Analog Devices Inc. LTC2900-2CMS#TRPBF

Overview

LTC2900-2CMS#TRPBF from Analog Devices (acquired Linear Technology) is a programmable quad supply monitor IC with push-pull RST output, simultaneously monitoring four 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 serves as a system-level power supervisor in multivoltage embedded systems requiring reliable brownout detection and manual reset capability.

For engineers reviewing the LTC2900-2CMS#TRPBF datasheet, LTC2900-2CMS#TRPBF pinout, LTC2900-2CMS#TRPBF application, or LTC2900-2CMS#TRPBF equivalent, key selection criteria include push-pull RST drive strength (200µA source), VCC operation down to 1V, guaranteed glitch immunity, and 16-programmable voltage threshold combinations using a single resistor divider on VPG.

Technical Context

The LTC2900-2CMS#TRPBF implements four independent high-accuracy comparators with internal reference (1.210V ±0.75%) and user-selectable trip points via VPG-resistor programming. Its architecture guarantees correct RST state for VCC ≥ 1V and supports both positive-adjustable (ADJ) and negative-adjustable (–ADJ) monitoring modes on V3/V4 inputs.

Reset timing is controlled by an external capacitor on CRT pin (4.6ms/nF scaling), while manual reset is debounced through the same timing circuit. The push-pull RST output actively drives high to V2 (not open-drain), enabling direct interface with CMOS logic without external pull-up resistors.

Key Specifications

Pinout & Package

Package: 10-lead MSOP (3mm × 3mm footprint, 0.5mm pitch), RoHS-compliant, surface-mount. Thermal resistance θJA = 250°C/W. Exposed pad recommended for thermal and electrical grounding.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC2901CMS#TRPBF and LTC2902IMS#TRPBF, the LTC2900-2CMS#TRPBF delivers identical core quad-supply monitoring and push-pull reset performance in the smallest package with lowest quiescent current, making it optimal for cost- and space-constrained commercial applications where watchdog or extended temp range is unnecessary.

Availability

LTC2900-2CMS#TRPBF 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 LTC2900-2CMS#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.

The LTC2900 family was designed specifically for multivoltage system supervision - delivering programmable, accurate, low-power monitoring of up to four rails in compact packages for computing, networking, and portable electronics.

FAQ

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

The LTC2900-2CMS#TRPBF features a push-pull RST output that actively sources 200µA to V2, enabling direct CMOS interfacing without external pull-up resistors. In contrast, the LTC2900-1CMS#TRPBF uses an open-drain RST with weak internal pull-up (~6µA to V2), requiring an external pull-up for defined high-state voltage and faster rise times. This makes the LTC2900-2CMS#TRPBF preferable for noise-sensitive or space-constrained designs.

Can LTC2900-2CMS#TRPBF monitor negative voltage rails like –5V?

Yes, the LTC2900-2CMS#TRPBF supports negative rail monitoring via its –ADJ mode on V4 input. By connecting an external resistor divider between the negative supply and VREF (1.210V), the device senses trip points such as –4.64V (using R3 = 464kΩ, R4 = 121kΩ). The internal comparator offset and VREF referencing enable accurate, glitch-immune detection without additional op-amps or level shifters.

What is the minimum VCC required for LTC2900-2CMS#TRPBF to assert a valid RST signal?

The LTC2900-2CMS#TRPBF guarantees correct RST logic state (active-low assertion) for VCC ≥ 1V. This specification ensures reliable reset generation even during deep brownout conditions where V1 or V2 drops near 1V - a critical feature for fail-safe microprocessor startup and shutdown sequencing in industrial and telecom systems.

How is the reset timeout period programmed on LTC2900-2CMS#TRPBF?

The reset timeout on LTC2900-2CMS#TRPBF is set by an external capacitor (CRT) connected between Pin 3 (CRT) and GND. The relationship is linear: tRST ≈ 4.6ms per nanofarad (e.g., 47nF yields ~216ms). Leaving CRT unconnected results in ~50µs minimum delay. Ceramic capacitors with low leakage (<100pA) are recommended to maintain timing accuracy across temperature and voltage.

Does LTC2900-2CMS#TRPBF require external components for basic operation?

Yes - minimal external components are required: 0.1µF bypass capacitors on V1 and V2 pins, a resistor divider (R1/R2) between VREF and GND for VPG programming, and a CRT capacitor for reset timing. Optional components include a push-button switch on PBR and external resistors for ADJ/–ADJ mode sensing. No external pull-up is needed for RST due to its push-pull architecture.