Analog Devices Inc. LTC2954ITS8-1#TRPBF

Overview

LTC2954ITS8-1#TRPBF from Analog Devices (formerly Linear Technology) is a pushbutton on/off controller IC that manages system power sequencing via a momentary switch interface. It features an open-drain high-true enable output (EN), debounced interrupt output (INT), and a 0.6V-threshold KILL input for microprocessor handshaking. Operating from 2.7V to 26.4V with 6μA quiescent current, it enables reliable power control in battery-powered portable instrumentation and industrial edge devices.

For engineers reviewing the LTC2954ITS8-1#TRPBF datasheet, LTC2954ITS8-1#TRPBF pinout, LTC2954ITS8-1#TRPBF application, or LTC2954ITS8-1#TRPBF equivalent, key selection criteria include its –40°C to +85°C temperature grade, TSOT-23-8 package, adjustable ONT/PDT timing capacitors, low-leakage EN output compatible with DC/DC shutdown pins, and ±10kV HBM ESD rating on PB.

Technical Context

The LTC2954ITS8-1#TRPBF implements independent turn-on (ONT) and turn-off (PDT) timing paths using external capacitors to set debounce delays-defaulting to 32ms (tDB,ON) and 64ms (tPD,MIN) respectively. Its KILL input provides μP-controlled power-down with 512ms turn-on blanking to ensure safe system startup before KILL monitoring begins.

It uses internal oscillators and digital logic to generate precise timing windows: INT asserts 32ms after PB fall and remains active during PB hold; EN toggles only after validated PB press duration exceeds tDB,ON + tONT; and KILL propagation delay is 30μs with 10mV hysteresis for noise immunity.

Key Specifications

Pinout & Package

Package: 8-Lead Plastic TSOT-23 (3mm × 1.75mm footprint), RoHS-compliant, lead-free finish, exposed pad not present in TSOT-23 variant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G33DBVR and MAX6816EUT+T, the LTC2954ITS8-1#TRPBF integrates complete pushbutton-driven power sequencing-including configurable timing, μP handshaking, and hardware-enforced fail-safes-reducing firmware burden and PCB area versus discrete solutions.

Availability

LTC2954ITS8-1#TRPBF is available at Aetrix Electronics and suitable for portable instrumentation meters, blade servers, desktop/notebook auxiliary power rails, and ruggedized PDAs requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LTC2954ITS8-1#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 LTC2954 series was designed specifically for robust, low-power pushbutton-based system power management-targeting applications where reliability, ESD immunity, and hands-off sequencing are critical.

FAQ

What is the operating temperature range of the LTC2954ITS8-1#TRPBF?

The LTC2954ITS8-1#TRPBF is rated for –40°C to +85°C operation, making it suitable for industrial, automotive under-hood adjacent, and outdoor embedded applications. This grade corresponds to the "I" suffix in the part numbering scheme and is validated per Analog Devices' industrial qualification standards.

How does the KILL input function during power-up of the LTC2954ITS8-1#TRPBF?

During power-up, the KILL input is blanked for 512ms (tKILL,ON BLANK) to allow the connected DC/DC converter and microprocessor to stabilize. If KILL remains low after this period, the LTC2954ITS8-1#TRPBF releases the EN output, aborting startup. This prevents incomplete initialization due to premature KILL assertion.

Can the LTC2954ITS8-1#TRPBF be used without a microprocessor?

Yes-the LTC2954ITS8-1#TRPBF supports standalone operation. With KILL tied to a resistor divider or pulled high, it performs basic pushbutton on/off control. The INT output may be left unconnected, and EN directly drives a DC/DC converter's shutdown pin, enabling fully hardware-managed power sequencing.

What is the maximum voltage the PB pin of the LTC2954ITS8-1#TRPBF can tolerate?

The PB pin of the LTC2954ITS8-1#TRPBF withstands –6V to +33V, exceeding standard supply rails. This allows direct connection to higher-voltage buses or noisy mechanical switches without external clamping diodes, and supports ±10kV HBM ESD protection-critical for handheld and field-service equipment.

How do I configure the turn-on delay using the ONT pin on the LTC2954ITS8-1#TRPBF?

To set the additional turn-on delay beyond the 32ms default, connect a capacitor from ONT (Pin 3) to GND. Delay scales at 6.4 seconds per microfarad (e.g., 15nF yields ~96ms added delay). Floating ONT reverts to the internal 32ms debounce; no resistor is required-only the capacitor defines timing.