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Analog Devices Inc. LTC2911HDDB-3#TRPBF
- Part No.:
- LTC2911HDDB-3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC2911HDDB-3#TRPBF.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,061
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Product details
Overview
LTC2911HDDB-3#TRPBF from Analog Devices (acquired Linear Technology) is a precision triple supply monitor IC with integrated power-fail comparator and latchable reset output. It monitors 3.3V (V1), 1.8V (V2), and an adjustable supply (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 control units.
For engineers reviewing the LTC2911HDDB-3#TRPBF datasheet, LTC2911HDDB-3#TRPBF pinout, LTC2911HDDB-3#TRPBF application, or LTC2911HDDB-3#TRPBF equivalent, key selection criteria include its H-grade automotive temperature range, DFN-8 (3mm × 2mm) package, triple-supply monitoring capability with independent ADJ/PFI thresholds, and latch-enabled margin testing support.
Technical Context
The LTC2911HDDB-3#TRPBF implements three independent voltage comparators - one fixed at 3.3V (V1), one fixed at 1.8V (V2), and one adjustable via external resistor divider on the ADJ pin with 500mV nominal threshold. Its PFI input feeds a dedicated power-fail comparator with 500mV falling-edge and 515mV rising-edge thresholds, providing 3% hysteresis for noise immunity.
Reset assertion is synchronized across all monitored inputs with propagation delay ≤80µs; the TMR pin enables either external capacitor–set timeout (9.4ms/nF), internal 200ms timeout (TMR = V1), or latched RST state (TMR = GND). Internal VCC is derived from the higher of V1 or V2, supporting operation down to 0.5V.
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 | 1.683V ±1.5% - precisely monitors 1.8V rails (e.g., core logic, I/O buffers) without external calibration |
| ADJ Threshold | 500mV ±1.5% - enables configurable third supply monitoring (e.g., 1.2V, 2.5V) using resistive divider |
| PFI Threshold | 500mV falling / 515mV rising - provides early warning of primary supply collapse with built-in 3% hysteresis |
| Reset Timeout | 200ms internal (TMR = V1) - eliminates external timing capacitor, reducing BOM count and layout area |
| Supply Current | 30µA typical - enables always-on monitoring in low-power automotive subsystems without battery drain |
| Operating Temp | –40°C to +125°C - qualified for under-hood and engine-control module applications per AEC-Q100 stress requirements |
Pinout & Package
Package: 8-lead (3mm × 2mm) plastic DFN with exposed pad (pin 9 = GND, optional PCB connection). Thermal resistance θJA = 76°C/W enables high-reliability operation in thermally constrained automotive modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PIN 1 (PFI) | Power-Fail Input | Monitors primary system supply (e.g., 12V battery rail) via resistive divider; triggers PFO low at 500mV falling edge |
| PIN 2 (ADJ) | Adjustable Monitor Input | Configurable third supply threshold (e.g., 1.2V, 2.5V) using external resistor divider; 500mV reference |
| PIN 3 (TMR) | Reset Timeout Control | Selects reset behavior: open = ~400µs, cap-to-GND = programmable timeout, V1 = 200ms internal, GND = RST latch |
| PIN 4 (GND) | Device Ground | Reference for all analog comparators and digital outputs; exposed pad must be connected to PCB ground plane for thermal performance |
| PIN 5 (RST) | Reset Output | Open-drain active-low output pulled up internally to V1; asserts low if any monitored supply falls below threshold |
| PIN 6 (PFO) | Power-Fail Output | Open-drain active-low output pulled up internally to V1; signals imminent supply failure before RST asserts |
| PIN 7 (V1) | 3.3V Supply Monitor | Fixed 3.3V rail monitor with 3.086V threshold; also supplies internal VCC when ≥ V2 |
| PIN 8 (V2) | 1.8V Supply Monitor | Fixed 1.8V rail monitor with 1.683V threshold; supplies internal VCC when > V1 |
Key Features
| Feature | Design Value |
|---|---|
| ±1.5% threshold accuracy over temp | Eliminates need for external trimming or calibration in automotive designs; ensures deterministic reset timing across operating range |
| Internal 200ms reset timeout | Removes external timing capacitor and associated leakage/aging concerns, improving long-term reliability in harsh environments |
| Latchable RST output | Enables hardware-based margin testing by holding reset state during voltage sweeps without software intervention |
| 0.5V minimum VCC operation | Guarantees valid RST/PFO logic states during brown-out conditions and uncontrolled power ramp-up sequences |
| Glitch-immune comparators | Input filtering prevents false resets from EMI or transient noise common in automotive electrical systems |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC I/O Module |
|---|---|
Use Scenario: Monitors 3.3V microcontroller core, 1.8V FPGA I/O, and 5V sensor interface rails in under-hood ECU with wide ambient temperature swings. IC Role / Device Role / Timing Role: Triple-supply supervisor ensuring safe boot and shutdown sequencing; PFO triggers NMI interrupt for controlled firmware save before main supply collapse. Use Value: Prevents data corruption during ignition cycling by asserting RST only after all rails stabilize for 200ms, and issuing PFO warning 10–50ms earlier than RST. | Use Scenario: Validates 3.3V processor, 1.8V communication PHY, and 24V fieldbus interface supplies in DIN-rail mounted PLC with extended industrial temperature range. IC Role / Device Role / Timing Role: Fault-tolerant supply monitor with latch mode enabling offline voltage margining of isolated power domains without system reset. Use Value: Reduces field failure rate by catching undervoltage faults before logic errors occur, with ±1.5% accuracy eliminating design margin over-provisioning. |
| Automotive ADAS Camera Module | Medical Diagnostic Imaging Subsystem |
Use Scenario: Ensures clean power-up of 3.3V image sensor interface, 1.8V ISP core, and adjustable 1.2V memory rail in compact camera housing near vehicle exterior. IC Role / Device Role / Timing Role: Precision supply monitor with minimal footprint (3mm × 2mm DFN) and guaranteed operation at 125°C junction temperature. Use Value: Enables single-chip triple monitoring instead of three discrete supervisors, saving PCB area and improving thermal coupling consistency. | Use Scenario: Supervises 3.3V FPGA configuration, 1.8V ADC front-end, and adjustable 2.5V reference supply in radiation-hardened imaging controller. IC Role / Device Role / Timing Role: High-accuracy reset generator with latch mode supporting safety-critical functional verification during maintenance cycles. Use Value: Meets IEC 62304 Class C software safety requirements by guaranteeing deterministic reset behavior under all fault conditions. |
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 3.3V/2.5V/1.2V thresholds; no adjustable ADJ/PFI; 140ms fixed timeout; SO-8 package | Lacks configurability for non-standard rails; unsuitable for 1.8V monitoring or custom PFI thresholds | Choose only if exact 3.3V/2.5V/1.2V monitoring is required and DFN footprint is not needed |
| TPS3808G33DBVR | Single 3.3V monitor; no V2/ADJ/PFI; 200ms timeout; SOT-23-6 package | Requires two additional ICs to match LTC2911HDDB-3#TRPBF's triple-monitor function | Select only for cost-sensitive, space-tolerant designs where multi-rail coordination is unnecessary |
Compared with MAX6369AUT+T and TPS3808G33DBVR, the LTC2911HDDB-3#TRPBF delivers integrated triple monitoring with adjustable thresholds, automotive-grade temperature range, and latch functionality in a compact DFN-reducing component count, board area, and validation effort for complex embedded systems.
Availability
LTC2911HDDB-3#TRPBF is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC I/O modules, ADAS camera systems, and medical diagnostic subsystems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC2911HDDB-3#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving automotive, industrial, communications, and healthcare markets.
The LTC2911 product line was developed by Linear Technology (acquired by ADI in 2017) specifically for precision power supply monitoring in safety-critical automotive and industrial systems requiring guaranteed operation across extreme temperatures and low-voltage conditions.
FAQ
What is the exact reset threshold voltage for the V2 pin on the LTC2911HDDB-3#TRPBF?
The V2 pin on the LTC2911HDDB-3#TRPBF has a nominal 1.8V monitoring threshold with a guaranteed value of 1.683V ±1.5% over the full –40°C to +125°C operating temperature range. This corresponds to a 1.8V supply with –6.5% tolerance, ensuring robust detection of undervoltage conditions without false triggering due to supply ripple or temperature drift. The LTC2911HDDB-3#TRPBF datasheet specifies this as VRT18 in the Electrical Characteristics table.
Does the LTC2911HDDB-3#TRPBF support latch mode for margin testing, and how is it activated?
Yes, the LTC2911HDDB-3#TRPBF supports hardware latch mode for margin testing via the TMR pin. Pulling TMR to GND latches the current RST output state (high or low), overriding normal reset timing and allowing voltage sweeps without unintended system resets. Release is achieved by driving TMR above VTMR(LATCH) (0.20V typical). This feature is fully documented in the Timing Diagrams section of the LTC2911HDDB-3#TRPBF datasheet and requires no firmware interaction.
Can the LTC2911HDDB-3#TRPBF monitor a 5V supply on the V2 pin?
No, the LTC2911HDDB-3#TRPBF is specifically configured as the LTC2911-3 variant, which fixes the V2 pin to monitor a 1.8V supply (threshold = 1.683V). To monitor 5V, the LTC2911HDDB-1#TRPBF (LTC2911-1 variant) must be used. The part number suffix "-3" in LTC2911HDDB-3#TRPBF explicitly denotes the 1.8V V2 option, as defined in the Product Selection Guide and confirmed by the marking "LFPJ" on the device body.
What is the maximum allowable leakage current for the external capacitor on the TMR pin of the LTC2911HDDB-3#TRPBF?
The external capacitor on the TMR pin of the LTC2911HDDB-3#TRPBF must exhibit leakage current ≤500nA to maintain timer accuracy. Higher leakage degrades the 9.4ms/nF timing constant, causing significant timeout deviation - especially critical in automotive applications where precise reset timing affects ASIL compliance. Ceramic capacitors with X7R or C0G dielectrics meet this requirement; aluminum electrolytic or high-leakage tantalum types do not. This specification is stated in the Applications Information section of the LTC2911HDDB-3#TRPBF datasheet.
How does the LTC2911HDDB-3#TRPBF derive its internal supply voltage (VCC), and what is the minimum operational VCC?
The LTC2911HDDB-3#TRPBF derives its internal supply voltage (VCC) from the higher of the V1 (3.3V) or V2 (1.8V) input voltages. Its minimum guaranteed operational VCC is 0.5V, enabling valid RST and PFO logic states even during deep brown-out conditions. This ultra-low VCC capability ensures deterministic reset behavior during uncontrolled power ramp-up or battery sag events, a key requirement validated for automotive use cases in the LTC2911HDDB-3#TRPBF datasheet.
LTC2911HDDB-3#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:
- 1.683V, 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-3#TRPBF FAQ
1.How can I place an order for LTC2911HDDB-3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2911HDDB-3#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-3#TRPBF reliable?
The price and inventory of LTC2911HDDB-3#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-3#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2911HDDB-3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2911HDDB-3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2911HDDB-3#TRPBF?
LTC2911HDDB-3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2911HDDB-3#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-3#TRPBF?
For technical support, including LTC2911HDDB-3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2911HDDB-3#TRPBF requirements.
6.How does Aetrix verify that LTC2911HDDB-3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2911HDDB-3#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-3#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2911HDDB-3#TRPBF?
All LTC2911HDDB-3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2911HDDB-3#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-3#TRPBF part is unused and in its original packaging.
Return procedure for LTC2911HDDB-3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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