Analog Devices Inc. LTC2935IDC-4#TRPBF

Overview

LTC2935IDC-4#TRPBF from Analog Devices (formerly Linear Technology) is an ultra-low power voltage supervisor IC with active-pull-up 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-4#TRPBF datasheet, LTC2935IDC-4#TRPBF pinout, LTC2935IDC-4#TRPBF application, or LTC2935IDC-4#TRPBF equivalent, key selection considerations include its active-pull-up RST/PFO outputs, –40°C to 85°C industrial temperature range, 2mm × 2mm DFN package, and precise 120mV fixed offset between power-fail and reset thresholds.

Technical Context

The LTC2935IDC-4#TRPBF integrates dual comparators with independent hysteresis (5% on RST, 2.5% on PFO), a 200ms internal reset timeout timer, and logic-level threshold selection via S2/S1/S0 inputs. Its active-pull-up output architecture eliminates external pull-up resistors and ensures valid RST/PFO states down to VCC = 0V when paired with a 100kΩ ground tie.

It operates across VCC = 1V to 5.5V, draws only 500nA at 3.6V, and maintains ±1.5% reset threshold accuracy from –40°C to 85°C. The power-fail threshold is fixed 120mV above the selected reset threshold, enabling deterministic early-warning timing for controlled shutdown sequences in energy-constrained systems.

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 LTC2935IDC-2#TRPBF, LTC2935IDC-4#TRPBF provides lower reset thresholds suited for coin cell and single-alkaline systems; versus LTC2934IDC-4#TRPBF, it eliminates external resistors and guarantees 8 discrete, production-tested thresholds with ±1.5% accuracy.

Availability

LTC2935IDC-4#TRPBF is available at Aetrix Electronics and suitable for battery-powered portable equipment, wireless sensor nodes, point-of-sale terminals, and security system peripherals requiring stable component supply across extended product lifecycles.

Supply support for LTC2935IDC-4#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 high-reliability analog IC portfolio, emphasizing precision, low power, and robust performance in harsh environments.

The LTC2935 family was designed specifically for ultra-low-power battery supervision in portable and energy-harvesting systems, delivering guaranteed accuracy, minimal IQ, and deterministic power-fail timing without external components.

FAQ

What is the exact reset threshold range supported by LTC2935IDC-4#TRPBF?

The LTC2935IDC-4#TRPBF supports eight discrete reset thresholds ranging from 1.60V to 2.40V in 150mV increments (1.60V, 1.72V, 1.84V, 1.96V, 2.08V, 2.20V, 2.32V, 2.40V), selected via S2/S1/S0 logic levels. Each threshold has a corresponding power-fail threshold 120mV higher, and all values are specified with ±1.5% accuracy over –40°C to 85°C.

Does LTC2935IDC-4#TRPBF require external pull-up resistors on RST and PFO?

No - LTC2935IDC-4#TRPBF features active-pull-up outputs that drive RST and PFO high to VCC internally, eliminating the need for external pull-up resistors. For interfacing with high-impedance CMOS inputs, a 100kΩ resistor from RST or PFO to GND is recommended to prevent floating states during VCC = 0V conditions.

How does the manual reset (MR) function behave on LTC2935IDC-4#TRPBF?

When MR is pulled low (e.g., via pushbutton to GND), LTC2935IDC-4#TRPBF forces RST low immediately. After MR returns high, RST remains low for a guaranteed 200ms (140–260ms) before releasing - identical to the power-on reset timeout. MR is internally pulled up to VCC via a 900kΩ resistor, so no external pull-up is required unless leakage currents interfere.

Can LTC2935IDC-4#TRPBF monitor supplies below 1V?

No - LTC2935IDC-4#TRPBF requires VCC ≥ 1V to operate and assert valid outputs. Its lowest supported reset threshold is 1.60V, and the device itself ceases functional operation below 1V. For sub-1V monitoring, alternative solutions such as discrete comparator-based supervisors would be required.

What is the purpose of the exposed pad on the LTC2935IDC-4#TRPBF DFN package?

The exposed pad (pin 9) on the LTC2935IDC-4#TRPBF DFN package is optional for grounding and serves primarily as a thermal relief path. It may be left floating or soldered to the PCB ground plane to improve thermal dissipation and reduce θJA (102°C/W typical). No electrical functionality depends on this connection.