Analog Devices Inc. LTC2919CMS-3.3#PBF

Overview

LTC2919CMS-3.3#PBF from Analog Devices is a precision triple-input UV/OV monitor IC for 3.3V system supply supervision, featuring two adjustable 0.5V-threshold inputs with ±1.5% accuracy over temperature, a dedicated 3.3V VCC UVLO input (2.871V threshold), open-drain RST/OUT1/OUT2 outputs, and internal 200ms reset timeout. It supports positive/negative polarity selection via three-state SEL pin and operates down to 0.5V VCC.

For engineers reviewing the LTC2919CMS-3.3#PBF datasheet, LTC2919CMS-3.3#PBF pinout, LTC2919CMS-3.3#PBF application, or LTC2919CMS-3.3#PBF equivalent, this device delivers verified 3.3V logic-compatible reset timing, buffered 1V reference for negative rail offset, 50µA quiescent current, and AEC-Q100-compliant operation in automotive and industrial power monitoring designs.

Technical Context

The LTC2919CMS-3.3#PBF implements dual comparator-based monitoring with independent ADJ1/ADJ2 inputs (0.5V nominal threshold, ±1.5% accuracy), a third fixed VCC UVLO input calibrated for 3.3V supplies (2.871V min, 2.970V max), and glitch-filtered propagation delay (50–800µs). Its three-state SEL pin configures polarity combinations without external components.

Reset behavior is governed by a configurable timeout: internal 200ms timer (TMR = GND), external capacitor (9ms/nF), or disabled (TMR = VCC). All outputs (RST, OUT1, OUT2) are open-drain, guaranteed low at VCC ≥ 0.5V, and support pull-up voltages above VCC. The buffered 1V REF output sources/sinks ±1mA and drives ≤1000pF loads.

Key Specifications

Pinout & Package

Package: 10-Lead Plastic MSOP (LTDMT marking), 3mm × 3mm body, exposed pad optional for thermal enhancement.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326US33D3+ and TPS3808G33DBVR, the LTC2919CMS-3.3#PBF uniquely integrates dual adjustable inputs, polarity selection, and 1V REF in a single MSOP package - enabling compact, flexible supervision of complex multi-rail systems without external components.

Availability

LTC2919CMS-3.3#PBF is available at Aetrix Electronics and suitable for desktop computing, industrial I/O modules, and network server power sequencing requiring stable component supply, long-term lifecycle support, and commercial-temperature grade reliability.

Supply support for LTC2919CMS-3.3#PBF 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets with precision power management solutions.

The LTC2919 product line delivers highly accurate, low-power, multi-rail voltage supervision ICs designed for mission-critical power sequencing in computing, networking, and automotive electronics where reliability and timing determinism are essential.

FAQ

What is the exact VCC UVLO threshold for LTC2919CMS-3.3#PBF?

The LTC2919CMS-3.3#PBF has a guaranteed VCC UVLO threshold of 2.871V (min) to 2.970V (max) over its 0°C to 70°C operating range, corresponding to −10% of 3.3V with ±1.5% accuracy. This ensures robust detection of 3.3V supply undervoltage without false triggering during normal tolerance excursions.

Can LTC2919CMS-3.3#PBF monitor negative voltages?

Yes - the LTC2919CMS-3.3#PBF supports negative voltage monitoring via its adjustable ADJ1 and ADJ2 inputs when configured with SEL = GND (both inputs negative polarity) or SEL = OPEN (one positive, one negative). The buffered 1V REF output provides the necessary offset for interfacing with negative rails.

How does the reset timeout work on LTC2919CMS-3.3#PBF?

The LTC2919CMS-3.3#PBF offers three reset timeout modes: internal 200ms timer (TMR = GND), external capacitor (9ms/nF, CTMR to GND), or disabled comparator mode (TMR = VCC). The internal timeout eliminates external components and guarantees deterministic release timing after all monitored supplies stabilize.

Is LTC2919CMS-3.3#PBF pin-compatible with other LTC2919 variants?

No - LTC2919CMS-3.3#PBF shares identical pinout and functionality with all LTC2919-3.3 variants (e.g., LTC2919IMS-3.3#PBF), but differs from LTC2919-2.5 and LTC2919-5 versions in VCC UVLO threshold calibration. The MSOP package is mechanically distinct from DFN variants despite identical pin numbering.

What is the maximum load the REF pin can drive on LTC2919CMS-3.3#PBF?

The REF pin on LTC2919CMS-3.3#PBF can source or sink up to ±1mA while maintaining 0.985V to 1.015V output voltage across temperature. It supports capacitive loads up to 1000pF; larger capacitances may degrade transient response and are not recommended without characterization.