Analog Devices Inc. LTC2962IUD#PBF

Overview

LTC2962IUD#PBF from Analog Devices is a quad configurable power supply supervisor IC with ±0.5% threshold accuracy over temperature, 16 selectable voltage thresholds per channel (including 5V/3.3V/2.5V/1.8V/1.5V/1.2V/1V and ±ADJ modes), adjustable reset timeout via external capacitor, and push-pull or open-drain RST output. It monitors up to four independent supply rails in high-reliability telecom, server, and automotive control systems.

For engineers reviewing the LTC2962IUD#PBF datasheet, LTC2962IUD#PBF pinout, LTC2962IUD#PBF application, or LTC2962IUD#PBF equivalent, key selection considerations include guaranteed RST operation down to VCC = 1V, ±0.5% threshold accuracy across –40°C to +85°C, support for negative voltage and overvoltage monitoring via –ADJ/+ADJ modes, and compatibility with standard 1% resistors for threshold programming.

Technical Context

The LTC2962IUD#PBF implements a 4-channel analog comparator architecture with internal 1.195V bandgap reference buffered at REF pin, enabling precise threshold selection via 4-bit ADC conversion of PG1–PG4 voltages. Each channel supports undervoltage detection with ±0.5% accuracy over full industrial temperature range and includes glitch-immune propagation delay (20–40µs) to RST output.

Reset timing is controlled either by an external capacitor on RT (12ms/nF scaling) or internal 200ms timer when RT tied to VCC. The RST output is guaranteed valid for VCC ≥ 1V and supports both open-drain (DVCC = GND) and push-pull (DVCC ≥ 1.6V) configurations with 6µA internal pull-up or active drive to DVCC.

Key Specifications

Pinout & Package

16-lead (3mm × 3mm) plastic QFN package with exposed pad (pin 17), RoHS-compliant, moisture-sensitive level 3. Thermal resistance θ_JA = 68°C/W, θ_JC = 7.5°C/W. Exposed pad connection to PCB ground is optional but recommended for thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3431QPWRQ1 and MAX6816ESE+, the LTC2962IUD#PBF delivers superior accuracy (±0.5% vs. ±1.0–1.5%), full quad-rail configurability, and unique ±ADJ mode for non-standard rails - making it the only option capable of single-chip supervision of mixed positive/negative and custom-voltage systems.

Availability

LTC2962IUD#PBF is available at Aetrix Electronics and suitable for telecom infrastructure, automotive control units, and industrial PLC modules requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for LTC2962IUD#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 LTC2962 family was designed specifically for high-accuracy, multi-rail power supply monitoring in mission-critical systems where reliability, temperature stability, and flexible threshold configuration are essential - targeting telecom, server, and automotive applications.

FAQ

What is the minimum VCC voltage required for LTC2962IUD#PBF to assert a valid RST output?

The LTC2962IUD#PBF guarantees correct RST output state for VCC input voltage down to 1V. Below this level, internal circuitry may not operate reliably, and RST behavior is undefined. This feature ensures robust reset assertion during brownout conditions common in automotive and industrial environments where supply voltage can dip transiently.

Can LTC2962IUD#PBF monitor negative supply voltages like –5V or –12V?

Yes, the LTC2962IUD#PBF supports negative voltage monitoring using the –ADJ mode on any channel (V1–V4). In –ADJ mode, the device compares the input voltage to a 0.5V internal reference, allowing undervoltage detection on negative rails - for example, configuring V4 to assert RST when –12V drops below –11.4V (–5% threshold). External resistor dividers are required to scale the negative input into the 0–0.5V range at the Vn pin.

How does the LTC2962IUD#PBF achieve ±0.5% threshold accuracy with standard 1% resistors?

The LTC2962IUD#PBF uses an internal 4-bit ADC to digitize the voltage at each PG input relative to the 1.195V REF output. This digital value selects one of 16 pre-calibrated thresholds stored in mask ROM. Because the ADC and reference are trimmed together, the overall threshold error remains ±0.5% over temperature - even when using 1% external resistors to generate the PG voltage. This eliminates the need for precision resistors or post-assembly calibration.

What is the function of the RDIS pin on the LTC2962IUD#PBF, and how is it used in practice?

The RDIS (Reset Disable) pin on the LTC2962IUD#PBF forces the RST output high regardless of monitored supply conditions when pulled low. This enables safe voltage margining - for example, temporarily lowering the 3.3V rail to 3.0V to verify system robustness without triggering a processor reset. During normal operation, RDIS is left open (internally pulled up to VCC) so RST responds to actual supply faults.

Does the LTC2962IUD#PBF support overvoltage detection, and if so, how is it implemented?

Yes, the LTC2962IUD#PBF supports overvoltage detection using the +ADJ mode. In +ADJ mode, the device compares the Vn input to a 0.5V internal reference. By placing an external resistor divider between the supply to be monitored and ground, the voltage at Vn is scaled down - for example, a 10:1 divider on a 12V rail yields 1.2V at Vn, which exceeds 0.5V. When the supply rises above the corresponding threshold (e.g., 12.6V for +5% OV), the comparator triggers RST assertion.