Analog Devices Inc. LTC2911HTS8-3#TRPBF

Overview

LTC2911HTS8-3#TRPBF from Analog Devices (formerly Linear Technology) is a precision triple supply monitor IC with integrated power-fail comparator and latched reset functionality, designed for automotive-grade systems. It monitors V1 = 3.3V (±1.5% threshold accuracy), V2 = 1.2V (±1.5%), and an adjustable ADJ input (500 mV nominal threshold), with internal 200 ms reset timeout and guaranteed operation down to VCC = 0.5 V. Used in engine control units and ADAS domain controllers for reliable power sequencing and early brownout warning.

For engineers reviewing the LTC2911HTS8-3#TRPBF datasheet, LTC2911HTS8-3#TRPBF pinout, LTC2911HTS8-3#TRPBF application, or LTC2911HTS8-3#TRPBF equivalent, key selection criteria include its –40°C to +125°C operating range, TSOT-23-8 package, ±1.5% threshold accuracy over temperature, ultralow 30 µA quiescent current, and configurable PFI-based power-fail signaling with 15 mV hysteresis.

Technical Context

The LTC2911HTS8-3#TRPBF implements three independent voltage comparators-V1 (3.3V), V2 (1.2V), and ADJ (0.5V)-each with tight ±1.5% threshold accuracy across –40°C to +125°C. Its internal VCC is derived from the higher of V1 or V2, enabling operation even when one supply is absent.

A dedicated PFI comparator with 500 mV falling-edge threshold and 15 mV hysteresis drives the open-drain PFO output for early power-fail detection. The TMR pin supports three modes: external capacitor timing (9.4 ms/nF), internal 200 ms timeout (TMR tied to V1), or latch mode (TMR pulled to GND) for margin testing.

Key Specifications

Pinout & Package

Package: 8-lead TSOT-23 (TS8), 3.0 mm × 1.7 mm × 0.8 mm, RoHS-compliant lead-free finish (PBF), thermal resistance θ_JA = 195°C/W.

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 LTC2911HTS8-3#TRPBF delivers integrated triple-rail supervision, automotive-grade temperature support, and power-fail warning in a single TSOT-23-8 device - eliminating board area, BOM count, and timing coordination overhead required by multi-IC solutions.

Availability

LTC2911HTS8-3#TRPBF is available at Aetrix Electronics and suitable for automotive engine control, ADAS domain controllers, infotainment head units, and telematics gateways requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LTC2911HTS8-3#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.

The LTC2911 product line delivers precision power supply monitoring ICs optimized for automotive, industrial, and computing systems demanding high threshold accuracy, wide temperature operation, and robust noise immunity.

FAQ

What is the exact V2 supply threshold voltage for LTC2911HTS8-3#TRPBF?

The LTC2911HTS8-3#TRPBF is the LTC2911-4 variant, specifying a V2 threshold of 1.2 V nominal with –6.5% tolerance. Per the datasheet, the guaranteed threshold range is 1.104 V to 1.140 V over –40°C to +125°C, with ±1.5% accuracy. This value is fixed and not adjustable - unlike the ADJ input, V2 is internally trimmed for 1.2 V monitoring.

Does LTC2911HTS8-3#TRPBF support external reset timeout configuration?

No - the "-3" suffix in LTC2911HTS8-3#TRPBF denotes the internal 200 ms reset timeout option. The TMR pin must be tied to V1 to activate this fixed timeout; connecting a capacitor to TMR has no effect. For external timing, select LTC2911HTS8-1#TRPBF (5 V V2) or other -1 through -5 variants with "no suffix" or "-X" marking indicating external capacitor support.

Can LTC2911HTS8-3#TRPBF monitor a 1.8 V supply on the V2 pin?

No - LTC2911HTS8-3#TRPBF is specifically the LTC2911-4 variant, factory-configured for 1.2 V on V2. To monitor 1.8 V, use LTC2911HTS8-3#TRPBF's sibling part LTC2911HTS8-3#TRPBF (LTC2911-3), which has a fixed 1.8 V V2 threshold. The V2 threshold is hard-coded per variant and cannot be reconfigured in-circuit.

What is the maximum allowable input voltage on the PFI pin of LTC2911HTS8-3#TRPBF?

The absolute maximum rating for the PFI pin is –0.3 V to +2.0 V. Exceeding +2.0 V risks permanent damage. When using a resistive divider to scale a higher supply (e.g., 12 V battery), ensure the divider output never exceeds 2.0 V under worst-case conditions - including load dump transients and temperature drift - and include clamping protection if necessary.

How does the latch feature on the TMR pin function in LTC2911HTS8-3#TRPBF?

Pulling the TMR pin to GND latches the current RST state (high or low) regardless of input conditions. Once latched, RST remains frozen until TMR is released (returned to high-impedance or pulled to V1). Upon release, RST resumes normal operation: if all monitored supplies are valid, it transitions high after 200 ms; if any supply is invalid, it asserts low after propagation delay (≤80 µs).