Analog Devices Inc. LTC2906IDDB#TRPBF

Overview

LTC2906IDDB#TRPBF from Analog Devices (formerly Linear Technology) is a precision dual supply monitor IC designed for reliable power-on reset and brownout detection in multi-rail systems. It monitors two independent voltage inputs - one pin-selectable (5V/3.3V/2.5V) and one adjustable (0.5V nominal threshold) - with ±1.5% threshold accuracy over –40°C to +85°C, 200ms fixed reset delay, and open-drain RST output. It is used in notebook computers, network servers, and core/I/O power sequencing.

For engineers reviewing the LTC2906IDDB#TRPBF datasheet, LTC2906IDDB#TRPBF pinout, LTC2906IDDB#TRPBF application, or LTC2906IDDB#TRPBF equivalent, key selection considerations include guaranteed RST assertion down to V1 ≥ 1V or VCC ≥ 1V, three supply tolerance options (5%/7.5%/10%), internal VCC auto-select, glitch immunity, and DFN-8 (3mm × 2mm) package compatibility with space-constrained embedded designs.

Technical Context

The LTC2906IDDB#TRPBF integrates two high-accuracy comparators with a shared bandgap reference and programmable resistor network. Its V1 input uses a three-state S1 pin to select nominal thresholds (5V/3.3V/2.5V), while VADJ accepts an externally divided voltage with trip point set by TOL pin programming (5%/7.5%/10%). Both inputs share identical ±1.5% threshold accuracy across temperature.

Reset logic is triggered when either input falls below its programmed threshold; recovery requires both inputs to remain above threshold for the full 200ms delay before RST releases. The open-drain RST output is driven by a strong pull-down and weak internal pull-up to VMAX (max of V1/VCC), ensuring valid logic state even during partial power loss.

Key Specifications

Pinout & Package

Package: 8-lead plastic DFN (3mm × 2mm), 0.75mm profile, exposed thermal pad (Pin 9, GND). RoHS-compliant, moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC2907IDDB#TRPBF, the LTC2906IDDB#TRPBF offers deterministic timing without external capacitors, simplifying BOM and layout; versus TPS3808G33DBVR, it delivers true dual-rail supervision with field-programmable thresholds and superior accuracy (±1.5% vs. ±2.5%), making it essential for multi-voltage systems requiring coordinated reset behavior.

Availability

LTC2906IDDB#TRPBF is available at Aetrix Electronics and suitable for desktop computers, network servers, and handheld devices requiring stable component supply, industrial temperature operation, and precision dual-supply monitoring.

Supply support for LTC2906IDDB#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 continues its legacy of high-performance analog ICs for precision power, signal conditioning, and timing applications.

The LTC2906 belongs to Linear's precision power monitoring product line, engineered for systems demanding accurate, glitch-immune reset generation across multiple supply rails without microcontroller intervention.

FAQ

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

The LTC2906IDDB#TRPBF is rated for –40°C to +85°C (Industrial grade), with full electrical specifications guaranteed across this range. This includes ±1.5% threshold accuracy, 200ms reset delay, and valid RST output behavior down to V1 ≥ 1V or VCC ≥ 1V. The DFN-8 package supports thermal dissipation in compact enclosures typical of industrial and computing applications. The LTC2906IDDB#TRPBF is not rated for automotive or extended temperature grades.

How does the LTC2906IDDB#TRPBF handle power loss on the V1 rail?

When V1 drops below its programmed threshold, the LTC2906IDDB#TRPBF immediately asserts RST low. If VCC remains ≥ 1V, the internal VMAX sustains RST drive capability, guaranteeing VOL ≤ 0.4V at 2.5mA load. This ensures clean, unambiguous reset signaling even during asymmetric rail collapse. The LTC2906IDDB#TRPBF does not require external hold-up capacitance on VCC to maintain RST validity during V1 failure.

Can the LTC2906IDDB#TRPBF monitor a 1.2V supply?

Yes - the LTC2906IDDB#TRPBF monitors 1.2V supplies via the VADJ input using an external resistor divider. With TOL set for 5% tolerance, the nominal VADJ threshold is 0.5V; selecting R1/R2 values per Table 2 (e.g., R1 = 182kΩ, R2 = 100kΩ for 1.2V → 0.5V) achieves precise trip points. The ±1.5% accuracy applies to the *monitored voltage*, so 1.2V trip uncertainty is ±18mV - tighter than most alternatives.

Is the LTC2906IDDB#TRPBF pin-compatible with the LTC2906CDDB#TRPBF?

Yes - the LTC2906IDDB#TRPBF and LTC2906CDDB#TRPBF share identical DFN-8 pinout, electrical characteristics, and functionality. The only difference is temperature grade: "I" denotes –40°C to +85°C, while "C" is 0°C to +70°C. Both use the same LBDD marking and are interchangeable in layouts, but the LTC2906IDDB#TRPBF is required for industrial ambient conditions.

Does the LTC2906IDDB#TRPBF require external pull-up resistors on the RST pin?

No - the LTC2906IDDB#TRPBF features an internal weak pull-up to VMAX (typically –6µA), sufficient for most microcontroller reset inputs with moderate rise-time requirements. An external pull-up is recommended only if faster rise time (<10µs) or VOH > VMAX is needed. Adding a resistor reduces rise time but increases total pull-down current required from other wired-OR devices sharing the RST line.