Analog Devices Inc. LTC2965IMS#TRPBF

Overview of the LTC2965IMS#TRPBF Single-Channel Voltage Monitor

Voltage monitoring is fundamental in modern electronic system design, especially when handling high voltage supply rails or environments prone to supply variation. The LTC2965IMS#TRPBF from Analog Devices serves as a robust, single-channel voltage supervisor tailored for precise monitoring of high voltage supplies. Engineered for maximum versatility, it operates over a wide input range of 3.5V to 100V, making it suitable for applications in portable equipment, automotive and industrial electronics, and telecom systems. This device integrates a micropower design with an internal high-value resistive divider, providing engineers a compact, high-accuracy solution for supply voltage supervision in demanding designs.

Main Features and Advantages of the LTC2965IMS#TRPBF

The LTC2965IMS#TRPBF distinguishes itself in the high-voltage supervisor market with several noteworthy features:

Wide Input & Monitoring Range: The device supports supply voltages from 3.5V up to 100V, with monitoring capability spanning 3.5V to 98V. This flexibility enables its use across multiple supply architectures and system voltages.

Micropower Operation: With a typical quiescent current of only 7μA, the LTC2965IMS#TRPBF minimizes system power consumption, making it ideal for battery-powered or energy-sensitive designs.

Threshold Accuracy: The device offers ±1.4% (max) threshold accuracy over temperature, supporting designs requiring tight voltage supervision tolerances.

Flexible Threshold Setting: Engineers can program high and low voltage thresholds using two comparator reference inputs (INH and INL) and an external resistor divider network.

Adjustable Hysteresis: The LTC2965IMS#TRPBF integrates selectable built-in hysteresis to improve noise immunity and system reliability—critical in industrial or high-noise environments.

Polarity Selection & High Voltage Compatible Outputs: The output configuration is flexible (open-drain or open-collector, up to 100V), and output polarity is user-selectable. An integrated pull-up resistor further simplifies external circuitry.

Package Flexibility: Available in space-conserving 16-lead MSOP and 8-lead 3mm × 3mm DFN packages, acknowledging layout constraints in modern, densely packed PCBs.

Robust Environmental Compliance: The device is RoHS3 compliant and unaffected by REACH regulations, suiting global manufacturing requirements.

In-Depth Electrical Specifications of the LTC2965IMS#TRPBF

System designers often require deep insight into device parameters to ensure design robustness. Key LTC2965IMS#TRPBF electrical specifications include:

Input supply voltage range: 3.5V to 100V (monitoring up to 98V)

Input supply current: typically 7μA, max 15μA at VIN = 100V (40x range)

Threshold reference voltage: 2.378V (min) to 2.426V (max) over full temperature

Comparator built-in hysteresis: selectable, typically 22mV (rising or falling, with INH or INL grounded)

Output voltages: high output can be pulled to user-defined voltages up to 100V via external resistor

Output current capability: capable of sourcing -7.5μA to -15μA at high state (VIN = 3.5V, OUT = GND)

Comparator propagation delay: typically 40μs to 80μs depending on overdrive conditions

Operating temperature ranges: -40°C to 85°C (industrial grade), with other grades available

Moisture sensitivity and environmental ratings: Unlimited MSL, RoHS3 compliant

Packaging Options and Heat Dissipation Properties of the LTC2965IMS#TRPBF

The LTC2965IMS#TRPBF is delivered in a compact yet thermally capable 16-lead MSOP package, ideal for surface-mount assembly. The 16-MSOP features a typical junction-to-ambient thermal resistance (θJA) of 120°C/W, ensuring device reliability across the rated operating range. For applications with more stringent thermal demands or space limitations, compatible variants such as the 8-lead 3mm × 3mm DFN package are also offered under the LTC2965 series, providing design flexibility for layout optimization.

Functional Explanation and Application Recommendations LTC2965IMS#TRPBF Architecture and Implementation

At the heart of the LTC2965IMS#TRPBF lies a single, high-voltage channel composed of an internal high-value resistive divider and a comparator. The integrated reference allows thresholds to be defined using external divider networks, creating a scalable and highly configurable voltage monitoring architecture.

Range selection is implemented via the RS pin, allowing a choice between 10x and 40x scaling of the input voltage to the comparator reference inputs. For instance, choosing 10x permits monitoring of lower voltage rails with higher accuracy, while 40x extends the monitor range for higher-voltage systems.

The comparator output (OUT) can be configured for either inverting or non-inverting operation (polarity selection via the PS pin), accommodating both undervoltage and overvoltage detection needs with minimal external circuitry. The OUT pin is robust, rated up to 100V for flexible system integration.

The internal reference (REF pin) provides a highly accurate supply for threshold-setting resistor networks and for configuring the device logic pins, ensuring consistent behavior regardless of input voltage variation.

Configuration Methods and Threshold Adjustment for the LTC2965IMS#TRPBF

Implementing precise voltage thresholds with the LTC2965IMS#TRPBF involves setting INH (high threshold) and INL (low threshold) pins, typically using resistor divider networks biased from the on-chip reference (REF). The comparator assesses the scaled VIN against INH/INL, facilitated by the selected internal divider (10x/40x) based on the RS pin setting.

To configure thresholds:

Calculate suitable divider resistor values, ensuring INH/INL voltages remain within the specified common mode range (0.35V to 2.45V).

For desired hysteresis, ground INH (for rising edge) or INL (for falling edge), automatically enabling built-in hysteresis for enhanced noise immunity.

When establishing both upper and lower thresholds, care must be taken to prevent overlap (INL > INH), which may cause comparator instability; built-in hysteresis may be leveraged to resolve such conditions.

Example: For a 24V rail requiring an undervoltage detection at 18V and hysteresis, select RS=10x. Calculate resistor values so that INH = 2.0V and INL = 1.8V (thresholds at 20V and 18V respectively).

Precision in component selection (use of 1% tolerance resistors and proper calculation of divider currents considering device leakage) is essential to ensure accurate system threshold response—especially at elevated temperatures or in low-current applications.

Common Use Cases for the LTC2965IMS#TRPBF

The LTC2965IMS#TRPBF is ideally suited for:

Supervising high voltage DC rails in industrial control systems, where long supply lines may introduce voltage drops or transients.

Battery-powered portable instrumentation, where low quiescent current extends operational life while ensuring brown-out protection.

Automotive and telecom infrastructure, where regulatory compliance and high-voltage safety margins are essential.

General purpose undervoltage or overvoltage monitoring in distributed power systems, where board space, configurability, and supply voltage diversity are design constraints.

Possible Alternative or Substitute Devices for the LTC2965IMS#TRPBF

Selection engineers and procurement personnel should consider that while the LTC2965IMS#TRPBF offers unique advantages for high voltage, low power monitoring, several alternatives may fit similar use cases. Among these, other products in the Linear Technology (Analog Devices) LTC2965 series (such as LTC2965HMS#TRPBF for extended temperature) provide form-, fit-, and function-compatible replacements for designs requiring different grades.

For multi-channel or lower supply voltage applications, Analog Devices and other vendors (e.g., Texas Instruments and Maxim Integrated) offer supervisors such as the TLV803/804/805 or MAX706 series. However, these alternatives may lack the 100V input capability or the same micropower feature set and should be evaluated against both electrical and environmental requirements.

Conclusion

The LTC2965IMS#TRPBF from Analog Devices is a best-in-class solution for engineers needing reliable, precise, and highly configurable high-voltage supervision. Its wide supply range, ultra-low quiescent current, flexible threshold setting, and robust, compact packaging position it as an optimal selection for a broad spectrum of critical monitoring applications. With this overview and practical configuration insights, selection and design engineers are well-equipped to implement the LTC2965IMS#TRPBF for both new designs and upgrades to existing platforms, ensuring system resilience and compliance across industries.