Analog Devices Inc. LTC2956IMS-1#TRPBF

Overview

LTC2956IMS-1#TRPBF from Analog Devices (formerly Linear Technology) is a micropower, wide-input wake-up timer IC with pushbutton control and active-high enable output, operating from 1.5V to 36V supply, featuring 250ms–39-day configurable wake period, 800nA quiescent current in awake state, and –40°C to +85°C industrial temperature range. It enables periodic system activation for battery-powered data acquisition or intervalometer tasks.

For engineers reviewing the LTC2956IMS-1#TRPBF datasheet, LTC2956IMS-1#TRPBF pinout, LTC2956IMS-1#TRPBF application, or LTC2956IMS-1#TRPBF equivalent, key selection criteria include EN polarity compatibility, ONMAX capacitor-based awake-time tuning, SLEEP input behavior in active vs passive systems, and MSOP-12 thermal performance (θ_JA = 135°C/W).

Technical Context

The LTC2956IMS-1#TRPBF implements a dual-stage timing architecture: a digital programmable divider (÷1 to ÷2²²) driven by a 1kHz oscillator sets the wake period (t_PERIOD), while an analog ramp on the ONMAX pin-combined with internal digital counting-controls maximum awake time (t_ONMAX). Configuration resistors at PERIOD, RANGE, and LONG pins define timing ranges without continuous bias current.

Its state machine transitions between AWAKE (EN high), SLEEP (EN low), and SHUTDOWN (0.3µA I_IN) modes, with t_{SLEEP_MIN} = 128ms and t_{AWAKE_MIN} = 8ms enforced to ensure system stability and supply discharge. The PB input includes 32ms debounce (t_DB), and status outputs (ONALERT, OFFALERT, PBOUT) provide open-drain event signaling.

Key Specifications

Pinout & Package

12-Lead Plastic MSOP package (3mm × 4.9mm), exposed pad not connected (no thermal pad), θ_JA = 135°C/W. Pin 1 marked with dot; pin numbering follows standard MSOP convention.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3897A33DBVR and MAX16054ETA+, the LTC2956IMS-1#TRPBF uniquely delivers sub-µA quiescent operation across 1.5V–36V, fully configurable timing via passive components, and dedicated status outputs for coordinated system power management-making it irreplaceable in long-life, field-deployed monitoring systems.

Availability

LTC2956IMS-1#TRPBF is available at Aetrix Electronics and suitable for remote environmental sensing, industrial data logging, and portable medical monitoring requiring stable component supply across extended temperature and voltage ranges.

Supply support for LTC2956IMS-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 acquired Linear Technology in 2017 and maintains its precision analog and power management product lines with rigorous industrial qualification standards.

The LTC2956IMS-1#TRPBF belongs to Linear's micropower supervisory and power-control IC family, designed specifically for extending battery life in infrequently powered systems through deterministic, resistor-configurable wake scheduling.

FAQ

What is the EN output configuration of the LTC2956IMS-1#TRPBF?

The LTC2956IMS-1#TRPBF features an active-high EN output (LTC2956-1 variant) that pulls high via an internal 900kΩ resistor to a 3.3V regulated supply during the awake state, and pulls low during sleep or shutdown. This allows direct connection to the RUN or ENABLE pin of most DC/DC converters without external level-shifting or pull-up components. The EN pin remains functional across the full 1.5V–36V VIN range and is rated to withstand up to 40V.

How does the LTC2956IMS-1#TRPBF achieve its 0.8µA quiescent current?

The LTC2956IMS-1#TRPBF achieves 0.8µA quiescent current by biasing configuration pins (PERIOD, RANGE, LONG) only during brief 66-second configuration cycles, using a low-frequency 1kHz oscillator for timing, and employing rail-to-rail CMOS design with minimized leakage paths. In shutdown mode, current drops further to 0.3µA by disabling internal regulators and oscillators. All specifications are guaranteed over the full –40°C to +85°C operating range.

Can the LTC2956IMS-1#TRPBF be used with a microcontroller that toggles the SLEEP pin?

Yes-the LTC2956IMS-1#TRPBF supports active-system operation where an MCU toggles the SLEEP pin to terminate the awake state immediately after task completion. A falling edge on SLEEP during awake state pulls EN low, entering sleep mode. The device enforces t_{AWAKE_MIN} = 8ms to ensure system stabilization, ignoring SLEEP transitions during this window. This enables precise, software-controlled awake durations shorter than the ONMAX capacitor limit.

What is the role of the ONMAX pin on the LTC2956IMS-1#TRPBF?

The ONMAX pin on the LTC2956IMS-1#TRPBF sets the maximum allowed awake time (t_ONMAX) by connecting a capacitor to GND, with scaling of 13.3ms/nF. When the t_ONMAX timer expires, the device forces transition to sleep mode regardless of SLEEP pin state. If left floating, t_ONMAX defaults to 8ms; tying to GND disables the timer. This provides a hardware-enforced watchdog for battery protection in case of MCU lockup.

Does the LTC2956IMS-1#TRPBF support automatic power-up into RUN mode?

Yes-the LTC2956IMS-1#TRPBF can be configured to power up in RUN mode by setting the voltage at the LONG pin above V_CC/2 using an external resistor divider. When powered, it enters the awake state immediately and asserts EN high, triggering system boot. If the LONG pin voltage is below V_CC/2, it starts in SHUTDOWN mode (0.3µA I_IN) and requires a PB press to begin operation-ideal for shipped products with installed batteries.