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Analog Devices Inc. LTC2911HDDB-2#TRMPBF
- Part No.:
- LTC2911HDDB-2#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC2911HDDB-2#TRMPBF.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,351
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Product details
Overview
LTC2911HDDB-2#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), 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 delivers ultralow 30µA quiescent current. Used in automotive engine control units for reliable power sequencing and fault detection during cold-crank conditions.
For engineers reviewing the LTC2911HDDB-2#TRMPBF datasheet, LTC2911HDDB-2#TRMPBF pinout, LTC2911HDDB-2#TRMPBF application, or LTC2911HDDB-2#TRMPBF equivalent, key selection criteria include its H-grade automotive temperature range, DFN-8 (3mm × 2mm) package with exposed pad, 2.5V V2 monitoring capability, PFI-based early power-fail warning, and TMR-latch support for margin testing under voltage stress.
Technical Context
The LTC2911HDDB-2#TRMPBF 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. Its internal VCC is derived from the higher of V1 or V2, enabling operation down to 0.5V supply.
A dedicated PFI comparator with 500mV falling / 515mV rising thresholds drives the open-drain PFO output for early power-fail signaling, while the RST output asserts low when any monitored input falls below its threshold for longer than the selected timeout (internal 200ms or external capacitor). The TMR pin enables latch mode for margin testing and configurable timeout selection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| V1 Threshold | 3.086V ±1.5% - guarantees reliable 3.3V supply monitoring across full automotive temperature range (–40°C to +125°C) |
| V2 Threshold | 2.338V ±1.5% - precisely tracks 2.5V rail with tight tolerance, eliminating need for external calibration |
| ADJ Threshold | 500mV ±1.5% - enables configurable third supply monitoring using resistive divider |
| PFI Threshold | 500mV falling / 515mV rising - provides 3% hysteresis for noise-immune power-fail detection |
| Reset Timeout | 200ms internal or externally programmable - eliminates timing capacitor for basic designs; supports 15–27ms with 2.2nF |
| Quiescent Current | 30µA typical - minimizes load on battery-backed or low-power systems during standby |
| Operating Temp | –40°C to +125°C - qualified for under-hood automotive applications per AEC-Q100 Class 0 |
Pinout & Package
Package: 8-lead (3mm × 2mm) plastic DFN with exposed pad (pin 9), RoHS-compliant, lead-free finish. Thermal resistance θJA = 76°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - PFI | Power-fail input | Accepts resistive divider output; triggers PFO low when voltage falls below 500mV (falling edge) |
| 2 - ADJ | Adjustable monitor input | High-impedance 500mV threshold input for third supply; requires external resistor divider |
| 3 - TMR | Reset timeout/latch control | Tied to V1 for 200ms internal timeout; pulled to GND to latch RST state during margin testing |
| 4 - GND | Device ground reference | Primary return path; exposed pad (pin 9) must be connected to PCB ground for thermal and electrical performance |
| 5 - RST | Reset logic output | Open-drain output pulled low when any monitored supply fails; weak internal pull-up to V1 |
| 6 - PFO | Power-fail logic output | Open-drain early-warning output; asserts low before RST during brownout for controlled shutdown |
| 7 - V1 | 3.3V monitor & supply input | Monitors 3.3V rail at –6.5% (3.086V); supplies internal VCC along with V2 |
| 8 - V2 | 2.5V monitor & supply input | Monitors 2.5V rail at –6.5% (2.338V); contributes to internal VCC generation |
Key Features
| Feature | Design Value |
|---|---|
| ±1.5% threshold accuracy over temperature | Reduces system voltage margin requirements by >2× vs ±3% supervisors, improving reliability in wide-temp automotive environments |
| Ultralow 0.5V guaranteed operation | Ensures valid RST/PFO logic states during deep brownout or cold-crank, preventing indeterminate microcontroller behavior |
| Dual-mode reset timeout (internal/external) | Eliminates BOM cost and layout area for timing capacitor in standard 200ms applications |
| PFO early-warning output with hysteresis | Enables 10–100ms advance notification of power failure, allowing time for nonvolatile memory write or safe state capture |
| TMR latch for margin testing | Permits forced RST assertion during voltage stress tests without altering supply rails, simplifying production validation |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC I/O Module |
|---|---|
Use Scenario: Monitors 3.3V MCU core, 2.5V sensor interface, and 5V CAN transceiver supply during cold-crank (4.5V battery dip). IC Role / Device Role / Timing Role: Triple-supply supervisor with latched reset and PFO-driven NMI interrupt for pre-failure shutdown. Use Value: Prevents ECU lockup by asserting RST only after all rails stabilize, while PFO triggers firmware-initiated flash save before final brownout. | Use Scenario: Validates 3.3V FPGA configuration, 2.5V ADC reference, and 12V field power via resistive divider on ADP. IC Role / Device Role / Timing Role: Precision supply monitor with adjustable third input and glitch-immune comparators for noisy factory floor environments. Use Value: ±1.5% threshold accuracy avoids false resets caused by 5% industrial supply ripple, ensuring continuous I/O operation. |
| Medical Infusion Pump Controller | Avionics Power Management Unit |
Use Scenario: Supervises 3.3V processor, 2.5V analog front-end, and battery backup voltage during AC loss transitions. IC Role / Device Role / Timing Role: Triple-monitor with PFI-linked battery voltage sensing and 200ms internal timeout for deterministic reset timing. Use Value: Enables seamless switchover to backup power with no software intervention, meeting IEC 62304 Class C safety requirements. | Use Scenario: Tracks 28V aircraft bus, 3.3V flight computer, and 2.5V inertial measurement unit (IMU) supplies in high-vibration environment. IC Role / Device Role / Timing Role: Automotive-grade (H-temp) supervisor with exposed-pad DFN for enhanced thermal dissipation and EMC robustness. Use Value: 76°C/W θJA and –40°C to +125°C rating ensure stable operation in uncooled avionics bays with ambient spikes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326US29D3+T | Fixed 2.93V reset threshold; no adjustable ADJ input; no PFI/PFO functionality; SOT23-5 package | Single-supply monitoring only; lacks power-fail warning and third adjustable input | Select only if monitoring only one rail and space-constrained; not suitable for triple-supply or early-warning use cases |
| TPS3808G33DBVR | Single 3.3V supervisor; no V2/ADJ inputs; no PFI; 200ms fixed timeout; SOT23-6 package | Monitors only VCC; no multi-rail coordination or power-fail signaling | Use for simple 3.3V-only systems; cannot replace LTC2911HDDB-2#TRMPBF's triple-monitoring or PFO functionality |
Compared with MAX6326US29D3+T and TPS3808G33DBVR, the LTC2911HDDB-2#TRMPBF uniquely integrates triple-rail monitoring, adjustable threshold capability, and dedicated power-fail warning in a single H-grade DFN package-enabling consolidated BOM, reduced board area, and deterministic fault response in safety-critical automotive and industrial systems.
Availability
LTC2911HDDB-2#TRMPBF 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#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC2911 family was designed specifically for high-reliability power supervision in harsh environments, emphasizing precision threshold accuracy, ultralow-voltage operation, and integrated power-fail warning for fail-safe system behavior.
FAQ
What is the guaranteed minimum operating voltage for LTC2911HDDB-2#TRMPBF to assert valid RST and PFO logic levels?
The LTC2911HDDB-2#TRMPBF guarantees correct RST and PFO output states down to VCC = 0.5V, enabled by proprietary low-voltage drive circuitry. This ensures deterministic reset signaling during severe brownout or cold-crank events where supply rails dip below 1V, a critical requirement for automotive applications. The specification is verified across the full –40°C to +125°C temperature range.
How does the LTC2911HDDB-2#TRMPBF determine its internal supply voltage (VCC), and why does it matter for system design?
The LTC2911HDDB-2#TRMPBF derives its internal VCC from the higher of the V1 (3.3V) or V2 (2.5V) supply pins - not from a dedicated VCC pin. This architecture eliminates the need for an auxiliary bias supply and ensures operation even if one rail is absent. For LTC2911HDDB-2#TRMPBF, this means VCC is always ≥2.5V when both rails are present, supporting robust internal logic and output drive strength without external regulation.
Can the LTC2911HDDB-2#TRMPBF monitor a 1.8V supply instead of the specified 2.5V on V2?
No - the LTC2911HDDB-2#TRMPBF is factory-configured for 2.5V monitoring on V2 (LTC2911-2 variant), with a fixed 2.338V threshold (2.5V – 6.5%). To monitor 1.8V, the correct part is LTC2911HDDB-3#TRMPBF (LTC2911-3), which has a 1.683V V2 threshold. Using LTC2911HDDB-2#TRMPBF for 1.8V would result in premature or missed reset assertion due to threshold mismatch.
What is the function of the exposed pad (pin 9) on the DFN package of LTC2911HDDB-2#TRMPBF, and is PCB connection mandatory?
The exposed pad (pin 9) on the LTC2911HDDB-2#TRMPBF DFN package is electrically and thermally connected to GND. While optional per datasheet, connecting it to a solid PCB ground plane is strongly recommended to achieve the specified θJA = 76°C/W and ensure stable operation under sustained load. Omitting the connection degrades thermal performance and may cause parameter drift at high ambient temperatures.
How does the PFI hysteresis of LTC2911HDDB-2#TRMPBF improve system reliability in noisy environments?
The LTC2911HDDB-2#TRMPBF implements 15mV typical hysteresis (500mV falling / 515mV rising) on the PFI input, providing 3% noise margin against false triggering from supply ripple or EMI. This prevents spurious PFO assertions that could initiate unnecessary shutdown sequences. The hysteresis is inherent to the comparator design and requires no external components, simplifying layout while enhancing robustness in electrically noisy automotive or industrial settings.
LTC2911HDDB-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:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x2)
LTC2911HDDB-2#TRMPBF FAQ
1.How can I place an order for LTC2911HDDB-2#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2911HDDB-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 LTC2911HDDB-2#TRMPBF reliable?
The price and inventory of LTC2911HDDB-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 LTC2911HDDB-2#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC2911HDDB-2#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2911HDDB-2#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2911HDDB-2#TRMPBF?
LTC2911HDDB-2#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2911HDDB-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 LTC2911HDDB-2#TRMPBF?
For technical support, including LTC2911HDDB-2#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2911HDDB-2#TRMPBF requirements.
6.How does Aetrix verify that LTC2911HDDB-2#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC2911HDDB-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 LTC2911HDDB-2#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC2911HDDB-2#TRMPBF?
All LTC2911HDDB-2#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2911HDDB-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 LTC2911HDDB-2#TRMPBF part is unused and in its original packaging.
Return procedure for LTC2911HDDB-2#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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