Analog Devices Inc. LTC2913IDD-2#TRPBF

Overview

LTC2913IDD-2#TRPBF from Analog Devices (formerly Linear Technology) is a dual-input undervoltage/overvoltage supervisor IC designed for simultaneous monitoring of two independent power rails. It features adjustable UV/OV trip thresholds (±1.5% accuracy), 44μA quiescent current, open-drain UV/OV outputs, and a dedicated DIS pin to disable both outputs. It is used in desktop/notebook computers and network servers for core/I/O voltage supervision.

For engineers reviewing the LTC2913IDD-2#TRPBF datasheet, LTC2913IDD-2#TRPBF pinout, LTC2913IDD-2#TRPBF application, or LTC2913IDD-2#TRPBF equivalent, key selection criteria include guaranteed 1V operation, glitch-filtered timing, adjustable reset timeout via external capacitor, and explicit output disable functionality unique to the -2 variant.

Technical Context

The LTC2913IDD-2#TRPBF implements two independent comparator pairs per monitored rail-one for undervoltage (VHn inputs) and one for overvoltage (VLn inputs)-with shared open-drain UV and OV outputs. Its internal shunt regulator enables operation from supplies up to 6V directly or higher voltages with external current limiting.

Unlike the LTC2913-1 variant, the -2 version replaces the LATCH pin with DIS (Pin 8), allowing full disable of both UV and OV outputs when pulled high-except during VCC undervoltage lockout (UVLO), where UV asserts low regardless. The TMR pin supports programmable timeout (6–14ms typical with 1nF) and can be strapped to VCC to bypass timing.

Key Specifications

Pinout & Package

Package: 10-lead (3mm × 3mm) plastic DFN with exposed pad (Pin 11, optional GND connection).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC2913CMS-2, the LTC2913IDD-2#TRPBF offers identical supervision functionality in a smaller, thermally superior DFN package-ideal for compact computing platforms. Versus LTC2904CMS8#PBF, it delivers critical features including output disable, programmable timeout, and guaranteed 1V operation, making it suitable for robust multi-rail systems requiring deterministic reset control.

Availability

LTC2913IDD-2#TRPBF is available at Aetrix Electronics and suitable for desktop computers, network servers, and industrial embedded controllers requiring stable component supply across extended temperature ranges (–40°C to 85°C).

Supply support for LTC2913IDD-2#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 acquired Linear Technology in 2017 and maintains its precision analog portfolio. Linear pioneered high-performance voltage supervisors with sub-μA quiescent current and ±1% threshold accuracy.

The LTC2913 family was designed specifically for space-constrained, multi-rail computing and communications equipment requiring simultaneous UV/OV monitoring with minimal board area and power consumption.

FAQ

What is the minimum VCC voltage required for LTC2913IDD-2#TRPBF to assert a valid UV output?

The LTC2913IDD-2#TRPBF guarantees UV output assertion down to VCC = 1V. Below this, operation is not specified. At VCC ≥1V, UV pulls low immediately upon power-up and remains asserted until all VH inputs recover and the TMR timeout expires. This ensures fail-safe reset generation even during severe brown-out conditions before the host microcontroller becomes operational.

How does the DIS pin on LTC2913IDD-2#TRPBF behave during VCC undervoltage lockout?

During VCC undervoltage lockout (UVLO), which occurs when VCC drops below 1.9–2.1V, the DIS pin is overridden: UV asserts low regardless of DIS state, while OV is blocked from asserting. This ensures mandatory reset activation during critical supply collapse-even if DIS is held high for normal operation. Once VCC rises above UVLO threshold, DIS regains control over both outputs.

Can LTC2913IDD-2#TRPBF monitor negative voltages?

No, the LTC2913IDD-2#TRPBF is designed exclusively for positive voltage monitoring. Its VHn and VLn inputs operate with reference to GND and require input voltages between –0.3V and 7.5V. For negative rail supervision, Analog Devices offers the LTC2909 or LTC2914, which support dedicated negative input configurations with separate bias references.

What is the maximum recommended capacitor value for the TMR pin on LTC2913IDD-2#TRPBF?

There is no strict upper limit, but capacitor leakage current must not exceed 1.3μA-the minimum TMR charging current. For long timeouts (e.g., >1s), use low-leakage film or NP0/C0G ceramics. Electrolytics and high-K ceramics (X7R, Y5V) are discouraged due to leakage and voltage coefficient effects. With a 100nF capacitor, timeout exceeds 100ms; verify actual delay using the formula CTMR = tUOTO × 115 × 10⁻⁹.

Does LTC2913IDD-2#TRPBF require external pull-up resistors on UV and OV pins?

External pull-ups are optional but recommended for critical timing. The LTC2913IDD-2#TRPBF includes weak internal pull-ups (~400kΩ) to VCC, sufficient for non-time-critical applications. However, for fast rise times or wired-OR configurations, add external pull-ups ≤100kΩ-especially on OV when VCC < 2V, where internal pull-up strength diminishes significantly.