Analog Devices Inc. LTC2954CDDB-2#TRPBF

Overview

LTC2954CDDB-2#TRPBF from Analog Devices (formerly Linear Technology) is a pushbutton on/off controller with μP interrupt output and high-voltage open-drain enable-bar (EN) output, designed for robust system power sequencing in battery-powered and industrial equipment. It operates from 2.7V to 26.4V, draws only 6μA quiescent current, features ±10kV HBM ESD protection on PB, and delivers precise 0.6V KILL threshold voltage - enabling reliable manual and microprocessor-initiated power-down in portable instrumentation and blade servers.

For engineers reviewing the LTC2954CDDB-2#TRPBF datasheet, LTC2954CDDB-2#TRPBF pinout, LTC2954CDDB-2#TRPBF application, or LTC2954CDDB-2#TRPBF equivalent, key selection criteria include its low-leakage EN output polarity (active-low), adjustable ONT/PDT timing via external capacitors, 512ms KILL blanking window after power-on, and compatibility with high-voltage PFET-based PowerPath control.

Technical Context

The LTC2954CDDB-2#TRPBF implements independent, capacitor-adjustable turn-on (ONT) and turn-off (PDT) debounce timers - with default internal values of 32ms and 64ms respectively - plus 32ms interrupt assertion delay (tDB,OFF). Its KILL input features a 0.6V comparator threshold with 30mV hysteresis and 30μs minimum pulse width detection, enabling both software-controlled shutdown and undervoltage monitoring.

This device uses a ruggedized PB input with internal 100kΩ pull-up to 1.9V bias, supports –6V to 33V PB voltage range, and integrates a 512ms turn-on blanking timer that ignores PB and KILL inputs during initial power-up to ensure stable DC/DC converter and μP initialization before enabling system-level control.

Key Specifications

Pinout & Package

8-lead plastic DFN package (3mm × 2mm), RoHS-compliant, with optional exposed pad connected to GND for improved thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G33DBVR, LTC2954CDDB-2#TRPBF provides full pushbutton sequencing, μP handshake, and PFET drive - making it suitable for intelligent power management rather than basic reset. Compared with LTC2955IDDB-2#TRPBF, it offers lower cost and commercial-temp operation but sacrifices industrial-grade accuracy and temperature range.

Availability

LTC2954CDDB-2#TRPBF is available at Aetrix Electronics and suitable for portable instrumentation meters, blade servers, and desktop/notebook computers requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.

Supply support for LTC2954CDDB-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 LTC2954 series was designed specifically for robust, low-power pushbutton-initiated system power control with microprocessor coordination - targeting portable, industrial, and computing applications where reliability and timing precision are critical.

FAQ

What is the EN output polarity of the LTC2954CDDB-2#TRPBF?

The LTC2954CDDB-2#TRPBF features an active-low (enable-bar) open-drain EN output, meaning it pulls low to enable system power when used with a high-side PFET. This distinguishes it from the LTC2954-1 variant, which provides active-high EN. The EN pin supports voltages up to 26.4V and exhibits ≤±1μA leakage at full rated voltage - enabling direct interface with PFET gates without level shifters.

How does the KILL input function in the LTC2954CDDB-2#TRPBF power sequence?

The KILL input on the LTC2954CDDB-2#TRPBF serves two roles: first, as a μP handshake signal to release the EN output during graceful shutdown; second, as a precision 0.6V comparator for battery undervoltage monitoring. After power-on, KILL is ignored for 512ms (tKILL,ON BLANK); thereafter, pulling KILL low immediately releases EN. Its 30μs minimum pulse width and 30mV hysteresis ensure noise immunity in real-world systems.

Can the LTC2954CDDB-2#TRPBF operate without a microprocessor?

Yes - the LTC2954CDDB-2#TRPBF supports standalone operation. With KILL tied to a resistive divider or pulled low via external logic, it performs fully autonomous power-on (via PB hold) and forced power-down (via extended PB press). The PDT pin's adjustable timer enables manual override even if μP fails, and the INT output remains functional as a status indicator. No firmware or host processor is required for basic pushbutton control.

What is the purpose of the ONT and PDT pins on the LTC2954CDDB-2#TRPBF?

The ONT (turn-on timing) and PDT (power-down timing) pins on the LTC2954CDDB-2#TRPBF allow independent adjustment of pushbutton debounce intervals using external capacitors. ONT adds up to seconds of hold-time before EN assertion; PDT adds hold-time before forced EN release. Each provides ~6.4s/μF scaling. Floating either pin yields default values: 32ms (ONT) and 64ms (PDT). This prevents accidental toggling while supporting application-specific timing requirements.

What package and environmental specifications apply to the LTC2954CDDB-2#TRPBF?

The LTC2954CDDB-2#TRPBF uses an 8-lead 3mm × 2mm plastic DFN (DDB) package with exposed pad, rated for 0°C to 70°C operating temperature (C-grade). It complies with RoHS Directive 2011/65/EU and JEDEC MS-012 standards. Absolute maximum ratings include –0.3V to 33V on VIN, –6V to 33V on PB, and –0.3V to 7V on KILL - confirming suitability for industrial and battery-powered environments with transient voltage exposure.