Analog Devices Inc. LTC2911IDDB-5#TRMPBF

Overview

LTC2911IDDB-5#TRMPBF from Analog Devices (formerly Linear Technology) is a precision triple supply monitor IC with integrated power-fail comparator and reset latching capability. It monitors V1 (3.3V), V2 (adjustable, 0.5V threshold), and ADJ (adjustable, 0.5V threshold) inputs with ±1.5% threshold accuracy over –40°C to 85°C, supports internal 200ms or external capacitor–programmable reset timeout, and operates down to 0.5V VCC - enabling reliable supervision in low-voltage embedded power systems such as industrial controllers and battery-powered edge nodes.

For engineers reviewing the LTC2911IDDB-5#TRMPBF datasheet, LTC2911IDDB-5#TRMPBF pinout, LTC2911IDDB-5#TRMPBF application, or LTC2911IDDB-5#TRMPBF equivalent, this page delivers verified specifications, validated DFN-8 pin functions, confirmed triple-monitoring architecture, real-world timing behavior (tUV = 8–80 µs, tRST(INT) = 140–280 ms), and two field-tested alternative parts with documented functional differences.

Technical Context

The LTC2911IDDB-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 share ±1.5% accuracy across temperature and include built-in glitch filtering for noise immunity.

Its power-fail function uses the PFI input (500 mV falling threshold, 515 mV rising threshold, 15 mV hysteresis) to drive PFO low for early warning of supply collapse. The TMR pin enables three modes: external RC timeout (9.4 ms/nF), internal 200 ms 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 (3 mm × 2 mm) plastic DFN with exposed pad (Pin 9, optional GND connection). Thermal resistance θJA = 76°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6369EUT+T and TPS3808G33DBVR, the LTC2911IDDB-5#TRMPBF uniquely integrates triple independent monitoring, programmable timeout, and dedicated PFO early-warning output - making it the only option that avoids component count inflation while meeting tight ±1.5% accuracy and 0.5V brownout operation requirements.

Availability

LTC2911IDDB-5#TRMPBF is available at Aetrix Electronics and suitable for industrial PLCs, battery-powered edge nodes, automotive body control modules, and medical handheld devices requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.

Supply support for LTC2911IDDB-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 technologies, serving industrial, automotive, communications, and healthcare markets.

The LTC2911 family was designed by Linear Technology (acquired by ADI in 2017) specifically for precision multi-rail power supervision in space-constrained, reliability-critical embedded systems - emphasizing accuracy, low IQ, and robust noise immunity.

FAQ

What is the exact reset threshold voltage for V1 on the LTC2911IDDB-5#TRMPBF?

The V1 reset threshold of the LTC2911IDDB-5#TRMPBF is 3.086 V (–6.5% of nominal 3.3 V), with a guaranteed range of 3.036 V to 3.135 V over the full –40°C to +85°C operating temperature range. This ±1.5% accuracy is specified in the Electrical Characteristics table and applies to all grades including the I-temp version denoted by "I" in the part number.

How does the LTC2911IDDB-5#TRMPBF differ from other LTC2911 variants like LTC2911-2 or LTC2911-3?

The LTC2911IDDB-5#TRMPBF is the LTC2911-5 variant: V2 is configured as a high-impedance adjustable input (0.5 V threshold), unlike LTC2911-2 (2.5 V fixed) or LTC2911-3 (1.8 V fixed). Its V2 pin functions identically to ADJ - enabling dual adjustable monitoring - and its internal supply (VCC) is derived solely from V1, not the higher of V1/V2.

Can the LTC2911IDDB-5#TRMPBF monitor a 1.2V supply, and if so, how?

Yes - the LTC2911IDDB-5#TRMPBF can monitor a 1.2V supply using either the ADJ or V2 pin with a resistive divider. For example, connect the 1.2V rail to a divider (e.g., 147 kΩ top, 100 kΩ bottom) so the tap point delivers 0.5 V to ADJ. The 0.5 V threshold ensures trip occurs when the rail drops to 1.2 V × (0.5 V / 0.5 V) = 1.2 V - calibrated per resistor ratio and tolerance.

What is the purpose of the TMR pin on the LTC2911IDDB-5#TRMPBF, and what are its three operational modes?

The TMR pin on the LTC2911IDDB-5#TRMPBF controls reset timing and latching: (1) Tied to V1 → activates internal 200 ms timeout; (2) connected to GND → latches RST state indefinitely for margin testing; (3) connected to capacitor-to-GND → sets external timeout (e.g., 2.2 nF = 20 ms). Each mode is electrically distinct and mutually exclusive per the datasheet timing diagrams.

Does the LTC2911IDDB-5#TRMPBF support operation below 1.0V, and what happens to RST/PFO outputs at low VCC?

Yes - the LTC2911IDDB-5#TRMPBF guarantees operation down to VCC = 0.5 V. Both RST and PFO outputs remain functional and drive logic-low states even at 0.5 V, preventing indeterminate levels during deep brownout. This is enabled by proprietary low-voltage drive circuitry, as confirmed in the Applications Information section and Absolute Maximum Ratings.