Analog Devices Inc. LTC2965CDD#PBF

Overview

LTC2965CDD#PBF from Analog Devices is a micropower, single-channel 100V voltage monitor IC with internal high-value resistive dividers, ±1.4% threshold accuracy over temperature, 7µA quiescent current, and 100V-rated open-drain output. It serves as a compact, low-power supply supervision device in high-voltage DC systems such as telecom power rails and industrial battery management.

For engineers reviewing the LTC2965CDD#PBF datasheet, LTC2965CDD#PBF pinout, LTC2965CDD#PBF application, or LTC2965CDD#PBF equivalent, key selection considerations include its 8-lead DFN package, 10x/40x scalable monitoring range (3.5–98V), built-in hysteresis enablement via INH/INL grounding, polarity-selectable output, and 100V absolute maximum input rating.

Technical Context

The LTC2965CDD#PBF integrates a precision buffered 2.402V reference (±0.4% initial accuracy), dual comparator inputs (INH/INL) with 0.35–2.45V common-mode range, and a 10x/40x programmable internal resistive divider controlled by the RS pin. Thresholds are set by scaling INH/INL voltages-e.g., 2.0V at INH with 10x yields a 20V rising VIN threshold.

Its output stage combines a 500kΩ internal pull-up to an internally regulated 3.5–5V supply and a 100V-capable active pull-down. Polarity inversion is enabled by connecting PS to REF (>1.4V), while UVLO forces OUT low when VIN drops below 3V regardless of PS state.

Key Specifications

Pinout & Package

Package: 8-Lead (3mm × 3mm) Plastic DFN (DD), exposed pad optional for thermal relief or GND connection.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage voltage monitor applications.

Compared with MAX6326US29D3+T and TLV809E29DBZR, the LTC2965CDD#PBF uniquely supports 3.5–98V adjustable monitoring with ±1.4% accuracy, integrated reference, and 100V output - making it the only viable option for telecom, industrial, and automotive high-voltage supervision where flexibility and ruggedness are mandatory.

Availability

LTC2965CDD#PBF is available at Aetrix Electronics and suitable for telecom power supervision, industrial battery management, and automotive 12V/24V system monitoring requiring stable component supply and long-term lifecycle support.

Supply support for LTC2965CDD#PBF 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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.

The LTC2965 belongs to Linear's precision voltage supervisor product line, designed specifically for high-voltage, low-power, and high-accuracy supply monitoring in harsh environments where reliability and minimal external components are critical.

FAQ

What is the operating temperature range for the LTC2965CDD#PBF?

The LTC2965CDD#PBF is rated for 0°C to 70°C ambient operation, matching the "C" grade designation in its part number. This makes it suitable for commercial and industrial indoor applications where extended temperature ranges are not required. The same die is also offered in I-grade (–40°C to 85°C) and H-grade (–40°C to 125°C) variants in identical DFN packages.

Can the LTC2965CDD#PBF monitor negative voltages?

Yes - the LTC2965CDD#PBF can monitor negative supplies when used with external level-shifting circuitry. Figure 9 in the official datasheet shows a verified configuration using an NPN transistor to shift the output of the LTC2965CDD#PBF to interface with a 5V logic system while supervising a –15V rail. The VIN pin itself must remain above –0.3V, so direct negative-voltage connection is not permitted.

How does the RS pin affect the LTC2965CDD#PBF's monitoring range?

The RS pin selects between two internal resistive divider ratios: logic low (GND) configures 10x scaling (3.5–24.5V VIN range), and logic high (≥1.4V, e.g., connected to REF) configures 40x scaling (14–98V VIN range). This allows precise threshold programming - for example, applying 2.0V to INH yields a 20V rising threshold in 10x mode or 80V in 40x mode - maximizing accuracy within the chosen range.

Does the LTC2965CDD#PBF require external passive components to function?

The LTC2965CDD#PBF operates autonomously with only VIN, GND, and optionally REF bypassing (≤1nF). However, external resistors are required to set INH/INL voltages for threshold definition. A minimal configuration uses two resistors (e.g., 909kΩ + 200kΩ) from REF to INH/INL to generate precise thresholds. Built-in hysteresis reduces this to one resistor plus ground.

What is the purpose of the PS pin on the LTC2965CDD#PBF?

The PS (Polarity Select) pin determines whether the OUT signal is inverting or noninverting relative to VIN. When PS = GND, OUT goes low when VIN falls below the INL threshold (undervoltage detection). When PS = REF or >1.4V, OUT goes low when VIN rises above the INH threshold (overvoltage detection). This single-pin control eliminates the need for external logic inversion.