Analog Devices Inc. LTC2911CDDB-2#TRPBF

Overview

LTC2911CDDB-2#TRPBF from Analog Devices (formerly Linear Technology) is a precision triple supply monitor IC with integrated power-fail comparator and latched reset control. It monitors 3.3V (V1), 2.5V (V2), and an adjustable threshold (ADJ) with ±1.5% 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 systems.

For engineers reviewing the LTC2911CDDB-2#TRPBF datasheet, LTC2911CDDB-2#TRPBF pinout, LTC2911CDDB-2#TRPBF application, or LTC2911CDDB-2#TRPBF equivalent, this page delivers verified functional identity, DFN-8 package mapping, confirmed 8-pin terminal roles, real-world margin testing use cases, and two validated alternative parts with documented technical and application-level differences.

Technical Context

The LTC2911CDDB-2#TRPBF implements three independent voltage comparators - one fixed at 3.086V (V1), one fixed at 2.338V (V2), and one adjustable via external resistor divider referenced to 500mV (ADJ). Its PFI input uses a dedicated 500mV/515mV hysteresis comparator for early power-fail warning, while the TMR pin enables latch mode or internal 200ms timeout selection.

All comparators feature glitch filtering and operate across –0.3V to 6.5V input ranges. The device derives internal VCC from the higher of V1 or V2, draws only 30µA typical quiescent current, and maintains RST/PFO logic low down to 0.5V supply - enabling robust brown-out detection during ramp-up and ramp-down sequences.

Key Specifications

Pinout & Package

Package: 8-lead (3mm × 2mm) plastic DFN with exposed pad (Pin 9 = GND, optional PCB connection).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6369AUT+T and TPS3808G33DBVR, the LTC2911CDDB-2#TRPBF uniquely integrates triple-supply monitoring, programmable power-fail alerting, and latch-enabled margin testing in a single 3mm×2mm DFN - eliminating discrete comparators, timers, and external hysteresis networks required by alternatives.

Availability

LTC2911CDDB-2#TRPBF is available at Aetrix Electronics and suitable for desktop computing, industrial automation, and network infrastructure applications requiring stable component supply, long-term lifecycle support, and guaranteed commercial-temperature performance.

Supply support for LTC2911CDDB-2#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 (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.

The LTC2911 family was designed specifically for high-accuracy, low-power supply monitoring in space-constrained computing and industrial systems - emphasizing ±1.5% threshold stability, sub-1V operation, and integrated power-fail warning capability.

FAQ

What is the exact reset threshold voltage for V1 and V2 on the LTC2911CDDB-2#TRPBF?

The LTC2911CDDB-2#TRPBF has a V1 threshold of 3.086V (3.3V – 6.5%) and a V2 threshold of 2.338V (2.5V – 6.5%), both guaranteed within ±1.5% over 0°C to 70°C. These values correspond to the LTC2911-2 variant designation and are confirmed in the Electrical Characteristics table under VRT33 and VRT25 parameters. The LTC2911CDDB-2#TRPBF does not support other V2 voltages like 1.8V or 1.2V - those require different part numbers (e.g., LTC2911-3 or LTC2911-4).

How does the PFI input function on the LTC2911CDDB-2#TRPBF, and what is its hysteresis?

The PFI input on the LTC2911CDDB-2#TRPBF monitors an external voltage via a resistive divider and compares it to a 500mV falling-edge threshold and 515mV rising-edge threshold, delivering 15mV (3%) hysteresis for noise immunity. When PFI falls below 500mV, PFO pulls low to signal impending power failure - typically 10–100ms before RST asserts. This behavior is intrinsic to the LTC2911CDDB-2#TRPBF and does not require external components beyond the divider resistors.

Can the LTC2911CDDB-2#TRPBF operate with supply voltages below 1V, and what is the minimum guaranteed VCC?

Yes, the LTC2911CDDB-2#TRPBF guarantees full functionality down to VCC = 0.5V, including valid RST and PFO logic levels. Its proprietary low-voltage drive circuitry ensures outputs remain well-defined even as the higher of V1 or V2 drops to 0.5V - a critical capability for brown-out detection during power-up and power-down transitions. This specification is explicitly stated in the Features section and confirmed in the Absolute Maximum Ratings table.

What package type and pin count does the LTC2911CDDB-2#TRPBF use, and is the exposed pad electrically connected?

The LTC2911CDDB-2#TRPBF uses an 8-lead (3mm × 2mm) plastic DFN package with an exposed pad designated as Pin 9. Per the datasheet Pin Configuration diagram and Notes, the exposed pad is electrically connected to GND and may be left unconnected or soldered to the PCB ground plane - either method satisfies thermal and electrical requirements. This DFN package is distinct from the TSOT-23 option (e.g., LTC2911CTS8-2#TRMPBF) and is identified by the "DDB" suffix in the part number.

How is reset timeout configured on the LTC2911CDDB-2#TRPBF, and what are the available options?

Reset timeout on the LTC2911CDDB-2#TRPBF is configured via the TMR pin: tying TMR to V1 selects the internal 200ms timeout (tRST(INT)), while connecting an external capacitor CTMR from TMR to GND sets a custom timeout (tRST(EXT) ≈ 9.4ms/nF). With CTMR = 2.2nF, timeout is 15–27ms. Leaving TMR open yields ~400µs. All timing modes are supported simultaneously on the same LTC2911CDDB-2#TRPBF die - no variant selection is needed.