Analog Devices Inc. LTC2935CDC-1#TRMPBF

Overview

LTC2935CDC-1#TRMPBF from Analog Devices (formerly Linear Technology) is an ultra-low power voltage supervisor IC used for system initialization, power-fail warning, and reset generation in battery-powered systems. It features 500nA typical quiescent current, ±1.5% threshold accuracy over temperature, eight pin-selectable reset thresholds (e.g., 2.40V to 3.30V), and open-drain RST/PFO outputs. It operates from –40°C to 85°C and is deployed in portable medical monitors requiring reliable low-voltage supervision.

For engineers reviewing the LTC2935CDC-1#TRMPBF datasheet, LTC2935CDC-1#TRMPBF pinout, LTC2935CDC-1#TRMPBF application, or LTC2935CDC-1#TRMPBF equivalent, key selection criteria include its 200ms reset timeout, 120mV power-fail margin above reset threshold, 8-lead 2mm × 2mm DFN package with exposed pad, and compatibility with coin-cell and Li-ion battery monitoring circuits.

Technical Context

The LTC2935CDC-1#TRMPBF integrates dual comparators-one for reset (VRTF) and one for early power-fail warning (VPFT)-with independent hysteresis (5% for RST, 2.5% for PFO). Its S2/S1/S0 inputs configure threshold pairs via binary encoding, enabling precise matching to system supply rails without external resistors.

It uses internal precision attenuators and reference circuitry to maintain ±1.5% threshold accuracy across –40°C to 85°C. The open-drain RST and PFO outputs support flexible pull-up voltages up to 5.5V, decoupled from VCC, making it suitable for mixed-voltage domains where logic levels differ from monitored supply.

Key Specifications

Pinout & Package

Package: 8-lead, 2mm × 2mm plastic DFN (DC package) with exposed thermal 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 LTC2935ITS8-1#TRMPBF, the LTC2935CDC-1#TRMPBF offers superior thermal performance and identical functionality in a smaller footprint; versus LTC2934CDC-1#TRMPBF, it delivers factory-trimmed accuracy without external components-reducing test time and field failure risk.

Availability

LTC2935CDC-1#TRMPBF is available at Aetrix Electronics and suitable for portable medical monitors, alkaline-powered point-of-sale terminals, and coin-cell IoT sensors requiring stable component supply across multi-year production cycles.

Supply support for LTC2935CDC-1#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 full product support, documentation, and long-term manufacturing commitment for legacy Linear parts.

The LTC2935 family was designed specifically for ultra-low-power battery supervision in portable and energy-harvesting systems, emphasizing sub-1μA operation, high accuracy without calibration, and minimal external components.

FAQ

What is the operating temperature range for the LTC2935CDC-1#TRMPBF?

The LTC2935CDC-1#TRMPBF is rated for 0°C to 70°C ambient operation, as indicated by the "C" grade suffix in its part number. This distinguishes it from the "I" grade (–40°C to 85°C) variants like LTC2935IDC-1#TRMPBF. All electrical specifications-including threshold accuracy, quiescent current, and reset timeout-are guaranteed across this commercial temperature range.

How does the power-fail output (PFO) behave relative to the reset output (RST) in the LTC2935CDC-1#TRMPBF?

In the LTC2935CDC-1#TRMPBF, the PFO asserts low when VCC falls below a threshold that is fixed at 150mV above the selected reset threshold (e.g., 3.15V PFO when RST = 3.00V). PFO releases when VCC rises to VPFT + 2.5% hysteresis, while RST releases only after VCC exceeds VRTF + 5% and the 200ms timer expires. This staggered behavior provides deterministic early warning before system reset.

Can the LTC2935CDC-1#TRMPBF be used with a monitored supply below 1.8V?

Yes-the LTC2935CDC-1#TRMPBF supports VCC down to 1V, and its lowest pin-selectable reset threshold is 2.25V. While the device itself operates reliably at 1V, the 2.25V minimum threshold means it is not suitable for supervising supplies below that value. For sub-2.25V rails (e.g., 1.8V logic), use the LTC2935-3/-4 variants whose thresholds start at 1.60V.

Is the exposed pad on the LTC2935CDC-1#TRMPBF's DFN package required to be connected to ground?

No-the exposed pad (pin 9) on the LTC2935CDC-1#TRMPBF is optional for grounding. It may be left floating or connected to PCB ground to improve thermal dissipation. When connected, it must be soldered to a thermal pad with appropriate stencil design per Analog Devices' DFN assembly guidelines; no electrical function is assigned to the pad beyond thermal conduction.

What is the maximum allowable pull-up voltage on the RST and PFO pins of the LTC2935CDC-1#TRMPBF?

The RST and PFO pins of the LTC2935CDC-1#TRMPBF are open-drain and rated for voltages up to 6V absolute maximum. However, the recommended maximum pull-up voltage is 5.5V to remain within specified operating conditions. This allows interfacing with 5V logic families while maintaining compatibility with lower-voltage domains via appropriately sized pull-up resistors (10kΩ to 470kΩ).