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Analog Devices Inc. LTC2911CDDB-2#TRMPBF
- Part No.:
- LTC2911CDDB-2#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC2911CDDB-2#TRMPBF.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,730
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Product details
Overview
LTC2911CDDB-2#TRMPBF 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 VCC for reliable power-up sequencing in embedded power management systems.
For engineers reviewing the LTC2911CDDB-2#TRMPBF datasheet, LTC2911CDDB-2#TRMPBF pinout, LTC2911CDDB-2#TRMPBF application, or LTC2911CDDB-2#TRMPBF equivalent, this page delivers verified specifications, validated DFN-8 pin functions, confirmed 2.5V/3.3V dual-supply monitoring capability, and real-world margin testing and early-warning power-fail use cases - all grounded in the official LTC2911-2 product documentation.
Technical Context
The LTC2911CDDB-2#TRMPBF implements three independent voltage comparators: one fixed 3.3V monitor (V1), one fixed 2.5V monitor (V2), and one adjustable 0.5V-threshold input (ADJ) for custom supply tracking via resistive divider. Its internal VCC is derived from the higher of V1 or V2, enabling operation even when one rail is absent.
A dedicated PFI/PFO path provides programmable power-fail detection with 500mV falling-edge threshold and 15mV hysteresis, while the TMR pin enables three modes: external capacitor timeout, internal 200ms timeout (TMR = V1), or RST latch (TMR = GND) - critical for system margin testing and controlled shutdown sequences.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| V1 Threshold | 3.086 V (–6.5% of 3.3V); guarantees reset assertion before 3.3V supply falls below system operational minimum |
| V2 Threshold | 2.338 V (–6.5% of 2.5V); tight ±1.5% accuracy over full 0°C–70°C range ensures no false resets under temperature drift |
| ADJ Threshold | 500 mV nominal; enables precise trip point configuration for third supply using external resistor divider |
| Reset Timeout | 200 ms internal (TMR tied to V1); eliminates need for external timing capacitor in space-constrained designs |
| Supply Current | 30 µA typical; ultra-low quiescent draw minimizes impact on battery-backed or energy-sensitive systems |
| PFO Propagation Delay | 8–80 µs; fast response enables timely early-warning signaling before main supply collapse |
| Operating Temp | 0°C to 70°C (C-grade); validated for commercial computing, network, and industrial control environments |
Pinout & Package
Package: 8-lead (3mm × 2mm) plastic DFN (DDB) with exposed pad (Pin 9, GND). Compact footprint suits high-density PCB layouts; thermal resistance θJA = 76°C/W enables stable operation without heatsinking in typical ambient conditions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P1 (PFI) | Power-fail input | Accepts resistive divider output; triggers PFO low at 500 mV falling edge for early warning of primary supply collapse |
| P2 (ADJ) | Adjustable monitor input | 0.5 V threshold reference; used with external divider to monitor third supply (e.g., 1.0V core, 1.8V I/O) |
| P3 (TMR) | Reset timeout/latch control | Tied to V1 → 200 ms internal timeout; pulled to GND → latches RST state for margin testing |
| P4 (GND) | Device ground | Reference for all analog comparators and digital outputs; exposed pad must be connected to PCB ground plane |
| P5 (RST) | Reset logic output | Open-drain, weak pull-up to V1; asserts low if any monitored supply (V1/V2/ADJ) drops below threshold |
| P6 (PFO) | Power-fail logic output | Open-drain, weak pull-up to V1; asserts low when PFI falls below 500 mV - signals imminent power loss |
| P7 (V1) | 3.3V supply monitor & power source | Monitors 3.3V rail at –6.5% threshold; also supplies internal VCC and RST/PFO pull-up current |
| P8 (V2) | 2.5V supply monitor & power source | Monitors 2.5V rail at –6.5% threshold; contributes to internal VCC generation alongside V1 |
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 full 0°C–70°C range reduces design margin requirements and prevents nuisance resets during thermal cycling |
| Programmable power-fail warning | PFI/PFO path with 500 mV threshold and 15 mV hysteresis allows configurable early-warning window ahead of main supply failure |
| Reset latch mode | TMR pin pull-down freezes RST state, enabling safe voltage margining tests without unintended system resets |
| Ultralow VCC operation | RST and PFO remain functional down to 0.5 V VCC, ensuring deterministic behavior during brown-out and power-up sequencing |
Applications
| Network Server Power Management | Industrial PLC I/O Module |
|---|---|
Use Scenario: Monitors 3.3V CPU core, 2.5V memory interface, and 1.2V FPGA auxiliary rail in a 1U rack server. IC Role / Device Role / Timing Role: Triple-supply supervisor providing synchronized reset assertion and PFO-driven graceful shutdown initiation. Use Value: Prevents data corruption by triggering nonvolatile storage write before 3.3V rail collapses, leveraging 200ms internal timeout and 8µs PFO response. |
Use Scenario: Supervises 3.3V controller logic, 2.5V analog sensor interface, and adjustable 1.8V isolated communication rail in a DIN-rail mounted PLC. IC Role / Device Role / Timing Role: Fault-tolerant voltage monitor with latch-enabled margin testing for field-deployed reliability validation. Use Value: Enables in-situ voltage stress testing via TMR latch without disrupting running control loops - critical for SIL2-certified industrial firmware validation. |
| Automotive Infotainment Head Unit | Medical Diagnostic Imaging Subsystem |
Use Scenario: Tracks 3.3V MCU domain, 2.5V display driver, and ADJ-configured 5.0V USB-C PD rail in a vehicle head unit with cold-crank immunity. IC Role / Device Role / Timing Role: Automotive-grade (–40°C to 125°C capable variant) supply monitor with glitch-immune comparators for noisy 12V battery environments. Use Value: 1.5% threshold accuracy avoids false resets during engine cranking transients; PFO warns MCU 200ms before V1 collapse to save UI state. |
Use Scenario: Ensures clean power sequencing for FPGA-based image reconstruction engine powered by 3.3V, 2.5V, and ADJ-set 1.0V rails in MRI subsystem. IC Role / Device Role / Timing Role: High-reliability triple-supply monitor with latched RST for diagnostic self-test mode activation. Use Value: TMR latch holds RST low during calibration voltage sweeps, preventing spurious reboots while maintaining FDA-compliant fault logging integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6369KA+T | Fixed 3.3V/2.5V/1.8V thresholds; no ADJ input; 140ms fixed timeout; ±2.5% threshold accuracy | Lacks adjustable third monitor and programmable PFI; suitable only for static 1.8V third-rail systems | Select when third rail is always 1.8V and design prioritizes cost over flexibility |
| TPS3808G33DBVR | Single 3.3V monitor; no V2 or ADJ inputs; 200ms timeout; ±0.5% accuracy; requires external circuitry for triple-rail support | Cannot monitor 2.5V or adjustable rail natively; needs two additional ICs or discrete comparators | Select only for 3.3V-only supervision where board area and BOM count are secondary to ultra-high accuracy |
Compared with MAX6369KA+T and TPS3808G33DBVR, the LTC2911CDDB-2#TRMPBF uniquely integrates true triple-rail monitoring with adjustable threshold, programmable PFI, and latch-mode margin testing in a single DFN-8 package - eliminating external components and reducing validation effort for multi-voltage systems.
Availability
LTC2911CDDB-2#TRMPBF is available at Aetrix Electronics and suitable for network servers, industrial PLCs, and automotive infotainment systems requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
Supply support for LTC2911CDDB-2#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, communications, and industrial markets.
The LTC2911 family was designed specifically for high-accuracy, low-power multi-rail supply monitoring in space-constrained computing and embedded systems - emphasizing ±1.5% threshold stability, ultralow VCC operation, and integrated power-fail warning.
FAQ
What is the exact V2 monitoring threshold for LTC2911CDDB-2#TRMPBF?
The LTC2911CDDB-2#TRMPBF is the -2 variant, which monitors V2 at 2.5V with a guaranteed –6.5% threshold of 2.338V (±1.5% over 0°C–70°C). This value is fixed in silicon and does not require external resistor programming - unlike the ADJ input, which uses a 0.5V internal reference for custom trip points.
Does LTC2911CDDB-2#TRMPBF support internal reset timeout without external components?
Yes. The LTC2911CDDB-2#TRMPBF supports an internal 200ms reset timeout when the TMR pin is tied directly to V1. This eliminates the need for an external timing capacitor, simplifying layout and improving reliability in high-vibration or high-temperature environments where capacitor aging could affect timing accuracy.
Can LTC2911CDDB-2#TRMPBF monitor a 1.2V supply as the third rail?
No - the LTC2911CDDB-2#TRMPBF fixes V2 to 2.5V monitoring and uses the ADJ pin for the third rail. To monitor 1.2V, configure a resistive divider between the 1.2V supply and GND such that the ADJ pin sees 0.5V at the desired trip point (e.g., R1=100kΩ, R2=140kΩ yields ~1.2V trip). The ADJ input's ±15nA bias current ensures minimal error.
How does the PFO output function in LTC2911CDDB-2#TRMPBF?
The PFO output in LTC2911CDDB-2#TRMPBF is an open-drain signal that pulls low when the PFI input falls below 500mV (with 15mV hysteresis), providing early warning of primary supply collapse. It features a weak internal pull-up to V1 (~29µA at 3.3V), but external pull-up resistors can raise its high-level voltage beyond V1 for interfacing with higher-voltage logic.
Is the exposed pad on the DFN package of LTC2911CDDB-2#TRMPBF required to connect to GND?
Yes - the exposed pad (Pin 9) on the LTC2911CDDB-2#TRMPBF DFN package is internally connected to GND and must be soldered to the PCB ground plane. This connection is essential for thermal performance (θJA = 76°C/W) and electrical noise immunity; leaving it unconnected degrades both thermal dissipation and comparator stability under transient load conditions.
LTC2911CDDB-2#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:
- 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#TRMPBF FAQ
1.How can I place an order for LTC2911CDDB-2#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2911CDDB-2#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-2#TRMPBF reliable?
The price and inventory of LTC2911CDDB-2#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-2#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC2911CDDB-2#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2911CDDB-2#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2911CDDB-2#TRMPBF?
LTC2911CDDB-2#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2911CDDB-2#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-2#TRMPBF?
For technical support, including LTC2911CDDB-2#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2911CDDB-2#TRMPBF requirements.
6.How does Aetrix verify that LTC2911CDDB-2#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC2911CDDB-2#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-2#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC2911CDDB-2#TRMPBF?
All LTC2911CDDB-2#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2911CDDB-2#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-2#TRMPBF part is unused and in its original packaging.
Return procedure for LTC2911CDDB-2#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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