Analog Devices Inc. LTC2965IDD#PBF

Overview

LTC2965IDD#PBF from Analog Devices is a micropower, high-voltage single-channel voltage monitor IC designed for precise undervoltage/overvoltage detection in systems with supply rails up to 100V. 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 battery-powered telecom equipment to generate reliable power-good signals during brownout events.

For engineers reviewing the LTC2965IDD#PBF datasheet, LTC2965IDD#PBF pinout, LTC2965IDD#PBF application, or LTC2965IDD#PBF equivalent, this page delivers verified functional specifications, validated package mapping to the 8-lead 3mm × 3mm DFN, confirmed threshold scaling behavior (10x/40x), built-in hysteresis configuration logic, and real-world comparator propagation delay (40–80µs) - all directly traceable to the official Linear Technology (Analog Devices) datasheet.

Technical Context

The LTC2965IDD#PBF implements a high-impedance voltage sensing path via internal 70MΩ/200kΩ resistive dividers scaled by RS pin selection (10x or 40x), enabling accurate VIN monitoring from 3.5V to 98V while drawing only 3–15µA across its full input range. Its dual comparator reference inputs (INH/INL) interface with external resistive dividers biased from the 2.402V on-chip reference, supporting programmable rising/falling thresholds with ±1.9mV offset voltage and ±0.4% internal divider range error.

Output polarity is configurable via PS pin (ground = noninverting; REF or >1.4V = inverting), and built-in hysteresis (14–30mV at VIN, scaled per range) is enabled by grounding INH or INL. The 100V-tolerant OUT pin integrates blocking circuitry to prevent back-conduction when pulled up to external voltages ≤100V, and guarantees low-state operation down to VIN ≥1.25V regardless of PS state.

Key Specifications

Pinout & Package

Package: 8-Lead (3mm × 3mm) Plastic DFN (DD package), exposed pad optional for thermal relief or GND connection. Pin 9 is exposed pad (not electrically connected unless tied to GND).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV809E33DBZR and MAX6326UR29D3+, the LTC2965IDD#PBF uniquely supports 3.5–100V monitoring with user-programmable thresholds, built-in hysteresis, and 100V-tolerant output - making it irreplaceable in telecom, automotive, and industrial high-voltage supervision where alternatives lack voltage range, configurability, or ruggedness.

Availability

LTC2965IDD#PBF is available at Aetrix Electronics and suitable for telecom power supervision, automotive battery monitoring, and industrial 24V PLC I/O modules requiring stable component supply across extended temperature ranges.

Supply support for LTC2965IDD#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 (formerly Linear Technology) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving precision instrumentation, industrial automation, and communications markets.

The LTC2965 belongs to Analog Devices' high-voltage supervisor IC product line, engineered specifically for accurate, low-power monitoring of industrial, automotive, and telecom power rails up to 100V with minimal external components.

FAQ

What is the operating temperature range for the LTC2965IDD#PBF?

The LTC2965IDD#PBF is rated for –40°C to +85°C ambient operation, matching the "I" grade designation in its part number. This extended range supports deployment in automotive engine compartments, industrial control cabinets, and outdoor telecom enclosures where thermal stability is critical. The device maintains ±1.4% threshold accuracy across this full span, as verified in the Electrical Characteristics table of the official datasheet.

Can the LTC2965IDD#PBF monitor negative voltages?

Yes - the LTC2965IDD#PBF can monitor negative supplies when configured with external level-shifting circuitry, as demonstrated in Figure 9 of the datasheet. In that application, it supervises a –15V rail using an NPN transistor (Q1) to level-shift the open-drain OUT signal to a 5V logic domain. The IC itself must be powered from a positive supply (≥3.5V), but VIN can be referenced to a negative potential via appropriate biasing of INH/INL and REF.

How does the RS pin affect the LTC2965IDD#PBF's voltage monitoring range?

The RS pin selects between two internal resistive divider scaling factors: grounding RS configures 10× scaling (3.5V–24.5V VIN range), while connecting RS to REF or >1.4V enables 40× scaling (14V–98V VIN range). This choice directly determines the valid input voltage window and impacts threshold accuracy - smaller ranges (e.g., 10×) yield lower absolute error for a given INH/INL voltage setting, as confirmed in the VIN Error Voltage specifications.

What is the maximum external pull-up voltage allowed on the OUT pin of the LTC2965IDD#PBF?

The OUT pin of the LTC2965IDD#PBF supports external pull-up voltages up to 100V, as specified in both the Absolute Maximum Ratings (OUT: –0.3V to 140V) and Applications Information sections. Its internal blocking circuitry prevents back-conduction into the IC's internal supply, allowing safe interfacing with 24V, 48V, or 96V logic domains without additional protection components - a key differentiator versus standard comparators.

Does the LTC2965IDD#PBF include undervoltage lockout (UVLO) functionality?

Yes - the LTC2965IDD#PBF incorporates a dedicated undervoltage lockout circuit that forces the OUT pin low whenever VIN drops below 3V (rising edge) with 70mV hysteresis, independent of INH/INL configuration or PS polarity. This ensures fail-safe behavior during power-up or brownout conditions, guaranteeing a known output state even before the main comparator becomes operational - a feature explicitly documented in the Electrical Characteristics table.