Analog Devices Inc. LTC2903IS6-A1#TRPBF

Overview

LTC2903IS6-A1#TRPBF from Analog Devices (formerly Linear Technology) is a precision quad supply monitor IC in 6-lead TSOT-23 package, designed to simultaneously supervise 3.3V, 2.5V, 1.8V, and an adjustable input with ±1.5% threshold accuracy over temperature, 200ms reset timeout, and guaranteed reset assertion down to VCC = 0.5V - used in multivoltage telecom and server power sequencing.

For engineers reviewing the LTC2903IS6-A1#TRPBF datasheet, LTC2903IS6-A1#TRPBF pinout, LTC2903IS6-A1#TRPBF application, or LTC2903IS6-A1#TRPBF equivalent, key selection criteria include its four-input undervoltage detection architecture, open-drain RST output with internal weak pull-up to V2, low 20µA quiescent current, and guaranteed operation at sub-1V supply rails - critical for brownout resilience in dense power systems.

Technical Context

The LTC2903IS6-A1#TRPBF implements four independent voltage comparators referenced to a bandgap-derived 0.5V internal reference (for ADJ input) or fixed thresholds (3.3V/2.5V/1.8V), with all outputs logically OR'd into a single active-low open-drain RST signal that remains asserted until all inputs exceed their thresholds for ≥200ms. Internal VCC is autonomously generated from the higher of V1 or V2.

Its low-voltage pull-down circuit sustains RST sink capability down to 0.5V VCC (guaranteed), with VOL ≤150mV at 5µA sink current, while maintaining ±1.5% threshold accuracy across –40°C to +85°C operating range. Input currents are specified as 20–80µA on V1, 8–30µA on V2/V3, and ±30nA on V4 (adjustable).

Key Specifications

Pinout & Package

6-lead TSOT-23 (S6) package: 2.9mm × 1.6mm × 0.8–0.9mm height, JEDEC MO-193 compliant, with exposed pad not connected.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC2900CS6-3.3#TRMPBF and LTC2902IS6-3.3#TRPBF, the LTC2903IS6-A1#TRPBF uniquely provides one adjustable input (V4) referenced to 0.5V, enabling precise supervision of non-standard rails like 1.5V or 2.8V without external resistors on fixed-threshold variants - critical for legacy or custom power architectures.

Availability

LTC2903IS6-A1#TRPBF is available at Aetrix Electronics and suitable for multivoltage systems, optical networking equipment, and cell phone base stations requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LTC2903IS6-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 support, manufacturing, and documentation for the LTC portfolio.

The LTC2903 series belongs to Linear's precision power monitoring product line, engineered specifically for high-reliability multirail systems where deterministic reset timing, sub-1V operation, and ±1.5% threshold accuracy are mandatory - targeting telecom infrastructure and enterprise computing.

FAQ

What is the guaranteed minimum VCC voltage for reliable operation of the LTC2903IS6-A1#TRPBF?

The LTC2903IS6-A1#TRPBF guarantees full functionality including RST assertion and comparator operation down to VCC = 0.5V. This is explicitly specified in the Absolute Maximum Ratings and Electrical Characteristics tables, with VOL ≤150mV at 5µA sink current when VCC = 0.5V - enabling robust reset behavior during deep brownout conditions where other supervisors fail.

How does the LTC2903IS6-A1#TRPBF achieve ±1.5% threshold accuracy without using hysteresis?

The LTC2903IS6-A1#TRPBF achieves ±1.5% threshold accuracy without hysteresis by employing proprietary comparator transient filtering and precision bandgap referencing. Instead of degrading accuracy with hysteresis, it uses electronic integration of transient events and requires both magnitude and duration compliance (e.g., >1% overdrive for >150µs) to trigger reset - preserving true threshold fidelity while rejecting noise.

Can the LTC2903IS6-A1#TRPBF monitor negative voltages such as –5.2V?

No, the LTC2903IS6-A1#TRPBF is configured for 3.3V/2.5V/1.8V/ADJ positive rail monitoring only. The –5.2V capability is exclusive to the LTC2903-C1 variant (e.g., LTC2903IS6-C1#TRPBF), which has different internal threshold networks and absolute maximum ratings for V4 (–6.5V to 0.3V). Using LTC2903IS6-A1#TRPBF for negative rails violates absolute maximum ratings and will damage the device.

What is the purpose of the internal ~10µA pull-up on the RST pin of the LTC2903IS6-A1#TRPBF?

The internal ~10µA pull-up on the RST pin of the LTC2903IS6-A1#TRPBF connects to V2 and provides basic logic-high bias when no external pull-up is present. It enables immediate reset release upon power-up without requiring external components in simple applications, though an external resistor is recommended for faster rise times or when pulling RST to a voltage higher than V2.

Does the LTC2903IS6-A1#TRPBF require external capacitors on all voltage inputs?

The LTC2903IS6-A1#TRPBF requires a 0.1µF ceramic bypass capacitor on V1 and V2 to stabilize the internally generated VCC; V3 and V4 do not require bypassing unless operating in extremely noisy environments. The datasheet explicitly states "bypass V1 and V2" and shows 0.1µF caps in all typical application circuits - omitting them risks VCC instability and erratic reset behavior.