Analog Devices Inc. LTC2911ITS8-4#TRPBF

Overview

LTC2911ITS8-4#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), 1.2V (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 for reliable power-up sequencing in industrial embedded systems.

For engineers reviewing the LTC2911ITS8-4#TRPBF datasheet, LTC2911ITS8-4#TRPBF pinout, LTC2911ITS8-4#TRPBF application, or LTC2911ITS8-4#TRPBF equivalent, key selection criteria include its fixed 1.2V V2 threshold, TSOT-23-8 package footprint, PFI-based early-warning power-fail signaling, and TMR-controlled latch mode for margin testing - all critical for robust system-level power supervision.

Technical Context

The LTC2911ITS8-4#TRPBF implements three independent voltage comparators: one fixed at 3.086V (V1, –6.5% of 3.3V), one fixed at 1.122V (V2, –6.5% of 1.2V), and one adjustable via external resistor divider on ADJ with 500mV nominal threshold. All comparators feature 1.5% accuracy across temperature and built-in glitch filtering.

Its power-fail function uses the PFI input (500mV falling / 515mV rising threshold) to drive PFO low before monitored supplies collapse, enabling controlled shutdown. The TMR pin supports three modes: external capacitor timing, internal 200ms timeout (TMR = V1), or latch (TMR = GND) to hold RST state during voltage margining.

Key Specifications

Pinout & Package

Package: 8-Lead TSOT-23 (TS8), 3mm × 1.75mm footprint, exposed pad optional, θJA = 195°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6324US29D3+T and TPS3808G33DBVR, the LTC2911ITS8-4#TRPBF delivers integrated triple-supply supervision, programmable power-fail warning, and latch-enabled margin testing in a single TSOT-23-8 package - reducing BOM count, PCB area, and validation effort for complex multi-rail systems.

Availability

LTC2911ITS8-4#TRPBF is available at Aetrix Electronics and suitable for industrial PLCs, automotive infotainment systems, and medical sensor hubs requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.

Supply support for LTC2911ITS8-4#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.

The LTC2911 family was designed specifically for precision multi-rail power supervision in space-constrained, reliability-critical applications - emphasizing ±1.5% threshold accuracy, ultra-low quiescent current, and robust noise immunity.

FAQ

What is the exact V2 supply threshold for LTC2911ITS8-4#TRPBF?

The LTC2911ITS8-4#TRPBF has a fixed V2 threshold of 1.122V ±1.5%, corresponding to –6.5% of a nominal 1.2V supply. This value is guaranteed over the full –40°C to 85°C operating temperature range and is specified in the Electrical Characteristics table under VRT12 parameter. It enables precise undervoltage detection for modern low-voltage logic rails without external calibration.

How does the PFI input function in LTC2911ITS8-4#TRPBF?

The PFI input in LTC2911ITS8-4#TRPBF serves as a dedicated power-fail monitor with a 500mV falling-edge threshold and 515mV rising-edge threshold, providing 3% hysteresis. When the voltage at PFI drops below 500mV (typically via a resistive divider from a primary supply), the PFO output pulls low to signal imminent power failure - enabling early system response before V1/V2/ADJ thresholds are violated. This behavior is fully documented in the Applications Information section.

Can LTC2911ITS8-4#TRPBF operate with VCC below 1V?

Yes, LTC2911ITS8-4#TRPBF guarantees functional RST and PFO output operation down to VCC = 0.5V, as confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables. Its proprietary low-voltage drive circuitry maintains valid logic levels during deep brown-out conditions, preventing indeterminate states in downstream processors - a key differentiator versus standard supervisors that require ≥1.2V VCC.

What package type is used for LTC2911ITS8-4#TRPBF?

LTC2911ITS8-4#TRPBF uses the 8-Lead Plastic TSOT-23 (TS8) package, measuring 3mm × 1.75mm with a 0.65mm pitch. Pin configuration matches the standard TSOT-23 layout shown in the Pin Configuration diagram, and thermal resistance is θJA = 195°C/W. This compact footprint supports high-density PCB layouts in space-constrained applications like portable medical devices and telecom modules.

How is reset timeout configured on LTC2911ITS8-4#TRPBF?

Reset timeout on LTC2911ITS8-4#TRPBF is configured via the TMR pin: tying TMR to V1 selects the internal 200ms timeout; connecting a capacitor (e.g., 2.2nF) from TMR to GND yields ~20ms; leaving TMR open gives ~400µs. The relationship is CTMR ≈ tRST × 106.5 pF/ms. All modes are validated in the Electrical Characteristics table under tRST(INT) and tRST(EXT) parameters.