Analog Devices Inc. LTC2954CDDB-1#TRMPBF

Overview

LTC2954CDDB-1#TRMPBF from Analog Devices (formerly Linear Technology) is a pushbutton on/off controller IC with µP interrupt output and power-kill input, designed for reliable system power sequencing in battery-powered and industrial embedded systems. It features low 6 μA quiescent current, wide 2.7 V to 26.4 V input voltage range, and an open-drain high-true EN output optimized for DC/DC converter shutdown control. It is used in portable instrumentation, blade servers, and notebook computers to replace mechanical power switches with debounced, timer-controlled digital power management.

For engineers reviewing the LTC2954CDDB-1#TRMPBF datasheet, LTC2954CDDB-1#TRMPBF pinout, LTC2954CDDB-1#TRMPBF application, or LTC2954CDDB-1#TRMPBF equivalent, key selection criteria include its −1 variant's low-leakage EN output (±0.1 μA at 1 V), accurate 0.6 V KILL threshold, 32 ms default turn-on debounce, and DFN-8 (3 mm × 2 mm) package compatibility with space-constrained PCB layouts.

Technical Context

The LTC2954CDDB-1#TRMPBF implements independent, capacitor-adjustable timing for power-on (ONT pin) and power-off (PDT pin), with internal 32 ms turn-on and 64 ms turn-off debounce timers. Its PB input withstands ±10 kV HBM ESD and operates from −6 V to 33 V, while the KILL comparator provides precise 0.6 V threshold with 30 mV hysteresis for voltage monitoring or µP handshake.

It integrates a 512 ms KILL blanking window after EN assertion to ensure safe DC/DC and µP power-up, and a 256 ms EN lockout period after power-down to prevent premature restart. The INT output delivers a minimum 32 ms debounced interrupt pulse to request graceful µP shutdown before system power removal.

Key Specifications

Pinout & Package

Package: 8-lead plastic DFN (3 mm × 2 mm), exposed pad (optional GND connection), RoHS-compliant, lead-free finish.

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 LTC2954CDDB-1#TRMPBF uniquely integrates pushbutton debouncing, adjustable timing, µP interrupt signaling, and high-voltage enable control in a single DFN-8 package - eliminating discrete logic, timers, and level-shifters required by alternatives.

Availability

LTC2954CDDB-1#TRMPBF is available at Aetrix Electronics and suitable for portable instrumentation meters, blade servers, and notebook computers requiring stable component supply across product lifecycles.

Supply support for LTC2954CDDB-1#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 acquired Linear Technology in 2017 and maintains full technical and manufacturing continuity for the LTC portfolio, including precision analog and power management ICs.

The LTC2954 series was designed specifically for robust, low-power pushbutton-based system power control in space-constrained, battery-sensitive, and industrial-grade applications - emphasizing reliability, voltage flexibility, and µP interoperability.

FAQ

What is the function of the ONT pin on the LTC2954CDDB-1#TRMPBF?

The ONT pin on the LTC2954CDDB-1#TRMPBF sets the additional turn-on delay beyond the internal 32 ms debounce time. Connecting a capacitor to ground yields ~6.4 seconds per microfarad of extra hold time required on the PB pin before EN is asserted. With ONT floating, the LTC2954CDDB-1#TRMPBF defaults to 32 ms turn-on debounce only.

How does the KILL input work in the LTC2954CDDB-1#TRMPBF power sequence?

The KILL input on the LTC2954CDDB-1#TRMPBF is an active-low command that releases the EN output to power down the system. After EN is asserted, a 512 ms blanking window ignores KILL to allow safe power-up; if KILL remains low past this window, EN is released. During normal operation, asserting KILL low immediately disables EN - enabling µP-driven graceful shutdown in the LTC2954CDDB-1#TRMPBF.

Can the LTC2954CDDB-1#TRMPBF operate from a 3.3 V supply?

Yes, the LTC2954CDDB-1#TRMPBF operates from 2.7 V to 26.4 V, so it functions correctly at 3.3 V. Its 6 μA typical quiescent current and 0.6 V KILL threshold remain valid across this range. However, the PB input retains its full −6 V to 33 V tolerance and ±10 kV ESD rating regardless of VIN level - making the LTC2954CDDB-1#TRMPBF suitable for mixed-voltage systems.

What is the difference between LTC2954CDDB-1#TRMPBF and LTC2954CDDB-2#TRMPBF?

The LTC2954CDDB-1#TRMPBF features a high-true open-drain EN output intended for driving DC/DC converter shutdown pins, while the LTC2954CDDB-2#TRMPBF has a low-true EN output designed to control external PFETs in PowerPath configurations. Both share identical timing, debounce, INT, KILL, and PB characteristics - only the polarity and drive strength of the EN pin differ.

Is an external pull-up resistor required on the EN pin of the LTC2954CDDB-1#TRMPBF?

No - the LTC2954CDDB-1#TRMPBF EN pin is an open-drain output and requires an external pull-up resistor to the target DC/DC converter's enable rail (e.g., 3.3 V or VIN). The part itself does not provide internal pull-up; omission will leave EN floating and prevent proper high-true assertion. A 10–100 kΩ resistor is typical, selected based on rise-time and drive strength requirements of the downstream converter.