Analog Devices Inc. LTC2951IDDB-1#TRMPBF

Overview

LTC2951IDDB-1#TRMPBF from Analog Devices (acquired 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 −40°C to +85°C operating temperature. It enables controlled system power sequencing in battery-powered portable instrumentation and embedded computing by managing DC/DC converter enable states via PB and KILL handshaking.

For engineers reviewing the LTC2951IDDB-1#TRMPBF datasheet, LTC2951IDDB-1#TRMPBF pinout, LTC2951IDDB-1#TRMPBF application, or LTC2951IDDB-1#TRMPBF equivalent, key selection criteria include its fixed 128ms turn-on debounce, adjustable KILL timeout for fault-safe shutdown, EN polarity (high-true), DFN-8 package compatibility, and ±10kV HBM ESD rating on PB input.

Technical Context

The LTC2951IDDB-1#TRMPBF implements a deterministic state machine for pushbutton-initiated power control: PB falling triggers a 128ms turn-on debounce before asserting EN; KILL input provides µP-controlled or voltage-monitoring–based release of EN; INT output signals µP to perform graceful shutdown prior to automatic EN release. Its internal 512ms KILL blanking window ensures stable power-up before KILL sampling.

Timing is governed by internal oscillators and externally programmable RC networks on OFFT (adjustable turn-off delay) and KILLT (adjustable KILL timeout). The device features accurate 0.6V KILL threshold, 0.6V PB threshold, and 2.2V–2.4V VIN undervoltage lockout with 50–600mV hysteresis - all specified over −40°C to +85°C.

Key Specifications

Pinout & Package

Package: 8-lead 3mm × 2mm plastic DFN (DDB), exposed pad optional for thermal relief or 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 MAX16054ATA+T, the LTC2951IDDB-1#TRMPBF uniquely integrates pushbutton debounce, µP handshake (INT/KILL), and failsafe KILL timeout in a single 3mm×2mm DFN - enabling compact, reliable, and standards-compliant power sequencing for portable and industrial systems.

Availability

LTC2951IDDB-1#TRMPBF is available at Aetrix Electronics and suitable for portable instrumentation meters, blade servers, and desktop/notebook computers requiring stable component supply, extended temperature operation, and low-quiescent-power pushbutton control.

Supply support for LTC2951IDDB-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, Inc. (ADI) designs precision analog, mixed-signal, and digital signal processing ICs for industrial, automotive, communications, and healthcare applications.

The LTC2951 product line delivers micropower pushbutton ON/OFF controllers with integrated timing, fault-handling, and wide-VIN operation - specifically engineered for reliable, low-energy power sequencing in portable and harsh-environment electronics.

FAQ

What is the EN output polarity of LTC2951IDDB-1#TRMPBF?

The LTC2951IDDB-1#TRMPBF features a high-true open-drain EN output: it asserts high (pulled up externally) after a valid pushbutton turn-on event and releases low to disable the downstream power supply. This distinguishes it from the LTC2951-2 variant, which provides low-true EN. The EN pin operates from 0V to 10V and requires an external pull-up resistor unless interfacing with a DC/DC converter that provides internal pull-up.

How does the KILL input function in LTC2951IDDB-1#TRMPBF during power-up?

During power-up, the KILL input of LTC2951IDDB-1#TRMPBF is blanked for 512ms (t_{KILL,ON BLANK}) after EN asserts high. During this period, KILL transitions are ignored to allow sufficient time for the DC/DC converter and µP to stabilize. If KILL remains below 0.6V at the end of this window, EN is released, aborting power-on. This ensures deterministic startup behavior and prevents spurious shutdown due to slow-rising control signals.

Can LTC2951IDDB-1#TRMPBF operate from a single-cell Li-ion battery?

Yes, LTC2951IDDB-1#TRMPBF supports input voltages from 2.7V to 26.4V, fully covering the discharge range of a single-cell Li-ion battery (typically 4.2V down to ~2.8V). Its 2.2V–2.4V undervoltage lockout with hysteresis prevents erratic operation near end-of-discharge, and its 6µA quiescent current minimizes battery drain during standby - making it ideal for long-life portable devices powered by Li-ion cells.

What external components are required for basic operation of LTC2951IDDB-1#TRMPBF?

For basic operation, LTC2951IDDB-1#TRMPBF requires only an external pull-up resistor on the EN pin (unless the connected DC/DC converter provides internal pull-up) and a momentary switch between PB and GND. Optional components include capacitors on OFFT and KILLT pins to extend turn-off debounce and KILL timeout, respectively. No external resistors are needed on PB due to its internal 100kΩ pull-up, though a 10kΩ resistor to VIN is recommended if board leakage exceeds 2µA.

Is the DFN package of LTC2951IDDB-1#TRMPBF compatible with standard reflow profiles?

Yes, the 3mm × 2mm DFN package of LTC2951IDDB-1#TRMPBF is qualified for standard Pb-free reflow soldering per JEDEC J-STD-020. Its maximum junction temperature is 125°C, and thermal resistance θ_JA is 165°C/W with standard PCB layout. The exposed pad (Pin 9) may be left unconnected or soldered to GND for improved thermal performance - no special profile deviations are required for volume manufacturing.