Analog Devices Inc. LTC2900-2CMS#PBF

Overview

LTC2900-2CMS#PBF from Analog Devices (acquired Linear Technology) is a programmable quad supply monitor IC with push-pull RST output, simultaneously supervising four independent voltage rails (e.g., 5V, 3.3V, 2.5V, 1.8V), ±1.5% threshold accuracy over temperature, 43µA typical supply current, and adjustable reset timeout via external capacitor. It is used in multivoltage computing and telecom systems requiring reliable power-on reset and brownout detection.

For engineers reviewing the LTC2900-2CMS#PBF datasheet, LTC2900-2CMS#PBF pinout, LTC2900-2CMS#PBF application, or LTC2900-2CMS#PBF equivalent, key selection criteria include push-pull RST drive capability, VCC operation down to 1V, 16-programmable voltage threshold combinations, manual reset support, and MSOP-10 package compatibility with space-constrained PCB layouts.

Technical Context

The LTC2900-2CMS#PBF implements four independent high-accuracy comparators with internal 1.210V buffered reference, enabling precise undervoltage detection across selectable thresholds (5V/3.3V/3V/2.5V/1.8V/1.5V/ADJ/–ADJ). Threshold selection is performed via a single-pin resistor divider on VPG during a 150µs power-up programming window.

Reset assertion is synchronized across all monitored supplies; RST remains low until all inputs exceed their thresholds, then holds for a user-defined delay set by CRT capacitor (e.g., 47nF → 216ms). The push-pull RST output actively drives high to V2 (not open-drain), ensuring fast rise time (~206ns) and guaranteed logic state at VCC ≥ 1V without external pull-up.

Key Specifications

Pinout & Package

Package: 10-lead MSOP (3mm × 3mm), RoHS-compliant, moisture sensitivity level 1, rated for 0°C to 70°C operating temperature.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC2901CMS#PBF and LTC2902IMS#PBF, the LTC2900-2CMS#PBF delivers identical quad-supply supervision and push-pull RST in a compact MSOP-10, but omits watchdog and margining features-making it optimal for cost-sensitive, space-constrained designs where only reset timing and rail validation are required.

Availability

LTC2900-2CMS#PBF is available at Aetrix Electronics and suitable for desktop computers, telecom base stations, and network servers requiring stable component supply with guaranteed long-term availability and traceable sourcing.

Supply support for LTC2900-2CMS#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 semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies.

The LTC2900 family was originally developed by Linear Technology (acquired by ADI in 2017) to address precision multirail supervision in computing and communications infrastructure, emphasizing low power, high accuracy, and flexible configuration.

FAQ

What is the key functional difference between LTC2900-2CMS#PBF and LTC2900-1CMS#PBF?

The LTC2900-2CMS#PBF features a push-pull RST output that actively drives high to V2, eliminating the need for an external pull-up resistor. In contrast, the LTC2900-1CMS#PBF uses an open-drain RST with weak internal pull-up (~6µA), requiring external pull-up for faster rise times or higher VOH. This makes LTC2900-2CMS#PBF preferable in noise-sensitive or high-speed reset applications where deterministic VOH and fast edge rates are critical.

How do I configure LTC2900-2CMS#PBF to monitor 5V, 3.3V, 2.5V, and 1.8V simultaneously?

To configure LTC2900-2CMS#PBF for 5V/3.3V/2.5V/1.8V monitoring, connect a resistor divider (R1 = 59.0kΩ, R2 = 40.2kΩ, 1%) between VREF and GND, and tie the junction to VPG. This selects Mode 6 from Table 1. Ensure V1 = 5V, V2 = 3.3V, V3 = 2.5V, and V4 = 1.8V are applied to respective pins, each bypassed with ≥0.1µF ceramic capacitors. The LTC2900-2CMS#PBF will then assert RST low until all four voltages exceed their ±1.5%-accurate thresholds.

Can LTC2900-2CMS#PBF monitor a negative supply such as –5V?

Yes, LTC2900-2CMS#PBF supports negative supply monitoring in –ADJ mode on V4. Connect a resistive divider between the –5V rail and VREF (not GND), with R3 = 464kΩ and R4 = 121kΩ (1%), per Table 3. The V4 pin senses the inverted trip point, and the internal comparator triggers RST when the negative rail falls below –4.64V. VREF provides the necessary level shift, and the circuit remains fully functional with VCC derived from positive rails (V1/V2).

What is the minimum VCC required for LTC2900-2CMS#PBF to guarantee correct RST logic state?

The LTC2900-2CMS#PBF guarantees correct RST logic state (low during fault, high during valid operation) for VCC ≥ 1V. This is specified in the Absolute Maximum Ratings table and confirmed in the Electrical Characteristics section under "VCC Minimum Internal Operating Voltage." Unlike many supervisors that require ≥2.7V or higher, this 1V specification enables reliable reset assertion during deep brownout events, protecting data integrity in volatile memory subsystems.

Does LTC2900-2CMS#PBF require external components beyond the CRT capacitor and VPG divider?

Yes - beyond CRT and VPG divider, LTC2900-2CMS#PBF requires 0.1µF bypass capacitors on V1 and V2 (mandatory, as they define VCC), plus optional 0.1µF capacitors on V3/V4 for noise filtering. A momentary switch between PBR and GND enables manual reset. No additional active components (e.g., transistors, op-amps) are needed; the integrated 1.210V VREF and push-pull RST eliminate external references or drivers required by discrete solutions.