Analog Devices Inc. LTC2963HUDC-1#TRPBF

Overview

LTC2963HUDC-1#TRPBF from Analog Devices is a quad configurable power supply supervisor with watchdog timer, designed for high-reliability systems requiring precise voltage monitoring across four rails. It delivers ±0.5% threshold accuracy over –40°C to +125°C, supports adjustable reset timeout (12–240 ms) and non-windowed watchdog timeout (100 ms–2 s), and features push-pull or open-drain RST/WDO outputs. It is used in automotive control units to ensure safe microprocessor startup and fault recovery under voltage transients.

For engineers reviewing the LTC2963HUDC-1#TRPBF datasheet, LTC2963HUDC-1#TRPBF pinout, LTC2963HUDC-1#TRPBF application, or LTC2963HUDC-1#TRPBF equivalent, key selection criteria include H-grade temperature range, ±ADJ mode for negative/overvoltage detection, programmable watchdog initial timeout via WDS, guaranteed RST low down to VCC = 1V, and compatibility with 1% external resistors for threshold configuration.

Technical Context

The LTC2963HUDC-1#TRPBF implements a 4-channel analog comparator bank with per-channel threshold selection via 4-bit ADC sampling of PG1–PG4 inputs referenced to a 1.195V buffered bandgap. Each channel supports 16 modes including fixed thresholds (5V to 1V at –4%/–6%) and ±ADJ (0.5V reference), enabling undervoltage, overvoltage, and negative-supply monitoring.

Its integrated watchdog uses an RC-timed upper timeout (CWT-based) with three-stage initial timeout selection (WDS), and propagates faults to both WDO and RST outputs. The device operates with dual supplies: VCC (2.25–5.5V) powers analog circuitry and internal pull-ups, while DVCC (1.6–5.5V) sets logic swing for RST/WDO - grounding DVCC configures open-drain operation.

Key Specifications

Pinout & Package

20-lead 3mm × 4mm plastic QFN (UDC package) with exposed pad (Pin 21), rated for –40°C to +125°C operation. 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 MAX6361KA29+T and TPS3307-18DGNR, the LTC2963HUDC-1#TRPBF offers full quad-channel configurability, ±0.5% accuracy across H-grade temperature, and integrated non-windowed watchdog - making it uniquely suited for safety-critical, multi-rail embedded systems demanding precision and flexibility.

Availability

LTC2963HUDC-1#TRPBF is available at Aetrix Electronics and suitable for automotive control systems, industrial PLCs, telecom power shelves, and medical imaging equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LTC2963HUDC-1#TRPBF 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 LTC2963HUDC-1#TRPBF belongs to the LTC2962/LTC2963/LTC2964 family of configurable supervisors, engineered specifically for mission-critical power monitoring in harsh environments where accuracy, reliability, and design flexibility are non-negotiable.

FAQ

What is the operating temperature range of the LTC2963HUDC-1#TRPBF?

The LTC2963HUDC-1#TRPBF is rated for –40°C to +125°C (H-grade), validated across this full range for all electrical specifications including ±0.5% threshold accuracy, reset timeout, and watchdog timing. This makes LTC2963HUDC-1#TRPBF suitable for under-hood automotive, industrial, and aerospace applications where ambient temperatures exceed standard commercial or industrial grades.

How does the LTC2963HUDC-1#TRPBF support negative voltage monitoring?

The LTC2963HUDC-1#TRPBF supports negative voltage monitoring via its –ADJ mode: each channel (V1–V4) compares the input to a 0.5V internal reference. When a negative supply is routed through an external resistive divider that scales it to 0.5V at the Vn pin, the device detects undervoltage as the negative rail becomes *less negative* - enabling precise monitoring of –5V, –12V, or –15V rails without additional op-amps. This functionality is confirmed in the datasheet's Applications Information section.

Can the LTC2963HUDC-1#TRPBF be used without external capacitors?

Yes - the LTC2963HUDC-1#TRPBF supports fixed timing modes: tie RT to VCC for a guaranteed 200 ms reset timeout, and tie WT to VCC for a fixed 1.6 s watchdog upper timeout. These internal timers eliminate the need for external capacitors in designs where precise, repeatable timing is preferred over adjustability. All other functions (monitoring, RST, WDO, MR, RDIS) operate fully without capacitors.

What is the purpose of the WDS pin on the LTC2963HUDC-1#TRPBF?

The WDS (Watchdog Initial Select) pin on the LTC2963HUDC-1#TRPBF is a three-state input that sets the watchdog timeout duration *immediately after any reset event*. A logic low selects nominal timeout (tWDU), an open state selects 8× tWDU, and a logic high selects 64× tWDU - allowing the MCU extra time to initialize peripherals and begin issuing watchdog feeds before the first timeout expires. This prevents spurious watchdog resets during boot.

Does the LTC2963HUDC-1#TRPBF require external resistors for threshold configuration?

Yes - the LTC2963HUDC-1#TRPBF uses external 1% resistors connected between REF and GND to generate precise voltage taps applied to PG1–PG4. Each tap selects one of 16 thresholds per channel. The internal 4-bit ADC digitizes the PG voltage, enabling ±0.5% accuracy despite using low-cost 1% resistors. No configuration is required if fixed thresholds (e.g., 3.3V –4%) are selected via direct REF/GND connections per datasheet Table 1.