Analog Devices Inc. LTC2950ITS8-2#TRPBF

Overview

LTC2950ITS8-2#TRPBF from Analog Devices (formerly Linear Technology) is a micropower pushbutton ON/OFF controller with negative-enable polarity, operating from 2.7V to 26.4V input voltage and consuming only 6µA typical quiescent current. It features independently programmable ON/OFF debounce times (32ms default + adjustable via external capacitors), a KILL input for µP-controlled graceful shutdown, and an open-drain EN output that asserts low on valid power-on event-designed for reliable power sequencing in battery-powered portable instrumentation and industrial embedded systems.

For engineers reviewing the LTC2950ITS8-2#TRPBF datasheet, LTC2950ITS8-2#TRPBF pinout, LTC2950ITS8-2#TRPBF application, or LTC2950ITS8-2#TRPBF equivalent, key selection considerations include its –40°C to +85°C industrial temperature grade, TSOT-23-8 package, 0.6V KILL comparator threshold, 1024ms fixed KILL turn-off delay, and compatibility with high-voltage PB inputs up to 26.4V.

Technical Context

The LTC2950ITS8-2#TRPBF implements a dual-stage power sequencing architecture: a 32ms internal debounce timer augmented by external ONT/OFFT capacitors (e.g., 0.033µF adds ~11.5ms), followed by a 512ms KILL blanking window after EN assertion to ensure DC/DC converter and µP startup completion. Its KILL input has a precise 0.6V threshold with 30mV hysteresis and supports voltage monitoring or µP handshake.

It uses an open-drain EN output with 0.4V max VOL at 3mA sink, compatible with DC/DC shutdown pins or external pull-ups; the INT output provides µP interrupt signaling during power-off initiation, while PB tolerates ±10kV HBM ESD and operates down to –6V.

Key Specifications

Pinout & Package

Package: 8-lead TSOT-23 (3mm × 1.75mm footprint, 0.65mm pitch), lead-free, RoHS-compliant, exposed pad optional for thermal relief.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar pushbutton power control applications.

Compared with LTC2950CTS8-2#TRPBF, the LTC2950ITS8-2#TRPBF offers extended temperature resilience for harsh environments, while LTC2953ITS8-2#TRPBF adds voltage supervision - making the LTC2950ITS8-2#TRPBF optimal for cost-constrained industrial applications needing only core ON/OFF control and KILL handshake.

Availability

LTC2950ITS8-2#TRPBF is available at Aetrix Electronics and suitable for portable instrumentation meters, industrial embedded controllers, and blade server management cards requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LTC2950ITS8-2#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 LTC2950 series was designed specifically for ultra-low-power, high-voltage pushbutton power sequencing in space-constrained portable and industrial systems - emphasizing robustness, precision timing, and minimal external component count.

FAQ

What is the maximum input voltage rating for the PB pin on the LTC2950ITS8-2#TRPBF?

The PB pin on the LTC2950ITS8-2#TRPBF supports –6V to +26.4V, enabling direct connection to high-voltage rails without level-shifting. This specification is confirmed in the Absolute Maximum Ratings table and allows use with 24V industrial buses or reverse-battery-tolerant designs when combined with series resistance. The internal 100kΩ pull-up ensures reliable logic-level detection even with external pull-down switches.

How does the KILL input function during power-on sequencing of the LTC2950ITS8-2#TRPBF?

During power-on, the KILL input on the LTC2950ITS8-2#TRPBF is blanked for 512ms (tKILL, ON BLANK) after EN assertion. If KILL remains below 0.6V at the end of this period, EN is released to abort startup - ensuring the µP and DC/DC converter have completed initialization before accepting KILL commands. This behavior is hard-coded and non-adjustable per the datasheet timing diagrams.

Can the LTC2950ITS8-2#TRPBF operate from a single 3.3V supply?

Yes, the LTC2950ITS8-2#TRPBF operates from 2.7V to 26.4V, so a 3.3V supply is fully supported. At 3.3V, quiescent current remains 6µA typical, and all timing parameters (e.g., 32ms default debounce) retain full accuracy. The PB pin's internal pull-up functions correctly, and EN output VOL stays ≤0.4V at 3mA load - ensuring compatibility with 3.3V logic interfaces and buck converter enable pins.

What is the purpose of the ONT and OFFT pins on the LTC2950ITS8-2#TRPBF?

The ONT and OFFT pins on the LTC2950ITS8-2#TRPBF allow extension of the default 32ms turn-on and turn-off debounce intervals using external capacitors. For example, a 0.033µF capacitor on ONT adds ~11.5ms, yielding 43.5ms total - preventing false triggers from noisy or mechanically unstable buttons. These pins draw negligible current (<3.6µA) and interface directly to internal oscillators, requiring no additional biasing.

Is the LTC2950ITS8-2#TRPBF pin-compatible with the LTC2950ITS8-1#TRPBF?

Yes, the LTC2950ITS8-2#TRPBF is pin-compatible with the LTC2950ITS8-1#TRPBF - both use identical TSOT-23-8 packaging and share identical pin functions. The sole difference is EN output polarity: LTC2950ITS8-2#TRPBF asserts EN low on power-on (suitable for PFET gates or active-low enables), while LTC2950ITS8-1#TRPBF asserts EN high. No PCB changes are required for substitution if the downstream circuit accepts the alternate polarity.