Analog Devices Inc. LTC2919HDDB-2.5#TRMPBF

Overview

LTC2919HDDB-2.5#TRMPBF from Analog Devices is a precision triple-input voltage supervisor IC designed for automotive and industrial power-rail monitoring. It features two adjustable 0.5V-threshold inputs (±1.5% accuracy over –40°C to +125°C), a fixed 2.5V VCC UVLO monitor, open-drain RST/OUT1/OUT2 outputs, and pin-selectable polarity for UV/OV detection on positive or negative rails - deployed in core supply monitoring for engine control units and ADAS domain controllers.

For engineers reviewing the LTC2919HDDB-2.5#TRMPBF datasheet, LTC2919HDDB-2.5#TRMPBF pinout, LTC2919HDDB-2.5#TRMPBF application, or LTC2919HDDB-2.5#TRMPBF equivalent, key selection criteria include guaranteed ±1.5% threshold accuracy across full automotive temperature range, 50µA quiescent current, 200ms internal reset timeout, buffered 1V reference for negative rail offset, and DFN-10 (3mm × 2mm) AEC-Q100 qualified packaging.

Technical Context

The LTC2919HDDB-2.5#TRMPBF implements dual independent comparator channels with user-configurable input polarity via three-state SEL pin (VCC/GND/open), enabling simultaneous UV/OV monitoring of mixed-polarity supplies. Its third monitoring channel uses the VCC pin's accurate –10% UVLO (2.175V min) to supervise a 2.5V system rail without external components.

Reset assertion logic requires all monitored inputs (ADJ1, ADJ2, VCC) to remain valid for the full timeout period before releasing RST - configurable via TMR pin (internal 200ms timer, external capacitor, or disabled). Glitch filtering on comparator propagation (50–800µs) and output low-voltage hold-down (guaranteed <0.15V at RST with VCC ≥ 0.5V) ensure robust operation during brownout and power-up sequencing.

Key Specifications

Pinout & Package

Package: 10-Lead (3mm × 2mm) Plastic DFN with exposed thermal pad (Pin 11), rated for –40°C to +125°C junction temperature and AEC-Q100 automotive qualification.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G33DBVR and MAX6326LT25D3+T, the LTC2919HDDB-2.5#TRMPBF provides unique triple-input flexibility, polarity configurability, and buffered 1V reference - making it irreplaceable in automotive systems requiring simultaneous supervision of core, I/O, and negative bias rails within a single AEC-Q100 qualified package.

Availability

LTC2919HDDB-2.5#TRMPBF is available at Aetrix Electronics and suitable for automotive engine control units, ADAS domain controllers, and industrial motor drive systems requiring stable component supply with AEC-Q100 qualification and extended temperature operation.

Supply support for LTC2919HDDB-2.5#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 automotive, industrial, communications, and healthcare markets.

The LTC2919 product line delivers precision, low-power, multi-rail voltage supervision ICs optimized for automotive and harsh-environment applications - emphasizing threshold accuracy, glitch immunity, and AEC-Q100 compliance.

FAQ

What is the guaranteed operating temperature range for the LTC2919HDDB-2.5#TRMPBF?

The LTC2919HDDB-2.5#TRMPBF is rated for –40°C to +125°C junction temperature and is AEC-Q100 qualified for automotive under-hood applications. This H-grade specification ensures reliable operation in engine control units, transmission control modules, and ADAS processors where ambient temperatures exceed 105°C.

How does the SEL pin configure input polarity on the LTC2919HDDB-2.5#TRMPBF?

The SEL pin on the LTC2919HDDB-2.5#TRMPBF selects ADJ1/ADJ2 polarity via three states: tied to VCC sets both inputs for positive-rail UV detection, tied to GND sets both for negative-rail UV detection, and left open configures ADJ1 for positive UV and ADJ2 for negative UV. This eliminates external logic and enables flexible fault coverage with one IC.

Can the LTC2919HDDB-2.5#TRMPBF monitor a negative supply without external components?

Yes - the LTC2919HDDB-2.5#TRMPBF can monitor negative supplies directly using its buffered 1V REF output. When SEL is set to GND or open, ADJ1 or ADJ2 becomes a negative-rail input; the REF pin provides the precise offset needed to bias the external resistor divider, removing the need for an external reference or op-amp.

What is the minimum VCC voltage required for the LTC2919HDDB-2.5#TRMPBF to assert a valid RST low?

The LTC2919HDDB-2.5#TRMPBF guarantees RST output low voltage ≤ 0.15V with VCC as low as 0.5V. This low-voltage hold-down capability ensures deterministic reset assertion during automotive cold-cranking events where battery voltage dips below 6V, preventing undefined logic states in downstream processors.

Does the LTC2919HDDB-2.5#TRMPBF require an external capacitor for its 200ms reset timeout?

No - the LTC2919HDDB-2.5#TRMPBF includes an accurate internal 200ms timer. Connecting the TMR pin to GND activates this internal timeout, eliminating the need for an external capacitor and associated layout area, leakage, and tolerance sensitivity - simplifying design and improving long-term reliability.