Analog Devices Inc. LTC2911CDDB-4#TRMPBF

Overview

LTC2911CDDB-4#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 3.3V (V1), 1.2V (V2), and an adjustable input (ADJ) with ±1.5% threshold accuracy over 0°C to 70°C, supports internal 200ms reset timeout, and operates down to 0.5V VCC for reliable power-up sequencing in embedded power management systems.

For engineers reviewing the LTC2911CDDB-4#TRMPBF datasheet, LTC2911CDDB-4#TRMPBF pinout, LTC2911CDDB-4#TRMPBF application, or LTC2911CDDB-4#TRMPBF equivalent, key selection criteria include its fixed 1.2V V2 threshold, DFN-8 (3mm × 2mm) package, 30µA quiescent current, PFI-based early-warning power-fail signaling, and TMR-controlled reset latching for margin testing.

Technical Context

The LTC2911CDDB-4#TRMPBF implements three independent voltage comparators: V1 (3.3V, –6.5% trip), V2 (1.2V, –6.5% trip per LTC2911-4 variant), and ADJ (0.5V nominal threshold). Its internal VCC is derived from the higher of V1 or V2, enabling operation even when one supply is absent.

It integrates a dedicated power-fail comparator (PFI/PFO) with 500mV falling-edge threshold and 15mV hysteresis, plus a programmable reset timeout via TMR pin-selectable between internal 200ms mode (TMR = V1) or external capacitor timing (e.g., 2.2nF → 20ms). The RST output features glitch-immune undervoltage detection with 8–80µs propagation delay.

Key Specifications

Pinout & Package

Package: 8-Lead (3mm × 2mm) Plastic DFN (DDB), exposed pad (Pin 9) connected to GND.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6816EUT+T and TPS3808G33DBVR, the LTC2911CDDB-4#TRMPBF uniquely delivers simultaneous 3.3V/1.2V/adjustable monitoring with integrated power-fail warning and latchable reset-enabling robust, space-efficient supervision of complex multi-rail systems where coordinated sequencing and early fault detection are mandatory.

Availability

LTC2911CDDB-4#TRMPBF is available at Aetrix Electronics and suitable for server power sequencing, industrial PLC I/O modules, automotive infotainment head units, and medical diagnostic imaging subsystems requiring stable component supply and long-term lifecycle support.

Supply support for LTC2911CDDB-4#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 family was designed specifically for precision multi-rail power supply monitoring in space-constrained, high-reliability systems-emphasizing ultra-low quiescent current, tight threshold accuracy, and integrated power-fail warning capability.

FAQ

What is the exact V2 threshold voltage for LTC2911CDDB-4#TRMPBF?

The LTC2911CDDB-4#TRMPBF has a fixed V2 threshold of 1.122V ±1.5%, corresponding to the –6.5% trip point for a nominal 1.2V supply as defined in the LTC2911-4 variant specification. This value is guaranteed over the full 0°C to 70°C operating temperature range and is independent of external components.

How does the TMR pin function in LTC2911CDDB-4#TRMPBF for reset control?

In LTC2911CDDB-4#TRMPBF, the TMR pin serves dual functions: tying it to V1 enables the internal 200ms reset timeout, while pulling it low latches the RST output state indefinitely-enabling margin testing without spurious resets. Releasing TMR restores normal monitoring after setup/hold timing requirements are met.

Can LTC2911CDDB-4#TRMPBF monitor a 5V supply directly on the V2 pin?

No. The LTC2911CDDB-4#TRMPBF is the LTC2911-4 variant, which configures V2 exclusively for 1.2V monitoring (1.122V threshold). To monitor 5V, use LTC2911CDDB-1#TRMPBF (V2 = 4.675V threshold) or route the 5V rail through a resistive divider to the ADJ pin.

What is the minimum operating voltage that guarantees RST and PFO functionality in LTC2911CDDB-4#TRMPBF?

The LTC2911CDDB-4#TRMPBF guarantees RST and PFO output operation down to VCC = 0.5V, enabled by proprietary low-voltage drive circuitry. Since VCC is derived from the higher of V1 or V2, this means either supply must remain ≥0.5V for valid logic-level outputs during brownout conditions.

Does LTC2911CDDB-4#TRMPBF require external pull-up resistors on RST and PFO pins?

LTC2911CDDB-4#TRMPBF provides weak internal pull-ups to V1 (typically 29µA at V1 = 3.3V), sufficient for most CMOS inputs. External pull-ups are recommended only when faster rise times or VOH > V1 are required-e.g., interfacing with 5V-tolerant logic or driving heavy capacitive loads.