Analog Devices Inc. LTC2965HDD#PBF

Overview

LTC2965HDD#PBF from Analog Devices is a micropower, high-voltage single-channel voltage monitor IC designed for precise undervoltage/overvoltage supervision in systems with 3.5V–100V supply rails. It features internal 10×/40× resistive dividers, ±1.4% threshold accuracy over temperature, 7µA quiescent current, and a 100V-rated open-drain output with integrated 500kΩ pull-up. It is used in automotive power rail monitoring where compact, low-power, high-accuracy fault detection is required.

For engineers reviewing the LTC2965HDD#PBF datasheet, LTC2965HDD#PBF pinout, LTC2965HDD#PBF application, or LTC2965HDD#PBF equivalent, key selection considerations include its –40°C to 125°C operating range, built-in hysteresis configuration via INH/INL grounding, polarity-selectable output, and compatibility with external reference sources for sub-0.5% VIN threshold error.

Technical Context

The LTC2965HDD#PBF implements a high-impedance (70MΩ typical) internal resistive divider on VIN, enabling direct monitoring of up to 100V with only 7µA supply current. Its dual comparator reference inputs (INH, INL) interface with externally biased resistive networks referenced to the 2.402V buffered REF output, allowing independent rising/falling threshold programming.

Threshold scaling is controlled by the RS pin (10× for 3.5V–24.5V VIN range; 40× for 14V–98V), while PS selects inverting/noninverting output polarity. Built-in hysteresis (±14–30mV at input, scaled to ±220mV/±880mV at VIN) is activated by grounding either INH or INL-enabling robust noise immunity without external components.

Key Specifications

Pinout & Package

8-Lead (3mm × 3mm) Plastic DFN package with exposed pad (optional GND connection). Pin 1 = VIN, Pin 2 = REF, Pin 3 = INH, Pin 4 = INL, Pin 5 = OUT, Pin 6 = GND, Pin 7 = RS, Pin 8 = PS.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV809E33DBZR and MAX6375XR29D3+, the LTC2965HDD#PBF delivers unique 100V monitoring, user-programmable thresholds via INH/INL, integrated REF, and guaranteed ±1.4% accuracy over –40°C to 125°C - making it the only option for precision high-voltage supervision in automotive and industrial designs.

Availability

LTC2965HDD#PBF is available at Aetrix Electronics and suitable for automotive battery management, industrial 48V power systems, and telecom rectifier supervision requiring stable component supply across extended temperature ranges.

Supply support for LTC2965HDD#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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.

The LTC2965 belongs to Analog Devices' precision voltage supervisor product line, engineered for high-voltage, low-power, and high-accuracy monitoring in harsh environments - especially automotive under-hood and industrial power systems.

FAQ

What is the maximum input voltage the LTC2965HDD#PBF can monitor?

The LTC2965HDD#PBF supports an input voltage range of 3.5V to 100V on the VIN pin, with absolute maximum rating of 140V. Its internal high-value resistive divider enables direct monitoring of 12V, 24V, 48V, and 96V rails without external components. The actual usable monitor range depends on the RS pin setting: 3.5V–24.5V at 10× scaling or 14V–98V at 40× scaling. Operation beyond 100V violates recommended operating conditions.

How does the LTC2965HDD#PBF achieve ±1.4% threshold accuracy over temperature?

The LTC2965HDD#PBF achieves ±1.4% max threshold accuracy over –40°C to 125°C through trimmed internal resistive dividers (±0.4% range error), low-offset comparators (±3mV VOS), and a highly stable 2.402V reference (±24mV over temperature). These specifications are guaranteed across the full H-grade temperature range and validated in the Electrical Characteristics table of the official datasheet. External resistor tolerance contributes additional error, so 0.1% resistors are recommended for sub-0.5% total system accuracy.

Can the LTC2965HDD#PBF be used to monitor negative voltages?

Yes - the LTC2965HDD#PBF can monitor negative supplies when configured with external level-shifting circuitry. Figure 9 in the datasheet shows a verified implementation using an NPN transistor (Q1) to shift the OUT signal from a –15V rail to a 5V logic domain. The VIN pin itself must remain ≥ –0.3V, so the negative rail is applied to the collector of Q1, not directly to VIN. This technique preserves the IC's internal ground reference while enabling supervision of negative power domains.

What is the purpose of the RS and PS pins on the LTC2965HDD#PBF?

The RS (Range Select) pin configures the internal resistive divider scaling: logic-low selects 10× (for 3.5V–24.5V VIN), logic-high selects 40× (for 14V–98V VIN). The PS (Polarity Select) pin determines output behavior: logic-low yields noninverting operation (OUT goes low when VIN falls below INL×RANGE), logic-high yields inverting operation (OUT goes low when VIN rises above INH×RANGE). Both pins accept voltages referenced to GND and may be tied to REF (2.4V) or GND for configuration.

Does the LTC2965HDD#PBF require external components to operate?

The LTC2965HDD#PBF operates autonomously with only VIN, GND, and optional pull-up on OUT - but external components are required for configurable threshold operation. At minimum, two resistors are needed to bias INH and INL from the REF pin. For built-in hysteresis, one of INH or INL is grounded (reducing to a single resistor). A 1µF capacitor on REF is recommended for stability; bypass caps on INH/INL improve noise immunity. No external capacitors are required for basic UVLO functionality with fixed thresholds.