Analog Devices Inc. LTC2909ITS8-2.5#TRMPBF

Overview

LTC2909ITS8-2.5#TRMPBF 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 for core voltage supervision in industrial embedded systems and automotive ECUs.

For engineers reviewing the LTC2909ITS8-2.5#TRMPBF datasheet, LTC2909ITS8-2.5#TRMPBF pinout, LTC2909ITS8-2.5#TRMPBF application, or LTC2909ITS8-2.5#TRMPBF equivalent, key selection factors include input polarity configurability via SEL pin, buffered 1V reference for negative supply offset, glitch-filtered comparator outputs, and guaranteed reset assertion down to VCC = 0.5V.

Technical Context

The LTC2909ITS8-2.5#TRMPBF implements two independent 0.5V nominal threshold comparators whose input polarity (positive UV/negative OV or negative UV/positive OV) is selected by the three-state SEL pin (VCC/Open/GND). Each ADJ input exhibits ±15nA leakage and supports external resistor-divider programming for custom trip points.

A third fixed-threshold UVLO monitors VCC at 2.213V (±1.5%), while the open-drain RST output features programmable timeout (internal 200ms, external capacitor, or disabled), 0.15V VOL at 2500μA load, and operation down to 0.5V supply - enabled by proprietary low-voltage drive circuitry.

Key Specifications

Pinout & Package

Package: 8-lead TSOT-23 (3mm × 1.75mm), RoHS-compliant, lead-free (#TRMPBF).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G33DBVR and MAX6816EUT+T, the LTC2909ITS8-2.5#TRMPBF uniquely combines dual adjustable thresholds, polarity selection, buffered 1V reference, and VCC UVLO in a single TSOT-23 package - enabling compact, flexible supervision of mixed positive/negative rails without external references or level shifters.

Availability

LTC2909ITS8-2.5#TRMPBF is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLCs, and network server PSUs requiring stable component supply, long-term lifecycle support, and guaranteed parametric performance across –40°C to +85°C.

Supply support for LTC2909ITS8-2.5#TRMPBF 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, acquired Linear Technology in 2017 to expand precision power management and signal conditioning portfolios.

The LTC2909 product line delivers precision, low-power supply monitoring ICs targeting automotive, industrial, and computing applications where reliability under brownout, wide temperature operation, and flexible rail supervision are critical design requirements.

FAQ

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

The LTC2909ITS8-2.5#TRMPBF is rated for –40°C to +85°C (Industrial grade), with guaranteed performance including ±1.5% threshold accuracy, 50μA quiescent current, and 200ms reset timeout across this full range. Absolute maximum ratings extend to 125°C junction temperature, but specified electrical characteristics apply only within the –40°C to +85°C operating range.

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

The SEL pin on the LTC2909ITS8-2.5#TRMPBF selects one of three polarity modes: SEL = VCC configures both ADJ1 and ADJ2 for positive-polarity monitoring (UV on rising edge, OV on falling edge); SEL = GND configures both for negative-polarity (UV on falling edge, OV on rising edge); SEL = open configures ADJ1 positive and ADJ2 negative. This eliminates external level-shifting components when monitoring mixed-signature supplies.

Can the LTC2909ITS8-2.5#TRMPBF monitor negative voltages, and how is it implemented?

Yes, the LTC2909ITS8-2.5#TRMPBF monitors negative voltages using its buffered 1V REF output as a local ground reference. When SEL configures ADJ1 or ADJ2 for negative polarity, the input is connected between the negative supply and REF via an external resistor divider. The 0.5V comparator threshold then detects whether the negative rail is closer to ground than expected (UV) or farther (OV), enabling robust supervision of –5V, –12V, or –15V analog supplies.

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

The LTC2909ITS8-2.5#TRMPBF guarantees RST assertion (low state) with VCC as low as 0.5V, and specifies VOL ≤ 0.15V at 2500μA load under this condition. This ultralow-voltage reset capability ensures deterministic system reset during severe brownout events common in automotive and industrial environments, where supply collapse may occur below standard logic thresholds.

Does the LTC2909ITS8-2.5#TRMPBF require external components for basic operation?

For basic dual-rail monitoring with internal 200ms timeout, the LTC2909ITS8-2.5#TRMPBF requires only three external components: a 0.1μF bypass capacitor on VCC, an external pull-up resistor on RST, and two resistor dividers on ADJ1/ADJ2 to set trip voltages. No external reference, timing capacitor, or level-shifter is needed - the buffered 1V REF and SEL-configurable polarity enable complete functionality in minimal footprint.