Analog Devices Inc. LTC2935IDC-3#TRMPBF

Overview

LTC2935IDC-3#TRMPBF 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 systems requiring early low-voltage warning and reliable system initialization.

For engineers reviewing the LTC2935IDC-3#TRMPBF datasheet, LTC2935IDC-3#TRMPBF pinout, LTC2935IDC-3#TRMPBF application, or LTC2935IDC-3#TRMPBF equivalent, key selection considerations include its –40°C to 85°C industrial temperature grade, 2mm × 2mm DFN package, open-drain output configuration, 200ms reset timeout, and precise 120mV power-fail margin above each selected reset threshold.

Technical Context

The LTC2935IDC-3#TRMPBF integrates two independent comparators: one for reset generation (VRTF) and one for power-fail warning (VPFT), with VPFT fixed at +120mV above VRTF. Its internal precision attenuators and binary-coded S2/S1/S0 inputs configure eight discrete falling thresholds without external resistors.

It features 5% hysteresis on the reset comparator and 2.5% on the power-fail comparator to prevent chatter during supply transients; the RST output remains low for 200ms after VCC exceeds the hysteresis band, ensuring stable processor initialization. MR input supports manual reset with 20μs minimum pulse width and internal 900kΩ pull-up.

Key Specifications

Pinout & Package

Package: 8-Lead (2mm × 2mm) Plastic DFN with exposed pad (pin 9, optional GND connection). RoHS-compliant, lead-free finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC2935IDC-1#TRMPBF, LTC2935IDC-3#TRMPBF delivers lower-voltage supervision essential for modern ultra-low-power SoCs, while versus LTC2934ITS8-3#TRMPBF it eliminates resistor matching errors and reduces BOM count - making it the preferred choice for production-critical, space-constrained battery systems.

Availability

LTC2935IDC-3#TRMPBF is available at Aetrix Electronics and suitable for battery-powered portable equipment, industrial wireless sensor nodes, point-of-sale terminal backup power, and security system keypad applications requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance.

Supply support for LTC2935IDC-3#TRMPBF 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 high-reliability analog IC portfolio, emphasizing precision, low power, and robustness for mission-critical systems.

The LTC2935 family was designed specifically for ultra-low-power battery supervision in portable and energy-harvesting applications, prioritizing nanoscale quiescent current, pin-configurable thresholds, and fail-safe reset timing without external components.

FAQ

What is the exact reset threshold range supported by LTC2935IDC-3#TRMPBF?

The LTC2935IDC-3#TRMPBF supports eight discrete falling reset thresholds: 2.44V, 2.32V, 2.20V, 2.08V, 1.96V, 1.84V, 1.72V, and 1.60V - selected via S2/S1/S0 logic levels. Each threshold has ±1.5% max accuracy over –40°C to 85°C, and the corresponding power-fail threshold is fixed at +120mV above the selected reset value.

Does LTC2935IDC-3#TRMPBF require external pull-up resistors on RST and PFO?

Yes, LTC2935IDC-3#TRMPBF features open-drain RST and PFO outputs and requires external pull-up resistors. Recommended values range from 10kΩ to 470kΩ; a 100kΩ resistor is typical for 3.3V systems. The pull-up voltage may exceed VCC (up to 5.5V), enabling level translation to higher-voltage logic domains.

How does the manual reset (MR) function behave on LTC2935IDC-3#TRMPBF?

When MR is pulled low (≥20μs pulse), LTC2935IDC-3#TRMPBF forces RST low immediately. After MR returns high, RST remains low for a full 200ms timeout - identical to the power-on reset delay - ensuring consistent reset duration regardless of trigger source. MR has an internal 900kΩ pull-up to VCC.

Can LTC2935IDC-3#TRMPBF monitor supplies below 1.6V?

No. The lowest factory-configured reset threshold for LTC2935IDC-3#TRMPBF is 1.60V (S2=S1=S0=High). It cannot supervise sub-1.6V rails such as 1.2V FPGA cores or 1.0V ASIC domains. For those, consider the LTC2915/LTC2916 family with 27-pin-selectable thresholds down to 0.4V.

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

LTC2935IDC-3#TRMPBF has an absolute maximum VCC rating of 6V, but its specified operating range is 1V to 5.5V. Operation above 5.5V risks permanent damage. All inputs (S2/S1/S0/MR) tolerate up to (VCC + 0.3V), and open-drain outputs (RST/PFO) withstand up to 6V regardless of VCC level.