Analog Devices Inc. LTC2900-2CDD#TRPBF

Overview

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

For engineers reviewing the LTC2900-2CDD#TRPBF datasheet, LTC2900-2CDD#TRPBF pinout, LTC2900-2CDD#TRPBF application, or LTC2900-2CDD#TRPBF equivalent, this page delivers verified pin functions, real-world timing behavior, confirmed voltage threshold combinations, exact DFN package dimensions, and two validated alternative parts for supply monitoring in telecom, server, and portable equipment designs.

Technical Context

The LTC2900-2CDD#TRPBF implements four independent high-accuracy comparators with user-selectable thresholds across 16 preset/adjustable combinations via VPG-resistor-divider programming. Its internal bandgap reference (1.210V ±0.018V) enables precise trip-point generation for both positive adjustable (ADJ) and negative adjustable (–ADJ) inputs.

Reset assertion is guaranteed for VCC ≥ 1V; the push-pull RST output actively drives high to V2 (not open-drain), delivering VOH ≥ 0.8·V2 at 200µA source current and VOL ≤ 0.4V at 2.5mA sink current. Manual reset propagation delay is ≤1µs, and glitch immunity prevents false triggering during supply transients.

Key Specifications

Pinout & Package

Package: 10-lead 3mm × 3mm plastic DFN (exposed pad), RoHS-compliant, θJA = 43°C/W. Pin 1 marked by top-side dot; exposed thermal pad soldered to PCB ground plane for thermal and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC2901CMS#PBF, LTC2900-2CDD#TRPBF offers smaller DFN footprint and simpler reset-only function, while LTC1326CMS8#PBF trades channel count and adjustability for ultra-compact size and tighter threshold tolerance - making each optimal for distinct subsystem supervision priorities.

Availability

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

Supply support for LTC2900-2CDD#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 full product support, documentation, and manufacturing continuity for the LTC portfolio.

The LTC2900 family was designed specifically for high-accuracy, low-power quad-voltage supervision in space-constrained multirail systems - emphasizing programmability, glitch immunity, and robust reset behavior across commercial and industrial temperatures.

FAQ

What is the RST output structure of the LTC2900-2CDD#TRPBF?

The LTC2900-2CDD#TRPBF features a push-pull RST output that actively drives high to V2 (VOH ≥ 0.8·V2 at 200µA) and low to ≤0.4V at 2.5mA sink current. Unlike the open-drain LTC2900-1, this eliminates the need for an external pull-up resistor and ensures fast, deterministic logic-level transitions compatible with standard CMOS inputs.

How do I configure the LTC2900-2CDD#TRPBF to monitor a –5.2V rail?

To monitor –5.2V with the LTC2900-2CDD#TRPBF, connect the negative supply to V4 in –ADJ mode using a resistor divider between VREF (pin 8) and the –5.2V rail, with the tap point at V4. Per Table 3, use R3 = 487kΩ and R4 = 121kΩ to achieve VTRIP = –4.87V. The internal comparator references VREF to enable accurate negative-rail detection without external op-amps.

What is the minimum VCC required for valid RST operation in the LTC2900-2CDD#TRPBF?

The LTC2900-2CDD#TRPBF guarantees correct RST logic state for VCC ≥ 1V. This means the reset output remains asserted (low) until all monitored supplies exceed their thresholds and the programmed timeout expires - even during deep brownout conditions where VCC drops below 2V, ensuring safe processor shutdown sequencing.

Can the LTC2900-2CDD#TRPBF monitor fewer than four supplies?

Yes, the LTC2900-2CDD#TRPBF can monitor one to four supplies. Unused inputs (e.g., V3 or V4) should be tied above their selected threshold voltage - for example, connecting V3 to V2 in a 3-rail configuration ensures it never triggers reset. The device draws only 43µA regardless of active input count, maintaining low power consumption.

What capacitor value sets a 216ms reset timeout on the LTC2900-2CDD#TRPBF?

A 47nF capacitor connected between CRT (pin 3) and GND sets a 216ms reset timeout on the LTC2900-2CDD#TRPBF, calculated using the device's 217pF/ms scaling factor (47nF ÷ 217pF/ms ≈ 216ms). This value matches the timing shown in Figure 1 of the datasheet and is commonly used for x86 and ARM processor reset hold requirements.