Analog Devices Inc. LTC2919CMS-3.3#TRPBF

Overview

LTC2919CMS-3.3#TRPBF from Analog Devices is a precision triple-input UV/OV monitor IC for system power supervision, featuring two 0.5V-threshold adjustable inputs with ±1.5% accuracy over –40°C to 85°C, a fixed 3.3V supply UVLO input (2.871V threshold), open-drain RST/OUT1/OUT2 outputs, and configurable reset timeout (200ms internal or external capacitor). It supports positive/negative supply monitoring in desktop, server, and automotive electronics.

For engineers reviewing the LTC2919CMS-3.3#TRPBF datasheet, LTC2919CMS-3.3#TRPBF pinout, LTC2919CMS-3.3#TRPBF application, or LTC2919CMS-3.3#TRPBF equivalent, key selection factors include its 3.3V-specific VCC UVLO threshold, SEL-pin polarity configuration, 50µA quiescent current, and 10-lead MSOP package compatibility with space-constrained PCB layouts.

Technical Context

The LTC2919CMS-3.3#TRPBF implements dual comparator-based monitoring with independent ADJ1/ADJ2 inputs (nominal 0.5V threshold, ±1.5% accuracy), each configurable via three-state SEL pin for positive/negative polarity detection. Its third monitoring channel uses the VCC pin's built-in –10% UVLO (2.871V min) for 3.3V supply supervision.

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

Key Specifications

Pinout & Package

Package: 10-Lead Plastic MSOP (LTDMT marking), 3mm × 3mm body, exposed pad not present (DFN variant only). Pin 1 = SEL, Pin 2 = VCC, Pin 3 = OUT1, Pin 4 = OUT2, Pin 5 = RST, Pin 6 = GND, Pin 7 = REF, Pin 8 = TMR, Pin 9 = ADJ2, Pin 10 = ADJ1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G33DBVR and MAX6369KA29+T, the LTC2919CMS-3.3#TRPBF provides unique dual adjustable inputs with polarity selection and a buffered 1V reference-enabling compact, flexible supervision of mixed positive/negative rails without external components.

Availability

LTC2919CMS-3.3#TRPBF is available at Aetrix Electronics and suitable for server power management, automotive infotainment systems, and industrial PLC modules requiring stable component supply and AEC-Q100-aligned reliability.

Supply support for LTC2919CMS-3.3#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.

The LTC2919 product line delivers precision, low-power, multi-rail voltage supervision ICs designed for mission-critical power integrity in computing, networking, and automotive electronics.

FAQ

What is the exact VCC UVLO threshold for LTC2919CMS-3.3#TRPBF?

The LTC2919CMS-3.3#TRPBF has a guaranteed VCC UVLO threshold of 2.871V minimum (–10% of 3.3V) over the full –40°C to +85°C temperature range, with ±0.05V hysteresis. This value is factory-trimmed and specified in the Electrical Characteristics table under VCC(UVLO) for the -3.3 variant. The LTC2919CMS-3.3#TRPBF uses this internal threshold to supervise its own 3.3V supply without external resistors.

How does the SEL pin configure polarity for ADJ1 and ADJ2 on LTC2919CMS-3.3#TRPBF?

The SEL pin on LTC2919CMS-3.3#TRPBF selects one of three polarity combinations: tied to VCC sets both ADJ1 and ADJ2 to positive polarity (UV detection); tied to GND sets both to negative polarity (UV detection on negative rails); left open sets ADJ1 to positive and ADJ2 to negative polarity. Each configuration enables distinct fault detection modes (e.g., +5V UV and –12V UV) without external components. The LTC2919CMS-3.3#TRPBF datasheet Table 1 defines all valid states.

Can LTC2919CMS-3.3#TRPBF monitor a negative supply like –5V?

Yes, the LTC2919CMS-3.3#TRPBF can monitor negative supplies such as –5V by configuring ADJ1 or ADJ2 for negative polarity via the SEL pin and using the buffered 1V REF output as an offset. For example, connecting –5V to ADJ1 through a resistor divider referenced to REF creates a 0.5V comparator input when –5V is at nominal value. The LTC2919CMS-3.3#TRPBF then asserts OUT1 low if the –5V rail rises toward ground (undervoltage condition).

What is the reset timeout behavior when using the internal 200ms setting on LTC2919CMS-3.3#TRPBF?

When TMR is tied to GND, the LTC2919CMS-3.3#TRPBF activates its internal 200ms reset timeout. RST remains low until *all* monitored inputs (ADJ1, ADJ2, and VCC) are simultaneously valid for the full 200ms period. If any input fails during this window, the timer resets and restarts upon recovery. This ensures robust power-up sequencing and prevents glitches from propagating to downstream logic. The LTC2919CMS-3.3#TRPBF guarantees this timing across temperature and supply variations.

Does LTC2919CMS-3.3#TRPBF require external capacitors for stable operation?

The LTC2919CMS-3.3#TRPBF requires only a 0.1µF ceramic bypass capacitor between VCC and GND for stable operation; no capacitor is needed on REF (buffered output) or TMR (capacitor optional for external timeout). The datasheet explicitly states that adding capacitance to REF degrades transient performance and is not recommended. All other pins are internally compensated. The LTC2919CMS-3.3#TRPBF's low 50µA quiescent current minimizes bypass capacitor discharge effects during brownout.