Analog Devices Inc. LTC2901-2CGN#PBF

Overview

LTC2901-2CGN#PBF from Analog Devices (formerly Linear Technology) is a programmable quad supply monitor IC with push-pull reset output, adjustable reset and watchdog timers, ±1.5% voltage threshold accuracy over temperature, and 43μA typical supply current. It simultaneously monitors four independent supply rails (e.g., 5V, 3.3V, 2.5V, 1.8V) in multivoltage systems and asserts a guaranteed RST signal for VCC ≥ 1V.

For engineers reviewing the LTC2901-2CGN#PBF datasheet, LTC2901-2CGN#PBF pinout, LTC2901-2CGN#PBF application, or LTC2901-2CGN#PBF equivalent, key selection criteria include its push-pull RST output architecture, 16-pin narrow SSOP package, 5% or 10% selectable undervoltage tolerance (via TOL pin), individual nondelayed comparator outputs per supply, and power supply glitch immunity for reliable brownout detection.

Technical Context

The LTC2901-2CGN#PBF implements four independent high-accuracy voltage comparators referenced to a buffered 1.210V internal bandgap, with thresholds set via external resistor divider on VPG. Its reset and watchdog timing are capacitor-programmable (CRT and CWT pins), enabling precise delay tuning from ~50μs to seconds.

Unlike open-drain variants (LTC2901-1/LTC2901-3), the LTC2901-2CGN#PBF features an actively driven push-pull RST output pulled to V2, eliminating external pull-up requirements and ensuring fast, rail-to-rail logic transitions. The TOL pin enables dynamic selection between 5% and 10% undervoltage thresholds without hardware change.

Key Specifications

Pinout & Package

Package: 16-lead plastic narrow SSOP (GN16), 0.65mm pitch, RoHS-compliant lead-free finish (#PBF).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3307-18DGNR and MAX6816EUB+, the LTC2901-2CGN#PBF provides unique flexibility in voltage combination selection (16 options), capacitor-adjustable timing, ±ADJ/–ADJ support, and guaranteed 1V operation-making it optimal for complex, evolving multivoltage designs requiring field-programmability and robust fault coverage.

Availability

LTC2901-2CGN#PBF is available at Aetrix Electronics and suitable for desktop computers, telecom equipment, and network servers requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for LTC2901-2CGN#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and aerospace markets.

The LTC2901 product line was originally developed by Linear Technology (acquired by ADI in 2017) to address precision power supply monitoring in multirail systems where reliability, accuracy, and programmability are critical-especially in computing and infrastructure applications.

FAQ

What is the function of the TOL pin on the LTC2901-2CGN#PBF?

The TOL pin on the LTC2901-2CGN#PBF selects undervoltage tolerance: logic low configures 5% thresholds, logic high selects 10% thresholds. This allows dynamic adjustment of trip points without changing external resistors. The LTC2901-2CGN#PBF supports both modes, unlike earlier variants that fixed tolerance per part number.

Does the LTC2901-2CGN#PBF support negative voltage monitoring?

Yes, the LTC2901-2CGN#PBF supports negative voltage monitoring in –ADJ mode on V4. In this configuration, VREF provides level-shifting, enabling accurate trip point detection for negative rails (e.g., –5V, –12V) using an external resistor divider between the negative supply and VREF.

How is the reset timeout period set for the LTC2901-2CGN#PBF?

The reset timeout period for the LTC2901-2CGN#PBF is set by connecting an external capacitor (CRT) between Pin 5 (CRT) and GND. The relationship is tRST = 4.6 ms/nF; for example, a 47 nF capacitor yields ~216 ms delay. Leaving CRT unconnected gives a minimum delay of ~50 μs.

What is the difference between LTC2901-2CGN#PBF and LTC2901-1CGN#PBF?

The LTC2901-2CGN#PBF features a push-pull RST output actively driven to V2, while the LTC2901-1CGN#PBF uses an open-drain RST requiring an external pull-up. Both share identical monitoring, programming, and timing functionality-but the LTC2901-2CGN#PBF simplifies layout and improves rise time.

Can the LTC2901-2CGN#PBF monitor fewer than four supplies?

Yes, the LTC2901-2CGN#PBF can monitor fewer than four supplies. Unused inputs (e.g., V3, V4) may be tied to valid voltage levels or left floating only if configured in ADJ/–ADJ mode with appropriate external dividers; however, best practice is to connect all inputs to defined voltages or ground with proper biasing to avoid undefined comparator states.