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Analog Devices Inc. LTC2911CDDB-1#TRPBF
- Part No.:
- LTC2911CDDB-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC2911CDDB-1#TRPBF.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,426
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Product details
Overview
LTC2911CDDB-1#TRPBF from Analog Devices (acquired Linear Technology) is a precision triple supply monitor IC with integrated power-fail comparator and latched reset control. It monitors 3.3V (V1), 5V (V2), and an adjustable supply (ADJ) with ±1.5% threshold accuracy over 0°C to 70°C, supports internal 200ms reset timeout, and operates down to 0.5V VCC for reliable power-up sequencing in embedded systems.
For engineers reviewing the LTC2911CDDB-1#TRPBF datasheet, LTC2911CDDB-1#TRPBF pinout, LTC2911CDDB-1#TRPBF application, or LTC2911CDDB-1#TRPBF equivalent, key selection criteria include its fixed 3.3V/5V monitoring pair, DFN-8 (3mm × 2mm) package, PFI-configurable early power-fail warning, TMR-latch capability for margin testing, and guaranteed operation at ultralow 0.5V supply voltage.
Technical Context
The LTC2911CDDB-1#TRPBF implements three independent voltage comparators - one fixed at 3.086V (V1), one fixed at 4.675V (V2 for 5V supply), and one adjustable via external resistor divider on ADJ with 500mV nominal threshold. All comparators feature 1.5% accuracy across temperature and built-in glitch filtering for noise immunity.
Its power-fail function uses a dedicated PFI input with 500mV falling-edge threshold and 15mV hysteresis, driving the open-drain PFO output for early warning. The RST output is latched via TMR pin pulled to GND, enabling controlled system margining without unintended resets during voltage stress tests.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| V1 Threshold | 3.086V ±1.5% - precisely monitors 3.3V supply at –6.5% undervoltage for reliable reset assertion |
| V2 Threshold | 4.675V ±1.5% - fixed 5V supply monitor per LTC2911-1 variant, ensuring compatibility with standard logic rails |
| ADJ Threshold | 500mV ±1.5% - enables configurable third supply monitoring using external resistive divider |
| PFI Threshold | 500mV falling / 515mV rising - provides 3% hysteresis for robust early power-fail detection |
| Reset Timeout | 200ms internal (TMR = V1) or 15–27ms external (CTMR = 2.2nF) - eliminates need for external timing components in most designs |
| Supply Current | 30µA typical - ultra-low quiescent draw minimizes impact on battery-backed or low-power systems |
| Min Operating VCC | 0.5V guaranteed - ensures valid RST/PFO logic states even during brown-out or deep power-down |
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-density PCB layouts with minimal thermal derating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (PFI) | Power-Fail Input | Monitors external supply via resistive divider; triggers PFO low at 500mV falling edge for early warning |
| 2 (ADJ) | Adjustable Monitor Input | Configurable third supply threshold (500mV nominal); requires external divider for voltage scaling |
| 3 (TMR) | Reset Timeout & Latch Control | Set to V1 for 200ms internal timeout; pull to GND to latch RST state for margin testing |
| 4 (GND) | Device Ground | Reference for all analog inputs and digital outputs; exposed pad may be connected to PCB ground plane |
| 5 (RST) | Reset Output | Open-drain output asserting low when any monitored supply falls below threshold; weak internal pull-up to V1 |
| 6 (PFO) | Power-Fail Output | Open-drain early-warning signal; asserts low when PFI < 500mV, deasserts at 515mV for hysteresis |
| 7 (V1) | 3.3V Supply Monitor & Power Source | Fixed 3.3V monitor input; supplies internal VCC and RST/PFO pull-up current |
| 8 (V2) | 5V Supply Monitor & Power Source | Fixed 5V monitor input; contributes to internal VCC generation (higher of V1/V2) |
Key Features
| Feature | Design Value |
|---|---|
| Triple simultaneous monitoring | Simultaneously supervises 3.3V, 5V, and adjustable supply - eliminates need for multiple discrete supervisors |
| ±1.5% threshold accuracy | Reduces required system voltage margin by >2× vs. ±3% parts, improving reliability under supply tolerance variation |
| Ultralow 0.5V VCC operation | Guarantees valid RST/PFO logic states during brown-out, enabling safe power-up sequencing in Li-ion or energy-harvesting systems |
| Configurable power-fail warning | PFI input with 500mV threshold allows precise early shutdown signaling before critical supplies collapse |
| Reset latch via TMR pin | Pulling TMR to GND freezes RST state - simplifies production margin testing without hardware modifications |
Applications
| Server Power Sequencing | Industrial PLC I/O Module |
|---|---|
Use Scenario: Coordinating startup of CPU, memory, and peripheral rails in 1U network servers with tight voltage tolerances. IC Role / Device Role / Timing Role: Triple-supply monitor enforcing strict 3.3V/5V/adjustable rail sequencing and detecting pre-failure conditions on main DC/DC input. Use Value: Prevents boot failures by asserting RST only after all rails stabilize above thresholds for ≥200ms, while PFO initiates graceful shutdown if primary 12V rail drops. | Use Scenario: Monitoring isolated 24V field power, 5V logic, and 3.3V FPGA core in harsh industrial environments. IC Role / Device Role / Timing Role: Simultaneous supervision of three critical rails with ±1.5% accuracy, plus PFI-based early warning on 24V input before brown-out affects I/O drivers. Use Value: Enables deterministic fault response: RST halts processor execution on undervoltage, while PFO triggers watchdog reset or nonvolatile save before loss of communication. |
| Automotive Infotainment Head Unit | Battery-Powered Medical Sensor |
Use Scenario: Ensuring clean power-up of display controller, audio codec, and microcontroller in automotive-grade infotainment systems. IC Role / Device Role / Timing Role: Monitors 3.3V MCU core, 5V display interface, and adjustable 1.8V sensor rail; uses TMR latch to validate voltage margins during ESD testing. Use Value: Eliminates false resets during cold-crank transients by combining glitch filtering, accurate thresholds, and latched RST behavior during voltage stress. | Use Scenario: Supervising Li-ion battery pack (via PFI divider), regulated 3.3V system rail, and adjustable 1.2V ADC reference in portable diagnostic equipment. IC Role / Device Role / Timing Role: Provides dual-level protection: RST prevents operation below safe battery voltage, while PFO initiates data save to flash before shutdown. Use Value: Guarantees functional safety down to 0.5V VCC - maintains valid reset signaling even as battery discharges to end-of-life voltage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326–33D2+T | Fixed 3.3V/3.3V/adj triple monitor; no PFI input; 200ms fixed timeout only; SOT23-6 package | Lacks power-fail warning and adjustable V2; suitable only where dual 3.3V rails require monitoring | Select only if PFI functionality is unnecessary and board space favors smaller SOT23-6 footprint |
| TPS3808G33DBVR | Single 3.3V supervisor; no V2/ADJ/PFI support; 200ms timeout; 5-pin SOT23 | Requires two additional ICs to match LTC2911CDDB-1#TRPBF's triple-monitor + PFI capability | Use only in cost-sensitive, single-rail applications where multi-rail supervision is handled externally |
Compared with MAX6326–33D2+T and TPS3808G33DBVR, the LTC2911CDDB-1#TRPBF delivers integrated triple-supply monitoring with power-fail warning and latch capability in a single DFN-8 package - reducing BOM count, PCB area, and design complexity for systems requiring coordinated rail supervision and early failure detection.
Availability
LTC2911CDDB-1#TRPBF is available at Aetrix Electronics and suitable for server power sequencing, industrial PLC I/O modules, automotive infotainment head units, and battery-powered medical sensors requiring stable component supply across extended product lifecycles.
Supply support for LTC2911CDDB-1#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 technologies, serving industrial, automotive, communications, and healthcare markets.
The LTC2911 family was designed by Linear Technology (now part of ADI) specifically for precision multi-rail power monitoring in space-constrained, high-reliability systems - emphasizing ±1.5% threshold accuracy, ultralow-voltage operation, and integrated power-fail warning.
FAQ
What is the exact V2 supply voltage monitored by the LTC2911CDDB-1#TRPBF?
The LTC2911CDDB-1#TRPBF is the LTC2911-1 variant, which monitors a fixed 5V supply on the V2 pin with a nominal reset threshold of 4.675V (–6.5% of 5V) and ±1.5% accuracy over 0°C to 70°C. This is confirmed in the Product Selection Guide and Electrical Characteristics table under VRT50 parameter.
Does the LTC2911CDDB-1#TRPBF support external reset timeout configuration?
Yes, the LTC2911CDDB-1#TRPBF supports both internal and external reset timeout. Connecting the TMR pin to V1 enables the factory-trimmed 200ms timeout. For custom delays, connect a capacitor (e.g., 2.2nF) between TMR and GND to achieve 15–27ms timeout, as specified in the tRST(EXT) parameter.
How does the PFI input function in the LTC2911CDDB-1#TRPBF?
The PFI input in the LTC2911CDDB-1#TRPBF provides early power-fail detection with a 500mV falling-edge threshold and 15mV hysteresis. When the voltage at PFI drops below 500mV (set via external resistor divider), the PFO output pulls low - signaling imminent supply collapse before V1/V2/ADJ thresholds are violated.
Can the LTC2911CDDB-1#TRPBF operate with supply voltages below 1V?
Yes, the LTC2911CDDB-1#TRPBF guarantees functional operation down to 0.5V VCC, meaning both RST and PFO outputs maintain valid logic states (low/high) even as the internal supply derived from V1/V2 collapses. This is explicitly stated in the Absolute Maximum Ratings and Electrical Characteristics sections.
What is the purpose of the TMR pin on the LTC2911CDDB-1#TRPBF?
The TMR pin on the LTC2911CDDB-1#TRPBF serves dual functions: (1) setting reset timeout period (open = ~400µs, tied to V1 = 200ms, capacitor to GND = programmable delay), and (2) latching the RST output state when pulled to GND - enabling margin testing without triggering unwanted system resets.
LTC2911CDDB-1#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:
- 3.086V, 4.675V, Adj
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- Adjustable/Selectable
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x2)
LTC2911CDDB-1#TRPBF FAQ
1.How can I place an order for LTC2911CDDB-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2911CDDB-1#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 LTC2911CDDB-1#TRPBF reliable?
The price and inventory of LTC2911CDDB-1#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2911CDDB-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2911CDDB-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2911CDDB-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2911CDDB-1#TRPBF?
LTC2911CDDB-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2911CDDB-1#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 LTC2911CDDB-1#TRPBF?
For technical support, including LTC2911CDDB-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2911CDDB-1#TRPBF requirements.
6.How does Aetrix verify that LTC2911CDDB-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2911CDDB-1#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 LTC2911CDDB-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2911CDDB-1#TRPBF?
All LTC2911CDDB-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2911CDDB-1#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 LTC2911CDDB-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC2911CDDB-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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