Analog Devices Inc. LTC2911HTS8-1#TRMPBF

Overview

LTC2911HTS8-1#TRMPBF from Analog Devices (formerly Linear Technology) is a high-accuracy triple supply monitor IC with integrated power-fail comparator and latched reset control. It monitors 3.3V (V1), 5V (V2), and an adjustable threshold (ADJ) with ±1.5% threshold accuracy over –40°C to +125°C, supports internal 200ms reset timeout, and delivers ultralow-voltage operation down to VCC = 0.5V - used in automotive engine control units for multi-rail power integrity validation.

For engineers reviewing the LTC2911HTS8-1#TRMPBF datasheet, LTC2911HTS8-1#TRMPBF pinout, LTC2911HTS8-1#TRMPBF application, or LTC2911HTS8-1#TRMPBF equivalent, key selection criteria include its H-grade automotive temperature range, TSOT-23-8 package footprint, triple-supply monitoring capability with independent PFI power-fail warning, and TMR latch functionality for margin testing under controlled voltage stress.

Technical Context

The LTC2911HTS8-1#TRMPBF implements three independent voltage comparators: V1 fixed at 3.3V (–6.5% trip = 3.086V), V2 fixed at 5V (–6.5% trip = 4.675V), and ADJ with 500mV nominal threshold configurable via resistive divider. All comparators feature 1.5% threshold accuracy across –40°C to +125°C and built-in glitch filtering for noise immunity.

Its power-fail function uses the PFI input (500mV falling / 515mV rising threshold, 3% hysteresis) to drive PFO low before monitored supplies collapse, enabling early shutdown sequencing. The TMR pin supports three modes: external capacitor timeout (9.4 ms/nF), internal 200ms timeout (TMR tied to V1), or latch mode (TMR pulled to GND) to hold RST state during margin testing.

Key Specifications

Pinout & Package

Package: 8-lead 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 LTC2911HTS8-1#TRMPBF uniquely combines triple-supply monitoring, programmable power-fail warning, ±1.5% accuracy, and latch-enabled margin testing - making it the only option supporting full automotive ASIL-B-compliant power integrity validation in a single TSOT-23 package.

Availability

LTC2911HTS8-1#TRMPBF is available at Aetrix Electronics and suitable for automotive ECU designs, industrial PLC power management, network server baseboard management, and medical diagnostic imaging systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LTC2911HTS8-1#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, 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 delivers precision power-monitoring ICs optimized for automotive, industrial, and computing applications where reliability, accuracy, and multi-rail supervision are critical - designed specifically to replace discrete comparator-based solutions with integrated, temperature-stable alternatives.

FAQ

What is the operating temperature range for the LTC2911HTS8-1#TRMPBF?

The LTC2911HTS8-1#TRMPBF is rated for –40°C to +125°C (H-grade), qualified for automotive under-hood applications and high-reliability industrial environments. This range is validated per AEC-Q100 stress testing and guarantees ±1.5% threshold accuracy across the full span, unlike commercial-grade variants limited to 0°C–70°C.

How does the PFI input function in the LTC2911HTS8-1#TRMPBF?

The PFI input in the LTC2911HTS8-1#TRMPBF monitors an external voltage via a resistive divider and compares it to a 500mV falling / 515mV rising threshold. When PFI falls below 500mV, PFO pulls low to provide early warning of impending power failure - enabling controlled shutdown before V1/V2/ADJ trip and assert RST.

Can the LTC2911HTS8-1#TRMPBF monitor a 1.2V supply?

No - the LTC2911HTS8-1#TRMPBF is the -1 variant, configured specifically for 3.3V (V1) and 5V (V2) monitoring. To supervise 1.2V, use LTC2911HTS8-4#TRMPBF (V2 = 1.2V). The ADJ pin can monitor lower voltages via resistor divider, but V2 itself is fixed at 5V for this part number.

What is the purpose of the TMR pin on the LTC2911HTS8-1#TRMPBF?

The TMR pin on the LTC2911HTS8-1#TRMPBF controls reset timeout and latch behavior: tying it to V1 enables the internal 200ms timeout; connecting it to GND latches RST in its current state for margin testing; and attaching CTMR to GND sets external timeout (9.4 ms/nF). It does not support PWM or analog control.

Does the LTC2911HTS8-1#TRMPBF require external pull-up resistors on RST and PFO?

The LTC2911HTS8-1#TRMPBF provides internal weak pull-ups to V1 (~29µA at 3.3V), sufficient for most logic interfaces. External pull-ups are recommended only when VOH > V1 is needed (e.g., interfacing to 5V logic) or faster rise times are required - not for basic CMOS input driving.