Analog Devices Inc. LTC2906IDDB#TRMPBF

Overview

LTC2906IDDB#TRMPBF from Analog Devices (formerly Linear Technology) is a precision dual supply monitor IC with one pin-selectable threshold input (5V/3.3V/2.5V) and one adjustable 0.5V input, designed for reliable power-up/power-down/brownout detection in multi-rail systems. It features ±1.5% threshold accuracy over –40°C to +85°C, 200ms fixed reset delay, open-drain RST output, and guaranteed operation down to V1 ≥ 1V or VCC ≥ 1V. Used in desktop/notebook computers and network servers for core/I/O voltage supervision.

For engineers reviewing the LTC2906IDDB#TRMPBF datasheet, LTC2906IDDB#TRMPBF pinout, LTC2906IDDB#TRMPBF application, or LTC2906IDDB#TRMPBF equivalent, key selection criteria include its fixed 200ms reset timeout, DFN-8 (3mm × 2mm) package, dual-input monitoring architecture, ±1.5% temperature-stable threshold accuracy, and support for 5%/7.5%/10% supply tolerance programming via S1/TOL pins.

Technical Context

The LTC2906IDDB#TRMPBF integrates two independent comparators-one with programmable thresholds (via S1) and one with adjustable trip point (VADJ)-both referenced to a bandgap-based 0.5V internal reference scaled per TOL setting. Its internal VMAX logic selects the higher of V1 or VCC as the supply for reset generation and output drivers.

Reset assertion is triggered when either monitored voltage falls below its programmed threshold; recovery requires both inputs to remain above threshold for the full 200ms delay. Glitch immunity is achieved via comparator output integration and the fixed delay, eliminating spurious resets from supply noise without sacrificing threshold accuracy.

Key Specifications

Pinout & Package

Package: 8-lead plastic DFN (3mm × 2mm), exposed pad (Pin 9) soldered to PCB ground for thermal and electrical performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-supply monitoring applications.

Compared with LTC2907IDDB#TRMPBF and TPS3808G33DBVR, the LTC2906IDDB#TRMPBF uniquely delivers fixed-timing dual-rail supervision with ±1.5% accuracy and 0.5V adjustable input in a compact DFN-8 package-making it optimal for space-constrained, multi-rail systems requiring deterministic reset behavior.

Availability

LTC2906IDDB#TRMPBF is available at Aetrix Electronics and suitable for desktop computers, notebook computers, and network servers requiring stable component supply, precise dual-supply monitoring, and industrial-grade temperature operation.

Supply support for LTC2906IDDB#TRMPBF 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-precision analog and power management product lines with rigorous quality and longevity commitments.

The LTC2906IDDB#TRMPBF belongs to Linear's precision power supervision family, engineered specifically for reliable multi-rail voltage monitoring in computing and communications infrastructure where deterministic reset timing and tight threshold accuracy are mission-critical.

FAQ

What is the operating temperature range for the LTC2906IDDB#TRMPBF?

The LTC2906IDDB#TRMPBF is rated for –40°C to +85°C (Industrial grade). This range is confirmed in the "Order Information" table on page 2 of the datasheet, where "LTC2906I" denotes the Industrial temperature version, and "DDB" specifies the DFN-8 package. All electrical characteristics-including ±1.5% threshold accuracy-are guaranteed across this full range.

Does the LTC2906IDDB#TRMPBF require external components for basic operation?

No, the LTC2906IDDB#TRMPBF operates without external resistors for threshold selection-S1 and TOL pins use V1/GND/open states to configure V1 voltage and tolerance. Only bypass capacitors (0.1µF on VCC, V1, and VADJ) are required for noise immunity. No timing resistors or dividers are needed for standard 5V/3.3V/2.5V monitoring.

Can the LTC2906IDDB#TRMPBF monitor a 1.2V supply?

Yes, via the VADJ input. The LTC2906IDDB#TRMPBF has a nominal 0.5V comparator threshold; connecting a resistor divider from a 1.2V rail to GND-with VADJ tied to the divider tap-sets the trip point. For example, a 1.2V rail with 10% tolerance uses R1 = 124kΩ and R2 = 100kΩ (per Table 2), yielding ~1.12V trip at 5% tolerance, scaled accordingly for 7.5%/10%.

What is the function of the exposed pad (Pin 9) on the LTC2906IDDB#TRMPBF DFN package?

The exposed pad (Pin 9) on the LTC2906IDDB#TRMPBF is electrically and thermally connected to GND. Per the DDB package drawing (page 14), it "MUST BE SOLDERED TO PCB" to ensure proper thermal dissipation and low-impedance ground return. Leaving it unconnected degrades thermal performance and may compromise reset output stability under load.

How does the LTC2906IDDB#TRMPBF guarantee RST output state when V1 drops below 1V?

The LTC2906IDDB#TRMPBF guarantees RST logic low (≤0.4V) as long as V1 ≥ 1V or VCC ≥ 1V, per Absolute Maximum Ratings and Electrical Characteristics (page 2, "Guaranteed RST for V1 ≥ 1V or VCC ≥ 1V"). Below 1V, the internal circuitry cannot maintain output drive-but the part ensures correct assertion *down to* that limit, enabling reliable brownout detection in systems with gradual power decay.