Analog Devices Inc. LTC2919IMS-2.5#TRPBF

Overview

LTC2919IMS-2.5#TRPBF from Analog Devices is a precision triple-input voltage supervisor IC for system power monitoring, featuring two adjustable 0.5V-threshold inputs (±1.5% accuracy over –40°C to +85°C), a fixed 2.5V supply UVLO monitor, open-drain RST/OUT1/OUT2 outputs, and pin-selectable polarity for positive/negative supply UV/OV detection in space-constrained industrial and automotive electronics.

For engineers reviewing the LTC2919IMS-2.5#TRPBF datasheet, LTC2919IMS-2.5#TRPBF pinout, LTC2919IMS-2.5#TRPBF application, or LTC2919IMS-2.5#TRPBF equivalent, key selection considerations include its 50µA quiescent current, 200ms internal reset timeout, buffered 1V reference for negative rail offset, 6.5V shunt regulator capability, and MSOP-10 package compatibility with high-density PCB layouts.

Technical Context

The LTC2919IMS-2.5#TRPBF implements dual independent comparators with user-configurable input polarity via the three-state SEL pin, enabling simultaneous UV/OV monitoring of mixed-polarity supplies (e.g., +5V and –15V) without external components. Its VCC UVLO threshold is fixed at 2.175V (–10% of 2.5V) with ±0.3% hysteresis, guaranteed across temperature.

Reset assertion logic requires all monitored inputs (ADJ1, ADJ2, VCC) to remain valid for the full timeout period-internally 200ms when TMR = GND-before releasing RST. Glitch rejection is achieved through comparator propagation delay filtering (50–800µs depending on overdrive) and no inherent hysteresis outside comparator mode (TMR = VCC).

Key Specifications

Pinout & Package

Package: 10-Lead Plastic MSOP (3mm × 3mm), exposed pad optional, rated for –40°C to +85°C (I-grade). Pin 11 (exposed pad) is not present in MSOP; DFN variant has it.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G33DBVR and MAX6326LT29D3+T, the LTC2919IMS-2.5#TRPBF uniquely delivers triple monitoring (two adjustable + one fixed), polarity configurability, and buffered reference in a single MSOP-10 package - making it irreplaceable for multi-rail, mixed-polarity, or negative-supply applications requiring ±1.5% accuracy.

Availability

LTC2919IMS-2.5#TRPBF is available at Aetrix Electronics and suitable for industrial PLCs, automotive infotainment systems, and telecom equipment requiring stable component supply with AEC-Q100-compliant temperature range (–40°C to +85°C) and long-term traceability.

Supply support for LTC2919IMS-2.5#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 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 specifically for mission-critical power sequencing, brownout protection, and fault detection in space-constrained embedded systems.

FAQ

What is the exact VCC UVLO threshold for LTC2919IMS-2.5#TRPBF?

The LTC2919IMS-2.5#TRPBF has a guaranteed VCC undervoltage lockout threshold of 2.175V (–10% of 2.5V nominal), with ±0.3% hysteresis and operation specified over –40°C to +85°C. This value is factory-trimmed and applies exclusively to parts marked "-2.5" - not to -3.3 or -5 variants. The LTC2919IMS-2.5#TRPBF uses this threshold to monitor its own supply rail for brownout conditions before enabling output release.

Can LTC2919IMS-2.5#TRPBF monitor negative voltages, and how is polarity selected?

Yes, the LTC2919IMS-2.5#TRPBF can monitor negative supplies using its buffered 1V REF output as an offset reference and configuring ADJ1 or ADJ2 for negative polarity via the SEL pin. When SEL = GND, both ADJ inputs operate in negative polarity mode, meaning they assert low when the applied voltage falls below 0.5V (e.g., –4.3V on a –5V rail). The LTC2919IMS-2.5#TRPBF requires no external op-amps or level shifters to achieve this functionality.

What is the minimum VCC voltage required for LTC2919IMS-2.5#TRPBF to guarantee valid RST output?

The LTC2919IMS-2.5#TRPBF guarantees RST output low voltage (VOL) ≤ 0.15V with VCC as low as 0.5V, per Electrical Characteristics table. This ensures deterministic reset assertion during deep brownout or power-up sequences where VCC rises slowly. The LTC2919IMS-2.5#TRPBF maintains this specification across its full –40°C to +85°C operating range, critical for automotive and industrial reliability.

How does the TMR pin configure reset timeout on LTC2919IMS-2.5#TRPBF?

The TMR pin on the LTC2919IMS-2.5#TRPBF selects reset timeout mode: tied to GND enables the internal 200ms timer; left open yields ~400µs minimum; tied to VCC disables timeout (comparator mode); and connected to a capacitor to GND sets timeout = 9ms/nF (e.g., 22nF → 200ms). The LTC2919IMS-2.5#TRPBF datasheet specifies TMR voltage thresholds (e.g., VTMR(INT) = 0.10–0.40V) to ensure robust mode selection under noise.

Is LTC2919IMS-2.5#TRPBF compatible with 12V or 24V input supplies?

Yes - the LTC2919IMS-2.5#TRPBF integrates a 6.5V shunt regulator on VCC, allowing direct connection to 12V/24V supplies when used with a series current-limiting resistor. For example, a 10kΩ resistor limits VCC current to <10mA with a 24V source. The LTC2919IMS-2.5#TRPBF then regulates its internal circuitry while still monitoring the 2.5V rail via UVLO - no external LDO required.