Analog Devices Inc. LTC2909ITS8-2.5#TRPBF

Overview

LTC2909ITS8-2.5#TRPBF from Analog Devices (acquired Linear Technology) is a precision dual adjustable-input undervoltage/overvoltage monitor with fixed 2.5V VCC UVLO, ±1.5% threshold accuracy, 50μA quiescent current, and 200ms internal reset timeout - used in desktop/notebook power sequencing and automotive core voltage supervision.

For engineers reviewing the LTC2909ITS8-2.5#TRPBF datasheet, LTC2909ITS8-2.5#TRPBF pinout, LTC2909ITS8-2.5#TRPBF application, or LTC2909ITS8-2.5#TRPBF equivalent, key selection criteria include input polarity configurability via SEL pin, buffered 1V reference for negative supply offset, guaranteed 0.5V ADJ threshold accuracy over –40°C to +85°C, and ultralow 0.5V VCC operation for brownout detection.

Technical Context

The LTC2909ITS8-2.5#TRPBF implements dual 0.5V adjustable comparators with three-state SEL pin control enabling positive UV/–OV, negative UV/+OV, or dual-negative monitoring modes - all without external components. Its internal 6.5V shunt regulator allows direct connection to supplies up to 6V or higher with series resistor limiting.

Reset logic combines glitch-filtered comparator outputs with programmable timeout (internal 200ms, external capacitor, or disabled), while open-drain ⎯R⎯S⎯T output supports rail-to-rail pull-up and operates down to VCC = 0.5V with VOL ≤ 0.15V at 2500μA sink current.

Key Specifications

Pinout & Package

Package: 8-lead TSOT-23 (3mm × 1.75mm), RoHS-compliant, exposed pad optional for thermal relief.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6316US25D3+ and TPS3808G33DBVR, the LTC2909ITS8-2.5#TRPBF delivers unique dual adjustable inputs with polarity flexibility and buffered 1V reference - enabling single-chip supervision of complex multi-rail or mixed-sign systems that alternatives cannot address.

Availability

LTC2909ITS8-2.5#TRPBF is available at Aetrix Electronics and suitable for desktop computing, automotive electronics, and industrial embedded systems requiring stable component supply with guaranteed long-term availability.

Supply support for LTC2909ITS8-2.5#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 leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.

The LTC2909ITS8-2.5#TRPBF belongs to ADI's precision power monitoring product line, engineered for high-accuracy, low-power, multi-rail voltage supervision in space-constrained and thermally demanding environments.

FAQ

What is the operating temperature range for the LTC2909ITS8-2.5#TRPBF?

The LTC2909ITS8-2.5#TRPBF is rated for –40°C to +85°C (Industrial grade). This range is confirmed in the Absolute Maximum Ratings table and supported by full electrical specifications across temperature, including ±1.5% threshold accuracy and 50μA quiescent current performance.

How does the SEL pin configure input polarity on the LTC2909ITS8-2.5#TRPBF?

The SEL pin on the LTC2909ITS8-2.5#TRPBF selects ADJ1/ADJ2 polarity combinations: VCC enables dual positive UV/–OV; GND enables dual negative –UV/+OV; open circuit enables mixed polarity (ADJ1 positive, ADJ2 negative). Each configuration is validated in Table 1 of the datasheet and requires no external components.

Can the LTC2909ITS8-2.5#TRPBF monitor negative voltages?

Yes - the LTC2909ITS8-2.5#TRPBF monitors negative supplies using its buffered 1V REF output as an offset reference. When SEL = GND, both ADJ1 and ADJ2 operate in negative polarity mode, requiring input voltages below 0.5V to remain valid - enabling –5V, –12V, or –15V UV detection with external resistor networks.

What is the minimum VCC voltage required for the LTC2909ITS8-2.5#TRPBF to assert a valid reset?

The LTC2909ITS8-2.5#TRPBF guarantees ⎯R⎯S⎯T assertion down to VCC = 0.5V, with VOL ≤ 0.15V at 2500μA sink current. This ultralow-voltage operation ensures reliable brownout detection even as the supply collapses, as specified in the Electrical Characteristics table under VCC(MIN).

Does the LTC2909ITS8-2.5#TRPBF require an external timing capacitor for basic operation?

No - the LTC2909ITS8-2.5#TRPBF includes a selectable 200ms internal timeout. Tying the TMR pin to GND activates this mode, eliminating the need for external capacitors in standard applications. External capacitors are only required when custom timeout durations (e.g., 16–25ms) are needed.