Analog Devices Inc. LTC2919IMS-3.3#PBF

Overview

LTC2919IMS-3.3#PBF from Analog Devices is a precision triple-input voltage supervisor IC for system power monitoring, featuring two 0.5V adjustable UV/OV inputs with ±1.5% threshold accuracy over –40°C to +85°C, a dedicated 3.3V VCC UVLO monitor (2.871V–2.970V), open-drain RST/OUT1/OUT2 outputs, and configurable reset timeout via TMR pin. It enables robust fault detection in multi-rail embedded systems.

For engineers reviewing the LTC2919IMS-3.3#PBF datasheet, LTC2919IMS-3.3#PBF pinout, LTC2919IMS-3.3#PBF application, or LTC2919IMS-3.3#PBF equivalent, this page delivers verified specifications, polarity-selectable dual-input monitoring logic, internal 200ms reset timeout behavior, buffered 1V reference for negative rail offset, and MSOP-10 package layout guidance - all confirmed from Analog Devices' official Rev. A datasheet.

Technical Context

The LTC2919IMS-3.3#PBF implements dual independent comparator-based monitoring channels with user-selectable input polarity (positive/negative UV or OV) via its three-state SEL pin, enabling flexible fault detection across mixed-signature rails. Its third monitoring channel is a fixed –10% UVLO on VCC, calibrated for 3.3V nominal supply (2.871V min, 2.970V max).

Reset assertion is synchronized across all monitored inputs: RST remains low until both ADJ inputs and VCC are valid for the full timeout period (200ms internal, external capacitor-programmable, or disabled). Glitch rejection is achieved through propagation delay filtering (50–800 µs) and no hysteresis outside comparator mode - preserving ±1.5% threshold accuracy without degrading trip-point precision.

Key Specifications

Pinout & Package

Package: 10-Lead Plastic MSOP (3mm × 3mm), exposed pad not present (DFN-only feature), RoHS-compliant lead-free finish.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage supervisor applications.

Compared with MAX6326–33D3+ and TPS3808G33DBVR, the LTC2919IMS-3.3#PBF uniquely integrates triple monitoring (VCC + two ADJ), polarity-selectable inputs, and a buffered 1V reference - enabling compact, accurate supervision of mixed-signature, multi-rail systems without external components.

Availability

LTC2919IMS-3.3#PBF is available at Aetrix Electronics and suitable for industrial PLCs, automotive infotainment systems, and medical imaging equipment requiring stable component supply with guaranteed –40°C to +85°C operation and AEC-Q100-aligned reliability.

Supply support for LTC2919IMS-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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.

The LTC2919IMS-3.3#PBF belongs to Analog Devices' precision voltage supervisor product line, engineered for space-constrained, multi-rail systems demanding ±1.5% threshold accuracy, low quiescent current, and flexible polarity configuration without external components.

FAQ

What is the exact VCC UVLO threshold range for LTC2919IMS-3.3#PBF?

The LTC2919IMS-3.3#PBF has a guaranteed VCC undervoltage lockout threshold of 2.871V to 2.970V over its full operating temperature range (–40°C to +85°C), corresponding to –10% of nominal 3.3V supply with ±0.5% tolerance margin. This specification is explicitly defined in the Electrical Characteristics table under VCC(UVLO) for the -3.3 variant and applies regardless of SEL or TMR configuration.

How does the SEL pin configure polarity for ADJ1 and ADJ2 on LTC2919IMS-3.3#PBF?

On the LTC2919IMS-3.3#PBF, the SEL pin selects polarity combinations: tied to VCC configures both ADJ1 and ADJ2 for positive UV detection; left open configures ADJ1 for positive UV and ADJ2 for negative UV; tied to GND configures both for negative UV. This mapping is defined in Table 1 of the datasheet and requires no external resistors or logic - the internal decode circuitry handles all three states directly.

Can LTC2919IMS-3.3#PBF monitor negative voltages, and how is that implemented?

Yes, the LTC2919IMS-3.3#PBF can monitor negative voltages using its buffered 1V REF output as an offset reference. When SEL is configured for negative polarity, ADJ1 or ADJ2 detects undervoltage when the negative rail exceeds –0.5V (i.e., becomes less negative), enabling –5V or –15V supply monitoring. The REF pin provides the stable 1V bias needed to interface with standard resistor dividers referenced to negative rails.

What are the valid reset timeout options for LTC2919IMS-3.3#PBF, and how are they selected?

The LTC2919IMS-3.3#PBF offers three reset timeout modes: internal 200ms (TMR pin tied to GND), external capacitor-programmed (9ms/nF, CTMR to GND), or disabled/comparator mode (TMR tied to VCC). These are mutually exclusive configurations specified in the Pin Functions section and validated in the Timing Diagram (Figure 2919 TD). No additional enable pins or register writes are required - selection is purely hardware-based.

Is the REF output of LTC2919IMS-3.3#PBF required to have a bypass capacitor?

No, the REF output of LTC2919IMS-3.3#PBF does not require and should not use a bypass capacitor. The datasheet explicitly states "This pin does not require a bypass capacitor, nor is one recommended" due to internal buffering optimized for capacitive loads up to 1000pF. Adding external capacitance beyond this may degrade transient response and cause instability in REF-dependent monitoring circuits.