Analog Devices Inc. LTC2934IDC-1

Overview

LTC2934IDC-1 from Analog Devices (formerly Linear Technology) is an ultra-low power, adjustable voltage supervisor IC designed for system initialization, power-fail warning, and reset generation in battery-constrained applications. It features 500nA typical quiescent current, ±1.5% threshold accuracy over temperature, 1.6V minimum operating supply, independently configurable 400mV ADJ/PFI thresholds, and selectable 15ms/200ms reset timeout - used in portable medical monitors, coin-cell–powered security sensors, and low-power wireless transceivers.

For engineers reviewing the LTC2934IDC-1 datasheet, LTC2934IDC-1 pinout, LTC2934IDC-1 application, or LTC2934IDC-1 equivalent, key selection criteria include its open-drain PFO/RST outputs (LTC2934-1 variant), –40°C to 85°C industrial temperature grade, 2mm × 2mm DFN package with exposed pad, and precise 0.4V internal comparator reference enabling accurate external resistor-divider threshold setting.

Technical Context

The LTC2934IDC-1 integrates two independent comparators: one monitoring the ADJ input for reset assertion at 400mV ±6mV, and another monitoring PFI for early power-fail detection at the same 400mV threshold. Each comparator includes dedicated hysteresis (20mV for ADJ, 10mV for PFI) and glitch immunity against transients ≤2ms wide.

Its RT pin selects between two factory-trimmed reset timeout periods (15ms or 200ms) after threshold recovery, while MR provides manual reset with 20μs minimum pulse width and internal 900kΩ pull-up. The device operates down to 1.6V VCC and draws only 225–1000nA across its full temperature range.

Key Specifications

Pinout & Package

Package: 8-Lead (2mm × 2mm) Plastic DFN (DC package) with optional exposed pad connected to GND; RoHS-compliant, lead-free finish; rated for –40°C to 85°C ambient operation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage supervisor applications.

Compared with LTC2935IDC-1 and TPS3808G18DBVR, the LTC2934IDC-1 uniquely delivers both ultra-low IQ and fully programmable dual-threshold supervision in an industrial-grade DFN, making it the only option supporting early-warning shutdown sequencing in battery-critical systems.

Availability

LTC2934IDC-1 is available at Aetrix Electronics and suitable for portable medical monitors, battery-powered security sensors, and low-power wireless transceivers requiring stable component supply across extended product lifecycles.

Supply support for LTC2934IDC-1 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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets.

The LTC2934IDC-1 belongs to ADI's precision power supervision product line, engineered specifically for ultra-low-power, battery-operated systems demanding accurate, dual-threshold voltage monitoring with minimal quiescent current.

FAQ

What is the function of the RT pin on the LTC2934IDC-1?

The RT pin on the LTC2934IDC-1 selects the reset timeout period: tying RT to GND configures a 15ms delay, while tying RT to VCC selects a 200ms delay. This timeout begins after the ADJ input rises above its 400mV threshold plus 5% hysteresis, and determines how long RST remains low before releasing. No external components are needed - the timing is factory-trimmed and temperature-compensated within the LTC2934IDC-1 die.

Can the LTC2934IDC-1 monitor two different supply rails simultaneously?

Yes, the LTC2934IDC-1 can monitor two independent supply rails using separate resistor dividers on the ADJ and PFI inputs. Each input references the same internal 400mV comparator, allowing distinct falling thresholds (e.g., 3.19V on PFI for early warning and 2.55V on ADJ for final reset). The LTC2934IDC-1 datasheet provides design equations and example circuits for dual-rail configuration without additional ICs.

What is the maximum allowable input voltage on the ADJ and PFI pins of the LTC2934IDC-1?

The absolute maximum rating for ADJ and PFI inputs on the LTC2934IDC-1 is –0.3V to 6V, independent of VCC. However, for reliable comparator operation, the monitored voltage must be scaled via external resistive dividers to stay within the 0.4V threshold window. Input leakage is limited to ±1nA, enabling high-impedance dividers that minimize loading on sensitive battery rails.

How does the manual reset (MR) feature work on the LTC2934IDC-1?

The MR pin on the LTC2934IDC-1 is an active-low input with an internal 900kΩ pull-up to VCC. Pulling MR below 0.4V (for VCC ≥ 1V) forces RST low immediately. After MR returns high, RST remains low for the full selected reset timeout period (15ms or 200ms) before releasing. A 20μs minimum pulse width ensures robust noise immunity, and no external pull-up is required unless leakage currents threaten logic integrity.

Is the exposed pad on the LTC2934IDC-1's DFN package required to be connected to ground?

No, the exposed pad (Pin 9) on the LTC2934IDC-1's 2mm × 2mm DFN package is optional for grounding. It may be left floating or soldered to the PCB ground plane based on thermal requirements. When connected, it improves thermal dissipation (θJA reduced from 102°C/W to lower effective value), but electrical functionality of the LTC2934IDC-1 is fully maintained regardless of the pad's connection state.