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Analog Devices Inc. LTC2911HDDB-3
- Part No.:
- LTC2911HDDB-3
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC2911HDDB-3.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,938
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Product details
Overview
LTC2911HDDB-3 from Analog Devices (formerly Linear Technology) is a precision triple supply monitor IC with integrated power-fail comparator and latched reset control, designed for automotive-grade systems requiring high threshold accuracy (±1.5%), low quiescent current (30 µA typical), and guaranteed operation down to 0.5 V supply voltage. It monitors V1 = 3.3 V (–6.5% threshold), V2 = 1.8 V (–6.5% threshold), and an adjustable ADJ input (500 mV nominal), supporting critical power sequencing in engine control units and ADAS modules.
For engineers reviewing the LTC2911HDDB-3 datasheet, LTC2911HDDB-3 pinout, LTC2911HDDB-3 application, or LTC2911HDDB-3 equivalent, this page delivers verified technical context, exact pin functions, real-world timing behavior (200 ms internal timeout, 8–80 µs propagation delay), automotive temperature range (–40°C to +125°C), and validated alternative options - all confirmed against official Linear Technology documentation and DFN package specifications.
Technical Context
The LTC2911HDDB-3 implements three independent undervoltage comparators (V1, V2, ADJ) with ±1.5% threshold accuracy over –40°C to +125°C, each feeding into a glitch-filtered reset logic block. Its PFI/PFO path provides a dedicated 500 mV falling-edge power-fail detection with 15 mV hysteresis, decoupled from the main reset function to enable early warning signaling before system brownout.
Reset timeout is selectable via TMR pin: internally fixed at 200 ms (TMR tied to V1) or externally programmable (9.4 ms/nF with CTMR to GND). The TMR pin also supports latch mode - pulling it to GND freezes RST state, enabling margin testing without spurious resets during voltage stress.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| V1 Threshold | 3.086 V (3.3 V × 0.935); guarantees reset assertion before 3.3 V supply falls below –6.5% tolerance band |
| V2 Threshold | 1.683 V (1.8 V × 0.935); matches LTC2911-3 variant specification for 1.8 V rail monitoring |
| ADJ Threshold | 500 mV ±7.5 mV; enables precise resistive-divider configuration of third supply trip point |
| PFI Threshold | 500 mV falling / 515 mV rising; provides 3% hysteresis for noise-immune power-fail detection |
| Reset Timeout | 200 ms (internal) or 15–27 ms (external, CTMR = 2.2 nF); ensures sufficient hold time for processor initialization |
| Supply Current | 30 µA typical at TA = 25°C; enables always-on monitoring in low-power automotive subsystems |
| Operating Temp | –40°C to +125°C (H-grade); qualified for under-hood and safety-critical automotive applications |
Pinout & Package
Package: 8-lead (3 mm × 2 mm) plastic DFN (DDB), exposed pad (Pin 9) connected to GND. RoHS-compliant, lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PFI | Power-fail input | Monitors external supply via resistive divider; asserts PFO low when voltage falls below 500 mV |
| ADJ | Adjustable monitor input | High-impedance 500 mV comparator input; used with resistor divider to set third supply threshold |
| TMR | Reset timeout/latch control | Tied to V1 → 200 ms internal timeout; pulled to GND → latches RST state for margin testing |
| GND | Device ground reference | Primary return path; exposed pad (Pin 9) must be connected to PCB ground plane for thermal and electrical integrity |
| V2 | Second supply monitor input | Configured for 1.8 V (–6.5%) threshold per LTC2911-3 spec; bypass with ≥0.1 µF capacitor |
| V1 | Primary supply monitor input | Fixed 3.3 V (–6.5%) threshold; supplies internal VCC and provides weak pull-up for RST/PFO outputs |
| PFO | Power-fail logic output | Open-drain output pulled low on PFI fault; provides early warning signal to MCU NMI or shutdown controller |
| RST | Reset logic output | Open-drain reset output asserted low if any monitored supply (V1/V2/ADJ) falls below threshold for timeout period |
Key Features
| Feature | Design Value |
|---|---|
| Triple simultaneous monitoring | Independent V1 (3.3 V), V2 (1.8 V), and ADJ (adjustable) inputs eliminate need for multiple discrete supervisors |
| ±1.5% threshold accuracy | Reduces required system voltage margin by >2× vs. ±3% parts, improving reliability in tight-tolerance 1.8 V/3.3 V domains |
| Programmable reset timeout | Internal 200 ms or external capacitor-based timing (9.4 ms/nF) avoids BOM cost of external RC networks |
| Power-fail comparator with hysteresis | 500 mV/515 mV thresholds provide noise-immune early warning before main supply collapse |
| Reset latch mode | TMR pin pull-to-GND freezes RST state, enabling controlled voltage margining without unintended system reset |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance Systems (ADAS) |
|---|---|
|
Use Scenario: Real-time monitoring of 3.3 V microcontroller core supply, 1.8 V sensor interface rail, and adjustable 5 V camera power domain during cold cranking. IC Role / Device Role / Timing Role: Triple-supply supervisor asserting RST only after all rails stabilize for ≥200 ms; PFO triggers camera shutdown sequence when battery drops below 10.5 V. Use Value: Prevents ECU lockup during transient voltage dips; enables deterministic fail-safe response before LiFePO₄ battery reaches end-of-discharge. |
Use Scenario: Power integrity supervision for radar SoC (3.3 V), image signal processor (1.8 V), and adjustable 5 V power amplifier in 77 GHz radar module. IC Role / Device Role / Timing Role: Monitors all three rails simultaneously; uses ADJ input to track PA bias voltage; PFO signals host processor 100 ms before RST assertion. Use Value: Provides 100 ms advance warning to save radar frame buffer contents to nonvolatile memory prior to full system reset. |
| Automotive Infotainment Head Unit | Electric Power Steering (EPS) Controller |
|
Use Scenario: Ensuring clean power-up sequencing of application processor (3.3 V), DDR memory I/O (1.8 V), and adjustable 12 V display backlight driver. IC Role / Device Role / Timing Role: Uses resistive divider on ADJ to monitor 12 V rail; latches RST during voltage margining tests to verify boot stability at 2.8 V. Use Value: Eliminates false resets during ignition transients; validates system robustness across full automotive temperature range (–40°C to +125°C). |
Use Scenario: Monitoring 3.3 V MCU supply, 1.8 V CAN transceiver rail, and adjustable 5 V motor driver gate drive supply in torque-assist control loop. IC Role / Device Role / Timing Role: PFI input tracks 12 V battery via divider; PFO interrupt initiates safe torque ramp-down before RST deactivates motor drivers. Use Value: Enables ASIL-B compliant graceful degradation - maintains steering assist for 150 ms after battery sag detection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326UT46D3+ | Fixed 4.63 V V2 threshold (not 1.8 V); no ADJ input; 140 ms timeout only; ±2.5% threshold accuracy | Limited to dual-rail (3.3 V + 4.63 V) monitoring; lacks adjustable third input and latch mode | Use only if 1.8 V rail monitoring and margin testing are not required; lower accuracy increases system voltage margin |
| TPS3808G33DBVR | Single 3.3 V monitor only; no V2/ADJ inputs; no PFI/PFO; 200 ms timeout; ±0.5% accuracy but no triple monitoring | Cannot replace triple-monitoring function; requires two additional supervisors for full LTC2911HDDB-3 coverage | Select only for cost-sensitive single-rail applications; total BOM cost exceeds LTC2911HDDB-3 when three rails must be supervised |
Compared with MAX6326UT46D3+ and TPS3808G33DBVR, the LTC2911HDDB-3 uniquely integrates triple-rail monitoring, programmable timeout, power-fail warning, and latch mode in one AEC-Q100 qualified DFN package - eliminating design complexity, PCB area, and qualification effort required for multi-part solutions.
Availability
LTC2911HDDB-3 is available at Aetrix Electronics and suitable for automotive engine control units, ADAS radar modules, infotainment head units, and electric power steering controllers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC2911HDDB-3 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 acquired Linear Technology in 2017 and maintains full product support, qualification, and manufacturing continuity for the LTC portfolio.
The LTC2911 family was designed specifically for high-reliability automotive and industrial power monitoring, emphasizing precision threshold accuracy, ultra-low power operation, and robust noise immunity in harsh electrical environments.
FAQ
What is the exact V2 supply threshold for LTC2911HDDB-3?
The LTC2911HDDB-3 is the H-grade (–40°C to +125°C) DFN-packaged variant of the LTC2911-3, which specifies a V2 threshold of 1.683 V (1.8 V × 0.935) with ±1.5% accuracy over temperature. This value is confirmed in the Electrical Characteristics table under VRT18 parameter and applies identically to the HDDB-3 suffix part.
Does LTC2911HDDB-3 support internal 200 ms reset timeout?
Yes, LTC2911HDDB-3 supports internal 200 ms reset timeout by tying the TMR pin to V1. This mode eliminates external components and is explicitly documented in the datasheet's "Reset Timeout Period, Internal" specification (tRST(INT) = 140–280 ms, typ. 200 ms), valid across the full –40°C to +125°C operating range.
How is the PFI input used in LTC2911HDDB-3 for power-fail detection?
In LTC2911HDDB-3, the PFI input monitors an external supply via a resistive divider to scale it down to the 500 mV threshold. When the scaled voltage falls below 500 mV, PFO pulls low - providing early warning of imminent power failure. The 15 mV hysteresis (500 mV/515 mV) prevents chatter during noisy transitions, and this behavior is identical across all LTC2911 variants including LTC2911HDDB-3.
Can LTC2911HDDB-3 operate with supply voltage below 1 V?
Yes, LTC2911HDDB-3 guarantees functional operation down to VCC = 0.5 V, as stated in the Absolute Maximum Ratings and confirmed in the "Ultralow Voltage Reset" feature. Both RST and PFO outputs remain valid and actively driven low even at 0.5 V, enabling reliable reset assertion during deep brownout conditions common in automotive stop-start systems.
What is the purpose of the exposed pad (Pin 9) on the LTC2911HDDB-3 DFN package?
The exposed pad (Pin 9) on the LTC2911HDDB-3 is internally connected to GND and must be soldered to the PCB ground plane. It serves dual purposes: thermal dissipation (reducing θJA from 195°C/W in TSOT-23 to 76°C/W in DFN) and improved electrical noise immunity by lowering ground impedance - both critical for stable operation in automotive ECU and ADAS applications.
LTC2911HDDB-3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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 FAQ
1.How can I place an order for LTC2911HDDB-3 through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2911HDDB-3 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 reliable?
The price and inventory of LTC2911HDDB-3 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 is usually 5 days.
3.What payment methods are accepted for LTC2911HDDB-3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2911HDDB-3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2911HDDB-3?
LTC2911HDDB-3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2911HDDB-3 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?
For technical support, including LTC2911HDDB-3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2911HDDB-3 requirements.
6.How does Aetrix verify that LTC2911HDDB-3 is sourced from the original manufacturer or authorized distributors?
All LTC2911HDDB-3 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 meets industry standards.
7.What is the process for return or replacement of LTC2911HDDB-3?
All LTC2911HDDB-3 units undergo pre-shipment inspection (PSI). If there is an issue with LTC2911HDDB-3, 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 part is unused and in its original packaging.
Return procedure for LTC2911HDDB-3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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