Analog Devices Inc. LTC2911IDDB-1#TRMPBF

Overview

LTC2911IDDB-1#TRMPBF from Analog Devices (acquired Linear Technology) is a precision triple supply monitor IC with power-fail comparator, designed for system-level voltage supervision in embedded and industrial electronics. It monitors 3.3V (V1), 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 reliable reset assertion during brownout conditions in DC/DC-powered systems.

For engineers reviewing the LTC2911IDDB-1#TRMPBF datasheet, LTC2911IDDB-1#TRMPBF pinout, LTC2911IDDB-1#TRMPBF application, or LTC2911IDDB-1#TRMPBF equivalent, key selection criteria include its fixed 3.3V/5V dual-supply monitoring configuration, DFN-8 (3mm × 2mm) package with exposed pad, PFI-based early power-fail warning capability, and latch-enabled margin testing support.

Technical Context

The LTC2911IDDB-1#TRMPBF implements three independent comparators: one for 3.3V (V1, nominal 3.086V threshold), one for 5V (V2, nominal 4.675V threshold), and one for adjustable input (ADJ, 500mV threshold). All comparators feature 1.5% accuracy across temperature and integrated glitch filtering for noise immunity.

Its power-fail function uses the PFI input (500mV falling / 515mV rising threshold) to drive PFO low before monitored supplies collapse, while the TMR pin enables latched RST state for margin testing or configurable timeout via external capacitor or internal 200ms generator.

Key Specifications

Pinout & Package

Package: 8-lead (3mm × 2mm) plastic DFN with exposed pad (pin 9), rated TJMAX = 150°C, θJA = 76°C/W. Exposed pad may be left open or connected to GND for thermal and electrical stability.

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 LTC2911IDDB-1#TRMPBF uniquely integrates triple-supply monitoring, PFI-based early warning, and 0.5V operation - making it the only option capable of full-system supervision with brownout resilience in space-constrained DFN-8 layouts.

Availability

LTC2911IDDB-1#TRMPBF is available at Aetrix Electronics and suitable for server power sequencing, industrial PLC I/O modules, automotive infotainment head units, and battery-powered medical sensors requiring stable component supply across extended temperature ranges.

Supply support for LTC2911IDDB-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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through acquisition of Linear Technology in 2017.

The LTC2911 family was developed by Linear Technology specifically for precision multi-rail voltage supervision in mission-critical computing, industrial automation, and automotive electronics - emphasizing accuracy, low power, and robustness under voltage transients.

FAQ

What is the exact reset threshold voltage for V1 and V2 on the LTC2911IDDB-1#TRMPBF?

The LTC2911IDDB-1#TRMPBF has a guaranteed V1 reset threshold of 3.036V to 3.135V (3.086V typical) and V2 threshold of 4.600V to 4.750V (4.675V typical), both with ±1.5% accuracy over –40°C to 85°C. These values correspond to –6.5% of nominal 3.3V and 5V supplies, ensuring reliable undervoltage detection before system malfunction occurs.

Does the LTC2911IDDB-1#TRMPBF support power-fail warning for supplies other than the main 5V rail?

Yes - the LTC2911IDDB-1#TRMPBF uses the dedicated PFI input with 500mV threshold to monitor any supply via an external resistive divider. For example, PFI can supervise a 12V battery stack (using 24kΩ/1kΩ divider) or a 24V field bus, asserting PFO low to trigger early shutdown before V1/V2 collapse.

How does the TMR pin function in latch mode on the LTC2911IDDB-1#TRMPBF?

When the TMR pin of the LTC2911IDDB-1#TRMPBF is pulled to GND, the current RST state (high or low) is latched and held regardless of subsequent V1/V2/ADJ voltage changes. Releasing TMR restores normal monitoring after tSU,MON setup time (2ms), allowing precise margin testing at reduced supply voltages without unintended resets.

Can the LTC2911IDDB-1#TRMPBF operate with only one supply connected?

Yes - the LTC2911IDDB-1#TRMPBF derives internal VCC from the higher of V1 or V2. If only V1 (3.3V) is present, it powers the device and enables monitoring of V1 and ADJ inputs. V2 and PFI remain functional but require external biasing; unused inputs should be tied to V1 or GND per datasheet guidance.

What is the maximum allowable leakage current for the external capacitor on the TMR pin of the LTC2911IDDB-1#TRMPBF?

The external capacitor on the TMR pin of the LTC2911IDDB-1#TRMPBF must exhibit leakage current ≤500nA to maintain timer accuracy. Ceramic capacitors (e.g., X7R, C0G) are recommended; electrolytic or high-leakage film types will cause significant timeout drift or failure to assert RST correctly.