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Analog Devices Inc. LTC2911HDDB-5#TRMPBF
- Part No.:
- LTC2911HDDB-5#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC2911HDDB-5#TRMPBF.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL 8DFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LTC2911HDDB-5#TRMPBF from Analog Devices (formerly Linear Technology) is a precision triple supply monitor IC with power-fail comparator and latched reset functionality, designed for automotive-grade systems. It monitors V1 (3.3V), V2 (adjustable, 0.5V threshold), and ADJ (adjustable, 0.5V threshold) with ±1.5% threshold accuracy over –40°C to +125°C, 30µA typical quiescent current, and internal 200ms reset timeout - used in engine control units, ADAS domain controllers, and automotive infotainment power sequencing.
For engineers reviewing the LTC2911HDDB-5#TRMPBF datasheet, LTC2911HDDB-5#TRMPBF pinout, LTC2911HDDB-5#TRMPBF application, or LTC2911HDDB-5#TRMPBF equivalent, key selection criteria include its H-grade temperature range, dual adjustable inputs (V2/ADJ), PFI-based early power-fail warning, TMR latch capability for margin testing, and DFN-8 (3mm × 2mm) package compatibility with high-density automotive PCB layouts.
Technical Context
The LTC2911HDDB-5#TRMPBF implements three independent voltage comparators: one fixed 3.086V threshold on V1 (3.3V –6.5%), and two high-impedance 0.5V-threshold inputs on V2 and ADJ-enabling flexible resistive-divider configuration for custom supply monitoring. Its internal VCC is derived solely from V1, decoupling operation from V2/ADJ supply integrity.
It integrates a dedicated power-fail comparator (PFI/PFO) with 500mV falling-edge threshold and 15mV hysteresis, plus a programmable reset timeout (internal 200ms or external capacitor), and TMR pin latch mode for deterministic RST state hold during system margining - all operating down to VCC = 0.5V for robust low-voltage supervision.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| V1 Threshold | 3.086V ±1.5% (3.3V supply –6.5% trip point, guaranteed across –40°C to +125°C) |
| V2 / ADJ Threshold | 500mV ±7.5mV (0.5V nominal, enables custom trip points via resistive dividers) |
| PFI Threshold | 500mV falling edge, 515mV rising edge (3% hysteresis for noise-immune power-fail detection) |
| Quiescent Current | 30µA typical (drawn only from V1, enabling stable operation even if V2/ADJ are unpowered) |
| Reset Timeout | 200ms internal (TMR tied to V1); externally configurable down to ~20ms with 2.2nF capacitor) |
| Min Operating VCC | 0.5V guaranteed (ensures valid RST/PFO logic states during brown-out and power-up ramp) |
| Package | 8-lead 3mm × 2mm plastic DFN (exposed pad, θJA = 76°C/W, automotive AEC-Q200 suitable) |
Pinout & Package
Package: 8-lead (3mm × 2mm) plastic DFN with exposed thermal pad (Pin 9, optional GND connection). Designed for high-reliability automotive PCB assembly and thermal performance (θJA = 76°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V2 | Adjustable supply monitor input | High-impedance 0.5V-threshold comparator input; configured via external resistor divider for custom trip voltage |
| V1 | 3.3V supply monitor & primary power source | Fixed 3.086V undervoltage detector; supplies internal VCC and powers RST/PFO pull-ups |
| PFO | Power-fail logic output | Open-drain output asserting low when PFI < 500mV; provides early warning of imminent supply collapse |
| RST | Reset logic output | Open-drain reset signal pulled low if any monitored input falls below threshold; holds valid down to VCC = 0.5V |
| PFI | Power-fail monitor input | 0.5V-threshold comparator input for configuring early-warning trip point (e.g., main battery or DC/DC input) |
| ADJ | Second adjustable supply monitor input | Identical 0.5V-threshold input to V2; enables triple-supply monitoring with two custom rails |
| TMR | Reset timeout and latch control | Configures internal 200ms timeout (tie to V1) or enables RST state latch (pull to GND) for margin testing |
| GND | Device ground reference | Primary ground return; exposed pad (Pin 9) may be connected to PCB ground plane for improved thermal and EMI performance |
Key Features
| Feature | Design Value |
|---|---|
| Triple independent voltage monitoring | Simultaneous supervision of 3.3V (V1), plus two user-configurable rails (V2 & ADJ) - eliminates need for multiple discrete supervisors |
| Automotive-grade temperature range | –40°C to +125°C operation (H-grade), qualified for under-hood and ADAS applications requiring extended thermal stability |
| Power-fail early warning with hysteresis | PFI/PFO path provides deterministic 3% hysteresis (500mV/515mV thresholds) to prevent false triggers during noisy supply transients |
| Latch-enabled margin testing | TMR pin allows RST state to be held indefinitely during voltage margining - simplifies validation without system reset interference |
| Ultra-low-voltage operation | Guaranteed RST/PFO functionality at VCC = 0.5V ensures clean reset assertion during deep brown-out conditions |
Applications
| Engine Control Unit (ECU) Power Sequencing | ADAS Domain Controller Supervision |
|---|---|
Use Scenario: Monitoring 3.3V microcontroller core rail, 5V sensor interface rail (via V2 divider), and 1.2V GPU rail (via ADJ divider) during cold-crank and load-dump events. IC Role / Device Role / Timing Role: Triple-supply supervisor ensuring synchronized reset release only after all rails stabilize above thresholds for ≥200ms. Use Value: Prevents firmware corruption by guaranteeing MCU reset remains asserted until all critical supplies meet timing and voltage integrity requirements. | Use Scenario: Detecting early voltage sag on 12V battery input (via PFI divider) before 3.3V/1.8V domain rails collapse in radar/vision fusion controller. IC Role / Device Role / Timing Role: Power-fail comparator triggering PFO low to initiate controlled shutdown sequence via processor NMI interrupt. Use Value: Enables safe storage of radar point-cloud data to nonvolatile memory prior to full system power loss. |
| Automotive Infotainment Head Unit | Electric Power Steering (EPS) Module |
Use Scenario: Validating 3.3V SoC I/O rail, adjustable 1.8V display interface rail (V2), and 1.0V DDR termination rail (ADJ) during ignition-on power-up. IC Role / Device Role / Timing Role: Simultaneous triple-rail monitoring with internal 200ms timeout to coordinate boot readiness across heterogeneous subsystems. Use Value: Eliminates race conditions between audio DSP, touchscreen controller, and video decoder initialization sequences. | Use Scenario: Latching RST state during functional safety margin testing where motor driver supply is intentionally reduced to verify fail-safe response. IC Role / Device Role / Timing Role: TMR pin used to hold RST low while V1 is swept from 3.3V down to 2.7V, verifying ASIL-B compliant reset behavior. Use Value: Enables deterministic fault injection without unintended system resets, accelerating ISO 26262 validation cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326HUT+T | Single 3.3V reset with manual reset input; no PFI, no adjustable inputs, no latch mode | Limited to basic reset generation; cannot replace triple-monitoring or power-fail warning functions | Select only for cost-sensitive non-automotive designs requiring only 3.3V supervision |
| TPS3808G33DBVR | Single 3.3V supervisor with adjustable timeout; no V2/ADJ inputs, no PFI, no latch, rated only to 105°C | Cannot monitor >1 supply or provide early power-fail warning; insufficient for ASIL-B automotive use | Use only in industrial or consumer applications where triple monitoring and automotive temp range are not required |
Compared with MAX6326HUT+T and TPS3808G33DBVR, the LTC2911HDDB-5#TRMPBF uniquely delivers triple adjustable monitoring, integrated PFI/PFO early-warning, TMR latch for margin testing, and full –40°C to +125°C operation - making it the only option qualified for ASIL-B automotive power management.
Availability
LTC2911HDDB-5#TRMPBF is available at Aetrix Electronics and suitable for automotive engine control units, ADAS domain controllers, and electric power steering modules requiring stable component supply with AEC-Q200-aligned reliability and long-term lifecycle support.
Supply support for LTC2911HDDB-5#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.
The LTC2911 family was designed specifically for high-accuracy, low-power multi-rail supervision in automotive, industrial, and computing systems - emphasizing ±1.5% threshold stability, ultra-low-voltage operation, and integrated power-fail warning.
FAQ
What is the exact reset threshold voltage for the V1 pin on the LTC2911HDDB-5#TRMPBF?
The V1 pin on the LTC2911HDDB-5#TRMPBF has a guaranteed reset threshold of 3.086V ±1.5% (3.036V to 3.135V) over the full –40°C to +125°C operating range. This corresponds to a –6.5% trip point relative to a nominal 3.3V supply, ensuring reliable undervoltage detection without false triggering due to supply tolerance overlap.
How does the LTC2911HDDB-5#TRMPBF differ from the LTC2911-1 or LTC2911-2 variants?
The LTC2911HDDB-5#TRMPBF is the H-grade (–40°C to +125°C), DFN-packaged variant of the LTC2911-5 option - meaning it monitors V1 (3.3V), V2 (adjustable), and ADJ (adjustable), unlike LTC2911-1 (V1=3.3V, V2=5V) or LTC2911-2 (V1=3.3V, V2=2.5V). Its V2 and ADJ pins both feature 0.5V thresholds, enabling dual custom-rail monitoring in automotive applications.
Can the LTC2911HDDB-5#TRMPBF monitor two different adjustable supplies simultaneously?
Yes - the LTC2911HDDB-5#TRMPBF supports simultaneous monitoring of two independently configured supplies via its V2 and ADJ pins, each with a 0.5V threshold. Using external resistor dividers, designers can set distinct trip voltages (e.g., 1.8V on V2, 1.0V on ADJ), enabling true triple-supply supervision (V1 fixed + V2 adjustable + ADJ adjustable) in space-constrained automotive modules.
What is the purpose of the TMR pin on the LTC2911HDDB-5#TRMPBF, and how is it used?
The TMR pin on the LTC2911HDDB-5#TRMPBF serves dual functions: (1) tying it to V1 enables the internal 200ms reset timeout, and (2) pulling it to GND latches the current RST state (high or low) for margin testing. This latch feature prevents spurious resets during voltage sweeps, making the LTC2911HDDB-5#TRMPBF essential for ISO 26262-compliant functional safety validation.
Does the LTC2911HDDB-5#TRMPBF require external pull-up resistors on RST and PFO outputs?
The LTC2911HDDB-5#TRMPBF provides weak internal pull-ups to V1 (typically 29µA at V1 = 3.3V) on both RST and PFO. External pull-up resistors are optional but recommended for faster rise times or when driving loads requiring higher sink/source current - especially when interfacing with 5V-tolerant logic or long PCB traces susceptible to noise coupling.
LTC2911HDDB-5#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:
- 3.086V, Adj, 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-5#TRMPBF FAQ
1.How can I place an order for LTC2911HDDB-5#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2911HDDB-5#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-5#TRMPBF reliable?
The price and inventory of LTC2911HDDB-5#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-5#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC2911HDDB-5#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2911HDDB-5#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2911HDDB-5#TRMPBF?
LTC2911HDDB-5#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2911HDDB-5#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-5#TRMPBF?
For technical support, including LTC2911HDDB-5#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2911HDDB-5#TRMPBF requirements.
6.How does Aetrix verify that LTC2911HDDB-5#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC2911HDDB-5#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-5#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC2911HDDB-5#TRMPBF?
All LTC2911HDDB-5#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2911HDDB-5#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-5#TRMPBF part is unused and in its original packaging.
Return procedure for LTC2911HDDB-5#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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