Analog Devices Inc. LTC2912IDDB-1#TRPBF

Overview

LTC2912IDDB-1#TRPBF from Analog Devices is a single-channel UV/OV voltage monitor IC with latch-controlled overvoltage output, ±1.5% threshold accuracy, 29µA quiescent current, and operation from 2.3V to 6V (or higher via internal 6.6V shunt regulator). It monitors core or I/O supply rails in desktop computers, network servers, and industrial power systems.

For engineers reviewing the LTC2912IDDB-1#TRPBF datasheet, LTC2912IDDB-1#TRPBF pinout, LTC2912IDDB-1#TRPBF application, or LTC2912IDDB-1#TRPBF equivalent, key selection criteria include guaranteed 1V VCC operation, adjustable reset timeout via external capacitor, open-drain UV/OV outputs, and DFN-8 (3mm × 2mm) package compatibility with space-constrained PCB layouts.

Technical Context

The LTC2912IDDB-1#TRPBF implements dual comparator-based monitoring: VH input triggers undervoltage when below 0.5V, VL input triggers overvoltage when above 0.5V. Both inputs feature integrated low-pass filtering for glitch immunity without added hysteresis error.

Its TMR pin sets UV/OV timeout duration (e.g., 8.5ms with 1nF), and LATCH pin enables OV output latching-low = latch active, high = bypassed. Internal VCC shunt regulation (6.6V typ.) allows direct connection to 12V/24V/48V supplies with series resistor.

Key Specifications

Pinout & Package

Package: 8-lead (3mm × 2mm) plastic DFN with exposed thermal pad (Pin 9 = GND, must be soldered).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC2912ITS8-1#TRPBF, the LTC2912IDDB-1#TRPBF offers 3.5× lower thermal resistance (55°C/W vs. 195°C/W) and 40% smaller footprint; versus LTC2913IDDB#TRPBF, it trades dual-channel capability for lower cost, lower ICC (29µA), and dedicated latch control on OV output.

Availability

LTC2912IDDB-1#TRPBF is available at Aetrix Electronics and suitable for desktop computing, network server, and industrial embedded applications requiring stable component supply, guaranteed –40°C to +85°C operation, and long-term lifecycle support.

Supply support for LTC2912IDDB-1#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 LTC2912 product line delivers precision, low-power voltage supervision ICs optimized for reliable power-rail monitoring in space-constrained, thermally demanding environments such as servers and embedded controllers.

FAQ

What is the minimum VCC voltage required for LTC2912IDDB-1#TRPBF to assert valid UV and OV outputs?

The LTC2912IDDB-1#TRPBF guarantees functional UV and OV outputs down to VCC = 1V. At this level, UV asserts low and OV exhibits weak pull-up behavior. Full comparator operation (VH/VL input control) begins above VCC = 2.1V, per the datasheet's VCC(UVLO) specification. This ensures fail-safe reset signaling even during severe brownout conditions before the main system supply stabilizes.

How does the LATCH pin affect OV output behavior in LTC2912IDDB-1#TRPBF?

In LTC2912IDDB-1#TRPBF, the LATCH pin controls OV output latching: when pulled low, OV latches low upon overvoltage detection and remains asserted until LATCH is raised high; when held high, OV behaves identically to UV-asserting low for the programmed timeout period after fault clearance. This dual-mode operation enables either persistent fault flagging or automatic recovery based on system-level reset architecture requirements.

Can LTC2912IDDB-1#TRPBF monitor a 48V supply directly, and what external components are required?

Yes, LTC2912IDDB-1#TRPBF can monitor a 48V supply directly using its internal 6.6V shunt regulator. A series current-limiting resistor (RZ) must be placed between the 48V source and the VCC pin to restrict shunt current to ≤10mA. For 48V, RZ ≈ (48V – 6.6V)/10mA = 4.14kΩ (use 4.3kΩ standard value). A 0.1µF bypass capacitor is still required at VCC to GND for stability.

What is the recommended capacitor value on the TMR pin for a 200ms UV/OV timeout in LTC2912IDDB-1#TRPBF?

For a 200ms timeout, LTC2912IDDB-1#TRPBF requires a 22nF capacitor between TMR and GND, as confirmed by the "Reset Time-Out Period vs Capacitance" graph (Figure 2912 G08) and typical application circuit TA01a. The scaling factor is ~9ms/nF; thus, 200ms ÷ 9ms/nF ≈ 22.2nF. A standard 22nF ±10% ceramic capacitor meets this requirement with margin.

Does LTC2912IDDB-1#TRPBF support monitoring negative supply rails?

No, LTC2912IDDB-1#TRPBF is designed exclusively for positive rail monitoring. Its VH and VL inputs operate referenced to GND, with valid input ranges of –0.3V to 7.5V. Negative voltage monitoring requires dedicated devices such as the LTC2909, which includes separate negative-input circuitry and biasing. Attempting to apply negative voltages to VH/VL may exceed absolute maximum ratings and cause permanent damage.