Analog Devices Inc. LTC2950CDDB-2#TRMPBF

Overview

LTC2950CDDB-2#TRMPBF from Analog Devices (formerly Linear Technology) is a micropower pushbutton ON/OFF controller with low-true enable output, operating from 2.7V to 26.4V supply, consuming only 6µA typical quiescent current, featuring independently programmable ON/OFF debounce (32ms default), internal KILL timer for fault-safe power-down, and 8-pin 3mm × 2mm DFN package. It serves as system-level power sequencing supervisor in battery-powered portable instrumentation.

For engineers reviewing the LTC2950CDDB-2#TRMPBF datasheet, LTC2950CDDB-2#TRMPBF pinout, LTC2950CDDB-2#TRMPBF application, or LTC2950CDDB-2#TRMPBF equivalent, key selection criteria include EN polarity (low-true), KILL input threshold (0.6V), INT interrupt timing (1024ms off-delay), PB ESD rating (±10kV HBM), and compatibility with external ONT/OFFT capacitors for adjustable debounce.

Technical Context

The LTC2950CDDB-2#TRMPBF implements a dual-stage power control architecture: first, a robust pushbutton interface with internal 32ms debounce plus externally adjustable timing via ONT/OFFT pins; second, a microprocessor handshake layer using open-drain INT and KILL signals to coordinate graceful shutdown. Its EN output is active-low, enabling direct connection to circuit breaker control inputs.

It integrates a 0.6V accurate KILL comparator with 30mV hysteresis, a 512ms KILL turn-on blanking timer, and a fixed 1024ms KILL turn-off delay - all designed to ensure deterministic power-up sequencing and controlled power-down before DC/DC converter disable. The PB pin supports –6V to 26.4V operation with ±10kV HBM ESD protection.

Key Specifications

Pinout & Package

Package: 8-lead 3mm × 2mm plastic DFN (DDB8), exposed pad (Pin 9) optional GND connection. RoHS-compliant, lead-free finish, tape-and-reel (500 pcs).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC2950CDDB-1#TRMPBF, the LTC2950CDDB-2#TRMPBF provides inverted EN polarity essential for circuit breaker control, while LTC2953CDDB#TRMPBF adds voltage supervision but increases complexity and cost - making LTC2950CDDB-2#TRMPBF optimal for pure pushbutton-driven power gating with low-side switching.

Availability

LTC2950CDDB-2#TRMPBF is available at Aetrix Electronics and suitable for portable instrumentation meters, blade servers, and desktop/notebook auxiliary power management requiring stable component supply, long-life battery operation, and robust ESD immunity.

Supply support for LTC2950CDDB-2#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.

The LTC2950 product line delivers micropower pushbutton ON/OFF controllers optimized for battery-powered and industrial systems requiring deterministic, fault-tolerant power sequencing with minimal external components.

FAQ

What is the EN output polarity of the LTC2950CDDB-2#TRMPBF?

The LTC2950CDDB-2#TRMPBF features a low-true open-drain EN output. When a valid pushbutton press is detected and KILL remains high, EN is actively pulled low to enable downstream circuit breaker control. This distinguishes it from the LTC2950-1 variant, which asserts EN high. The 0.11V max VOL at 3mA ensures reliable logic-low recognition across voltage domains.

How does the KILL input function in the LTC2950CDDB-2#TRMPBF?

In the LTC2950CDDB-2#TRMPBF, the KILL input is a comparator with a precise 0.6V threshold. Pulling KILL below 0.6V releases the EN output immediately, terminating system power. During power-up, KILL is blanked for 512ms to allow DC/DC and µP stabilization. If KILL remains low after blanking, EN is released - enabling both fault shutdown and battery voltage monitoring.

Can the LTC2950CDDB-2#TRMPBF operate from a 3.3V supply?

Yes, the LTC2950CDDB-2#TRMPBF operates over a 2.7V to 26.4V input range, fully supporting 3.3V nominal supplies. At 3.3V, its 6µA typical quiescent current remains unchanged, and all timing parameters (e.g., 32ms default debounce, 512ms KILL blanking) retain specification. The PB pin tolerates up to 26.4V, allowing mixed-voltage interface with higher-voltage buttons.

What is the purpose of the ONT and OFFT pins on the LTC2950CDDB-2#TRMPBF?

The ONT and OFFT pins on the LTC2950CDDB-2#TRMPBF allow external capacitor-based extension of the internal 32ms debounce timers. Connecting a capacitor from ONT to GND adds adjustable turn-on time (tONT); connecting one from OFFT to GND adds adjustable turn-off time (tOFFT). Floating either pin reverts to the default 32ms value. This eliminates firmware debounce and supports mechanical switch variability.

Is the LTC2950CDDB-2#TRMPBF compatible with the TSOT-23 package?

No, the LTC2950CDDB-2#TRMPBF is exclusively offered in the 8-lead 3mm × 2mm plastic DFN (DDB8) package. The TSOT-23 variant is designated separately (e.g., LTC2950CTS8-2#TRMPBF). While both share identical electrical specifications and pin functions, the DFN package offers lower thermal resistance (θJA = 165°C/W) and an exposed pad for enhanced heat dissipation - critical in compact portable designs.