Analog Devices Inc. LTC2935CDC-2

Overview

LTC2935CDC-2 from Analog Devices (formerly Linear Technology) is an ultra-low power voltage supervisor IC with active-pull-up reset and power-fail outputs, 8-pin-selectable reset thresholds (2.25V–3.30V), ±1.5% threshold accuracy over temperature, and 500nA typical quiescent current - designed for battery-powered portable equipment requiring reliable early-warning shutdown and system initialization.

For engineers reviewing the LTC2935CDC-2 datasheet, LTC2935CDC-2 pinout, LTC2935CDC-2 application, or LTC2935CDC-2 equivalent, key selection considerations include its DFN-8 (2mm × 2mm) package, active-pull-up RST/PFO outputs, 200ms reset timeout, manual reset input with 20μs minimum pulse width, and configurable 150mV power-fail margin above selected reset threshold.

Technical Context

The LTC2935CDC-2 integrates dual precision comparators with internal attenuators to monitor VCC against independently configured reset and power-fail thresholds. Its reset comparator uses 5% hysteresis on rising VCC, while the PFO comparator applies 2.5% hysteresis and triggers earlier at a fixed 150mV offset above the selected reset threshold.

It features a dedicated manual reset input (MR) with internal 900kΩ pull-up, propagation delay of 2–20μs to RST assertion, and active-pull-up outputs capable of sourcing up to 0.7×VCC at ≤100mV VOL under 3mA load - eliminating external pull-up resistors in most applications.

Key Specifications

Pinout & Package

Package: 8-lead, 2mm × 2mm plastic DFN (exposed pad optional to GND); RoHS-compliant, lead-free finish; operating ambient temperature range 0°C to 70°C (C-grade).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC2935ITS8-2#TRPBF, the LTC2935CDC-2 trades extended temperature range for smaller size and lower cost; compared with LTC2934CDC-2#TRPBF, it sacrifices threshold flexibility for zero-component configuration speed and improved noise immunity from integrated attenuators.

Availability

LTC2935CDC-2 is available at Aetrix Electronics and suitable for portable medical sensors, wireless point-of-sale terminals, and industrial asset trackers requiring stable component supply, long-term lifecycle support, and RoHS-compliant DFN packaging.

Supply support for LTC2935CDC-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 acquired Linear Technology in 2017 and maintains its precision analog product lines, including high-reliability supervisors, with global manufacturing, testing, and quality systems certified to ISO 9001 and IATF 16949.

The LTC2935 family was designed specifically for ultra-low-power battery supervision in portable and energy-harvesting systems, emphasizing sub-1μA operation, pin-configurable thresholds, and robust glitch immunity without external components.

FAQ

What is the operating temperature range for the LTC2935CDC-2?

The LTC2935CDC-2 is specified for 0°C to 70°C ambient operation (C-grade). This distinguishes it from the I-grade variant LTC2935IDC-2, which operates from –40°C to 85°C. The C-grade rating makes LTC2935CDC-2 optimal for consumer and commercial indoor applications where extended temperature range is not required.

How does the power-fail output (PFO) behave relative to the reset output (RST) in the LTC2935CDC-2?

In the LTC2935CDC-2, the PFO asserts low when VCC falls below a threshold exactly 150mV above the selected reset threshold (e.g., 3.15V PFO with 3.00V RST), and releases when VCC rises 2.5% above that PFO threshold. RST asserts at the lower threshold and releases after 200ms plus 5% hysteresis - providing deterministic, non-overlapping early warning and hard reset timing.

Can the LTC2935CDC-2 operate with supply voltages below 2.0V?

Yes - the LTC2935CDC-2 functions down to 1V VCC, with guaranteed operation across its full 1V–5.5V supply range. Its internal comparators and reference remain accurate at low voltage, and the active-pull-up outputs maintain VOL ≤100mV even at 1V supply with 200μA load, enabling use with depleted coin cells or low-VDD microcontrollers.

What is the purpose of the exposed pad on the LTC2935CDC-2 DFN package?

The exposed pad on the LTC2935CDC-2's 2mm × 2mm DFN package is electrically connected to GND and serves primarily for thermal dissipation and EMI reduction. It may be left floating or soldered to a PCB ground plane - no electrical connection is mandatory, but grounding improves thermal performance and noise immunity in sensitive analog monitoring paths.

Does the LTC2935CDC-2 require external components for basic operation?

No - the LTC2935CDC-2 requires only a 0.1μF decoupling capacitor from VCC to GND for stable operation. All threshold references, hysteresis, reset timing, and output drive circuitry are fully integrated. No external resistors, capacitors, or diodes are needed for core supervision functionality, reducing BOM count and board area versus discrete or adjustable alternatives.