Analog Devices Inc. LTC2956IMS-1#PBF

Overview

LTC2956IMS-1#PBF from Analog Devices (formerly Linear Technology) is a micropower, wide-input wake-up timer IC with pushbutton control and active-high enable output. It operates from 1.5V to 36V, delivers 0.8µA quiescent current in awake state and 0.3µA in shutdown, and configures wake-up periods from 250ms to 39 days via external resistors - enabling periodic power cycling for battery-powered data acquisition nodes.

For engineers reviewing the LTC2956IMS-1#PBF datasheet, LTC2956IMS-1#PBF pinout, LTC2956IMS-1#PBF application, or LTC2956IMS-1#PBF equivalent, key selection criteria include its MSOP-12 package, –40°C to +85°C industrial temperature grade, LTC2956-1 polarity (EN active high), adjustable ONMAX capacitor timing, and ±25kV HBM ESD robustness on PB input.

Technical Context

The LTC2956IMS-1#PBF implements a dual-stage timing architecture: a digital programmable divider (÷1 to ÷2²²) driven by a 1kHz oscillator sets the wake-up period (tPERIOD), while an analog ramp-based tONMAX timer-controlled by a capacitor on ONMAX-governs maximum awake duration. Configuration resistors at PERIOD, RANGE, and LONG pins define timing ranges without continuous bias current.

Its state machine supports three operational modes: Awake (EN high, system powered), Sleep (EN low, timers running), and SHUTDOWN (EN low, 0.3µA IQ, disabled timers). Mode transitions are triggered by tPERIOD expiry, debounced PB press, SLEEP edge, or long-duration SLEEP/PB events exceeding tLONG (128ms–16.4s), with ONALERT/OFFALERT open-drain outputs signaling boot/shutdown sequences.

Key Specifications

Pinout & Package

12-Lead Plastic MSOP package (3.0mm × 4.0mm, 0.65mm pitch), thermally enhanced with exposed pad connected to GND. Pin 1 marked via dot; pin numbering follows standard MSOP convention (counterclockwise from top-left corner).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPL5010IPW and MAX16054ETA+, the LTC2956IMS-1#PBF uniquely combines ultra-wide input voltage, capacitor-programmable awake time, and dual-alert outputs - making it the only option that satisfies simultaneous requirements for industrial battery longevity, hardware safety timeouts, and deterministic power sequencing.

Availability

LTC2956IMS-1#PBF is available at Aetrix Electronics and suitable for environmental monitoring, remote asset tracking, and portable medical instrumentation requiring stable component supply across extended temperature and voltage ranges.

Supply support for LTC2956IMS-1#PBF 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 LTC2956 series was designed specifically for ultra-low-power, wide-input wake-up control in battery-critical applications - emphasizing hardware-configurable timing, robust pushbutton interfacing, and fail-safe power sequencing without MCU involvement.

FAQ

What is the operating temperature range for the LTC2956IMS-1#PBF?

The LTC2956IMS-1#PBF is rated for –40°C to +85°C operation, matching the industrial temperature grade specified for the IMS (MSOP) package variant. This range is validated across all electrical parameters including quiescent current, wake-up period accuracy, and EN output drive strength - ensuring reliable performance in harsh environments such as factory automation or outdoor telemetry enclosures.

How does the LTC2956IMS-1#PBF differ from the LTC2956IMS-2#PBF?

The LTC2956IMS-1#PBF features an active-high EN output optimized for driving RUN/SHDN inputs of DC/DC converters, while the LTC2956IMS-2#PBF provides an active-low EN output capable of directly controlling P-channel MOSFET gates. Both share identical timing, packaging, and temperature specifications - the choice depends solely on system-level power architecture requirements.

Can the LTC2956IMS-1#PBF operate from a single 1.5V alkaline cell?

Yes, the LTC2956IMS-1#PBF functions down to 1.5V supply voltage with guaranteed timing accuracy and 0.8µA quiescent current. Its 1.24V undervoltage lockout (with 100mV hysteresis) ensures clean startup and shutdown as the cell discharges - making it suitable for long-life applications powered by AA/AAA batteries without boost regulation.

What is the purpose of the ONALERT and OFFALERT pins on the LTC2956IMS-1#PBF?

The ONALERT pin pulls low during the first Awake state after power-up or exit from SHUTDOWN mode, signaling the host MCU to execute initialization routines. The OFFALERT pin pulls low for 1 second during transition into SHUTDOWN mode, providing advance warning for graceful system shutdown - both are open-drain outputs requiring external pull-ups.

How is the wake-up period configured on the LTC2956IMS-1#PBF?

The wake-up period is set using two external resistors: one from PERIOD to GND (32.4kΩ–324kΩ) establishes base timing, and another from RANGE to GND (with 100kΩ tie to LONG) selects scaling factor (×1, ×4, or ×16). This resistor network defines periods from 250ms to 39 days without firmware or crystal dependencies - configuration occurs automatically every 66 seconds during RUN mode.