Analog Devices Inc. LTC2911ITS8-2#TRPBF

Overview

LTC2911ITS8-2#TRPBF from Analog Devices (formerly Linear Technology) is a precision triple supply monitor IC with integrated power-fail comparator and latchable reset output. It monitors 3.3V (V1), 2.5V (V2), and an adjustable input (ADJ) with ±1.5% threshold accuracy over –40°C to 85°C, supports internal 200ms reset timeout, and operates down to 0.5V V_CC. Used in industrial power sequencing and embedded systems requiring reliable brownout detection.

For engineers reviewing the LTC2911ITS8-2#TRPBF datasheet, LTC2911ITS8-2#TRPBF pinout, LTC2911ITS8-2#TRPBF application, or LTC2911ITS8-2#TRPBF equivalent, key selection criteria include its guaranteed 0.5V minimum operating voltage, tight 1.5% threshold tolerance across temperature, TSOT-23-8 package footprint, and configurable PFI-based early-warning signaling for controlled shutdown.

Technical Context

The LTC2911ITS8-2#TRPBF implements three independent voltage comparators - one fixed at 3.086V (V1), one fixed at 2.338V (V2), and one adjustable via external divider with 500mV nominal threshold (ADJ). Its power-fail comparator uses a 500mV falling / 515mV rising threshold with 3% hysteresis on the PFI input for noise immunity.

Reset assertion is synchronized to all three monitored inputs; RST remains low until all exceed thresholds for ≥200ms (internal timeout enabled by tying TMR to V1). The TMR pin also supports latching RST state for margin testing, and PFO provides open-drain early-warning output referenced to V1.

Key Specifications

Pinout & Package

Package: 8-Lead TSOT-23 (TS8), 3mm × 1.75mm footprint, exposed pad optional, θ_JA = 195°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6369KA+T and TPS3808G33DBVR, the LTC2911ITS8-2#TRPBF uniquely integrates triple-supply monitoring, PFI-based early-warning signaling, and latchable reset in a single TSOT-23-8 package - reducing BOM count and PCB area while enabling robust fault response in space-constrained industrial and automotive systems.

Availability

LTC2911ITS8-2#TRPBF is available at Aetrix Electronics and suitable for industrial PLCs, automotive infotainment systems, network switch line cards, and medical imaging boards requiring stable component supply with guaranteed long-term availability.

Supply support for LTC2911ITS8-2#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, acquired Linear Technology in 2017 to strengthen its precision power and interface portfolio.

The LTC2911 family was designed for high-reliability embedded systems requiring precise, multi-rail voltage supervision with fail-safe early-warning capability - targeting industrial automation, automotive electronics, and telecom infrastructure.

FAQ

What is the exact reset threshold voltage for V1 and V2 on the LTC2911ITS8-2#TRPBF?

The LTC2911ITS8-2#TRPBF has a guaranteed V1 reset threshold of 3.086V (3.3V – 6.5%) and V2 threshold of 2.338V (2.5V – 6.5%), both with ±1.5% accuracy over –40°C to 85°C. These values are specified in the Electrical Characteristics table under VRT33 and VRT25, respectively, and apply across the full industrial temperature range without derating.

How does the LTC2911ITS8-2#TRPBF achieve power-fail early warning, and what is the PFI threshold?

The LTC2911ITS8-2#TRPBF uses the PFI pin to monitor a primary supply via resistive divider, comparing it to an internal 500mV falling-edge threshold. When PFI drops below 500mV, PFO pulls low - providing early warning before V1/V2/ADJ fall below their thresholds and trigger RST. The rising-edge threshold is 515mV, delivering 3% hysteresis for noise immunity.

Can the LTC2911ITS8-2#TRPBF operate with only one supply, and what is its minimum functional voltage?

Yes - the LTC2911ITS8-2#TRPBF derives internal V_CC from the higher of V1 or V2, but functions fully with only V1 powered. Its RST and PFO outputs remain valid down to 0.5V V_CC, enabling operation during deep brownout or battery depletion scenarios where other supervisors would fail.

What is the function of the TMR pin on the LTC2911ITS8-2#TRPBF, and how is it used for margin testing?

The TMR pin on the LTC2911ITS8-2#TRPBF controls reset timeout and enables latch mode. Tying TMR to V1 activates the internal 200ms timeout. Pulling TMR to GND latches the current RST state - holding it high or low regardless of input conditions - which simplifies voltage margin testing without requiring external logic or PCB modifications.

Does the LTC2911ITS8-2#TRPBF require external components for basic operation, and what are the mandatory ones?

The LTC2911ITS8-2#TRPBF requires only a 0.1µF bypass capacitor on V1 for stable operation. No external timing components are needed when using the internal 200ms timeout (TMR tied to V1). External resistors are optional: ADJ and PFI use dividers only when monitoring adjustable or primary supplies beyond the fixed V1/V2 rails.