Analog Devices Inc. LTC2935IDC-3#TRPBF

Overview

LTC2935IDC-3#TRPBF from Analog Devices (formerly Linear Technology) is an ultra-low power voltage supervisor IC with open-drain reset and power-fail outputs, eight pin-selectable reset thresholds (1.60V–2.40V), ±1.5% threshold accuracy over temperature, and 500nA typical quiescent current - designed for battery-powered portable equipment requiring reliable early-warning low-voltage detection and system reset.

For engineers reviewing the LTC2935IDC-3#TRPBF datasheet, LTC2935IDC-3#TRPBF pinout, LTC2935IDC-3#TRPBF application, or LTC2935IDC-3#TRPBF equivalent, key selection criteria include its –40°C to 85°C industrial temperature grade, 2mm × 2mm DFN package, open-drain output configuration, 120mV fixed power-fail hysteresis above reset threshold, and 200ms reset timeout with 5% rising-edge hysteresis.

Technical Context

The LTC2935IDC-3#TRPBF integrates dual precision comparators with internal attenuators and a 200ms reset timer. Its reset threshold is selected via three binary inputs (S2/S1/S0), enabling eight discrete falling thresholds between 1.576V and 2.440V (typical), each paired with a corresponding power-fail threshold 120mV higher.

It operates with no external components beyond a 0.1μF VCC bypass capacitor. The MR input supports manual reset with 20μs minimum pulse width and internal 900kΩ pull-up; RST and PFO outputs are open-drain, compatible with pull-up voltages up to 5.5V independent of VCC.

Key Specifications

Pinout & Package

Package: 8-Lead (2mm × 2mm) Plastic DFN with exposed pad (pin 9, optional GND connection). Compact footprint suits space-constrained portable designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC2935ITS8-3#TRPBF, the LTC2935IDC-3#TRPBF offers superior thermal performance in high-density layouts; compared with LTC2934IDC-3#TRPBF, it eliminates external resistors and simplifies design while retaining identical low-power operation and industrial temperature support.

Availability

LTC2935IDC-3#TRPBF is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered security systems, and point-of-sale handheld terminals requiring stable component supply across extended production cycles.

Supply support for LTC2935IDC-3#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 product lines with rigorous industrial qualification standards.

The LTC2935 series was designed specifically for ultra-low-power battery supervision in portable and energy-harvesting systems, emphasizing minimal IQ, deterministic reset timing, and robust noise immunity without external timing components.

FAQ

What is the maximum supply voltage for LTC2935IDC-3#TRPBF?

The absolute maximum VCC rating for LTC2935IDC-3#TRPBF is 6V, but the recommended operating range is 1V to 5.5V. Exceeding 5.5V risks permanent damage per Absolute Maximum Ratings. This limit applies regardless of whether RST/PFO are pulled up to higher voltages - those outputs tolerate up to 6V, but VCC itself must stay ≤5.5V for safe operation.

How does the power-fail threshold relate to the reset threshold in LTC2935IDC-3#TRPBF?

In LTC2935IDC-3#TRPBF, the power-fail threshold is fixed at 120mV above whichever reset threshold is selected via S2/S1/S0. For example, with S2=S1=Low and S0=High, the reset threshold is 2.320V (typ), so PFO asserts at 2.440V (typ). This differential is guaranteed across temperature and supply voltage, enabling predictable early-warning timing before system reset.

Can LTC2935IDC-3#TRPBF operate with a 1.2V supply rail?

Yes, LTC2935IDC-3#TRPBF functions down to 1V VCC, making it suitable for 1.2V systems. At 1.2V, the lowest selectable reset threshold is 1.576V - which exceeds VCC - so only thresholds ≥1.60V are usable. In practice, this means LTC2935IDC-3#TRPBF can supervise rails ≥1.6V; for sub-1.6V rails, consider LTC2934IDC-3#TRPBF with external resistor adjustment.

What is the purpose of the exposed pad on the LTC2935IDC-3#TRPBF DFN package?

The exposed pad (pin 9) on LTC2935IDC-3#TRPBF serves primarily as a thermal and mechanical anchor. It may be left floating or soldered to PCB ground - no electrical connection is required. When grounded, it improves thermal dissipation (reducing θJA from 102°C/W to lower effective value) and enhances mechanical reliability during thermal cycling, especially in industrial environments.

Does LTC2935IDC-3#TRPBF require external capacitors for reset timing?

No, LTC2935IDC-3#TRPBF generates its 200ms reset timeout internally using a precision RC oscillator - no external capacitor or resistor is needed. This eliminates timing drift due to component tolerance or temperature, ensures consistent reset hold time across units, and reduces bill-of-materials count and PCB area versus supervisors requiring external timing networks.