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Analog Devices Inc. LTC2911IDDB-2#TRPBF
- Part No.:
- LTC2911IDDB-2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC2911IDDB-2#TRPBF.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,832
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Product details
Overview
LTC2911IDDB-2#TRPBF from Analog Devices (formerly Linear Technology) is a precision triple supply monitor IC with integrated power-fail comparator and latched reset control. It monitors 3.3V (V1), 2.5V (V2), and an adjustable supply (ADJ) with ±1.5% threshold accuracy over –40°C to 85°C, supports internal 200ms reset timeout, and operates down to 0.5V VCC for reliable power-up sequencing in industrial embedded systems.
For engineers reviewing the LTC2911IDDB-2#TRPBF datasheet, LTC2911IDDB-2#TRPBF pinout, LTC2911IDDB-2#TRPBF application, or LTC2911IDDB-2#TRPBF equivalent, key selection criteria include its dual fixed/adjustable voltage monitoring architecture, PFI-based early power-fail warning capability, TMR latch function for margin testing, and DFN-8 (3mm × 2mm) package compatibility with space-constrained PCB layouts.
Technical Context
The LTC2911IDDB-2#TRPBF implements three independent voltage comparators: one fixed 3.3V monitor (V1), one fixed 2.5V monitor (V2), and one adjustable 0.5V-threshold input (ADJ) configurable via resistive divider. All comparators feature 1.5% threshold accuracy across temperature and built-in glitch filtering for noise immunity.
Its power-fail comparator uses the PFI input with 500mV falling-edge threshold and 515mV rising-edge threshold (3% hysteresis) to drive the open-drain PFO output. The TMR pin enables internal 200ms timeout (when tied to V1), external capacitor timing, or latched RST state for system margining - all without external components beyond dividers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| V1 Threshold | 3.086V ±1.5% - precisely monitors 3.3V supplies within 5% tolerance band without false resets |
| V2 Threshold | 2.338V ±1.5% - factory-set for 2.5V rail monitoring per LTC2911-2 variant |
| ADJ Threshold | 500mV ±1.5% - enables configurable third supply monitoring via external resistor divider |
| PFI Threshold | 500mV falling / 515mV rising - provides hysteresis for robust early-warning power-fail detection |
| Reset Timeout | 200ms internal (TMR = V1) - eliminates need for external timing capacitor in standard configurations |
| Supply Current | 30µA typical - enables low-power operation in battery-backed or always-on systems |
| Min VCC | 0.5V guaranteed - ensures valid RST/PFO logic states during brown-out and power-up ramping |
Pinout & Package
Package: 8-Lead (3mm × 2mm) Plastic DFN with exposed pad (pin 9 = GND, optional PCB connection).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PFI | Power-fail input | Monitors system primary supply via resistive divider; triggers PFO low at 500mV falling edge |
| ADJ | Adjustable monitor input | 0.5V threshold input for third supply; requires external divider to set trip point |
| TMR | Reset timeout/latch control | Tied to V1 → 200ms internal timeout; pulled to GND → latches RST state for margin testing |
| GND | Device ground | Reference for all analog inputs and digital outputs; exposed pad must be connected to PCB ground plane |
| V2 | 2.5V supply monitor | Fixed 2.338V threshold input; powers internal circuitry when > V1 in LTC2911-2 configuration |
| V1 | 3.3V supply monitor | Fixed 3.086V threshold input; primary power source for internal VCC and RST/PFO pull-ups |
| PFO | Power-fail output | Open-drain output asserting low on PFI under-voltage; provides early warning before RST activation |
| RST | Reset output | Open-drain reset signal active low when any monitored supply falls below threshold |
Key Features
| Feature | Design Value |
|---|---|
| Triple simultaneous monitoring | Simultaneously supervises 3.3V, 2.5V, and adjustable rails with independent comparators and thresholds |
| ±1.5% threshold accuracy | Guaranteed over full –40°C to +85°C range - reduces system voltage margin requirements by 50% vs ±3% supervisors |
| Configurable power-fail warning | PFI input with 3% hysteresis enables precise early shutdown signaling before critical supply collapse |
| Latched reset for margin testing | TMR pin allows RST state hold during voltage stress tests - eliminates spurious resets during validation |
| Ultralow operating voltage | Valid RST/PFO operation down to 0.5V VCC prevents indeterminate logic states during brown-out conditions |
Applications
| Industrial PLC Power Sequencing | Automotive Body Control Module |
|---|---|
Use Scenario: Monitoring 3.3V microcontroller core, 2.5V sensor interface, and 12V battery-derived auxiliary rail in programmable logic controllers. IC Role / Device Role / Timing Role: Triple-supply supervisor ensuring synchronized power-up of CPU, peripherals, and I/O drivers before firmware execution. Use Value: Prevents lockup during cold-start by guaranteeing all rails stabilize above thresholds for ≥200ms before releasing RST. | Use Scenario: Supervising 3.3V infotainment MCU, 2.5V CAN transceiver, and 5V lighting driver in automotive body electronics. IC Role / Device Role / Timing Role: Power-fail detector using PFI to monitor 12V battery via resistive divider, triggering PFO before main supplies collapse. Use Value: Enables 100ms+ controlled shutdown window for EEPROM save operations prior to complete power loss. |
| Network Equipment Hot-Swap Control | Medical Diagnostic Imaging PSU |
Use Scenario: Validating 3.3V FPGA configuration, 2.5V memory interface, and adjustable 1.8V I/O rail in modular telecom line cards. IC Role / Device Role / Timing Role: ADJ input configured to monitor hot-swap controller enable signal; RST held until safe insertion detected. Use Value: Eliminates need for discrete timing RC networks - single IC satisfies triple-rail sequencing and insertion safety checks. | Use Scenario: Monitoring isolated 3.3V digital control, 2.5V analog front-end, and adjustable high-voltage bias supply in MRI subsystems. IC Role / Device Role / Timing Role: TMR pin latched during calibration to prevent reset assertion during transient voltage excursions. Use Value: Enables deterministic margin testing at ±5% supply variation without hardware rework or additional test fixtures. |
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 | Single 3.3V monitor with watchdog timer; no dual fixed/adjustable rail support or PFI input | Lacks triple-monitoring capability and power-fail warning; suitable only for basic reset generation | Select only if system requires watchdog functionality and monitors only one supply |
| TPS3808G33DBVR | Single 3.3V supervisor with adjustable delay; no V2/ADJ/PFI inputs or latch mode | Cannot replace triple-monitoring function; requires additional ICs for multi-rail supervision | Choose only for cost-sensitive designs with single-rail requirements and no power-fail detection |
Compared with MAX6369AUT+T and TPS3808G33DBVR, the LTC2911IDDB-2#TRPBF uniquely integrates three independent voltage monitors, a dedicated power-fail comparator with hysteresis, and latched reset control in a single DFN-8 package - eliminating BOM count, layout area, and timing coordination overhead required by multi-IC solutions.
Availability
LTC2911IDDB-2#TRPBF is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control modules, network equipment hot-swap systems, and medical diagnostic imaging power supplies requiring stable component supply and long-term lifecycle support.
Supply support for LTC2911IDDB-2#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC2911 family was designed specifically for precision multi-rail power monitoring in mission-critical embedded systems where reliability, accuracy, and minimal external components are essential.
FAQ
What is the exact V2 threshold voltage for LTC2911IDDB-2#TRPBF?
The LTC2911IDDB-2#TRPBF has a factory-configured V2 threshold of 2.338V ±1.5% over –40°C to +85°C, corresponding to a nominal 2.5V supply with –6.5% trip point. This value is specified in the Electrical Characteristics table under VRT25 parameter and applies exclusively to the LTC2911-2 variant, which LTC2911IDDB-2#TRPBF implements.
How does the TMR pin function in LTC2911IDDB-2#TRPBF for reset timeout control?
In LTC2911IDDB-2#TRPBF, the TMR pin selects reset behavior: tied to V1 enables internal 200ms timeout; connected to GND latches the current RST state indefinitely; left open yields ~400µs minimum timeout; and connected to GND via capacitor sets external timeout (9.4ms/nF). This eliminates external timing components while supporting margin testing.
Can LTC2911IDDB-2#TRPBF monitor a 1.8V supply on the V2 pin?
No - LTC2911IDDB-2#TRPBF is the LTC2911-2 variant, factory-set for 2.5V monitoring on V2. To monitor 1.8V, use LTC2911IDDB-3#TRPBF (LTC2911-3 variant) with 1.683V ±1.5% threshold. The V2 threshold is fixed per part number and cannot be reconfigured in-circuit.
What is the purpose of the PFI input and how is it used in LTC2911IDDB-2#TRPBF?
The PFI input in LTC2911IDDB-2#TRPBF provides early power-fail detection by comparing a divided-down system supply (e.g., 12V battery) against a 500mV threshold. When PFI falls below this level, PFO asserts low - giving the system time to execute shutdown routines before V1/V2 collapse and trigger RST.
Does LTC2911IDDB-2#TRPBF require external pull-up resistors on RST and PFO pins?
LTC2911IDDB-2#TRPBF provides weak internal pull-ups to V1 (~29µA at 3.3V), sufficient for light loads. External pull-ups are recommended when driving heavy capacitive loads or when VOH > V1 is required - e.g., interfacing with 5V logic. The internal pull-up ensures basic functionality but external resistors improve rise time and voltage margin.
LTC2911IDDB-2#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:
- 2.338V, 3.086V, Adj
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- Adjustable/Selectable
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x2)
LTC2911IDDB-2#TRPBF FAQ
1.How can I place an order for LTC2911IDDB-2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2911IDDB-2#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 LTC2911IDDB-2#TRPBF reliable?
The price and inventory of LTC2911IDDB-2#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2911IDDB-2#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2911IDDB-2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2911IDDB-2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2911IDDB-2#TRPBF?
LTC2911IDDB-2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2911IDDB-2#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 LTC2911IDDB-2#TRPBF?
For technical support, including LTC2911IDDB-2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2911IDDB-2#TRPBF requirements.
6.How does Aetrix verify that LTC2911IDDB-2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2911IDDB-2#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 LTC2911IDDB-2#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2911IDDB-2#TRPBF?
All LTC2911IDDB-2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2911IDDB-2#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 LTC2911IDDB-2#TRPBF part is unused and in its original packaging.
Return procedure for LTC2911IDDB-2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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