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Analog Devices Inc. LTC2911HDDB-3#TRMPBF
- Part No.:
- LTC2911HDDB-3#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC2911HDDB-3#TRMPBF.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:440
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Product details
Overview
LTC2911HDDB-3#TRMPBF from Analog Devices (formerly Linear Technology) is a precision triple supply monitor IC with integrated power-fail comparator and reset latching capability. It monitors 3.3V (V1), 1.8V (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 multi-rail power sequencing and brownout detection.
For engineers reviewing the LTC2911HDDB-3#TRMPBF datasheet, LTC2911HDDB-3#TRMPBF pinout, LTC2911HDDB-3#TRMPBF application, or LTC2911HDDB-3#TRMPBF equivalent, key selection criteria include guaranteed 0.5V operation, PFI hysteresis of 15mV typical, RST/PFO output drive capability at VCC ≥ 0.5V, latch-enabled margin testing support, and DFN-8 (3mm × 2mm) package compatibility with high-temperature automotive PCB layouts.
Technical Context
The LTC2911HDDB-3#TRMPBF implements three independent voltage comparators: V1 fixed at 3.086V (–6.5% of 3.3V), V2 fixed at 1.683V (–6.5% of 1.8V), and ADJ with 500mV nominal threshold. All comparators feature 1.5% total threshold error across temperature and include glitch filtering for noise immunity.
Its power-fail path uses PFI with 500mV falling-edge threshold and 515mV rising-edge threshold (15mV hysteresis), driving PFO low for early warning. The TMR pin enables internal 200ms timeout (when tied to V1) or external capacitor-based timing, and supports latching RST state by pulling TMR to GND - critical for controlled voltage margining in AEC-Q100-compliant systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| V1 Threshold | 3.086V ±1.5% - guarantees reliable 3.3V rail monitoring down to –40°C to +125°C without recalibration |
| V2 Threshold | 1.683V ±1.5% - precisely tracks 1.8V supply with –6.5% trip point for automotive SoC core rails |
| ADJ Threshold | 500mV ±7.5mV - enables accurate resistive-divider configuration of third supply (e.g., 1.0V, 1.2V) |
| PFI Threshold | 500mV falling / 515mV rising - provides 3% hysteresis for noise-immune early power-fail warning |
| Quiescent Current | 30µA typical - enables always-on monitoring in battery-backed automotive modules |
| Reset Timeout | 200ms internal (TMR = V1) - eliminates external timing capacitor for simplified layout and BOM reduction |
| Min Operating VCC | 0.5V guaranteed - ensures valid RST/PFO logic states during deep brownout and cold-crank conditions |
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 sustained operation at +125°C ambient in automotive under-hood applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PFI | Power-Fail Input | Monitors system primary supply via resistive divider; triggers PFO low at 500mV falling edge for early shutdown signaling |
| ADJ | Adjustable Monitor Input | High-impedance 500mV comparator input; configures third supply threshold (e.g., 1.0V) using external resistor divider |
| TMR | Reset Timeout & Latch Control | Tied to V1 → enables 200ms internal timeout; pulled to GND → latches RST state for margin testing |
| GND | Device Ground | Reference for all comparators and outputs; exposed pad improves thermal performance and EMI suppression |
| V2 | 1.8V Supply Monitor Input | Fixed –6.5% undervoltage detector for 1.8V rail; draws <30µA bias current to minimize loading |
| V1 | 3.3V Supply Monitor Input & Power Source | Primary 3.3V rail monitor and internal VCC source; powers entire IC when V2 < V1 |
| PFO | Power-Fail Output | Open-drain output pulled low on PFI threshold breach; weak internal pull-up to V1 (29µA @ 3.3V) |
| RST | Reset 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 | Independent V1 (3.3V), V2 (1.8V), and ADJ (adjustable) inputs eliminate need for multiple discrete supervisors |
| ±1.5% threshold accuracy | Reduces required voltage margin by >2% vs. ±2.5% parts - critical for tight-tolerance automotive 1.8V/3.3V rails |
| Internal 200ms timeout | Removes external timing capacitor and associated leakage sensitivity, improving long-term reliability in high-temp environments |
| RST latching via TMR | Enables deterministic voltage margin testing without unintended resets during supply ramping or transient injection |
| 0.5V guaranteed operation | Ensures valid RST/PFO logic states during cold-crank (6V battery dip) and deep brownout, preventing MCU lockup |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC I/O Module |
|---|---|
Use Scenario: Monitors 3.3V microcontroller core, 1.8V FPGA I/O, and 1.0V analog sensor supply in under-hood ECU exposed to –40°C to +125°C ambient. IC Role / Device Role / Timing Role: Triple-supply supervisor providing synchronized reset assertion, PFO-triggered NMI interrupt for controlled shutdown, and TMR-latched margin testing during calibration. Use Value: Eliminates false resets caused by transient load dumps (ISO 7637-2 Pulse 5a) due to ±1.5% threshold accuracy and 15mV PFI hysteresis. | Use Scenario: Ensures safe startup and fault response in DIN-rail mounted PLC modules with isolated 24V DC input, 5V logic, and 3.3V communication rails. IC Role / Device Role / Timing Role: Primary power integrity monitor that asserts RST on any rail undervoltage and drives PFO to initiate watchdog timeout before brownout-induced firmware corruption. Use Value: 30µA quiescent current enables always-on monitoring without compromising standby power budget in energy-sensitive industrial gateways. |
| Medical Infusion Pump Controller | Avionics Power Management Unit |
Use Scenario: Validates 3.3V MCU, 1.8V ADC/DAC, and adjustable 2.5V reference supply in Class II medical device requiring IEC 60601-1 compliance. IC Role / Device Role / Timing Role: Safety-critical supply monitor with latched RST enabling deterministic fail-safe behavior during battery switchover and ESD transients. Use Value: Guaranteed 0.5V operation prevents indeterminate reset states during 100ms battery backup transitions, meeting SIL-2 functional safety requirements. | Use Scenario: Supervises redundant 28V aircraft bus-derived 5V, 3.3V, and 1.8V supplies in DO-160G Zone 3 avionics equipment. IC Role / Device Role / Timing Role: High-reliability triple-monitor with PFI configured to detect main bus sag before secondary supplies collapse, triggering graceful power-down sequence. Use Value: Internal 200ms timeout removes capacitor aging drift - essential for 20-year lifecycle avionics where component replacement is impractical. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326US33D3+T | Single 3.3V reset only; no V2/ADJ monitoring, no PFI, no latching; SOT23-3 package | Only suitable for basic 3.3V rail supervision - cannot replace triple-monitor functionality | Select only if design requires minimal footprint and monitors only one rail |
| TPS3808G33DBVR | Single 3.3V supervisor with adjustable delay; no V2/ADJ inputs, no PFI, no latch; SOT23-6 package | Lacks multi-rail capability and early power-fail warning - requires additional components for full LTC2911HDDB-3#TRMPBF function | Choose when cost is primary constraint and system has separate PFI circuitry |
Compared with MAX6326US33D3+T and TPS3808G33DBVR, the LTC2911HDDB-3#TRMPBF uniquely integrates triple-rail monitoring, PFI early-warning, and RST latching in a single DFN-8 package - reducing board area by >60% and eliminating inter-component timing skew in safety-critical automotive and industrial systems.
Availability
LTC2911HDDB-3#TRMPBF is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLCs, 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-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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving automotive, industrial, communications, and healthcare markets.
The LTC2911 family was designed specifically for high-accuracy, multi-rail power monitoring in harsh environments - emphasizing ±1.5% threshold stability, ultralow operating voltage, and latch-enabled margin testing for AEC-Q100 Grade H automotive applications.
FAQ
What is the exact V2 supply threshold for LTC2911HDDB-3#TRMPBF?
The LTC2911HDDB-3#TRMPBF is the -3 variant, specifying a fixed 1.8V supply monitor on V2. Its guaranteed threshold is 1.683V (–6.5% of 1.8V) with ±1.5% accuracy over –40°C to +125°C, corresponding to a min/max range of 1.656V to 1.710V per the Electrical Characteristics table.
Does LTC2911HDDB-3#TRMPBF require an external capacitor for reset timeout?
No. The LTC2911HDDB-3#TRMPBF supports an internal 200ms reset timeout when the TMR pin is tied to V1. This eliminates the need for an external timing capacitor, reducing BOM count and avoiding capacitor leakage-related timing drift - especially beneficial in high-temperature automotive applications.
How does the PFI input function in LTC2911HDDB-3#TRMPBF?
The PFI input in LTC2911HDDB-3#TRMPBF monitors an external voltage via a resistive divider and compares it to a 500mV falling-edge threshold (515mV rising-edge), generating a 15mV hysteresis. When PFI falls below 500mV, PFO pulls low to provide early warning of impending power failure - enabling controlled shutdown before monitored supplies collapse.
Can LTC2911HDDB-3#TRMPBF operate with VCC below 1.0V?
Yes. The LTC2911HDDB-3#TRMPBF guarantees valid RST and PFO logic states down to VCC = 0.5V, confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables. This ensures reliable reset assertion and power-fail signaling during severe brownout and cold-crank conditions common in automotive 12V systems.
What is the purpose of the TMR pin in LTC2911HDDB-3#TRMPBF?
The TMR pin in LTC2911HDDB-3#TRMPBF serves dual functions: (1) when tied to V1, it enables the internal 200ms reset timeout; (2) when pulled to GND, it latches the current RST state - freezing the output regardless of input voltage changes. This latch mode is essential for deterministic voltage margin testing in production and qualification.
LTC2911HDDB-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:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x2)
LTC2911HDDB-3#TRMPBF FAQ
1.How can I place an order for LTC2911HDDB-3#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2911HDDB-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 LTC2911HDDB-3#TRMPBF reliable?
The price and inventory of LTC2911HDDB-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 LTC2911HDDB-3#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC2911HDDB-3#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2911HDDB-3#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2911HDDB-3#TRMPBF?
LTC2911HDDB-3#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2911HDDB-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 LTC2911HDDB-3#TRMPBF?
For technical support, including LTC2911HDDB-3#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2911HDDB-3#TRMPBF requirements.
6.How does Aetrix verify that LTC2911HDDB-3#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC2911HDDB-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 LTC2911HDDB-3#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC2911HDDB-3#TRMPBF?
All LTC2911HDDB-3#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2911HDDB-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 LTC2911HDDB-3#TRMPBF part is unused and in its original packaging.
Return procedure for LTC2911HDDB-3#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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