Analog Devices Inc. LTC2932CF#PBF

Overview

LTC2932CF#PBF from Analog Devices (formerly Linear Technology) is a configurable six-supply voltage monitor IC for multivoltage systems, featuring ±1.5% threshold accuracy, 52μA quiescent current, adjustable reset timeout via external capacitor, and support for 16 preset voltage combinations including 5V, 3.3V, 2.5V, 1.8V, 1.5V, and dual adjustable inputs (ADJ/–ADJ). It delivers individual open-drain comparator outputs per supply and a shared RST output with guaranteed operation down to VCC = 1V - used in telecom power sequencing and server board power-good monitoring.

For engineers reviewing the LTC2932CF#PBF datasheet, LTC2932CF#PBF pinout, LTC2932CF#PBF application, or LTC2932CF#PBF equivalent, key selection criteria include verified 20-lead TSSOP package compatibility, confirmed 0°C to 70°C operating range, validated 5%–12.5% selectable supply tolerance, and documented six-input glitch-immune monitoring architecture with internal 6μA pull-ups to V2.

Technical Context

The LTC2932CF#PBF implements six independent high-impedance voltage comparators with digitally configurable thresholds selected via resistive divider on VPG and tolerance set by T0/T1 logic inputs. Its reference architecture uses a buffered 1.210V VREF with ±0.018V variation over temperature, enabling precise ratiometric threshold setting for both positive ADJ (0.5V base) and negative –ADJ (ground-referenced) modes.

Reset assertion is synchronized across all monitored supplies: RST remains low until all six inputs exceed their configured thresholds, then initiates a programmable delay (2ms/nF via CRT capacitor) before releasing. The device guarantees correct RST state at VCC ≥ 1V and supports supply margining via RDIS pin, which forces RST high without affecting comparator outputs.

Key Specifications

Pinout & Package

Package: 20-lead plastic TSSOP (4.4mm width), RoHS-compliant, moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar six-supply monitoring applications.

Compared with MAX6804US29D3+T and TPS3808G33DBVR, the LTC2932CF#PBF provides integrated six-rail monitoring with programmable thresholds, negative rail support, and reset timing control - delivering higher system-level reliability and lower total component count in complex multivoltage platforms.

Availability

LTC2932CF#PBF is available at Aetrix Electronics and suitable for desktop motherboards, telecom line cards, and network server power management requiring stable component supply, long-term lifecycle support, and commercial-temperature-grade precision supervision.

Supply support for LTC2932CF#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 acquired Linear Technology in 2017 and maintains its high-performance analog product portfolio, emphasizing precision signal conditioning, power management, and reliability-critical ICs.

The LTC2932CF#PBF belongs to Linear's supervisor and monitoring IC family, designed specifically for robust, configurable power-rail validation in multivoltage computing and communications infrastructure where accuracy, low power, and design flexibility are essential.

FAQ

What is the operating temperature range for the LTC2932CF#PBF?

The LTC2932CF#PBF is specified for 0°C to 70°C operation, making it suitable for commercial-grade applications such as desktop computers, networking equipment, and industrial control panels where ambient temperatures remain within this envelope. This grade is distinct from the I-grade (–40°C to 85°C) and H-grade (–40°C to 125°C) variants, and the part marking "C" in LTC2932CF#PBF explicitly denotes the commercial temperature range.

How does the LTC2932CF#PBF support negative voltage monitoring?

The LTC2932CF#PBF supports negative rail monitoring through its –ADJ mode on the V4 input, which references the internal VREF (1.210V) instead of ground. When configured in –ADJ, the device calculates trip voltage as VTRIP = −VREF × (R3/R4), enabling accurate detection of rails like –5.2V or –12V using an external resistor divider between the negative supply and VREF. This eliminates external level-shifting components required by most competing supervisors.

Can the LTC2932CF#PBF monitor fewer than six supplies?

Yes, the LTC2932CF#PBF can be configured to monitor fewer than six supplies by tying unused voltage inputs (e.g., V3–V6) to V1 and leaving corresponding COMP outputs unconnected. The device draws only 52μA quiescent current regardless of active input count, and its internal architecture automatically disables unused comparators - preserving accuracy and power efficiency without requiring external disable circuitry.

What is the function of the RDIS pin on the LTC2932CF#PBF?

The RDIS (Reset Disable) pin on the LTC2932CF#PBF is an active-low digital input that forces the RST output high regardless of supply voltage conditions. This allows engineers to perform supply margin testing - such as sweeping V1 or V2 with a programmable supply - without triggering a system reset. The pin features a weak internal 10μA pull-up, so it may be left floating for normal operation.

How is the reset timeout period set on the LTC2932CF#PBF?

The reset timeout period on the LTC2932CF#PBF is set by connecting an external capacitor (CRT) between the CRT pin and GND. The relationship is linear: tRST ≈ 2ms per nanofarad (e.g., 47nF yields ~94ms). Leaving CRT unconnected results in a minimum ~25μs delay. Ceramic capacitors with low leakage are recommended, as capacitor tolerance and leakage directly affect timing accuracy.