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Analog Devices Inc. LTC2911HDDB-4#TRPBF
- Part No.:
- LTC2911HDDB-4#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC2911HDDB-4#TRPBF.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,335
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Product details
Overview
LTC2911HDDB-4#TRPBF from Analog Devices (acquired Linear Technology) is a precision triple supply monitor IC with integrated power-fail comparator and latched reset functionality. It monitors 3.3V (V1), 1.2V (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 - deployed in automotive engine control units for reliable multi-rail power sequencing and brownout detection.
For engineers reviewing the LTC2911HDDB-4#TRPBF datasheet, LTC2911HDDB-4#TRPBF pinout, LTC2911HDDB-4#TRPBF application, or LTC2911HDDB-4#TRPBF equivalent, key selection criteria include its H-grade automotive temperature range, DFN-8 (3mm × 2mm) package, 1.2V V2 preset threshold, PFI-based early power-fail warning, and TMR latch capability for margin testing under voltage stress.
Technical Context
The LTC2911HDDB-4#TRPBF implements three independent voltage comparators: V1 fixed at 3.3V (–6.5% = 3.086V), V2 fixed at 1.2V (–6.5% = 1.122V), and ADJ with 500mV nominal threshold. All comparators feature 1.5% total threshold accuracy across temperature and include glitch filtering for noise immunity.
Its power-fail path uses PFI input (500mV falling / 515mV rising threshold) to drive PFO output, enabling configurable early-warning shutdown signaling. The TMR pin supports three modes: external capacitor timeout, internal 200ms timeout (TMR tied to V1), and latch mode (TMR pulled to GND) - critical for production margin testing without system reset interference.
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 false resets |
| V2 Threshold | 1.122V ±1.5% - factory-set for 1.2V supplies; eliminates need for external resistor network on V2 |
| ADJ Threshold | 500mV ±1.5% - enables precise configuration of third supply via resistive divider (e.g., 1.8V, 2.5V, 5V) |
| PFI Threshold | 500mV falling / 515mV rising - provides 3% hysteresis for robust early power-fail detection on primary supply |
| Reset Timeout | 200ms internal (TMR = V1) or 15–27ms external (CTMR = 2.2nF) - ensures sufficient hold time for processor initialization |
| Quiescent Current | 30µA typical - enables always-on monitoring in battery-backed automotive subsystems |
| Operating Temp | –40°C to +125°C - qualified for under-hood automotive applications per AEC-Q100 stress requirements |
Pinout & Package
Package: 8-lead (3mm × 2mm) plastic DFN with exposed pad (Pin 9, optional GND connection). Thermal resistance θJA = 76°C/W enables high-reliability operation in compact automotive PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (PFI) | Power-fail input | Accepts resistive-divider-scaled primary supply; triggers PFO low at 500mV falling edge for early warning |
| 2 (ADJ) | Adjustable monitor input | 500mV threshold reference; used with external divider to monitor third supply (e.g., 1.8V, 2.5V) |
| 3 (TMR) | Reset timeout/latch control | Tied to V1 → 200ms internal timeout; pulled to GND → latches RST state for margin testing |
| 4 (GND) | Device ground reference | Reference for all comparators and outputs; exposed pad (Pin 9) must be connected to PCB GND plane for thermal performance |
| 5 (RST) | Reset logic output | Open-drain active-low output; pulls low if any monitored supply falls below threshold; weak internal pull-up to V1 |
| 6 (PFO) | Power-fail logic output | Open-drain active-low output; asserts before RST to signal imminent power loss; enables controlled shutdown |
| 7 (V1) | 3.3V supply monitor & power source | Monitors 3.3V rail at 3.086V; supplies internal VCC and RST/PFO pull-up current |
| 8 (V2) | 1.2V supply monitor | Monitors 1.2V rail at 1.122V; no external components required - factory-configured for LTC2911-4 variant |
Key Features
| Feature | Design Value |
|---|---|
| Triple simultaneous monitoring | 3.3V (V1), 1.2V (V2), and adjustable (ADJ) inputs monitored concurrently with independent comparators |
| ±1.5% threshold accuracy | Guaranteed over full –40°C to +125°C range - reduces system voltage margin by ≥1.5% vs. ±2.5% competitors |
| Configurable reset timeout | Selectable 200ms internal timer or external capacitor (9.4ms/nF) - eliminates timing component count in space-constrained designs |
| Power-fail early warning | PFI/PFO path provides 500mV-triggered alert before main rails collapse - enables nonvolatile memory save and safe state transition |
| Reset latch for margin testing | TMR pin latches RST state during voltage stress tests - prevents spurious resets while validating supply tolerance margins |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC I/O Module |
|---|---|
Use Scenario: Monitors 3.3V microcontroller core, 1.2V 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 synchronized power-up sequencing and brownout detection before MCU boot. Use Value: Prevents firmware corruption during cold cranking by holding RST low until all rails stabilize above thresholds for ≥200ms. | Use Scenario: Validates 3.3V logic, 1.2V ADC reference, and 24V field bus interface supplies in DIN-rail mounted PLC modules. IC Role / Device Role / Timing Role: Fault-tolerant supply monitor with PFO-driven watchdog interrupt for predictive maintenance alerts. Use Value: PFO assertion at PFI < 500mV triggers NMI to CPU 50ms before RST activates - enabling graceful I/O shutdown and fault logging. |
| Medical Infusion Pump Controller | Avionics Power Management Unit |
Use Scenario: Ensures integrity of 3.3V ARM Cortex-M7, 1.2V DDR3L, and 5V motor driver rails in battery-operated infusion pumps. IC Role / Device Role / Timing Role: Safety-critical reset generator with latch mode for production functional safety validation (ISO 13849 PLd). Use Value: TMR latch allows forced undervoltage testing without resetting pump controller - verifying fail-safe behavior per IEC 62304. | Use Scenario: Supervises 3.3V flight computer, 1.2V FPGA config, and 28V aircraft bus-derived 5V supply in DO-160G-compliant avionics. IC Role / Device Role / Timing Role: High-reliability triple monitor with 125°C operation and ±1.5% accuracy for redundant power path validation. Use Value: Eliminates need for external trimming resistors on V2 - reducing BOM count and improving long-term calibration stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6314US29D3+T | Fixed 2.93V reset only; dual-supply monitor (VCC + VPOR); no PFI/PFO or ADJ input | Lacks third monitor channel, power-fail warning, and adjustable threshold - unsuitable for multi-rail systems requiring early warning | Select only for simple single-rail reset where cost is primary constraint and PFI/ADJ functionality is unnecessary |
| TPS3808G33DBVR | Single 3.3V monitor; no V2/ADJ inputs; no PFI/PFO; 200ms fixed timeout only | Cannot monitor 1.2V rail or provide power-fail signaling - requires additional ICs for full LTC2911HDDB-4#TRPBF functionality | Use only when supervising one supply and system design permits discrete addition of PFI/ADJ monitoring circuitry |
Compared with MAX6314US29D3+T and TPS3808G33DBVR, the LTC2911HDDB-4#TRPBF uniquely integrates triple-rail monitoring, programmable power-fail warning, and latch-enabled margin testing in a single AEC-Q100-qualified DFN package - eliminating board space, BOM count, and qualification effort for automotive and industrial safety-critical designs.
Availability
LTC2911HDDB-4#TRPBF is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC I/O 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-4#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 semiconductors, serving automotive, industrial, communications, and healthcare markets.
The LTC2911 family was designed by Linear Technology (now ADI) specifically for high-accuracy, low-power multi-rail supply monitoring in harsh environments - emphasizing ±1.5% threshold stability, glitch immunity, and automotive-grade reliability.
FAQ
What is the exact V2 reset threshold voltage for LTC2911HDDB-4#TRPBF?
The LTC2911HDDB-4#TRPBF has a factory-configured V2 threshold of 1.122V (1.2V × 0.935), guaranteed ±1.5% over –40°C to +125°C per the Electrical Characteristics table. This corresponds to a –6.5% tolerance on the nominal 1.2V supply, matching the LTC2911-4 variant specification. No external resistor is needed on V2.
Does LTC2911HDDB-4#TRPBF support internal 200ms reset timeout without external components?
Yes. The LTC2911HDDB-4#TRPBF supports internal 200ms reset timeout by tying the TMR pin directly to V1. This eliminates the need for an external timing capacitor and reduces component count. The internal timeout is specified at 140ms to 280ms over temperature, with typical value 200ms.
Can LTC2911HDDB-4#TRPBF monitor a 5V supply using the ADJ pin?
Yes. The ADJ pin has a 500mV nominal threshold with ±1.5% accuracy. To monitor a 5V supply, use a resistive divider (e.g., R1 = 100kΩ, R2 = 900kΩ) to scale 5V down to 500mV at ADJ. Resistor tolerances ≤0.1% are recommended for accurate trip-point setting per the Applications Information section.
What is the minimum operating voltage for LTC2911HDDB-4#TRPBF to guarantee PFO high-state operation?
The LTC2911HDDB-4#TRPBF guarantees PFO high-state operation down to VCC = 2.3V, as specified in the Electrical Characteristics table under "VCC,OP Minimum Operating Voltage to Guarantee PFO High". Below 2.3V, PFO may not reliably assert high even if PFI > 515mV.
How does the TMR latch function work on LTC2911HDDB-4#TRPBF during margin testing?
When TMR is pulled to GND, the LTC2911HDDB-4#TRPBF latches the current RST state - holding it regardless of subsequent input voltage changes. Upon releasing TMR (e.g., returning to high-impedance or V1), RST resumes normal operation after propagation delay tP,LR (≤3µs). This enables controlled voltage stress testing without unintended system resets.
LTC2911HDDB-4#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:
- 1.122V, 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-4#TRPBF FAQ
1.How can I place an order for LTC2911HDDB-4#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2911HDDB-4#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-4#TRPBF reliable?
The price and inventory of LTC2911HDDB-4#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-4#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2911HDDB-4#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2911HDDB-4#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2911HDDB-4#TRPBF?
LTC2911HDDB-4#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2911HDDB-4#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-4#TRPBF?
For technical support, including LTC2911HDDB-4#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2911HDDB-4#TRPBF requirements.
6.How does Aetrix verify that LTC2911HDDB-4#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2911HDDB-4#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-4#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2911HDDB-4#TRPBF?
All LTC2911HDDB-4#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2911HDDB-4#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-4#TRPBF part is unused and in its original packaging.
Return procedure for LTC2911HDDB-4#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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