Analog Devices Inc. LTC2911CTS8-2#TRMPBF

Overview

LTC2911CTS8-2#TRMPBF from Analog Devices (formerly Linear Technology) is a precision triple supply monitor IC with integrated power-fail comparator and latched reset control, designed for reliable system supervision in space-constrained applications. 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 VCC - enabling robust power sequencing in desktop computers and industrial controllers.

For engineers reviewing the LTC2911CTS8-2#TRMPBF datasheet, LTC2911CTS8-2#TRMPBF pinout, LTC2911CTS8-2#TRMPBF application, or LTC2911CTS8-2#TRMPBF 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 dual-function TMR pin enabling both timeout selection and margin-test latch mode.

Technical Context

The LTC2911CTS8-2#TRMPBF implements three independent voltage comparators - one fixed at 3.086V (V1), one fixed at 2.338V (V2), and one adjustable via ADJ pin with 500mV nominal threshold - all featuring glitch-immune response and ±1.5% accuracy over full industrial temperature range. Its internal VCC is derived from the higher of V1 or V2, ensuring operation even during asymmetric supply ramp-up.

A dedicated PFI comparator with 500mV falling / 515mV rising threshold drives the open-drain PFO output for early power-fail warning, while the TMR pin supports three modes: external capacitor timing (9.4ms/nF), internal 200ms timeout (TMR = V1), or latch mode (TMR = GND) to hold RST state during margin testing.

Key Specifications

Pinout & Package

Package: 8-Lead TSOT-23 (TS8), 3mm × 1.75mm footprint, lead-free (PBF), rated for –40°C to 85°C operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6369UTA+T and TPS3808G33DBVR, the LTC2911CTS8-2#TRMPBF uniquely integrates triple-rail monitoring, programmable PFI threshold, and reset latch in a single TSOT-23 package - reducing component count by up to 2× while enabling advanced power management features essential for complex embedded systems.

Availability

LTC2911CTS8-2#TRMPBF is available at Aetrix Electronics and suitable for desktop computer power sequencing, industrial PLC controller supervision, and automotive infotainment head unit designs requiring stable component supply with guaranteed long-term availability.

Supply support for LTC2911CTS8-2#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, 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 by Linear Technology specifically for high-accuracy, low-power multi-rail system supervision in computing, industrial, and automotive applications - emphasizing ±1.5% threshold stability, sub-1V operation, and flexible timing control.

FAQ

What is the exact reset threshold voltage for V1 and V2 on the LTC2911CTS8-2#TRMPBF?

The LTC2911CTS8-2#TRMPBF has a V1 threshold of 3.086V (3.3V – 6.5%) and a V2 threshold of 2.338V (2.5V – 6.5%), both guaranteed within ±1.5% over –40°C to 85°C. These values are fixed per the "-2" variant designation and do not require external resistor calibration - simplifying design and improving long-term reliability.

Does the LTC2911CTS8-2#TRMPBF support adjustable reset timeout, and how is it configured?

Yes, the LTC2911CTS8-2#TRMPBF supports both internal and external reset timeout. Connecting the TMR pin to V1 enables the factory-trimmed 200ms timeout. For custom timing, connect a capacitor from TMR to GND: CTMR = tRST × 106.5 pF/ms (e.g., 2.2nF yields ~20ms). Leaving TMR open gives ~400µs minimum timeout.

Can the LTC2911CTS8-2#TRMPBF monitor a 1.2V supply, and if so, how?

Yes - the LTC2911CTS8-2#TRMPBF uses its ADJ pin (500mV threshold) with an external resistive divider to monitor 1.2V or other custom rails. For a 1.2V supply, use R1 = 100kΩ and R2 = 140kΩ (standard 1% values) to set trip point at 1.2V × (500mV / 1.2V) = 500mV at ADJ. The ADJ input draws only ±15nA, minimizing divider error.

What is the function of the PFI and PFO pins on the LTC2911CTS8-2#TRMPBF?

The PFI pin accepts a divided-down version of a primary supply (e.g., 12V input rail) and compares it to a 500mV falling / 515mV rising threshold. When PFI falls below 500mV, the open-drain PFO pin pulls low - providing early warning of imminent power failure to trigger controlled shutdown before V1/V2/ADJ trip.

How does the TMR pin enable reset latching for margin testing on the LTC2911CTS8-2#TRMPBF?

Pulling the TMR pin to GND places the LTC2911CTS8-2#TRMPBF into latch mode: RST state (high or low) is frozen regardless of subsequent input conditions. Releasing TMR restores normal monitoring - if inputs were valid during latch, RST remains high; if invalid, RST asserts after t_P,LR (≤3µs) propagation delay.