Analog Devices Inc. LTC2919CMS-5#PBF

Overview

LTC2919CMS-5#PBF from Analog Devices is a precision triple/dual-input supply monitor IC designed for UV/OV supervision of 5V, 3.3V, and 2.5V systems. It features two adjustable 0.5V-threshold inputs with ±1.5% accuracy over temperature, a third fixed VCC UVLO (4.35V nominal), open-drain RST/OUT1/OUT2 outputs, and configurable polarity via three-state SEL pin - used in core voltage monitoring for desktop/server power sequencing.

For engineers reviewing the LTC2919CMS-5#PBF datasheet, LTC2919CMS-5#PBF pinout, LTC2919CMS-5#PBF application, or LTC2919CMS-5#PBF equivalent, key selection criteria include its ±1.5% threshold accuracy, 200ms internal reset timeout, 50µA quiescent current, 6.5V shunt-regulated VCC operation, and support for negative-supply offset monitoring via 1V buffered REF output.

Technical Context

The LTC2919CMS-5#PBF implements dual independent comparators with user-selectable input polarity (positive/negative UV/OV) controlled by the three-state SEL pin, enabling flexible fault detection across mixed-polarity supplies. Its VCC UVLO is factory-trimmed to 4.35V (–10% of 5V) with ±0.075V accuracy over 0°C to 70°C.

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 down to VCC = 0.5V, and support pull-up voltages exceeding VCC.

Key Specifications

Pinout & Package

Package: 10-Lead Plastic MSOP (3mm × 3mm), exposed pad optional, RoHS-compliant lead-free finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G33DBVR and MAX6816EUT+T, the LTC2919CMS-5#PBF delivers integrated triple monitoring, polarity configurability, and 1V buffered reference in a single MSOP package - reducing component count and layout complexity for multi-rail systems requiring ±1.5% threshold accuracy.

Availability

LTC2919CMS-5#PBF is available at Aetrix Electronics and suitable for desktop computing, network server power management, and industrial PLC I/O modules requiring stable component supply, long-term lifecycle support, and commercial-temperature-grade reliability.

Supply support for LTC2919CMS-5#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 LTC2919CMS-5#PBF belongs to Analog Devices' precision power monitoring product line, engineered for high-accuracy, low-power, multi-rail supervision in space-constrained computing and infrastructure systems.

FAQ

What is the VCC UVLO threshold for LTC2919CMS-5#PBF?

The LTC2919CMS-5#PBF has a factory-trimmed VCC UVLO threshold of 4.35V (–10% of 5V), specified with ±0.075V accuracy over its 0°C to 70°C operating range. This value is fixed for the -5 variant and does not require external configuration. The LTC2919CMS-5#PBF uses this threshold to assert RST during 5V rail brownout, ensuring reliable system reset before logic corruption occurs.

How does the SEL pin configure polarity on LTC2919CMS-5#PBF?

The SEL pin on the LTC2919CMS-5#PBF selects ADJ1/ADJ2 input polarity via three states: tied to VCC (both positive UV), left open (ADJ1 positive UV, ADJ2 negative OV), or tied to GND (both negative UV). Each configuration determines whether the comparator trips on voltage falling below (UV) or rising above (OV) the 0.5V threshold. The LTC2919CMS-5#PBF requires no external components to implement any of these modes.

Can LTC2919CMS-5#PBF monitor negative supplies?

Yes, the LTC2919CMS-5#PBF monitors negative supplies using its buffered 1V REF output as an offset reference. When SEL is configured for negative polarity, ADJ1 or ADJ2 detects when a negative rail's magnitude falls below the threshold (e.g., –4.3V for a –5V supply), signaling undervoltage. The LTC2919CMS-5#PBF supports this natively without external op-amps or level shifters.

What reset timeout options does LTC2919CMS-5#PBF support?

The LTC2919CMS-5#PBF offers three reset timeout modes: internal 200ms timer (TMR = GND), external capacitor timing (9ms/nF, e.g., 22nF → 200ms), or disabled comparator mode (TMR = VCC). The timeout begins only after both ADJ inputs and VCC are valid. This flexibility allows the LTC2919CMS-5#PBF to replace discrete RC networks while maintaining precise timing control.

Is LTC2919CMS-5#PBF compatible with higher-voltage supplies?

Yes - the LTC2919CMS-5#PBF integrates a 6.5V shunt regulator on VCC, enabling direct connection to supplies up to 6V. For voltages above 6V (e.g., 12V, 24V), a series current-limiting resistor must be added to keep VCC input current ≤10mA. The LTC2919CMS-5#PBF datasheet provides resistor calculation guidance based on supply min/max and REF load current.