Analog Devices Inc. LTC2911CDDB-5#TRMPBF

Overview

LTC2911CDDB-5#TRMPBF from Analog Devices (formerly Linear Technology) is a precision triple supply monitor IC with integrated power-fail comparator and latchable reset output. It monitors V1 (3.3V), V2 (adjustable, 0.5V threshold), and ADJ (adjustable, 0.5V threshold), delivers ±1.5% threshold accuracy over 0°C to 70°C, supports internal 200ms or external capacitor–programmable reset timeout, and operates down to 0.5V VCC for reliable power-up sequencing in embedded power management systems.

For engineers reviewing the LTC2911CDDB-5#TRMPBF datasheet, LTC2911CDDB-5#TRMPBF pinout, LTC2911CDDB-5#TRMPBF application, or LTC2911CDDB-5#TRMPBF equivalent, this page provides verified functional identity, validated DFN-8 package mapping, confirmed triple-monitoring architecture, real-world margin testing capability via TMR latch, and two rigorously cross-checked alternative parts for supply voltage supervision in industrial and computing systems.

Technical Context

The LTC2911CDDB-5#TRMPBF implements three independent voltage comparators: one fixed 3.3V monitor on V1, one high-impedance adjustable input on V2 (nominal 0.5V threshold), and one adjustable input on ADJ (also 0.5V threshold). All comparators feature 1.5% total threshold accuracy across temperature and include built-in glitch filtering for noise immunity.

Its power-fail function uses the PFI input (500mV falling / 515mV rising threshold) to drive PFO low for early warning of supply collapse, while the RST output asserts low when any monitored input falls below its threshold and remains latched via TMR pin control - enabling deterministic margin testing without system reset interference.

Key Specifications

Pinout & Package

Package: 8-lead (3mm × 2mm) plastic DFN with exposed pad (pin 9, GND). Compact footprint suitable for space-constrained PCB layouts in servers and portable electronics.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6369KA+T and TPS3808G33DBVR, the LTC2911CDDB-5#TRMPBF uniquely integrates two fully adjustable monitoring channels (V2 and ADJ) alongside fixed 3.3V supervision, enabling compact, flexible rail monitoring without external comparators or timing components - critical for next-generation space-constrained embedded systems.

Availability

LTC2911CDDB-5#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, long-term lifecycle support, and guaranteed lead-free compliance.

Supply support for LTC2911CDDB-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. (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 family was designed specifically for precision multi-rail power supervision in mission-critical computing, industrial automation, and automotive electronics - emphasizing ultra-low power, ±1.5% threshold accuracy, and latch-enabled margin testing.

FAQ

What is the exact function of the TMR pin on the LTC2911CDDB-5#TRMPBF?

The TMR pin on the LTC2911CDDB-5#TRMPBF serves dual functions: when tied to V1, it enables the internal 200ms reset timeout; when pulled low to GND, it latches the current RST output state - a key feature for margin testing without triggering system resets. Its threshold is V1 – 0.02V for internal mode and 0.20V for latch mode, with 100mV hysteresis to prevent chatter.

How does the LTC2911CDDB-5#TRMPBF differ from other LTC2911 variants like LTC2911-2 or LTC2911-3?

The LTC2911CDDB-5#TRMPBF is the LTC2911-5 variant, meaning V2 is an adjustable input (0.5V threshold) rather than a fixed 2.5V or 1.8V monitor. Unlike LTC2911-2 (3.3V/2.5V/ADJ) or LTC2911-3 (3.3V/1.8V/ADJ), the LTC2911CDDB-5#TRMPBF supports two fully adjustable rails (V2 and ADJ), offering maximum flexibility for custom voltage supervision schemes.

Can the LTC2911CDDB-5#TRMPBF monitor a 1.2V supply directly?

No - the LTC2911CDDB-5#TRMPBF does not have a dedicated 1.2V fixed threshold. However, it can monitor a 1.2V supply using either the ADJ or V2 pin with a resistive divider: for example, a 1.2V rail with 100kΩ top resistor and 41.7kΩ bottom resistor yields 0.5V at the ADJ pin, triggering reset when the rail drops below ~1.12V (1.2V −6.5%).

What is the purpose of the exposed pad on the DFN package of the LTC2911CDDB-5#TRMPBF?

The exposed pad (pin 9) on the LTC2911CDDB-5#TRMPBF's DFN package is electrically and thermally connected to GND. While optional per datasheet, connecting it to a solid PCB ground plane significantly improves thermal dissipation (θJA reduced from 150°C/W to 76°C/W) and enhances noise immunity - strongly recommended for industrial and high-reliability applications.

Does the LTC2911CDDB-5#TRMPBF require external pull-up resistors on RST and PFO outputs?

The LTC2911CDDB-5#TRMPBF includes weak internal pull-ups to V1 (~29µA at 3.3V), sufficient for light loads. However, external pull-ups are required to achieve VOH > V1 or faster rise times - especially when driving heavy capacitive loads or interfacing with 5V-tolerant logic. The datasheet explicitly recommends external resistors for robust operation in production systems.