Analog Devices Inc. LTC2912CTS8-3#TRPBF

Overview

LTC2912CTS8-3#TRPBF from Analog Devices is a single-channel UV/OV voltage monitor IC in 8-lead TSOT-23 package, designed to detect undervoltage and overvoltage events on a 3.3V ±10% supply rail. It features ±1.5% threshold accuracy, 29µA quiescent current, open-drain noninverting OV output with latch control, and adjustable reset timeout via external capacitor. Used for power-good monitoring in desktop computers and network servers.

For engineers reviewing the LTC2912CTS8-3#TRPBF datasheet, LTC2912CTS8-3#TRPBF pinout, LTC2912CTS8-3#TRPBF application, or LTC2912CTS8-3#TRPBF equivalent, key selection criteria include guaranteed operation down to VCC = 1V, glitch-immune VH/VL inputs, noninverting OV logic behavior, latch-clear functionality via LATCH pin, and compatibility with 12V/24V/48V supplies using internal shunt regulator.

Technical Context

The LTC2912CTS8-3#TRPBF implements dual comparator-based monitoring: VH input triggers UV when below 0.5V, VL input triggers OV when above 0.5V. Its internal 6.5V shunt regulator enables direct operation from 12V/24V/48V rails with external series resistor. The TMR pin sets timeout period (e.g., 8.5ms with 1nF) or bypasses timing when tied to VCC.

This variant (LTC2912-3) provides noninverting OV output-asserts high with weak internal pull-up to VCC during overvoltage-and includes latch control via LATCH pin: low enables latching, high clears latch and enables timeout-based behavior identical to UV output. Guaranteed OV/UV assertion at VCC ≥ 1V supports brownout-safe system initialization.

Key Specifications

Pinout & Package

Package: 8-lead TSOT-23 (3mm × 1.75mm), RoHS-compliant, lead-free finish. Exposed pad not present in TSOT-23 variant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC2912CTS8-3#TRPBF, the -1 variant offers identical timing and accuracy but mandates active-low reset handling, while the LTC2913 enables dual-rail monitoring at the cost of added complexity and no shunt regulation-making the LTC2912CTS8-3#TRPBF optimal for single-rail, high-voltage-supplied systems requiring noninverting OV signaling.

Availability

LTC2912CTS8-3#TRPBF is available at Aetrix Electronics and suitable for desktop computers, network servers, and industrial PLCs requiring stable component supply with guaranteed C-grade temperature performance and long-term production continuity.

Supply support for LTC2912CTS8-3#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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and computing markets since 1965.

The LTC2912 product line delivers precision, low-power voltage supervision for single-rail systems-designed specifically for reliable power-good assertion in commercial computing and telecom infrastructure where supply stability is critical.

FAQ

What is the function of the LATCH pin on the LTC2912CTS8-3#TRPBF?

The LATCH pin on the LTC2912CTS8-3#TRPBF controls the behavior of the noninverting OV output. When pulled low, OV latches high upon overvoltage detection and remains asserted until LATCH is raised high. When held high, OV behaves like the UV output-asserting high for a programmable timeout period after the VL input returns to valid range. This dual-mode operation is unique to the LTC2912-3 variant and enables flexible fault response without external logic.

Can the LTC2912CTS8-3#TRPBF monitor a 48V supply directly?

Yes, the LTC2912CTS8-3#TRPBF can monitor a 48V supply directly using its internal 6.5V shunt regulator on the VCC pin. A series current-limiting resistor must be placed between the 48V source and VCC to restrict input current to ≤10mA. For example, a 3.8kΩ resistor limits current to ~10mA at 48V, ensuring safe operation while maintaining 29µA quiescent current draw from the regulated internal rail. No external regulator is required.

What is the minimum VCC voltage required for valid output assertion on the LTC2912CTS8-3#TRPBF?

The LTC2912CTS8-3#TRPBF guarantees valid UV and OV output assertion down to VCC = 1V. At this voltage, UV will assert low and OV will assert high (noninverting) with VOL ≤ 0.15V and VOH ≥ 0.1V. This brownout-safe operation ensures reliable reset generation during power-up and deep undervoltage conditions, supporting robust system initialization sequences in commercial-grade applications.

How is the reset timeout period set on the LTC2912CTS8-3#TRPBF?

The reset timeout period on the LTC2912CTS8-3#TRPBF is set by an external capacitor (CTMR) connected between the TMR pin and GND. The relationship is linear: tUOTO ≈ 9ms per nanofarad (e.g., 1nF yields ~9ms, 22nF yields ~200ms). The TMR pin must have ≥10pF load; tying it directly to VCC bypasses the timeout entirely, causing immediate output assertion/clearing. Capacitor leakage must stay below 1.3µA to maintain timing accuracy.

Does the LTC2912CTS8-3#TRPBF support 3.3V ±10% supply monitoring out-of-the-box?

Yes, the LTC2912CTS8-3#TRPBF is explicitly characterized for 3.3V ±10% supply monitoring. With VH and VL inputs referenced to 0.5V thresholds, a standard 3-resistor divider (e.g., RA = 4.53kΩ, RB = 1kΩ, RC = 27.4kΩ) configures exact 2.97V UV and 3.63V OV trip points. Combined with ±1.5% threshold accuracy and input filtering, it meets tight tolerance requirements without calibration-validated in Analog Devices' Typical Application TA01a and TA05.