Analog Devices Inc. LTC2919CDDB-5#TRMPBF

Overview

LTC2919CDDB-5#TRMPBF from Analog Devices is a precision triple-input supply monitor IC for 5V system supervision, featuring two adjustable 0.5V-threshold inputs (±1.5% accuracy over 0°C to 70°C), a dedicated 5V VCC UVLO input (4.35V threshold), open-drain RST/OUT1/OUT2 outputs, and pin-selectable polarity for UV/OV monitoring of positive or negative rails. It enables robust power-up/brownout detection in space-constrained embedded systems.

For engineers reviewing the LTC2919CDDB-5#TRMPBF datasheet, LTC2919CDDB-5#TRMPBF pinout, LTC2919CDDB-5#TRMPBF application, or LTC2919CDDB-5#TRMPBF equivalent, key selection criteria include its ±1.5% threshold accuracy across temperature, 50µA quiescent current, 200ms internal reset timeout, 10-lead 3mm × 2mm DFN package, and support for dual-polarity monitoring via the three-state SEL pin.

Technical Context

The LTC2919CDDB-5#TRMPBF implements dual independent voltage comparators with 0.5V nominal thresholds and a third comparator monitoring VCC against a fixed –10% UVLO (4.35V for 5V operation). Its SEL pin decodes three polarity configurations-positive/positive, positive/negative, or negative/negative-enabling flexible UV/OV fault detection on mixed-rail systems without external components.

Reset assertion is synchronized across all monitored inputs: RST remains low until both ADJ inputs are valid *and* VCC exceeds its UVLO threshold for the full timeout period (200ms internal, capacitor-programmable, or disabled). Glitch filtering at each comparator input and propagation delay hysteresis (50–800µs) prevent false triggering from transient noise.

Key Specifications

Pinout & Package

Package: 10-lead 3mm × 2mm plastic DFN (DDB) with exposed pad (Pin 11), RoHS-compliant, rated for 150°C max junction temperature.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G50DBVR and MAX6816EUT+T, the LTC2919CDDB-5#TRMPBF delivers integrated triple monitoring (dual adjustable + fixed 5V), pin-configurable polarity, and a buffered 1V reference-reducing component count and PCB area while enabling flexible fault detection across positive and negative rails in a single 3mm × 2mm DFN package.

Availability

LTC2919CDDB-5#TRMPBF is available at Aetrix Electronics and suitable for desktop computing, industrial PLCs, automotive infotainment, and network server applications requiring stable component supply and guaranteed C-grade temperature performance.

Supply support for LTC2919CDDB-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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, communications, and automotive markets.

The LTC2919 product line delivers highly accurate, low-power, multi-rail voltage supervisors with configurable polarity and integrated timing-designed for reliability-critical power sequencing in space-constrained commercial and industrial systems.

FAQ

What is the exact VCC undervoltage threshold for LTC2919CDDB-5#TRMPBF?

The LTC2919CDDB-5#TRMPBF has a fixed VCC UVLO threshold of 4.35V (–10% of 5V nominal), with ±1.5% accuracy over its 0°C to 70°C operating range. This value is factory-trimmed and does not require external configuration; it is specified in the Electrical Characteristics table under VCC(UVLO) for the -5 variant.

How does the SEL pin configure polarity for ADJ1 and ADJ2 on LTC2919CDDB-5#TRMPBF?

On the LTC2919CDDB-5#TRMPBF, the SEL pin selects polarity combinations: tied to VCC sets both ADJ1 and ADJ2 for positive-rail UV detection; left open configures ADJ1 for positive UV and ADJ2 for negative OV; tied to GND sets both for negative-rail UV detection. These states are defined in Table 1 of the datasheet and require no external components.

Can LTC2919CDDB-5#TRMPBF monitor a –5V supply, and how is it implemented?

Yes, the LTC2919CDDB-5#TRMPBF can monitor a –5V supply using ADJ1 or ADJ2 in negative polarity mode. The REF pin provides a 1.000V buffered output; a resistor divider between –5V and REF sets the ADJ input to 0.5V when the rail is at nominal –5V, enabling precise –5V UV detection. SEL must be configured accordingly (e.g., SEL = GND).

What is the reset timeout behavior of LTC2919CDDB-5#TRMPBF when TMR is grounded?

When TMR is grounded on the LTC2919CDDB-5#TRMPBF, the device uses its internal 200ms timer for reset timeout. RST remains low for exactly 200ms after all monitored inputs (both ADJx and VCC) exceed their respective thresholds, ensuring deterministic release timing without external capacitors.

Does LTC2919CDDB-5#TRMPBF support operation from a 12V supply, and what is required?

Yes, the LTC2919CDDB-5#TRMPBF supports 12V operation via its internal 6.5V shunt regulator on the VCC pin. A series current-limiting resistor (RCC) must be added between the 12V source and VCC to limit input current to ≤10mA. For a 12V supply, RCC ≈ 560Ω–1kΩ ensures safe operation while maintaining regulation.