Analog Devices Inc. LTC2900-2IMS#TRPBF

Overview

LTC2900-2IMS#TRPBF from Analog Devices (acquired Linear Technology) is a programmable quad supply monitor IC with push-pull RST output, simultaneously supervising up to 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-on reset supervisor in multivoltage embedded systems.

For engineers reviewing the LTC2900-2IMS#TRPBF datasheet, LTC2900-2IMS#TRPBF pinout, LTC2900-2IMS#TRPBF application, or LTC2900-2IMS#TRPBF equivalent, key selection criteria include its push-pull RST output (vs open-drain variants), guaranteed RST validity down to VCC = 1V, 16-programmable voltage threshold combinations, and MSOP-10 package compatibility with space-constrained PCB layouts.

Technical Context

The LTC2900-2IMS#TRPBF implements four independent high-accuracy comparators with user-selectable thresholds via a ratiometric resistor divider on VPG, referencing a buffered 1.210V internal bandgap (VREF). Its architecture guarantees glitch immunity and correct RST state during brownout, power-up, and power-down sequences.

Unlike the LTC2900-1, the -2 variant features an actively driven push-pull RST output referenced to V2 - enabling faster rise times (~206ns for 150pF load) without external pull-up components. The manual reset (PBR) input integrates debouncing via the CRT timing capacitor, and programming occurs within a 150µs window after VCC exceeds 2.42V.

Key Specifications

Pinout & Package

Package: 10-lead MSOP (plastic, exposed pad not present), 3mm × 3mm body, 0.5mm lead pitch, JEDEC MO-187 variation. Pin 1 marked by dot or beveled edge; leads coplanar ≤ 0.102mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC2901CMS#PBF and LTC1326CS8#TRPBF, the LTC2900-2IMS#TRPBF uniquely balances quad-rail programmability, push-pull RST drive, and MSOP-10 compactness - making it optimal for multivoltage systems needing precise, low-power, and layout-efficient reset control without watchdog overhead.

Availability

LTC2900-2IMS#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 LTC2900-2IMS#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. (ADI) is a global semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies, with heritage from Linear Technology's precision power management portfolio.

The LTC2900 family was designed specifically for multivoltage system supervision - delivering programmable accuracy, low quiescent current, and flexible rail configuration in compact packages for computing, communications, and industrial applications.

FAQ

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

The LTC2900-2IMS#TRPBF features a push-pull RST output actively driven to V2, enabling faster rise times (<210ns) and eliminating the need for an external pull-up resistor. In contrast, the LTC2900-1IMS#TRPBF uses an open-drain RST with weak internal pull-up (~6µA), requiring external pull-up for logic-level compatibility. This makes the LTC2900-2IMS#TRPBF preferable for direct CMOS interfacing and high-speed reset release.

Can LTC2900-2IMS#TRPBF monitor negative voltage rails?

Yes - the LTC2900-2IMS#TRPBF supports negative rail monitoring in –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 or –11.30V. The internal comparator references ground, and VREF provides level-shifting; minimum R4 is 1.21kΩ to stay within VREF's ±1mA sourcing limit.

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

The LTC2900-2IMS#TRPBF guarantees correct RST logic state (active-low assertion) for VCC ≥ 1V. This ensures reliable reset hold during deep brownout conditions - critical for preserving register states and preventing undefined processor behavior. Internal circuitry remains functional down to this threshold, and RST remains low until all monitored rails exceed their programmed thresholds and the CRT timeout expires.

How is the reset timeout period set on LTC2900-2IMS#TRPBF?

The reset timeout on LTC2900-2IMS#TRPBF is set by an external capacitor (CRT) connected between Pin 3 (CRT) and GND. The relationship is tRST ≈ CRT × 217 × 10⁹ (CRT in farads, tRST in seconds), or equivalently 217pF per millisecond. For example, a 47nF capacitor yields ~216ms delay. Leaving CRT unconnected defaults to ~50µs. Ceramic capacitors with low leakage are recommended for timing accuracy.

Does LTC2900-2IMS#TRPBF require external bypass capacitors, and where should they be placed?

Yes - LTC2900-2IMS#TRPBF requires ≥0.1µF ceramic bypass capacitors from both V1 and V2 pins to GND. This is mandatory because the greater of V1 or V2 serves as the internal VCC supply; insufficient decoupling risks erratic reset behavior or false triggering during transients. V3 and V4 inputs may optionally include filter capacitors, but V1/V2 bypassing is non-negotiable per the datasheet.