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Analog Devices Inc. LTC2911HDDB-2#TRPBF
- Part No.:
- LTC2911HDDB-2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC2911HDDB-2#TRPBF.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,656
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Product details
Overview
LTC2911HDDB-2#TRPBF from Analog Devices (formerly Linear Technology) is a precision triple supply monitor IC with integrated power-fail comparator and latchable reset output. It monitors 3.3V (V1), 2.5V (V2), and an adjustable input (ADJ) with ±1.5% threshold accuracy over –40°C to +125°C, supports internal 200ms reset timeout, and operates down to 0.5V VCC for reliable power-up sequencing in automotive engine control units.
For engineers reviewing the LTC2911HDDB-2#TRPBF datasheet, LTC2911HDDB-2#TRPBF pinout, LTC2911HDDB-2#TRPBF application, or LTC2911HDDB-2#TRPBF equivalent, key selection criteria include its H-grade automotive temperature range, DFN-8 (3mm × 2mm) package, 30µA quiescent current, PFI-based early-warning capability, and latched RST functionality for margin testing.
Technical Context
The LTC2911HDDB-2#TRPBF implements three independent voltage comparators - one fixed at 3.086V (V1), one fixed at 2.338V (V2), and one adjustable via external resistor divider on ADJ with 500mV nominal threshold. All comparators feature 1.5% accuracy across full temperature range and built-in glitch filtering for noise immunity.
Its power-fail comparator uses PFI input with 500mV falling / 515mV rising thresholds (3% hysteresis) to drive PFO low for early warning; TMR pin enables internal 200ms timeout (when tied to V1) or latch mode (when pulled to GND), allowing controlled reset assertion during system validation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| V1 Threshold | 3.086V ±1.5% - guarantees reliable 3.3V supply monitoring across automotive temperature range |
| V2 Threshold | 2.338V ±1.5% - precisely tracks 2.5V rail with –6.5% trip point to avoid false resets within 5% supply tolerance |
| ADJ Threshold | 500mV ±1.5% - enables configurable third supply monitoring using external resistive divider |
| PFI Threshold | 500mV falling / 515mV rising - provides noise-immune early-warning detection of primary supply collapse |
| Reset Timeout | 200ms internal (TMR = V1) - eliminates external capacitor while ensuring sufficient hold time for processor initialization |
| Quiescent Current | 30µA typical - minimizes parasitic load on monitored supplies in always-on automotive subsystems |
| Operating Temp | –40°C to +125°C - qualified for under-hood engine control, transmission, and ADAS modules |
Pinout & Package
Package: 8-Lead (3mm × 2mm) Plastic DFN with exposed pad (pin 9), θJA = 76°C/W, RoHS-compliant lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (PFI) | Power-fail input | Monitors primary supply via resistive divider; triggers PFO low at 500mV falling edge for early shutdown signaling |
| 2 (ADJ) | Adjustable monitor input | Configurable third supply threshold (e.g., 1.0V, 1.5V) using external divider; 500mV comparator reference |
| 3 (TMR) | Reset timeout/latch control | Tied to V1 → 200ms internal timeout; pulled to GND → latches RST state for margin testing |
| 4 (GND) | Device ground | Reference for all analog comparators and digital outputs; exposed pad must be connected to PCB ground plane |
| 5 (RST) | Reset logic output | Open-drain active-low output pulled up to V1; asserts low if any monitored supply falls below threshold |
| 6 (PFO) | Power-fail logic output | Open-drain active-low output pulled up to V1; signals imminent supply failure before RST asserts |
| 7 (V1) | 3.3V monitor & supply input | Primary 3.3V rail monitor (3.086V threshold); powers internal circuitry when V1 ≥ V2 |
| 8 (V2) | 2.5V monitor & supply input | Secondary 2.5V rail monitor (2.338V threshold); contributes to internal VCC generation in non-LTC2911-5 variants |
Key Features
| Feature | Design Value |
|---|---|
| Triple simultaneous monitoring | Simultaneously validates 3.3V, 2.5V, and user-configurable supply - eliminates need for multiple discrete supervisors |
| ±1.5% threshold accuracy | Reduces required system voltage margin by >2% vs. ±2.5% parts, enabling tighter supply design and lower BOM cost |
| Power-fail early warning | PFO output asserts before RST, enabling controlled firmware shutdown (e.g., NVM save, sequenced power-down) without system crash |
| Latchable RST output | TMR pin pull-to-ground freezes RST state - simplifies production margin testing without modifying power rails |
| 0.5V guaranteed operation | RST/PFO remain functional down to VCC = 0.5V - prevents indeterminate logic states during brown-out recovery |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC I/O Module |
|---|---|
Use Scenario: Monitors 3.3V microcontroller core, 2.5V sensor interface, and 5V CAN transceiver supply in under-hood ECU. IC Role / Device Role / Timing Role: Triple-supply supervisor with PFO-driven NMI interrupt for pre-failure shutdown before main reset. Use Value: Prevents EEPROM corruption during battery voltage sag by initiating graceful shutdown 20–50ms before RST assertion. | Use Scenario: Validates isolated 3.3V logic, 2.5V ADC reference, and field-side 24V-to-5V DC/DC output in modular PLC backplane. IC Role / Device Role / Timing Role: Fault-tolerant supply monitor with latch mode for factory calibration verification at reduced voltages. Use Value: Enables margin testing at 90% nominal voltage without triggering system reset, reducing test cycle time by 35%. |
| Medical Infusion Pump Controller | Avionics Power Management Unit |
Use Scenario: Ensures integrity of 3.3V MCU, 2.5V DAC, and battery-backed 3.0V RTC supply in Class II medical device. IC Role / Device Role / Timing Role: Safety-critical triple-monitor with ±1.5% accuracy meeting IEC 62304 SOUP requirements. Use Value: Eliminates need for redundant supervision by guaranteeing trip point repeatability across lifetime thermal cycling. | Use Scenario: Supervises 3.3V flight computer, 2.5V inertial sensor, and adjustable 1.8V FPGA bank in DO-160 Zone 3 environment. IC Role / Device Role / Timing Role: High-reliability supply monitor with H-grade temp range and DFN package for vibration resistance. Use Value: Reduces board area by 40% vs. discrete dual-supervisor solution while maintaining MIL-STD-704 compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6369AUT+T | Fixed 3.08V/2.63V thresholds; no adjustable ADJ input; 140ms fixed timeout; SOT23-6 package | Lacks third adjustable monitor and PFI early-warning; suitable only for dual-rail systems without margin testing needs | Select when board space is critical and only two supplies require monitoring with no latch requirement |
| TPS3808G33DBVR | Single 3.3V monitor; no V2/ADJ inputs; 200ms timeout; 30µA IQ; SOT23-6 | Cannot monitor 2.5V or adjustable rail; requires additional ICs for triple monitoring; no PFI function | Choose only for cost-sensitive single-rail applications where multi-supply supervision is handled externally |
Compared with MAX6369AUT+T and TPS3808G33DBVR, the LTC2911HDDB-2#TRPBF uniquely integrates triple monitoring, PFI early-warning, and latchable RST in a single automotive-grade DFN package - eliminating component count, interconnect complexity, and timing coordination overhead in safety-critical systems.
Availability
LTC2911HDDB-2#TRPBF is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC modules, medical infusion pump controllers, and avionics power management units requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC2911HDDB-2#TRPBF 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 for precision instrumentation, industrial automation, and automotive electronics.
The LTC2911 product line delivers ultra-accurate, low-power supply monitoring ICs specifically engineered for mission-critical automotive, medical, and industrial systems demanding ±1.5% threshold stability across –40°C to +125°C.
FAQ
What is the exact reset threshold voltage for V1 and V2 on the LTC2911HDDB-2#TRPBF?
The LTC2911HDDB-2#TRPBF 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 –40°C to +125°C operating range. These values are specified in the Electrical Characteristics table of the official datasheet and confirmed by production test limits for the H-grade variant.
Does the LTC2911HDDB-2#TRPBF support adjustable timeout periods, or is it fixed at 200ms?
The LTC2911HDDB-2#TRPBF supports both modes: tying the TMR pin to V1 selects the internal 200ms timeout, while connecting an external capacitor (CTMR) between TMR and GND enables programmable timeout (tRST ≈ CTMR × 106.5 pF/ms). The minimum external timeout is ~15ms with 2.2nF; open-circuit TMR yields ~400µs.
How does the PFI input on the LTC2911HDDB-2#TRPBF differ from the ADJ input in terms of hysteresis and use case?
The PFI input has 15mV hysteresis (500mV/515mV) optimized for early-warning detection of primary supply collapse, while the ADJ input has no inherent hysteresis and is intended for precise third-supply monitoring. PFI drives PFO for pre-reset alerts; ADJ drives RST only when its threshold is violated - making them functionally distinct despite shared 500mV nominal reference.
Can the LTC2911HDDB-2#TRPBF monitor a 1.8V supply on the V2 pin?
No - the LTC2911HDDB-2#TRPBF is the -2 variant, configured specifically for 3.3V (V1) and 2.5V (V2) monitoring. To monitor 1.8V on V2, the correct part is LTC2911HDDB-3#TRPBF. Using the wrong variant will result in incorrect trip point (2.338V instead of 1.683V), causing premature or failed reset assertion.
What is the maximum allowable leakage current for the external capacitor on the TMR pin of the LTC2911HDDB-2#TRPBF?
The external capacitor on the TMR pin of the LTC2911HDDB-2#TRPBF must exhibit ≤500nA leakage current to maintain timer accuracy. Ceramic capacitors (X7R, C0G) are recommended; electrolytic or high-leakage film types will cause significant timeout drift or failure to assert reset.
LTC2911HDDB-2#TRPBF 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:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x2)
LTC2911HDDB-2#TRPBF FAQ
1.How can I place an order for LTC2911HDDB-2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2911HDDB-2#TRPBF 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 LTC2911HDDB-2#TRPBF reliable?
The price and inventory of LTC2911HDDB-2#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2911HDDB-2#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2911HDDB-2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2911HDDB-2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2911HDDB-2#TRPBF?
LTC2911HDDB-2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2911HDDB-2#TRPBF 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 LTC2911HDDB-2#TRPBF?
For technical support, including LTC2911HDDB-2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2911HDDB-2#TRPBF requirements.
6.How does Aetrix verify that LTC2911HDDB-2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2911HDDB-2#TRPBF 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 LTC2911HDDB-2#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2911HDDB-2#TRPBF?
All LTC2911HDDB-2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2911HDDB-2#TRPBF, 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 LTC2911HDDB-2#TRPBF part is unused and in its original packaging.
Return procedure for LTC2911HDDB-2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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