Analog Devices Inc. LTC2903CS6-A1#TRPBF

Overview

LTC2903CS6-A1#TRPBF from Analog Devices (formerly Linear Technology) is a precision quad supply monitor IC in 6-lead TSOT-23 package, designed to supervise 3.3V, 2.5V, 1.8V, and one adjustable voltage rail simultaneously. It guarantees ±1.5% threshold accuracy over temperature, features 200ms reset timeout, ultralow 0.5V VCC operation, and active-low open-drain RST output - enabling reliable power-up sequencing and brownout protection in multivoltage telecom and server systems.

For engineers reviewing the LTC2903CS6-A1#TRPBF datasheet, LTC2903CS6-A1#TRPBF pinout, LTC2903CS6-A1#TRPBF application, or LTC2903CS6-A1#TRPBF equivalent, key selection criteria include its fixed 3.3V/2.5V/1.8V thresholds with ADJ fourth input, 10% undervoltage detection tolerance, 20µA quiescent current, guaranteed reset assertion down to 0.5V VCC, and compatibility with noisy multirail environments requiring glitch immunity and no hysteresis-induced accuracy loss.

Technical Context

The LTC2903CS6-A1#TRPBF implements four independent comparators referenced to an internal bandgap, each monitoring a dedicated input (V1–V4) against factory-trimmed thresholds: 2.921V (3.3V, ±1.5%), 2.213V (2.5V, ±1.5%), 1.593V (1.8V, ±1.5%), and 0.500V (ADJ). Its internal VCC is autonomously generated from the higher of V1 or V2, enabling operation even when only one supply is present above 0.5V.

Reset logic holds RST low until all four inputs exceed their thresholds for a continuous 200ms period; the open-drain RST output includes a weak internal pull-up to V2 (10µA typical), with pulldown capability sustained down to 0.2V on V1/V2/V3. No hysteresis is used - noise rejection relies on comparator transient filtering and the 200ms timeout window.

Key Specifications

Pinout & Package

Package: 6-lead TSOT-23 (ThinSOT™), 1mm profile, JEDEC MO-193 compliant. Pin 1 marked with dot; pin 1–6 arranged linearly with GND at pin 2.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC2900CS6#TRPBF and LTC2902CS6-3.3#TRPBF, the LTC2903CS6-A1#TRPBF delivers optimized cost and simplicity for fixed-threshold quad monitoring - eliminating configuration overhead while retaining identical accuracy, low-VCC operation, and noise immunity.

Availability

LTC2903CS6-A1#TRPBF is available at Aetrix Electronics and suitable for optical networking systems, cell phone base stations, and network servers requiring stable component supply, long-term lifecycle support, and guaranteed parametric compliance across temperature.

Supply support for LTC2903CS6-A1#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 continuity, technical documentation, and manufacturing for the LTC supervisory portfolio.

The LTC2903 series was designed specifically for precision multivoltage system supervision in telecom infrastructure and high-reliability computing - emphasizing threshold accuracy, low-VCC operation, and noise-immune reset generation without hysteresis trade-offs.

FAQ

What is the guaranteed reset threshold accuracy of the LTC2903CS6-A1#TRPBF over temperature?

The LTC2903CS6-A1#TRPBF guarantees ±1.5% threshold accuracy over its full operating temperature range (0°C to 70°C for C-grade), referenced to each monitored voltage (e.g., 2.921V ±1.5% for the 3.3V input). This applies to all four inputs - V1 (3.3V), V2 (2.5V), V3 (1.8V), and V4 (adjustable) - and is specified without hysteresis, preserving true accuracy for tight system voltage margining.

Can the LTC2903CS6-A1#TRPBF operate with VCC below 1V, and what is the minimum functional VCC?

Yes, the LTC2903CS6-A1#TRPBF is guaranteed to assert RST down to VCC = 0.5V, with typical operation extending to 0V. Its internal low-voltage pulldown circuit uses V1, V2, and V3 to maintain RST low even when only one supply is present above 0.2V - a key differentiator for brownout resilience not found in standard supervisors.

How does the LTC2903CS6-A1#TRPBF handle noise on monitored supply lines without using hysteresis?

The LTC2903CS6-A1#TRPBF avoids hysteresis to preserve threshold accuracy and instead employs two noise mitigation techniques: (1) proprietary comparator transient response shaping that rejects short-duration glitches (see Fig. 5), and (2) a 200ms reset timeout that requires all inputs to remain above threshold continuously - effectively filtering low-frequency noise below ~5Hz.

What is the function of the V4 pin on the LTC2903CS6-A1#TRPBF, and how is it configured?

V4 on the LTC2903CS6-A1#TRPBF is an adjustable input referenced to an internal 0.5V bandgap. To monitor a custom voltage (e.g., 12V), connect a resistor divider (R1/R2) between the supply and GND, with the divider tap connected to V4. The trip point is calculated as VTRIP = 0.5 × (1 + R1/R2), enabling precise supervision of nonstandard rails without external components beyond the divider.

Does the LTC2903CS6-A1#TRPBF require external bypass capacitors, and where should they be placed?

Yes - a 0.1µF ceramic capacitor is required from V1 to GND and from V2 to GND to stabilize the internal VCC generation circuit (derived from the higher of V1/V2). For noisy environments, additional 0.1µF capacitors are recommended on V3 and V4. Options D1/E1 require bypass only on V1; the LTC2903CS6-A1#TRPBF follows the A1 configuration requiring dual bypass.