Analog Devices Inc. LTC2965CMS#PBF

Overview

LTC2965CMS#PBF from Analog Devices is a micropower, high-voltage single-channel voltage monitor IC designed for system-level power supply supervision. It features 100V-rated input and output capability, ±1.4% threshold accuracy over temperature, 7µA quiescent current at 100V, and configurable 10×/40× internal resistive scaling. It is used in telecom power rails, automotive battery monitoring, and industrial 24V/48V systems to generate precise undervoltage/overvoltage status signals.

For engineers reviewing the LTC2965CMS#PBF datasheet, LTC2965CMS#PBF pinout, LTC2965CMS#PBF application, or LTC2965CMS#PBF equivalent, key selection considerations include its 16-lead MSOP package with high-voltage creepage spacing, built-in hysteresis configuration via INH/INL grounding, polarity-selectable output, and compatibility with external reference sources for sub-0.5% threshold error.

Technical Context

The LTC2965CMS#PBF implements a high-impedance (70MΩ typical) internal resistive divider on VIN, enabling direct 3.5V–98V monitoring without external high-voltage resistors. Its dual comparator reference inputs (INH, INL) interface with an on-chip 2.402V buffered reference (REF), allowing threshold programming using low-voltage, low-power external dividers.

Range selection (RS pin) configures the internal divider for 10× (3.5V–24.5V monitored range) or 40× (14V–98V), while polarity selection (PS pin) determines whether OUT is inverting or noninverting relative to VIN transitions. Built-in hysteresis (14–30mV at VIN, scaled by range) is activated by grounding either INH or INL - not both - to avoid oscillation.

Key Specifications

Pinout & Package

Package: 16-Lead Plastic MSOP (0°C to 70°C operating range). Exposed pad optional for GND connection; no thermal pad requirement.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326US29D3+T and TPS3839G33DBVR, the LTC2965CMS#PBF uniquely supports direct 3.5–98V monitoring with user-configurable thresholds, built-in hysteresis, and 100V output drive - making it the only option among the three qualified for automotive, telecom, and industrial high-voltage supervision without external passive networks.

Availability

LTC2965CMS#PBF is available at Aetrix Electronics and suitable for telecom power supervision, automotive battery monitoring, and industrial 24V PLC modules requiring stable component supply across extended temperature and voltage ranges.

Supply support for LTC2965CMS#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 LTC2965CMS#PBF belongs to Linear's precision high-voltage supervisor product line, engineered specifically for robust, low-power monitoring of demanding power rails in harsh environments - including telecom infrastructure, automotive ECUs, and industrial control systems.

FAQ

What is the maximum input voltage rating for the LTC2965CMS#PBF?

The LTC2965CMS#PBF has an absolute maximum VIN rating of 140V, with guaranteed operation from 3.5V to 100V. Its internal high-value resistive divider and blocking circuitry allow safe, direct connection to 48V telecom, 24V industrial, and 12V automotive rails without external attenuation. The device remains functional and accurate across this full range, with specified parameters validated up to 100V.

How does the range selection (RS) pin affect threshold configuration in the LTC2965CMS#PBF?

The RS pin selects between 10× (RS = GND) and 40× (RS = REF or >1.4V) internal scaling of the INH and INL reference voltages. For example, with INH = 1.2V and RS = GND, VIN(RISE) = 12V; with RS = REF, VIN(RISE) = 48V. This allows the same low-voltage reference inputs (0.35–2.45V) to set thresholds across vastly different supply voltages while maintaining optimal comparator common-mode operation and accuracy.

Can the LTC2965CMS#PBF generate hysteresis without external resistors?

Yes, the LTC2965CMS#PBF supports built-in hysteresis by grounding either INH (enabling hysteresis on the falling edge) or INL (enabling hysteresis on the rising edge). At 10× range, this yields 220mV hysteresis referred to VIN; at 40× range, it yields 880mV. This eliminates external hysteresis resistors in basic configurations, though external resistor networks remain supported for custom hysteresis values or dual-threshold setups.

What is the purpose of the PS (polarity select) pin on the LTC2965CMS#PBF?

The PS pin configures the logical relationship between VIN transitions and the OUT pin state. When PS = GND, OUT is noninverting: OUT goes low when VIN falls below the INL-scaled threshold (undervoltage detection). When PS = REF or >1.4V, OUT is inverting: OUT goes low when VIN rises above the INH-scaled threshold (overvoltage detection). This enables flexible fault signaling for both UVLO and OVLO scenarios using a single device.

Is the REF pin on the LTC2965CMS#PBF intended for driving external circuitry?

Yes, the REF pin delivers a buffered 2.402V ±12mV reference with sufficient drive capability for external resistor networks biasing INH/INL, and can source/sink up to 100µA. It is also used to drive the RS and PS pins. For capacitive loads >1nF, a series damping resistor (e.g., 4.3kΩ for 10nF) is required to prevent instability, as detailed in the datasheet's Figure 6a.