Analog Devices Inc. LTC2908CDDB-C1#TRPBF

Overview

LTC2908CDDB-C1#TRPBF from Analog Devices (formerly Linear Technology) is a precision six-input supply voltage supervisor IC designed for multivoltage systems requiring accurate, low-power monitoring of 2.5V and five adjustable rails. It features ±1.5% threshold accuracy over temperature, 200ms reset timeout, active-low open-drain RST output, and guaranteed operation down to VCC = 0.5V. It is used in optical networking systems and desktop computers for reliable power-on reset and brownout detection.

For engineers reviewing the LTC2908CDDB-C1#TRPBF datasheet, LTC2908CDDB-C1#TRPBF pinout, LTC2908CDDB-C1#TRPBF application, or LTC2908CDDB-C1#TRPBF equivalent, key selection criteria include its fixed 2.5V input (V1), five ADJ inputs (VADJ1–VADJ5) with 0.5V reference, DFN-8 package, 0.5V minimum VCC operation, and ultralow-voltage RST pull-down capability - all critical for compact, multirail embedded power sequencing.

Technical Context

The LTC2908CDDB-C1#TRPBF implements six independent comparators with internal 0.5V bandgap reference, where V1 serves as both monitored rail and sole internal supply (VCC). All five adjustable inputs (VADJ1–VADJ5) compare against the same 0.5V threshold, enabling precise monitoring of diverse supply voltages via external resistor dividers.

Its reset logic asserts RST low when any input falls below its threshold and holds it low for ≥200ms after all inputs recover. Glitch immunity is achieved through integrated comparator filtering and the 200ms timeout, eliminating need for external timing capacitors or hysteresis networks.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G33DBVR and MAX6816EUT+T, the LTC2908CDDB-C1#TRPBF uniquely delivers six-input monitoring with one fixed 2.5V rail and five ADJ inputs in a single DFN-8 package, enabling compact, accurate supervision of complex multivoltage systems without external timing components or accuracy compromises.

Availability

LTC2908CDDB-C1#TRPBF is available at Aetrix Electronics and suitable for optical networking systems, desktop computers, and network servers requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.

Supply support for LTC2908CDDB-C1#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 acquired Linear Technology in 2017 and maintains its high-performance analog and power management product lines with rigorous automotive and industrial qualification standards.

The LTC2908 family was designed specifically for precision multivoltage system supervision in space-constrained, high-reliability applications such as telecom infrastructure and computing platforms where rail count, accuracy, and ultralow-voltage operation are critical.

FAQ

What is the exact input configuration supported by the LTC2908CDDB-C1#TRPBF?

The LTC2908CDDB-C1#TRPBF monitors one fixed 2.5V supply on V1 and five adjustable supplies on VADJ1 through VADJ5, each compared to an internal 0.5V reference. This differs from the A1/B1 variants which include fixed 5V/3.3V/1.8V/1.5V inputs. The C1 variant is optimized for systems where all non-2.5V rails require programmable thresholds via external resistor dividers.

Does the LTC2908CDDB-C1#TRPBF require external timing components for its 200ms reset timeout?

No, the LTC2908CDDB-C1#TRPBF integrates the 200ms reset timeout capacitor internally. No external RC network is needed - the timing is factory-trimmed and specified from 160ms to 260ms over temperature. This eliminates component count, layout area, and tolerance-related drift in the reset delay.

How does the LTC2908CDDB-C1#TRPBF ensure reliable reset assertion during deep brownout conditions?

The LTC2908CDDB-C1#TRPBF guarantees correct RST logic state (low) as long as V1 ≥ 0.5V. Its internal pull-down circuit remains functional down to this voltage, delivering ≤0.15V at RST with 5μA load. This prevents floating reset lines and ensures deterministic system reset even when main supplies collapse to near-single-cell battery levels.

Can multiple LTC2908CDDB-C1#TRPBF devices be connected for more than six supply monitors?

Yes - the open-drain RST outputs of two or more LTC2908CDDB-C1#TRPBF devices can be wired-OR together. When any input across any device falls below threshold, the combined RST line pulls low. Recovery requires all inputs on all devices to remain above threshold for their respective 200ms timeouts before RST releases.

What is the maximum input voltage rating for the VADJ pins on the LTC2908CDDB-C1#TRPBF?

The VADJ1–VADJ5 pins on the LTC2908CDDB-C1#TRPBF are rated for –0.3V to (VCC + 0.6V), where VCC = V1. With V1 = 2.5V, the absolute maximum is 3.1V. However, practical use with resistor dividers allows monitoring of higher supplies (e.g., 12V) by scaling down to ≤3.1V at the VADJ pin - confirmed by Linear's Table 1 recommending R2 = 100kΩ for 12V → 11.25V trip.