Analog Devices Inc. LTC2911CTS8-2#TRPBF

Overview

LTC2911CTS8-2#TRPBF 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), 2.5V (V2), and an adjustable threshold (ADJ) with ±1.5% 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 industrial DC/DC systems.

For engineers reviewing the LTC2911CTS8-2#TRPBF datasheet, LTC2911CTS8-2#TRPBF pinout, LTC2911CTS8-2#TRPBF application, or LTC2911CTS8-2#TRPBF equivalent, key selection criteria include its dual fixed/adjustable voltage monitoring architecture, PFI-based early-warning power-fail signaling, TMR latch capability for margin testing, and TSOT-23-8 package compatibility with space-constrained embedded power rails.

Technical Context

The LTC2911CTS8-2#TRPBF implements three independent comparators: one fixed 3.086V threshold on V1, one fixed 2.338V threshold on V2 (for 2.5V nominal supply), and one 500mV threshold on ADJ configurable via resistive divider. All comparators feature 1.5% total threshold accuracy across temperature and built-in glitch filtering.

Its power-fail function uses a dedicated PFI input with 500mV falling / 515mV rising thresholds (3% hysteresis) to drive PFO low before monitored supplies collapse. The TMR pin enables three modes: external capacitor timeout, internal 200ms timeout (TMR = V1), or latch mode (TMR = GND) to hold RST state during voltage margining.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6369ESA+ and TPS3808G33DBVR, the LTC2911CTS8-2#TRPBF uniquely integrates three independent voltage monitors, a dedicated power-fail comparator with hysteresis, and latch-enabled margin testing-enabling complete power integrity management in a single TSOT-23-8 device without external components.

Availability

LTC2911CTS8-2#TRPBF is available at Aetrix Electronics and suitable for industrial PLCs, automotive infotainment systems, network equipment hot-swap modules, and medical imaging power subsystems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LTC2911CTS8-2#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.

The LTC2911 family was designed specifically for precision multi-rail power monitoring in industrial, automotive, and telecom infrastructure where ±1.5% threshold accuracy, low quiescent current, and early power-fail warning are mandatory.

FAQ

What is the exact V2 threshold voltage for LTC2911CTS8-2#TRPBF and how is it specified?

The LTC2911CTS8-2#TRPBF has a V2 threshold of 2.338V ±1.5% (2.300V to 2.375V) over the full –40°C to +85°C operating range. This corresponds to a –6.5% tolerance on a nominal 2.5V supply and is guaranteed in the Electrical Characteristics table under symbol VRT25. The part marking "-2" in LTC2911CTS8-2#TRPBF explicitly denotes the 2.5V V2 variant.

Does LTC2911CTS8-2#TRPBF support operation below 1V, and what is the minimum functional VCC?

Yes, the LTC2911CTS8-2#TRPBF guarantees RST and PFO output functionality down to VCC = 0.5V, enabling reliable reset assertion during deep brownout conditions. Its proprietary low-voltage drive circuitry maintains valid logic levels even as the higher of V1 or V2 decays below 1V, preventing indeterminate states during power-up or power-down transitions.

How does the TMR pin function in latch mode for margin testing with LTC2911CTS8-2#TRPBF?

When the TMR pin of LTC2911CTS8-2#TRPBF is pulled to GND, the RST output state is latched and held regardless of subsequent V1/V2/ADJ voltage changes. This allows engineers to safely reduce supply voltages during margin testing without triggering unwanted resets. Releasing TMR (to open or V1) restores normal monitoring after a propagation delay of ≤3µs.

Can LTC2911CTS8-2#TRPBF monitor a single supply with both reset and power-fail functions using one resistor divider?

Yes, LTC2911CTS8-2#TRPBF supports combined monitoring: connect a three-resistor divider to both ADJ and PFI pins to set distinct trip points-for example, 4.0V for reset (ADJ) and 4.5V for power-fail warning (PFI). The internal 500mV/515mV thresholds and separate comparators ensure independent, hysteresis-protected responses without cross-coupling.

What is the maximum allowable leakage current for the external capacitor on the TMR pin of LTC2911CTS8-2#TRPBF?

The external capacitor on the TMR pin of LTC2911CTS8-2#TRPBF must exhibit leakage current ≤500nA to maintain timer accuracy. Higher leakage degrades the 9.4ms/nF timing constant, causing significant timeout deviation. Ceramic capacitors (e.g., X7R, C0G) with rated voltage ≥6.3V are recommended; avoid electrolytics or high-leakage dielectrics.