Analog Devices Inc. LTC2911ITS8-1#TRMPBF

Overview

LTC2911ITS8-1#TRMPBF from Analog Devices (formerly Linear Technology) is a precision triple supply monitor IC with integrated power-fail comparator and latched reset control. It monitors 3.3V (V1), 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 VCC for reliable power-up sequencing in embedded power management systems.

For engineers reviewing the LTC2911ITS8-1#TRMPBF datasheet, LTC2911ITS8-1#TRMPBF pinout, LTC2911ITS8-1#TRMPBF application, or LTC2911ITS8-1#TRMPBF equivalent, this page delivers verified functional identity, TSOT-23-8 package mapping, confirmed 3.086V/4.675V/0.5V thresholds, PFO early-warning signaling, and TMR latch-mode timing behavior - all validated against official Linear Technology documentation.

Technical Context

The LTC2911ITS8-1#TRMPBF implements three independent voltage comparators: V1 (3.3V fixed), V2 (5V fixed per -1 variant), and ADJ (0.5V nominal threshold). All comparators feature 1.5% total threshold accuracy across temperature and include glitch filtering for noise immunity. The device derives internal VCC from the higher of V1 or V2, enabling operation even during asymmetric supply ramp-up.

Its power-fail function uses the PFI input (500mV falling / 515mV rising threshold) to drive PFO low for early warning; the TMR pin supports three modes: external capacitor timeout, internal 200ms timeout (TMR = V1), or latch mode (TMR = GND) for margin testing. RST output is open-drain with weak internal pull-up to V1 and guaranteed low-state operation down to 0.5V VCC.

Key Specifications

Pinout & Package

Package: 8-lead TSOT-23 (TS8), 3mm × 1.75mm footprint, lead-free (PBF), rated θJA = 195°C/W. Exposed pad not present in TSOT-23 variant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326US33D3+T and TPS3808G33DBVR, the LTC2911ITS8-1#TRMPBF delivers integrated triple monitoring, ±1.5% accuracy, and PFO early-warning in a single TSOT-23-8 package - reducing component count by 2× and eliminating timing skew between rails.

Availability

LTC2911ITS8-1#TRMPBF is available at Aetrix Electronics and suitable for network servers, industrial PLCs, and automotive infotainment systems requiring stable component supply, extended temperature qualification, and long-term lifecycle support.

Supply support for LTC2911ITS8-1#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 full product support, datasheet archives, and application engineering resources for the LTC portfolio.

The LTC2911ITS8-1#TRMPBF belongs to Linear's precision voltage supervisor family, designed specifically for high-reliability power monitoring in multi-rail systems where timing accuracy, low VCC operation, and noise immunity are critical.

FAQ

What is the exact reset threshold voltage for V1 and V2 on the LTC2911ITS8-1#TRMPBF?

The LTC2911ITS8-1#TRMPBF has a V1 threshold of 3.086V (3.3V – 6.5%) and a V2 threshold of 4.675V (5V – 6.5%), both guaranteed within ±1.5% over –40°C to +85°C. These values are fixed for the -1 variant and documented in the Electrical Characteristics table under VRT33 and VRT50 parameters.

Does the LTC2911ITS8-1#TRMPBF support operation below 1V supply voltage?

Yes - the LTC2911ITS8-1#TRMPBF guarantees RST and PFO output low-state operation down to VCC = 0.5V, enabled by proprietary low-voltage drive circuitry. This ensures deterministic reset assertion during deep brownout conditions where many supervisors fail to respond.

How is the power-fail warning (PFO) triggered on the LTC2911ITS8-1#TRMPBF?

The PFO output on the LTC2911ITS8-1#TRMPBF pulls low when the PFI input voltage falls below 500mV (falling threshold), with 15mV typical hysteresis. This is configured using an external resistive divider on the PFI pin, allowing early warning of supply collapse before V1/V2/ADJ thresholds are violated.

Can the LTC2911ITS8-1#TRMPBF monitor a 1.2V supply as its third input?

Yes - the ADJ pin of the LTC2911ITS8-1#TRMPBF has a nominal 0.5V threshold and is designed for use with a resistive divider. To monitor 1.2V, connect it through a 2:1 resistor ratio (e.g., 100kΩ top, 50kΩ bottom) to yield 0.4V at ADJ, then adjust for 0.5V target using standard 1% resistor values.

What is the purpose of the TMR pin on the LTC2911ITS8-1#TRMPBF?

The TMR pin on the LTC2911ITS8-1#TRMPBF controls reset timeout and latch behavior: tied to V1 enables internal 200ms timeout; connected to GND latches RST state for margin testing; and fitted with a capacitor to GND sets external timeout (9.4ms/nF). Its dual function replaces discrete timing and test-enable circuitry.