Analog Devices Inc. LTC2903CS6-C1#TRPBF

Overview

LTC2903CS6-C1#TRPBF from Analog Devices (formerly Linear Technology) is a precision quad supply monitor IC in a 6-lead TSOT-23 package, designed to simultaneously supervise 5V, 3.3V, 1.8V, and –5.2V rails with ±1.5% threshold accuracy over temperature. It features an active-low open-drain RST output with 200ms reset timeout, ultralow 0.5V guaranteed reset operation, and power supply glitch immunity - deployed in multivoltage telecom infrastructure and network servers.

For engineers reviewing the LTC2903CS6-C1#TRPBF datasheet, LTC2903CS6-C1#TRPBF pinout, LTC2903CS6-C1#TRPBF application, or LTC2903CS6-C1#TRPBF equivalent, key selection criteria include its negative-voltage monitoring capability (–5.2V rail), guaranteed low-VCC reset down to 0.5V, 10% undervoltage detection tolerance, 20µA typical quiescent current, and SOT-23 footprint compatibility for space-constrained power sequencing designs.

Technical Context

The LTC2903CS6-C1#TRPBF implements four independent voltage comparators referenced to a bandgap core, each with fixed thresholds: V1 = 4.425V (5V, 10%), V2 = 2.921V (3.3V, 10%), V3 = 1.593V (1.8V, 10%), and V4 = –4.602V (–5.2V, 10%). Internal VCC is generated from the higher of V1 or V2, enabling autonomous operation without external bias.

Its reset logic holds RST low until all four inputs exceed their thresholds for a continuous 200ms window, with built-in transient filtering that rejects comparator overdrive events shorter than 150µs at 1% threshold deviation. The RST output uses an internal weak pull-up to V2 (10µA typical) and delivers strong low-side drive down to 0.15V at 5µA sink current with VCC = 0.5V.

Key Specifications

Pinout & Package

Package: 6-lead TSOT-23 (ThinSOT™), 1.0mm max height, JEDEC MO-193 compliant, footprint compatible with standard SOT-23 layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC2903IS6-C1, the LTC2903CS6-C1#TRPBF offers identical functionality at commercial temperature grade, reducing cost where extended thermal range is unnecessary; versus LTC2900CS6-5, it provides guaranteed –5.2V supervision without resistor programming, simplifying layout and validation for fixed-rail telecom systems.

Availability

LTC2903CS6-C1#TRPBF is available at Aetrix Electronics and suitable for multivoltage systems, optical networking equipment, and cell phone base stations requiring stable component supply with guaranteed –5.2V rail monitoring capability.

Supply support for LTC2903CS6-C1#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 LTC2903 series is a precision quad supply monitor product line engineered specifically for high-reliability power sequencing and fault detection in telecom, networking, and industrial infrastructure where fixed-threshold accuracy and negative-rail supervision are critical.

FAQ

What is the guaranteed minimum VCC voltage for reliable RST assertion in LTC2903CS6-C1#TRPBF?

The LTC2903CS6-C1#TRPBF guarantees RST assertion down to 0.5V VCC, meaning it will reliably pull RST low even when the greater of V1 or V2 drops to 0.5V. This is confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables, where VOL is specified at VCC = 0.5V, IRST = 5µA, yielding ≤150mV. This capability ensures deterministic reset behavior during deep brownout conditions on primary supply rails.

Does LTC2903CS6-C1#TRPBF support monitoring of negative supply voltages?

Yes, LTC2903CS6-C1#TRPBF explicitly supports –5.2V rail monitoring via Pin 5 (V4), with a guaranteed threshold range of –4.680V to –4.524V (–5.2V ±10%). The Absolute Maximum Ratings confirm V4 accepts –6.5V to 0.3V, and the Block Diagram shows dedicated comparator circuitry for V4. This makes LTC2903CS6-C1#TRPBF unique among quad supervisors in supporting native negative-voltage supervision without external level-shifting components.

What is the reset timeout period for LTC2903CS6-C1#TRPBF and how is it implemented?

The LTC2903CS6-C1#TRPBF has a nominal reset timeout period of 200ms, with guaranteed range of 140ms to 260ms over temperature. This is implemented via an internal delay generator that starts counting only after all four input voltages (V1–V4) have exceeded their respective thresholds for a continuous interval. If any input falls below threshold during the count, the timer resets - providing robust immunity to transient dips during power-up or brownout recovery.

How does the internal VCC generation work in LTC2903CS6-C1#TRPBF?

In LTC2903CS6-C1#TRPBF, internal VCC is autonomously generated from the higher voltage between V1 and V2 pins - no external supply is needed. As stated in Note 3 of the datasheet, "The internal supply voltage (VCC) is generated from the greater voltage on the V1 and V2 inputs." This architecture allows the device to remain functional even if one rail is absent or fails, provided the other is within valid range (–0.3V to 6.5V), making it ideal for redundant or asymmetric power systems.

What are the key differences between LTC2903CS6-C1#TRPBF and LTC2903IS6-C1?

The LTC2903CS6-C1#TRPBF and LTC2903IS6-C1 share identical electrical specifications, pinout, and functionality, differing only in operating temperature range: LTC2903CS6-C1#TRPBF is rated for 0°C to 70°C (commercial grade), while LTC2903IS6-C1 extends to –40°C to 85°C (industrial grade). Both use the same S6 package and #TRPBF tape-and-reel packaging format. Selection depends solely on environmental operating requirements, not performance or feature set.