Analog Devices Inc. LTC2951CDDB-1#TRPBF

Overview

LTC2951CDDB-1#TRPBF from Analog Devices (formerly Linear Technology) is a micropower pushbutton ON/OFF controller with open-drain high-true EN output, 2.7V–26.4V input range, 6µA quiescent current, and 128ms fixed turn-on debounce. It interfaces between mechanical pushbuttons and DC/DC converters in battery-powered portable instrumentation and embedded systems requiring graceful power sequencing.

For engineers reviewing the LTC2951CDDB-1#TRPBF datasheet, LTC2951CDDB-1#TRPBF pinout, LTC2951CDDB-1#TRPBF application, or LTC2951CDDB-1#TRPBF equivalent, key selection criteria include EN polarity (high-true), KILL input threshold (0.6V), adjustable KILLT/OFFT timing capacitors, and DFN-8 (3mm × 2mm) package compatibility with space-constrained designs.

Technical Context

The LTC2951CDDB-1#TRPBF implements a dual-stage power control architecture: a 128ms fixed turn-on debounce timer followed by a 512ms KILL blanking window to ensure system power-up stability before µP handshaking begins. Its PB input features ±10kV HBM ESD protection and operates up to 26.4V without external pull-up.

Power-off sequencing uses cascaded timing: internal 32ms turn-off debounce (tDB,OFF), optional OFFT capacitor for extended hold time, then INT assertion followed by configurable KILL timeout (128ms default + adjustable via KILLT capacitor). The EN output releases only after KILL is asserted low or the full KILL timeout expires.

Key Specifications

Pinout & Package

Package: 8-lead plastic DFN (3mm × 2mm), exposed pad (pin 9), 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 MAX16054ATA+T, the LTC2951CDDB-1#TRPBF uniquely integrates programmable turn-on/off debounce, KILL-based fail-safe shutdown, and µP handshaking (INT/KILL) in a single DFN-8 package-enabling robust, low-power, and field-deployable power sequencing.

Availability

LTC2951CDDB-1#TRPBF is available at Aetrix Electronics and suitable for portable instrumentation meters, blade servers, and desktop/notebook computers requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for LTC2951CDDB-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 its precision analog and power management portfolio with rigorous automotive and industrial qualification standards.

The LTC2951 series was designed specifically for intelligent pushbutton power control in battery-operated and high-reliability embedded systems-emphasizing ultra-low quiescent current, wide input voltage tolerance, and configurable timing for safe system startup/shutdown.

FAQ

What is the EN output polarity of LTC2951CDDB-1#TRPBF?

The LTC2951CDDB-1#TRPBF features a high-true EN output: it asserts high after a valid 128ms pushbutton press and releases low upon KILL assertion or timeout expiration. This matches standard DC/DC converter enable inputs that activate on logic-high signals, eliminating need for inverters in most designs.

How does the KILL input function in LTC2951CDDB-1#TRPBF power sequencing?

In LTC2951CDDB-1#TRPBF, the KILL input serves dual roles: during normal operation, pulling KILL low immediately releases EN to shut down power; during startup, KILL must go high within 512ms of EN assertion to prevent automatic abort. Its 0.6V threshold also enables direct battery voltage monitoring via resistor divider.

Can LTC2951CDDB-1#TRPBF operate from a single-cell Li-ion battery?

Yes, LTC2951CDDB-1#TRPBF supports input voltages from 2.7V to 26.4V, covering the full discharge range of a single-cell Li-ion battery (4.2V down to ~2.8V). Its 6µA quiescent current minimizes drain during standby, enabling multi-year operation on typical coin-cell or small Li-ion packs.

What is the purpose of the OFFT pin on LTC2951CDDB-1#TRPBF?

The OFFT pin on LTC2951CDDB-1#TRPBF accepts an external capacitor to extend the internal 32ms turn-off debounce time. For example, a 1500pF capacitor adds 11.5ms, requiring PB to remain low for 43.5ms total before initiating power-down-preventing false shutdown from brief button presses or noise.

Is the DFN package of LTC2951CDDB-1#TRPBF thermally enhanced?

Yes, the DFN-8 (3mm × 2mm) package of LTC2951CDDB-1#TRPBF includes an exposed pad (pin 9) that may be soldered to PCB ground for improved thermal dissipation. While not mandatory, connecting this pad reduces θJA from 165°C/W to lower effective values, supporting reliable operation at ambient temperatures up to 70°C.