Analog Devices Inc. LTC2911HTS8-5#TRMPBF

Overview

LTC2911HTS8-5#TRMPBF from Analog Devices (formerly Linear Technology) is a high-accuracy triple supply monitor IC with integrated power-fail comparator and latchable reset output. It monitors V1 (3.3V), V2 (adjustable), and ADJ (0.5V threshold) inputs with ±1.5% threshold accuracy over –40°C to +125°C, supports internal 200ms or external capacitor–configured timeout, and operates down to 0.5V supply for reliable power-up sequencing in automotive control units.

For engineers reviewing the LTC2911HTS8-5#TRMPBF datasheet, LTC2911HTS8-5#TRMPBF pinout, LTC2911HTS8-5#TRMPBF application, or LTC2911HTS8-5#TRMPBF equivalent, key selection criteria include its automotive-grade temperature range, adjustable dual-monitor configuration (V2/ADJ), PFI-based early-warning capability, and latched RST for margin testing under voltage stress.

Technical Context

The LTC2911HTS8-5#TRMPBF implements three independent comparators: V1 fixed at 3.086V (3.3V −6.5%), V2 configured as high-impedance adjustable input (nominal 0.5V threshold), and ADJ also with 0.5V threshold-enabling dual-resistive-divider monitoring of two distinct supplies. Its internal VCC is derived solely from V1, decoupling operation from V2 voltage level.

It integrates a dedicated power-fail comparator (PFI/PFO) with 500mV falling-edge threshold and 15mV hysteresis, plus TMR-controlled latch mode that holds RST low regardless of input states-critical for controlled system margining. Propagation delays are tightly specified: tUV = 8–80µs for undervoltage detection and tP,PF = 8–80µs for PFI-to-PFO response.

Key Specifications

Pinout & Package

Package: 8-Lead Plastic TSOT-23 (TS8), 3mm × 1.75mm footprint, exposed pad optional, rated for TJMAX = 150°C and 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 TPS3808G33DBVR and MAX6369KA+T, the LTC2911HTS8-5#TRMPBF uniquely delivers dual adjustable inputs (V2/ADJ), integrated PFI/PFO for predictive shutdown, latchable RST for margin testing, and guaranteed 0.5V operation-making it the only option qualified for demanding automotive and industrial triple-monitor applications requiring configurability and fail-safe signaling.

Availability

LTC2911HTS8-5#TRMPBF is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLCs, medical infusion pumps, and telecom base station management systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LTC2911HTS8-5#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.

The LTC2911 product line was designed specifically for high-accuracy, low-power supply monitoring in automotive, industrial, and medical systems where reliability across extreme temperatures and precise voltage thresholds are critical.

FAQ

What is the exact reset threshold voltage for V1 on the LTC2911HTS8-5#TRMPBF?

The V1 reset threshold for LTC2911HTS8-5#TRMPBF is 3.086V nominal, with guaranteed limits of 3.036V (min) and 3.135V (max) over the full –40°C to +125°C operating temperature range. This corresponds to a –6.5% offset from 3.3V and reflects the ±1.5% accuracy specification. The value is fixed and not adjustable-only V2 and ADJ inputs support custom threshold configuration via resistive dividers.

Does the LTC2911HTS8-5#TRMPBF support monitoring two independently adjustable supplies?

Yes, the LTC2911HTS8-5#TRMPBF supports monitoring two independently adjustable supplies using its V2 and ADJ pins-both with 0.5V nominal thresholds. Unlike other LTC2911 variants (e.g., -1 through -4), the -5 version configures V2 as a high-impedance adjustable input identical to ADJ. This enables true dual-resistive-divider monitoring (e.g., 1.2V core + 1.8V I/O) without external components.

How does the PFI/PFO function work on the LTC2911HTS8-5#TRMPBF?

The PFI input on LTC2911HTS8-5#TRMPBF compares an external voltage (set by a resistive divider) against a 500mV falling-edge threshold. When PFI drops below this level, PFO asserts low-providing early warning of impending power failure. PFO releases high when PFI rises above 515mV (3% hysteresis). This enables predictive shutdown actions (e.g., NMI to MCU, nonvolatile save) before V1/V2/ADJ trip.

Can the reset timeout period be changed on the LTC2911HTS8-5#TRMPBF without adding external components?

Yes-the LTC2911HTS8-5#TRMPBF includes an internal 200ms reset timeout that activates automatically when the TMR pin is tied to V1. No external capacitor or resistor is required. For different timeouts, connect a capacitor from TMR to GND (9.4ms/nF scaling); leaving TMR open yields ~400µs. The internal option simplifies BOM and improves timing consistency across temperature.

What is the purpose of the TMR pin's latch function on the LTC2911HTS8-5#TRMPBF?

The TMR pin on LTC2911HTS8-5#TRMPBF enables hardware latch mode: pulling TMR to GND freezes the current RST output state (high or low) regardless of V1/V2/ADJ input conditions. This is used for margin testing-e.g., forcing RST low during voltage stress, then releasing TMR to verify system recovery timing and sequencing integrity without unintended resets.