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Analog Devices Inc. LTC2911CDDB-3#TRMPBF
- Part No.:
- LTC2911CDDB-3#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC2911CDDB-3#TRMPBF.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,191
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Product details
Overview
LTC2911CDDB-3#TRMPBF from Analog Devices (formerly Linear Technology) is a precision triple supply monitor IC with integrated power-fail comparator and latched reset control. It monitors 3.3V (V1), 1.8V (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 VCC for reliable power-up sequencing in embedded computing systems.
For engineers reviewing the LTC2911CDDB-3#TRMPBF datasheet, LTC2911CDDB-3#TRMPBF pinout, LTC2911CDDB-3#TRMPBF application, or LTC2911CDDB-3#TRMPBF equivalent, this page delivers verified functional identity, DFN-8 package mapping, confirmed 8-pin terminal roles, real-world margin testing use cases, and two validated alternative parts with documented technical and application differences.
Technical Context
The LTC2911CDDB-3#TRMPBF implements three independent voltage comparators - one fixed 3.086V threshold on V1, one fixed 1.683V threshold on V2 (per -3 variant), and one 500mV nominal threshold on ADJ - all with tight ±1.5% accuracy across temperature. Its PFI/PFO path provides early power-fail warning via configurable resistive divider with 15mV hysteresis.
Reset assertion is synchronized to V1/V2/ADJ undervoltage detection with 8–80µs propagation delay; timeout is selectable via TMR pin (internal 200ms or external capacitor). The RST output features weak internal pull-up to V1 and latch capability via TMR pin grounding, enabling controlled margin testing without system reset.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| V1 Threshold | 3.086V ±1.5% - precisely monitors 3.3V supply at –6.5% tolerance, preventing false resets within 5% supply band |
| V2 Threshold | 1.683V ±1.5% - factory-set for 1.8V supply monitoring per LTC2911-3 variant identification |
| ADJ Threshold | 500mV ±1.5% - enables third supply monitoring via resistive divider; supports custom trip points |
| PFI Threshold | 500mV falling / 515mV rising - provides 3% hysteresis for noise-immune early power-fail detection |
| Quiescent Current | 30µA typical - ultra-low power operation extends battery life in always-on monitoring applications |
| Reset Timeout | 200ms internal (TMR = V1) or 15–27ms external (CTMR = 2.2nF) - eliminates need for external RC timing components |
| Operating Temp | 0°C to 70°C - commercial-grade thermal range suitable for desktop, networking, and industrial control environments |
Pinout & Package
Package: 8-lead (3mm × 2mm) plastic DFN with exposed pad (Pin 9, GND). RoHS-compliant, lead-free finish (PBF), 500-piece tape-and-reel (#TRMPBF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PFI | Power-fail input | Accepts resistive-divider-scaled voltage; triggers PFO low when falling below 500mV (±1.5%) |
| ADJ | Adjustable monitor input | Third comparator input with 500mV threshold; enables custom supply monitoring via external divider |
| TMR | Reset timeout/latch control | Set to V1 for 200ms internal timeout; pulled to GND to latch RST state during margin testing |
| GND | Device ground reference | Reference for all comparators and outputs; exposed pad must be connected to PCB ground plane |
| V2 | 1.8V supply monitor input | Fixed 1.683V threshold (–6.5%) for 1.8V rail; high-impedance input draws ≤30µA |
| V1 | 3.3V supply monitor & power source | Fixed 3.086V threshold; supplies internal VCC and RST/PFO pull-up current |
| PFO | Power-fail logic output | Open-drain output pulled low on PFI undervoltage; provides early warning for controlled shutdown |
| RST | Reset logic output | Open-drain reset signal asserted low if any monitored supply falls below threshold; latched via TMR |
Key Features
| Feature | Design Value |
|---|---|
| Triple simultaneous monitoring | Monitors 3.3V, 1.8V, and adjustable supply independently with guaranteed ±1.5% threshold accuracy over full temp range |
| Power-fail early warning | PFO asserts before RST during brownout, enabling processor NMI-driven shutdown sequence prior to system reset |
| Latched reset for margin testing | TMR pin grounding holds RST state indefinitely, allowing stable under-voltage validation without spurious resets |
| Ultralow operating voltage | RST and PFO remain functional down to VCC = 0.5V, ensuring deterministic behavior during power ramp-up |
| Glitch-immune comparators | Input filtering rejects transients <8µs at 10% overdrive, eliminating false trips from switching noise or ESD |
Applications
| Desktop Power Sequencing | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Coordinating startup of CPU core, memory, and peripheral rails in x86-based workstations. IC Role / Device Role / Timing Role: Triple monitor ensures 3.3V, 1.8V, and auxiliary supply meet thresholds before releasing RST to enable boot ROM access. Use Value: Prevents firmware corruption by guaranteeing all critical rails are stable for ≥200ms before processor release. |
Use Scenario: Monitoring isolated 3.3V logic, 1.8V FPGA I/O, and field-side 24V-to-5V converter output in programmable logic controllers. IC Role / Device Role / Timing Role: ADJ input configured for 5V rail via resistor divider; PFI monitors main 24V input for predictive failure signaling. Use Value: PFO interrupt initiates safe I/O state freeze and nonvolatile storage before 24V collapse causes RST assertion. |
| Network Switch ASIC Power Management | Automotive Infotainment Head Unit |
|
Use Scenario: Ensuring clean power-up of multi-rail switch fabric ASICs with strict sequencing requirements. IC Role / Device Role / Timing Role: V1 monitors 3.3V management rail; V2 monitors 1.8V SerDes supply; ADJ monitors 1.0V core via divider. Use Value: Internal 200ms timeout eliminates external timing components, reducing BOM count and layout area. |
Use Scenario: Validating dual 3.3V (infotainment MCU) and 1.8V (audio codec) supplies in automotive head units with extended temperature requirements. IC Role / Device Role / Timing Role: LTC2911CDDB-3#TRMPBF used in commercial-grade subsystem; PFI tied to 12V battery via divider for low-battery warning. Use Value: ±1.5% threshold accuracy allows tighter supply margins versus ±2.5% alternatives, improving system reliability at cold cranking voltages. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6316HUT46D3+T | Fixed 4.63V V2 threshold; no ADJ input; 1.6% threshold accuracy; 140ms min timeout | Lacks third adjustable monitor; suited only for dual-supply + power-fail use cases | Select when only 3.3V + 4.63V monitoring needed and ADJ functionality is unnecessary |
| TPS3808G33DBVR | Single 3.3V monitor; no V2/ADJ inputs; 0.5% accuracy; 200ms fixed timeout; SOT-23-6 | Monitors only one supply; requires additional ICs for triple monitoring | Choose for cost-sensitive single-rail designs where footprint and simplicity outweigh multi-rail capability |
Compared with MAX6316HUT46D3+T and TPS3808G33DBVR, the LTC2911CDDB-3#TRMPBF uniquely integrates three independent monitors-including factory-configured 1.8V tracking-within a single DFN-8 package, enabling compact, accurate, and self-contained power sequencing without external dividers or multiple ICs.
Availability
LTC2911CDDB-3#TRMPBF is available at Aetrix Electronics and suitable for desktop computing, industrial PLCs, network switches, and automotive infotainment systems requiring stable component supply, long-term lifecycle support, and guaranteed commercial-temperature performance.
Supply support for LTC2911CDDB-3#TRMPBF 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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving precision instrumentation, communications, and industrial markets.
The LTC2911 family was designed specifically for high-accuracy, low-power supply monitoring in space-constrained embedded systems - emphasizing ±1.5% threshold stability, ultralow VCC operation, and flexible reset timing without external components.
FAQ
What is the exact V2 threshold voltage for LTC2911CDDB-3#TRMPBF?
The LTC2911CDDB-3#TRMPBF is the LTC2911-3 variant, with a factory-trimmed V2 threshold of 1.683V ±1.5% (i.e., 1.656V to 1.710V) over 0°C to 70°C. This corresponds to a –6.5% undervoltage monitor for a nominal 1.8V supply, as confirmed in the Electrical Characteristics table (VRT18 parameter) and Product Selection Guide.
Does LTC2911CDDB-3#TRMPBF support external reset timeout configuration?
Yes, LTC2911CDDB-3#TRMPBF supports both internal and external timeout modes. Connecting the TMR pin to V1 enables the fixed 200ms internal timeout. For adjustable timing, connect a capacitor (e.g., 2.2nF) between TMR and GND to achieve ~20ms; timeout scales at 9.4ms/nF, as specified in the Pin Functions section and Typical Performance Characteristics.
How does the latch feature on LTC2911CDDB-3#TRMPBF work during margin testing?
The LTC2911CDDB-3#TRMPBF latches RST state when the TMR pin is pulled to GND. If RST is high before latching, it remains high after TMR release - even if monitored supplies dip - provided all inputs are valid at release time. If RST is low before latching, it stays low until all inputs exceed thresholds for the full timeout period post-release, enabling precise under-voltage stress validation.
Can LTC2911CDDB-3#TRMPBF monitor a 5V supply on the V2 pin?
No - LTC2911CDDB-3#TRMPBF is the -3 variant, factory-configured exclusively for 1.8V monitoring on V2 (1.683V threshold). To monitor 5V, select the LTC2911CDDB-1#TRMPBF (-1 variant), which has a 4.675V V2 threshold. Mixing variants invalidates the specified V2 accuracy and electrical characteristics.
What is the maximum supply voltage the PFI pin can tolerate on LTC2911CDDB-3#TRMPBF?
The PFI pin on LTC2911CDDB-3#TRMPBF has an absolute maximum rating of –0.3V to 2V, as stated in the Absolute Maximum Ratings table. Exceeding 2V risks permanent damage. For monitoring supplies >2V (e.g., 12V battery), a resistive divider must scale the voltage to ≤2V at PFI while maintaining ≥500mV threshold resolution.
LTC2911CDDB-3#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 1.683V, 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-3#TRMPBF FAQ
1.How can I place an order for LTC2911CDDB-3#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2911CDDB-3#TRMPBF 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-3#TRMPBF reliable?
The price and inventory of LTC2911CDDB-3#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2911CDDB-3#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC2911CDDB-3#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2911CDDB-3#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2911CDDB-3#TRMPBF?
LTC2911CDDB-3#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2911CDDB-3#TRMPBF 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-3#TRMPBF?
For technical support, including LTC2911CDDB-3#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2911CDDB-3#TRMPBF requirements.
6.How does Aetrix verify that LTC2911CDDB-3#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC2911CDDB-3#TRMPBF 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-3#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC2911CDDB-3#TRMPBF?
All LTC2911CDDB-3#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2911CDDB-3#TRMPBF, 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-3#TRMPBF part is unused and in its original packaging.
Return procedure for LTC2911CDDB-3#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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