Analog Devices Inc. LTC2934IDC-2

Overview

LTC2934IDC-2 from Analog Devices (formerly Linear Technology) is an ultra-low power, adjustable voltage supervisor IC with independent power-fail warning and active-pull-up reset output. It features 500nA typical quiescent current, ±1.5% threshold accuracy over temperature, 1.6V minimum supply operation, and selectable 15ms/200ms reset timeout - designed for battery-powered portable equipment requiring reliable early-warning shutdown and controlled system initialization.

For engineers reviewing the LTC2934IDC-2 datasheet, LTC2934IDC-2 pinout, LTC2934IDC-2 application, or LTC2934IDC-2 equivalent, key selection criteria include its active-pull-up RST/PFO outputs (eliminating external pull-ups), dual-threshold configurability (ADJ and PFI inputs), manual reset input with internal 900kΩ pull-up, and DFN-8 (2mm × 2mm) package with –40°C to +85°C industrial temperature rating.

Technical Context

The LTC2934IDC-2 integrates two precision comparators with independently adjustable thresholds: ADJ input sets the reset threshold (400mV nominal, ±1.5% max error), while PFI input sets the power-fail threshold (also 400mV nominal). Each comparator includes built-in hysteresis - 5% for ADJ (20mV typ) and 2.5% for PFI (10mV typ) - ensuring noise immunity during voltage transients.

Its reset logic uses an internal timer triggered when ADJ rises above threshold; RT pin selects either 15ms or 200ms timeout before RST releases high. The active-pull-up outputs (RST and PFO) drive to VCC level with VOH ≥ 0.7•VCC and VOL ≤ 100mV at 200μA sink, enabling direct interfacing with CMOS logic without external components.

Key Specifications

Pinout & Package

Package: 8-Lead (2mm × 2mm) Plastic DFN (DC package), exposed pad optional for thermal enhancement or grounding.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC2934IDC-2, LTC2935IDC-2 reduces design complexity for standard thresholds but sacrifices adjustability, while LTC2909IDC-2 expands fault coverage at the cost of higher quiescent current and added external components.

Availability

LTC2934IDC-2 is available at Aetrix Electronics and suitable for portable medical sensors, wireless point-of-sale terminals, and security system peripherals requiring stable component supply, long-term lifecycle support, and guaranteed industrial-temperature performance.

Supply support for LTC2934IDC-2 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 LTC2934 product line delivers ultra-low-power, precision voltage supervision for battery-critical applications - engineered specifically for extended runtime, accurate threshold detection, and robust operation in portable and industrial edge devices.

FAQ

What is the function of the RT pin on the LTC2934IDC-2?

The RT pin on the LTC2934IDC-2 selects the reset timeout period: tying RT to GND configures a 15ms delay, while tying RT to V_CC selects 200ms. This internal timer begins after the ADJ input rises above its 400mV threshold plus 5% hysteresis. No external capacitor or resistor is required - the selection is purely logic-level, making it ideal for simple, reliable timing control in space-constrained designs using the LTC2934IDC-2.

How does the LTC2934IDC-2 differ from the LTC2934IDC-1 variant?

The LTC2934IDC-2 features active-pull-up RST and PFO outputs that drive high to V_CC, whereas the LTC2934IDC-1 uses open-drain outputs requiring external pull-up resistors. This eliminates BOM items and simplifies layout for the LTC2934IDC-2, especially in low-voltage systems where pull-up voltage must match V_CC. Both variants share identical threshold accuracy, quiescent current, and temperature rating - the output architecture is the sole functional distinction between LTC2934IDC-2 and LTC2934IDC-1.

Can the LTC2934IDC-2 monitor two different supply rails simultaneously?

Yes - the LTC2934IDC-2 can supervise two independent voltages using separate resistive dividers on the ADJ and PFI inputs. For example, ADJ can be biased from a 3.3V rail to trigger reset at 1.6V, while PFI is biased from a 5V rail to warn at 2.7V. The datasheet Figure 2 shows dual-rail configuration with four resistors. Input leakage ≤±1nA ensures minimal interaction between dividers, preserving accuracy for both thresholds in the LTC2934IDC-2.

What is the minimum V_CC required for the LTC2934IDC-2 to assert valid RST and PFO outputs?

The LTC2934IDC-2 guarantees functional RST and PFO outputs down to V_CC = 1.6V. At this minimum supply, VOL remains ≤100mV with 200μA sink current, and VOH reaches ≥0.7•V_CC (≥1.12V) with 200μA source current. This enables reliable interfacing with 1.8V logic families even as the battery discharges - a critical capability confirmed in the Electrical Characteristics table and validated across the –40°C to +85°C range for the LTC2934IDC-2.

Is the exposed pad on the LTC2934IDC-2's DFN package required to be connected to ground?

No - the exposed pad on the LTC2934IDC-2's DFN package is optional per the datasheet: it may be left floating or connected to PCB ground. When grounded, it improves thermal dissipation (θ_JA = 102°C/W) and provides additional ESD current path; when unconnected, thermal performance degrades slightly but remains within specification. Neither configuration affects electrical functionality, and the pad is not electrically tied to any internal node - its use is strictly a mechanical/thermal design choice for the LTC2934IDC-2.