Analog Devices Inc. LTC2919CMS-2.5#PBF

Overview

LTC2919CMS-2.5#PBF from Analog Devices is a precision triple/dual-input voltage monitor IC designed for system-level supply supervision in space-constrained, low-power applications. It features two adjustable 0.5V-threshold inputs with ±1.5% accuracy over temperature, a dedicated 2.5V VCC UVLO input, open-drain RST/OUT1/OUT2 outputs, and pin-selectable polarity for monitoring positive or negative supplies - used in desktop computers, network servers, and automotive core/I/O power rails.

For engineers reviewing the LTC2919CMS-2.5#PBF datasheet, LTC2919CMS-2.5#PBF pinout, LTC2919CMS-2.5#PBF application, or LTC2919CMS-2.5#PBF equivalent, key selection considerations include its 10-lead MSOP package, 50µA quiescent current, 200ms internal reset timeout, buffered 1V reference, and support for dual UV/OV monitoring of mixed-polarity supplies without external components.

Technical Context

The LTC2919CMS-2.5#PBF implements dual independent comparators with user-configurable polarity via the three-state SEL pin (VCC/GND/open), enabling simultaneous monitoring of positive UV, negative OV, or mixed conditions. Its third monitoring channel uses an accurate –10% VCC UVLO threshold (2.175V min for 2.5V nominal) with no hysteresis outside comparator mode.

Reset behavior is governed by a configurable timeout: internal 200ms timer (TMR = GND), external capacitor (9ms/nF), or disabled (TMR = VCC). Glitch rejection is achieved through propagation delay filtering (50–800µs vs. overdrive) and no built-in hysteresis - preserving ±1.5% threshold accuracy across –40°C to 85°C operating range.

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 voltage monitor applications.

Compared with MAX6316MUT46D3+T and TPS3808G33DBVR, the LTC2919CMS-2.5#PBF delivers integrated dual adjustable monitoring, polarity flexibility, and buffered reference in one MSOP package - reducing design complexity for multi-rail systems requiring <±1.5% accuracy and sub-100µA quiescent current.

Availability

LTC2919CMS-2.5#PBF is available at Aetrix Electronics and suitable for desktop computers, network servers, and automotive infotainment systems requiring stable component supply, long-term lifecycle support, and AEC-Q100-aligned reliability data.

Supply support for LTC2919CMS-2.5#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-2.5#PBF belongs to Analog Devices' precision voltage supervisor product line, engineered for high-accuracy, low-power, multi-rail system monitoring in space-constrained commercial and automotive applications.

FAQ

What is the function of the SEL pin on the LTC2919CMS-2.5#PBF?

The SEL pin on the LTC2919CMS-2.5#PBF is a three-state input that configures the polarity of the ADJ1 and ADJ2 comparator inputs. When tied to VCC, both inputs monitor positive supplies for UV; when grounded, both monitor negative supplies for UV; when left open, ADJ1 monitors positive UV and ADJ2 monitors negative OV. This eliminates external polarity-reversal circuitry and enables flexible fault detection schemes without changing the LTC2919CMS-2.5#PBF's external connections.

Can the LTC2919CMS-2.5#PBF monitor a negative supply without external op-amps?

Yes - the LTC2919CMS-2.5#PBF can directly monitor negative supplies using its buffered 1V REF output and SEL pin configuration. For example, with SEL = GND, ADJ2 accepts a resistor divider referenced to REF and the negative rail, allowing accurate –5V UV detection at the 0.5V comparator threshold. No op-amps or level shifters are required because the LTC2919CMS-2.5#PBF's input structure and REF buffer are designed specifically for this use case.

What is the minimum VCC voltage required for the LTC2919CMS-2.5#PBF to assert a valid RST low?

The LTC2919CMS-2.5#PBF 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 conditions. The device begins functional operation (comparator enable, SEL decoding, timeout initialization) only after VCC exceeds the 2.175V UVLO threshold, but the output stage remains active down to 0.5V - a critical feature confirmed in the LTC2919CMS-2.5#PBF's Absolute Maximum Ratings and VOH/VOL specifications.

How does the LTC2919CMS-2.5#PBF achieve ±1.5% threshold accuracy without hysteresis?

The LTC2919CMS-2.5#PBF achieves ±1.5% threshold accuracy across –40°C to 85°C by using laser-trimmed internal references and matched comparator input stages - not hysteresis. Hysteresis is intentionally omitted outside comparator mode (TMR = VCC) to preserve absolute accuracy; instead, glitch immunity is provided by propagation delay filtering (50–800µs vs. overdrive) and programmable reset timeout. This design ensures the LTC2919CMS-2.5#PBF meets tight trip-point specs without degrading effective accuracy through hysteresis bands.

Is the REF pin on the LTC2919CMS-2.5#PBF required to be bypassed with a capacitor?

No - the REF pin on the LTC2919CMS-2.5#PBF must not be bypassed with a capacitor. The datasheet explicitly states "This pin does not require a bypass capacitor, nor is one recommended." The buffered 1V reference is designed to drive resistive dividers and small capacitive loads (≤1000pF) directly; adding external capacitance degrades transient response and may cause instability. Leaving REF unconnected is acceptable if unused, and no decoupling is needed for proper LTC2919CMS-2.5#PBF operation.