Analog Devices Inc. LTC2963IUDC-1#PBF

Overview

LTC2963IUDC-1#PBF from Analog Devices is a quad configurable power supply supervisor IC with integrated non-windowed watchdog timer, ±0.5% threshold accuracy over temperature, adjustable reset timeout (12–240 ms), and 20-lead 3mm × 4mm QFN package rated for –40°C to +85°C operation. It monitors up to four independent supply rails (e.g., 5V, 3.3V, 1.8V, ±ADJ) and delivers reliable reset assertion during undervoltage, overvoltage, or negative voltage faults in telecom server power systems.

For engineers reviewing the LTC2963IUDC-1#PBF datasheet, LTC2963IUDC-1#PBF pinout, LTC2963IUDC-1#PBF application, or LTC2963IUDC-1#PBF equivalent, key selection criteria include its ±0.5% threshold accuracy across temperature, programmable watchdog timeout (100 ms/nF), push-pull or open-drain RST/WDO outputs, and support for both positive and negative adjustable monitoring modes.

Technical Context

The LTC2963IUDC-1#PBF implements a 4-channel analog comparator bank with per-channel 16-mode threshold selection via external 1% resistive dividers on PG1–PG4 inputs, referenced to a buffered 1.195 V internal bandgap. Each channel supports UV/OV/–ADJ modes with ±0.5% accuracy over –40°C to +85°C.

Its watchdog function uses an internal timer driven by capacitor CWT on WT pin (100 ms/nF scaling), with three initial timeout options selected via WDS (logic low = nominal tWDU, open = 8×tWDU, high = 64×tWDU). RST and WDO are push-pull when DVCC ≥ 1.6 V, otherwise open-drain with 6 µA internal pull-up to VCC.

Key Specifications

Pinout & Package

Package: 20-lead 3 mm × 4 mm plastic QFN (UDC), exposed pad (Pin 21) optional PCB ground connection. Thermal resistance θJA = 52°C/W, θJC = 6.8°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad supervisor with watchdog applications.

Compared with MAX6816ESE+ and TPS3307-33DGNR, the LTC2963IUDC-1#PBF provides full quad monitoring with ±0.5% accuracy, scalable watchdog timing, and flexible output drive - delivering higher system-level reliability and reduced BOM count in complex embedded power architectures.

Availability

LTC2963IUDC-1#PBF is available at Aetrix Electronics and suitable for telecom server power sequencing, automotive ADAS domain controllers, industrial PLC backplanes, and high-density data center GPU accelerator cards requiring stable component supply and long-term lifecycle assurance.

Supply support for LTC2963IUDC-1#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 LTC2963IUDC-1#PBF belongs to the LTC2962/LTC2963/LTC2964 family of configurable quad supervisors, designed specifically for high-reliability power monitoring in network infrastructure, server platforms, and safety-critical embedded systems where precision, flexibility, and watchdog integrity are essential.

FAQ

What is the operating temperature range for the LTC2963IUDC-1#PBF?

The LTC2963IUDC-1#PBF is specified for operation from –40°C to +85°C (I-grade), making it suitable for industrial and extended-temperature commercial applications. Its ±0.5% threshold accuracy is guaranteed across this full range, ensuring consistent performance in thermally demanding environments such as telecom base stations and automotive ECUs.

How does the LTC2963IUDC-1#PBF implement its ±0.5% threshold accuracy?

The LTC2963IUDC-1#PBF achieves ±0.5% threshold accuracy through a combination of a highly stable 1.195 V bandgap reference (±12 mV over temperature), precision internal comparator design, and a 4-bit ADC that digitizes PG1–PG4 input voltages to select one of 16 calibrated thresholds per channel - all validated across –40°C to +85°C.

Can the LTC2963IUDC-1#PBF monitor negative supply voltages?

Yes - the LTC2963IUDC-1#PBF supports –ADJ mode on any channel (V1–V4), where the input is compared to a 0.5 V internal reference. When used with an external resistive divider, –ADJ enables undervoltage monitoring of negative rails (e.g., –12 V) or overvoltage monitoring of positive supplies, without requiring external op-amps or level shifters.

What is the function of the WDS pin on the LTC2963IUDC-1#PBF?

The WDS pin on the LTC2963IUDC-1#PBF is a three-state input that selects the initial watchdog timeout period following any reset event: logic low = nominal tWDU, open = 8×tWDU, logic high = 64×tWDU. This accommodates extended firmware initialization times before watchdog supervision begins, preventing spurious timeouts during boot.

Does the LTC2963IUDC-1#PBF require external pull-up resistors on RST and WDO?

No - the LTC2963IUDC-1#PBF includes internal 6 µA pull-up current sources to VCC on both RST and WDO. External pull-ups are optional and only needed if faster rise times or VOH > VCC are required. When DVCC ≥ 1.6 V, RST and WDO operate as active push-pull outputs, eliminating pull-up dependency entirely.