Analog Devices Inc. LTC2956IUD-2#TRPBF

Overview

LTC2956IUD-2#TRPBF from Analog Devices (formerly Linear Technology) is a micropower, wide-input wake-up timer IC with pushbutton control and active-low enable output. It operates from 1.5V to 36V, delivers 0.8µA quiescent current in awake state and 0.3µA in shutdown, and supports configurable wake-up periods from 250ms to 39 days-enabling periodic sensor monitoring in battery-powered remote telemetry systems.

For engineers reviewing the LTC2956IUD-2#TRPBF datasheet, LTC2956IUD-2#TRPBF pinout, LTC2956IUD-2#TRPBF application, or LTC2956IUD-2#TRPBF equivalent, key selection criteria include its active-low EN output driving external P-channel MOSFETs, ±25kV HBM ESD tolerance on PB input, 12-lead 3mm × 3mm QFN package, and support for long-press shutdown via SLEEP or PB inputs.

Technical Context

The LTC2956IUD-2#TRPBF implements a dual-mode state machine (RUN and SHUTDOWN) with digital timing counters for tPERIOD and analog-digital hybrid timing for tONMAX. Its internal 2kHz oscillator feeds a programmable divider (÷1 to ÷2²²) to set wake intervals, while ONMAX capacitor-based timing provides adjustable maximum awake duration up to 72ms.

It features three open-drain status outputs (ONALERT, OFFALERT, PBOUT), debounced PB input with 32ms typical debounce time, and voltage-controlled mode transitions: SLEEP high > tLONG forces SHUTDOWN; PB low > tLONG initiates controlled power-down with 1s OFFALERT assertion before EN deactivation.

Key Specifications

Pinout & Package

Package: 12-lead 3mm × 3mm plastic QFN (UD package), exposed pad (Pin 13) connected to GND. RoHS-compliant, lead-free finish.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar wake-up timer applications.

Compared with TPS3897A33DBVR and MAX16050ETA+, the LTC2956IUD-2#TRPBF uniquely integrates adjustable timing, hardware debouncing, dual-mode alerts, and VIN-referenced EN drive - making it the only solution that eliminates external components while supporting both battery longevity and deterministic power sequencing across industrial voltage ranges.

Availability

LTC2956IUD-2#TRPBF is available at Aetrix Electronics and suitable for remote sensor nodes, industrial data loggers, portable medical devices, and smart utility meters requiring stable component supply across extended temperature and voltage ranges.

Supply support for LTC2956IUD-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 LTC2956IUD-2#TRPBF belongs to Linear's precision power management timer family, designed specifically for ultra-low-power, long-duration, event-triggered system wake-up in resource-constrained embedded applications.

FAQ

What is the function of the EN pin on the LTC2956IUD-2#TRPBF?

The EN pin on the LTC2956IUD-2#TRPBF is an active-low, VIN-referenced enable output. During the awake state, it pulls to GND to turn on the system; during sleep, it pulls to VIN to disable power. This direct-drive capability eliminates external level shifters when controlling P-channel MOSFETs - a core design advantage of the LTC2956IUD-2#TRPBF over competing timers.

How does the LTC2956IUD-2#TRPBF achieve 0.3µA shutdown current?

The LTC2956IUD-2#TRPBF achieves 0.3µA shutdown current by disabling internal oscillators, disconnecting bias networks from RANGE/LONG/PERIOD pins, and placing all outputs in high-impedance or defined states. This ultra-low leakage is verified across –40°C to +85°C and forms the basis for multi-year battery life in the LTC2956IUD-2#TRPBF's target applications.

Can the LTC2956IUD-2#TRPBF wake up a system based solely on time, without a microcontroller?

Yes - the LTC2956IUD-2#TRPBF operates autonomously using only external resistors (PERIOD, RANGE, LONG) and capacitor (ONMAX). It requires no host processor to initiate wake cycles, making it ideal for passive systems like intervalometers or standalone data acquisition nodes where the LTC2956IUD-2#TRPBF fully manages power sequencing.

What is the purpose of the OFFALERT pin on the LTC2956IUD-2#TRPBF?

The OFFALERT pin on the LTC2956IUD-2#TRPBF is an open-drain output pulled low for exactly 1 second (tOFF) during transition from RUN to SHUTDOWN mode. It provides a hardware-asserted warning to the host system - allowing time-critical tasks like EEPROM writes or safe MCU shutdown before EN deactivation, ensuring data integrity in the LTC2956IUD-2#TRPBF's power control sequence.

How is the wake-up period adjusted on the LTC2956IUD-2#TRPBF?

The wake-up period on the LTC2956IUD-2#TRPBF is adjusted using two external components: a resistor from PERIOD to GND sets the base timing interval (237–263ms at 100kΩ), and a resistor divider between RANGE and LONG selects the scaling factor (×1 to ×2²²), enabling total range from 250ms to 39 days - all without firmware or configuration registers.