTC2908IDDB-A1#TRPBF asserts RST low as soon as any input drops below its threshold. With VCC ≥0.5V (from V1 or V2), it guarantees RST ≤0.15V - ensuring downstream logic remains held in reset even during deep brownout conditions.

Can unused inputs on the LTC2908IDDB-A1#TRPBF be left floating?

No - unused inputs (e.g., VADJ1/VADJ2 when only four rails are monitored) must be tied to the nearest higher supply voltage (e.g., V3 or V2) per datasheet guidance. Floating inputs risk noise coupling and false resets due to comparator instability.

What is the purpose of the exposed pad (Pin 9) on the LTC2908IDDB-A1#TRPBF DFN package?

The exposed pad (Pin 9) on the LTC2908IDDB-A1#TRPBF DFN package is thermally and electrically optional - it may be left unconnected or soldered to a GND plane to improve thermal dissipation and reduce θJA from 76°C/W to lower values in high-power-density layouts.