Analog Devices Inc. LTC2950IDDB-1#TRPBF

Overview

LTC2950IDDB-1#TRPBF from Analog Devices (formerly Linear Technology) is a micropower pushbutton ON/OFF controller with open-drain high-true EN output, operating from 2.7V to 26.4V supply, featuring 6µA quiescent current, 32ms default turn-on debounce, and –40°C to +85°C industrial temperature range. It enables controlled power sequencing in battery-powered instrumentation and embedded systems via PB input, INT interrupt, and KILL fault-handling interface.

For engineers reviewing the LTC2950IDDB-1#TRPBF datasheet, LTC2950IDDB-1#TRPBF pinout, LTC2950IDDB-1#TRPBF application, or LTC2950IDDB-1#TRPBF equivalent, key selection criteria include EN polarity (high-true), KILL threshold accuracy (0.6V ±30mV), internal 512ms turn-on blanking timer, and DFN-8 (3mm × 2mm) package compatibility with space-constrained PCB layouts.

Technical Context

The LTC2950IDDB-1#TRPBF implements a dual-stage power control architecture: first, a robust pushbutton interface with independently programmable ON/OFF debounce timing via external capacitors on ONT/OFFT pins; second, a microprocessor handshake layer using INT (open-drain interrupt) and KILL (0.6V threshold fault input) to coordinate graceful system shutdown. Its internal KILL timer enforces strict power-down sequencing - 512ms blanking after enable assertion and 1024ms maximum off-delay before forced release.

It integrates high-voltage tolerant inputs (PB up to 26.4V, ±10kV HBM ESD), low-leakage EN/INT outputs (±0.1µA leakage), and precise voltage monitoring capability via the KILL comparator. The device operates without external biasing for PB (internal 100kΩ pull-up to 1.9V) and supports direct connection to DC/DC converter SHDN pins with internal pull-up.

Key Specifications

Pinout & Package

Package: 8-lead plastic DFN (3mm × 2mm), exposed pad (Pin 9), RoHS-compliant, tape-and-reel (TRPBF).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC2951CDDB-1#TRPBF and LTC2953IDDB-1#TRPBF, the LTC2950IDDB-1#TRPBF delivers the lowest quiescent current (6µA vs 12µA) and simplest feature set - ideal for cost- and power-sensitive applications where only basic pushbutton sequencing and µP handshake are needed.

Availability

LTC2950IDDB-1#TRPBF is available at Aetrix Electronics and suitable for portable instrumentation meters, blade servers, and desktop/notebook computers requiring stable component supply across industrial temperature ranges and long product lifecycles.

Supply support for LTC2950IDDB-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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.

The LTC2950 product line was designed specifically for ultra-low-power, wide-input-voltage pushbutton power sequencing in battery-operated and industrial embedded systems - emphasizing reliability, ESD robustness, and minimal external components.

FAQ

What is the EN output behavior of the LTC2950IDDB-1#TRPBF?

The LTC2950IDDB-1#TRPBF features a high-true open-drain EN output (LTC2950-1 variant). It asserts high to enable external DC/DC converters after valid pushbutton press and KILL confirmation, and releases low on power-off command, KILL assertion, or timeout. It sinks ≥3mA with VOL ≤0.4V and operates within 0–10V range.

How does the KILL input function in the LTC2950IDDB-1#TRPBF?

The KILL input of the LTC2950IDDB-1#TRPBF is a 0.6V threshold comparator used for fault signaling and µP handshake. During power-on, it is blanked for 512ms; if not pulled high within that window, EN releases. During normal operation, pulling KILL low immediately releases EN. It also supports voltage monitoring when tied to a VIN divider.

Can the LTC2950IDDB-1#TRPBF operate without a microprocessor?

Yes, the LTC2950IDDB-1#TRPBF can operate without a microprocessor. The KILL pin may be tied to a fixed voltage divider or pulled low via resistor to ground (per Figure 6 in datasheet), enabling basic pushbutton ON/OFF control. INT output becomes unused, and KILL's fault-handling role is disabled, but core debounce and EN gating remain fully functional.

What is the purpose of the ONT and OFFT pins on the LTC2950IDDB-1#TRPBF?

The ONT and OFFT pins on the LTC2950IDDB-1#TRPBF allow external capacitors to extend the internal 32ms turn-on and turn-off debounce times. Placing a capacitor from ONT/OFFT to GND adds programmable delay (e.g., 1500pF adds ~11.5ms), enabling adaptation to noisy switch environments or user-defined hold-time requirements without firmware changes.

Is the LTC2950IDDB-1#TRPBF pin-compatible with other LTC2950 variants?

Yes, the LTC2950IDDB-1#TRPBF is pin-compatible with all DFN-packaged LTC2950 variants (e.g., LTC2950CDDB-1#TRPBF, LTC2950IDDB-2#TRPBF), sharing identical 8-pin DFN-8 (3mm × 2mm) layout and pin functions. Only temperature grade (I-grade = –40°C to +85°C) and EN polarity (–1 = high-true, –2 = low-true) differ between variants.