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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Supervisors

Analog Devices Inc. LTC2911CDDB-2

Name: LTC2911CDDB-2
Brand: Analog Devices Inc.
SKU: LTC2911CDDB-2
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LTC2911CDDB-2

Manufacturer:: Analog Devices Inc.

Category:: Supervisors

Package:: 8-WFDFN Exposed Pad

Datasheet:: LTC2911CDDB-2.pdf

Description:: IC SUPERVISOR 3 CHANNEL 8DFN

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Product details

Overview

LTC2911CDDB-2 from Analog Devices (formerly Linear Technology) is a precision triple supply monitor IC with integrated power-fail comparator and latched reset functionality. It monitors 3.3V (V1), 2.5V (V2), and an adjustable input (ADJ) with ±1.5% threshold accuracy over 0°C to 70°C, supports internal 200ms reset timeout, and operates down to 0.5V V_CC. It is used in desktop computers and industrial power management systems for reliable system initialization and early brownout warning.

For engineers reviewing the LTC2911CDDB-2 datasheet, LTC2911CDDB-2 pinout, LTC2911CDDB-2 application, or LTC2911CDDB-2 equivalent, key selection criteria include its fixed 3.3V/2.5V dual-supply monitoring capability, PFI-configurable power-fail threshold, TMR latch for margin testing, low 30µA quiescent current, and DFN-8 (3mm × 2mm) package compatibility with space-constrained PCB layouts.

Technical Context

The LTC2911CDDB-2 implements three independent voltage comparators: one fixed 3.3V monitor (V1), one fixed 2.5V monitor (V2), and one adjustable 0.5V-threshold comparator (ADJ), all with guaranteed ±1.5% accuracy across temperature. Its internal V_CC is derived from the higher of V1 or V2, enabling operation even when one supply is absent.

A dedicated power-fail comparator monitors the PFI input with 500mV falling-edge threshold and 15mV hysteresis, driving the open-drain PFO output for early warning. The TMR pin supports three modes: external capacitor timing, internal 200ms timeout (TMR = V1), or latch mode (TMR = GND) to hold RST state during voltage margining.

Key Specifications

Parameter	Value and Actual Design Meaning
V1 Threshold	3.086V nominal (3.3V − 6.5%), ±1.5% accuracy ensures reliable 3.3V rail supervision without false resets under full temp range.
V2 Threshold	2.338V nominal (2.5V − 6.5%), ±1.5% accuracy enables precise 2.5V supply monitoring for logic or analog subsystems.
ADJ Threshold	500mV ±7.5mV, allows resistive divider configuration of third supply threshold (e.g., 1.2V, 1.8V, or custom rails).
PFI Threshold	500mV falling edge / 515mV rising edge, 3% hysteresis prevents chatter during slow supply decay near failure point.
Reset Timeout	Internally fixed 200ms (TMR = V1) or externally programmable (9.4ms/nF), defines minimum valid-supply duration before RST deassertion.
Quiescent Current	30µA typical at 25°C, drawn from higher of V1/V2, minimizes loading on monitored supplies in battery-backed or low-power systems.
Operating Temp	0°C to 70°C (Commercial grade), validated for stable performance in desktop PCs, network infrastructure, and industrial control panels.

Pinout & Package

Package: 8-lead (3mm × 2mm) plastic DFN with exposed pad (pin 9, optional GND connection). Thermal resistance θ_JA = 76°C/W enables reliable operation at full rated load without forced airflow.

Pin/Terminal	Circuit Role	Design Meaning
PIN 1 (PFI)	Power-fail input	Accepts resistive-divider-scaled voltage; asserts PFO low when falling below 500mV - used for early warning of primary supply collapse.
PIN 2 (ADJ)	Adjustable monitor input	0.5V threshold comparator input; configured via resistor divider to supervise third supply (e.g., 1.2V, 1.8V, or custom rail).
PIN 3 (TMR)	Reset timeout/latch control	Configures reset timing mode: open = ~400µs min, V1 = 200ms internal, GND = latch RST state for margin testing.
PIN 4 (GND)	Device ground reference	Primary return path for all comparators and outputs; exposed pad (pin 9) must be connected to PCB GND for thermal and electrical integrity.
PIN 5 (RST)	Reset logic output	Open-drain output pulled low when any monitored supply (V1/V2/ADJ) falls below threshold; weak internal pull-up to V1 (~29µA).
PIN 6 (PFO)	Power-fail logic output	Open-drain output pulled low when PFI < 500mV; provides early warning signal for controlled shutdown before main reset triggers.
PIN 7 (V1)	3.3V supply monitor & power source	Monitors 3.3V rail at −6.5% threshold (3.086V); also supplies internal V_CC when ≥ V2, requiring 0.1µF bypass capacitor.
PIN 8 (V2)	2.5V supply monitor & power source	Monitors 2.5V rail at −6.5% threshold (2.338V); contributes to V_CC generation when > V1, requires 0.1µF bypass capacitor.

Key Features

Feature	Design Value
Triple simultaneous monitoring	Independent 3.3V, 2.5V, and adjustable thresholds enable single-chip supervision of multi-rail systems without external comparators.
±1.5% threshold accuracy	Guaranteed over 0°C–70°C eliminates need for design margin beyond supply tolerance - reduces risk of false resets or late triggering.
Configurable power-fail warning	PFI input with 500mV threshold and 15mV hysteresis allows precise early detection of input supply collapse before critical rails fail.
Reset latch for margin testing	TMR pin pulled to GND holds RST in current state, enabling safe voltage stress testing without unintended system reset during validation.
Ultralow operating voltage	RST/PFO outputs remain functional down to V_CC = 0.5V, ensuring deterministic behavior during power-up/power-down sequencing.

Applications

Desktop Computer Power Sequencing	Industrial PLC I/O Module Supervision
Use Scenario: Monitors 3.3V PCIe interface rail, 2.5V memory controller rail, and adjustable 1.2V core rail in a motherboard power tree. IC Role / Device Role / Timing Role: Triple-supply supervisor providing synchronized RST assertion only after all rails stabilize for ≥200ms; PFO warns CPU of impending AC loss. Use Value: Prevents boot corruption by enforcing strict voltage-valid window before release; PFO-driven NMI initiates graceful OS shutdown before brownout.	Use Scenario: Supervises 3.3V microcontroller domain, 2.5V analog sensor interface, and adjustable 5V isolated I/O supply in a DIN-rail mounted PLC. IC Role / Device Role / Timing Role: Ensures deterministic startup of safety-critical firmware; PFI monitors 24V DC input via resistor divider to detect upstream power interruption. Use Value: Eliminates need for discrete reset ICs and external comparators; latch mode enables field calibration of undervoltage trip points without hardware change.
Network Server Baseboard Management	Automotive Infotainment Power Domain
Use Scenario: Validates 3.3V BMC communication rail, 2.5V FPGA configuration rail, and adjustable 1.8V DDR termination rail in a server baseboard. IC Role / Device Role / Timing Role: Generates system-wide RST only when all domains meet voltage and timing requirements; PFO signals IPMI controller of PSU degradation. Use Value: Reduces BOM count and layout area vs. multiple discrete supervisors; 200ms internal timeout simplifies timing design versus RC-based solutions.	Use Scenario: Monitors 3.3V MCU core, 2.5V display driver, and adjustable 5V USB-C PD rail in a head unit with cold-cranking support. IC Role / Device Role / Timing Role: Maintains RST assertion during engine cranking (9V–16V battery dip); PFI tracks battery voltage to trigger safe audio fade-out before shutdown. Use Value: Guarantees operation down to 0.5V V_CC, enabling robust reset behavior during deep brownouts common in automotive environments.

Desktop Computer Power Sequencing

Industrial PLC I/O Module Supervision

Use Scenario: Monitors 3.3V PCIe interface rail, 2.5V memory controller rail, and adjustable 1.2V core rail in a motherboard power tree.

IC Role / Device Role / Timing Role: Triple-supply supervisor providing synchronized RST assertion only after all rails stabilize for ≥200ms; PFO warns CPU of impending AC loss.

Use Value: Prevents boot corruption by enforcing strict voltage-valid window before release; PFO-driven NMI initiates graceful OS shutdown before brownout.

Use Scenario: Supervises 3.3V microcontroller domain, 2.5V analog sensor interface, and adjustable 5V isolated I/O supply in a DIN-rail mounted PLC.

IC Role / Device Role / Timing Role: Ensures deterministic startup of safety-critical firmware; PFI monitors 24V DC input via resistor divider to detect upstream power interruption.

Use Value: Eliminates need for discrete reset ICs and external comparators; latch mode enables field calibration of undervoltage trip points without hardware change.

Network Server Baseboard Management

Automotive Infotainment Power Domain

Use Scenario: Validates 3.3V BMC communication rail, 2.5V FPGA configuration rail, and adjustable 1.8V DDR termination rail in a server baseboard.

IC Role / Device Role / Timing Role: Generates system-wide RST only when all domains meet voltage and timing requirements; PFO signals IPMI controller of PSU degradation.

Use Value: Reduces BOM count and layout area vs. multiple discrete supervisors; 200ms internal timeout simplifies timing design versus RC-based solutions.

Use Scenario: Monitors 3.3V MCU core, 2.5V display driver, and adjustable 5V USB-C PD rail in a head unit with cold-cranking support.

IC Role / Device Role / Timing Role: Maintains RST assertion during engine cranking (9V–16V battery dip); PFI tracks battery voltage to trigger safe audio fade-out before shutdown.

Use Value: Guarantees operation down to 0.5V V_CC, enabling robust reset behavior during deep brownouts common in automotive environments.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX6326–25	Fixed 3.3V/2.5V monitoring, no ADJ input; 200ms fixed timeout; ±2.5% threshold accuracy; SOT23-6 package.	Lacks third adjustable monitor and PFI power-fail warning; suitable only for dual-rail systems without early-warning requirement.	Select when board space is extremely constrained and only two rails require supervision; not suitable for designs needing PFO or ADJ flexibility.
TPS3808G33	Single 3.3V supervisor; no V2/ADJ/PFI; adjustable timeout (1ms–10s); ±0.5% threshold accuracy; SOT23-6.	Cannot monitor multiple rails simultaneously; lacks power-fail comparator; requires additional ICs for multi-rail coverage.	Choose only for simple 3.3V-only systems where highest threshold accuracy is critical and cost-per-rail is prioritized over integration.

Compared with MAX6326–25 and TPS3808G33, the LTC2911CDDB-2 delivers unique triple-rail supervision with configurable PFI warning and latch-mode margin testing - reducing component count and enabling robust power sequencing in compact, multi-voltage systems where reliability and diagnostic capability are essential.

Availability

LTC2911CDDB-2 is available at Aetrix Electronics and suitable for desktop computer motherboards, industrial PLC modules, network server baseboards, and automotive infotainment systems requiring stable component supply and long-term production continuity.

Supply support for LTC2911CDDB-2 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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and computing markets.

The LTC2911 family was designed specifically for precision multi-rail power monitoring in high-reliability computing and industrial systems, emphasizing threshold accuracy, low quiescent current, and diagnostic features like PFO and TMR latch.

FAQ

What is the exact reset threshold voltage for V1 and V2 on the LTC2911CDDB-2?

The LTC2911CDDB-2 has a V1 reset threshold of 3.086V (3.3V − 6.5%) and a V2 reset threshold of 2.338V (2.5V − 6.5%), both guaranteed within ±1.5% over the full 0°C to 70°C operating range. These values are fixed per the -2 variant and do not require external configuration. The LTC2911CDDB-2 datasheet specifies VRT33 = 3.036V to 3.135V and VRT25 = 2.300V to 2.375V as the min/max bounds.

Can the LTC2911CDDB-2 monitor a 1.2V supply as its third input?

Yes, the LTC2911CDDB-2 can monitor a 1.2V supply using the ADJ pin with an external resistor divider. The ADJ input has a fixed 500mV threshold, so a divider with R1 = 100kΩ and R2 = 140kΩ (standard 1%) sets the trip point at approximately 1.2V. The LTC2911CDDB-2's ±1.5% ADJ threshold accuracy and low input bias current (<40nA) ensure stable operation with such configurations.

How does the PFI input on the LTC2911CDDB-2 differ from the ADJ input?

The PFI input on the LTC2911CDDB-2 is dedicated to power-fail detection with a 500mV falling-edge threshold and 15mV hysteresis, optimized for early warning of supply collapse. The ADJ input is a general-purpose 0.5V threshold comparator for configuring a third supply monitor. While both accept resistive dividers, PFI includes built-in hysteresis and propagation delay filtering (8–80µs) not present on ADJ, making it unsuitable for precise rail monitoring but ideal for predictive failure signaling.

What happens to the RST output of the LTC2911CDDB-2 when V1 drops to 0.5V during power-down?

The LTC2911CDDB-2 guarantees RST output functionality down to V_CC = 0.5V, and since V_CC is derived from the higher of V1 or V2, RST remains asserted low (valid logic state) even as V1 collapses to 0.5V. This ensures deterministic reset behavior during deep brownouts. The LTC2911CDDB-2's proprietary low-voltage drive circuitry maintains output integrity far below typical supervisor operating limits.

Is the LTC2911CDDB-2 pin-compatible with other variants like LTC2911CDDB-3 or LTC2911CDDB-5?

No, the LTC2911CDDB-2 is not pin-compatible with LTC2911CDDB-3 or LTC2911CDDB-5 in terms of V2 functionality. While all share identical DFN-8 pinout and power/ground connections, the V2 pin behavior differs: LTC2911CDDB-2 monitors 2.5V, LTC2911CDDB-3 monitors 1.8V, and LTC2911CDDB-5 configures V2 as a second adjustable input. Swapping variants without updating the schematic will result in incorrect V2 threshold interpretation and potential system malfunction.

LTC2911CDDB-2 Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc.

Series:: -

Package/Case:: 8-WFDFN Exposed Pad

Packaging:: Tube

Product Status:: Obsolete

Programmable:: Not Verified

Type:: Multi-Voltage Supervisor

Number of Voltages Monitored:: 3

Voltage - Threshold:: 2.338V, 3.086V, Adj

Output:: Push-Pull, Totem Pole

Reset:: Active Low

Reset Timeout:: Adjustable/Selectable

Operating Temperature:: 0°C ~ 70°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-DFN (3x2)

LTC2911CDDB-2 FAQ

1.How can I place an order for LTC2911CDDB-2 through Aetrix?

Please submit a Request for Quotation (RFQ) for LTC2911CDDB-2 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for LTC2911CDDB-2 reliable?

The price and inventory of LTC2911CDDB-2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2911CDDB-2 is usually 5 days.

3.What payment methods are accepted for LTC2911CDDB-2?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2911CDDB-2 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LTC2911CDDB-2?

LTC2911CDDB-2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LTC2911CDDB-2 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for LTC2911CDDB-2?

For technical support, including LTC2911CDDB-2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2911CDDB-2 requirements.

6.How does Aetrix verify that LTC2911CDDB-2 is sourced from the original manufacturer or authorized distributors?

All LTC2911CDDB-2 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LTC2911CDDB-2 meets industry standards.

7.What is the process for return or replacement of LTC2911CDDB-2?

All LTC2911CDDB-2 units undergo pre-shipment inspection (PSI). If there is an issue with LTC2911CDDB-2, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The LTC2911CDDB-2 part is unused and in its original packaging.

Return procedure for LTC2911CDDB-2:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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