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Analog Devices Inc. LTC2911IDDB-4#TRMPBF
- Part No.:
- LTC2911IDDB-4#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC2911IDDB-4#TRMPBF.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,791
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Product details
Overview
LTC2911IDDB-4#TRMPBF 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), 1.2V (V2), and an adjustable input (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 embedded power management systems.
For engineers reviewing the LTC2911IDDB-4#TRMPBF datasheet, LTC2911IDDB-4#TRMPBF pinout, LTC2911IDDB-4#TRMPBF application, or LTC2911IDDB-4#TRMPBF equivalent, key selection criteria include its fixed 1.2V V2 threshold, DFN-8 (3mm × 2mm) package, PFI/PFO early-warning capability, TMR latch function for margin testing, and guaranteed operation at ultralow 0.5V supply voltage.
Technical Context
The LTC2911IDDB-4#TRMPBF implements three independent voltage comparators: V1 (3.3V, –6.5% trip = 3.086V), V2 (1.2V, –6.5% trip = 1.122V), and ADJ (0.5V nominal threshold). Its power-fail comparator uses a 500mV falling-edge threshold with 15mV hysteresis on the PFI input to generate PFO low before main supply collapse.
Reset assertion is synchronized across all three inputs with glitch-filtered propagation delay (8–80µs), while the TMR pin enables either external capacitor-based timeout (9.4ms/nF), internal 200ms mode (TMR tied to V1), or latched RST state (TMR pulled to GND). Internal VCC is derived from the higher of V1 or V2, ensuring operation during asymmetric supply ramping.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| V1 Threshold | 3.086V ±1.5% (3.3V supply monitor, guarantees reset before 3.3V −5% tolerance band) |
| V2 Threshold | 1.122V ±1.5% (1.2V supply monitor, matches LTC2911-4 variant specification) |
| ADJ Threshold | 500mV ±1.5% (adjustable input for third supply via resistive divider) |
| PFI Threshold | 500mV falling / 515mV rising (3% hysteresis for noise-immune power-fail detection) |
| Reset Timeout | 200ms internal (TMR = V1) or 15–27ms with 2.2nF external capacitor |
| Supply Current | 30µA typical (enables battery-backed or ultra-low-power monitoring) |
| Min VCC | 0.5V guaranteed (ensures valid RST/PFO logic levels during brownout) |
Pinout & Package
Package: 8-Lead (3mm × 2mm) Plastic DFN (DDB), exposed pad (Pin 9) connected to GND.
| 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 comparator for third supply; configured with external resistor divider |
| TMR | Reset timeout/latch control | Set to V1 for 200ms internal timeout; pull to GND to latch RST state for margin testing |
| GND | Device ground reference | Reference for all comparators and outputs; exposed pad must be connected to PCB ground plane |
| V2 | 1.2V supply monitor input | Fixed –6.5% threshold (1.122V) for 1.2V rail; high-impedance input draws ≤30µA |
| V1 | 3.3V supply monitor & VCC source | 3.3V –6.5% threshold (3.086V); supplies internal VCC when ≥ V2 |
| PFO | Power-fail output | Open-drain output pulled low when PFI < 500mV; provides early warning of supply collapse |
| RST | Reset logic output | Open-drain reset signal asserted low if any monitored supply falls below threshold |
Key Features
| Feature | Design Value |
|---|---|
| Triple simultaneous monitoring | Independent V1 (3.3V), V2 (1.2V), and ADJ (0.5V) comparators enable single-chip supervision of multi-rail systems |
| ±1.5% threshold accuracy | Guaranteed over full –40°C to 85°C industrial temperature range eliminates need for derating margins |
| Ultralow 0.5V VCC operation | RST and PFO maintain valid logic states down to 0.5V, preventing indeterminate behavior during brownout |
| Configurable reset timeout | Select between internal 200ms or external capacitor (9.4ms/nF) without adding external timing components |
| Power-fail early warning | PFO asserts before V1/V2/ADJ trip points, enabling controlled shutdown via processor NMI or nonvolatile memory save |
| Reset latch for margin testing | Pulling TMR to GND freezes RST state, allowing stable system operation at marginal supply voltages |
Applications
| Server Power Sequencing | Industrial PLC I/O Module |
|---|---|
Use Scenario: Monitoring 3.3V core, 1.2V FPGA I/O, and 5V auxiliary rails in 1U rack server PSU with coordinated power-up/down sequencing. IC Role / Device Role / Timing Role: Triple-supply supervisor providing synchronized RST release after all rails stabilize, with PFO signaling AC loss to initiate graceful shutdown. Use Value: Eliminates discrete reset ICs and reduces BOM count by 2–3 components while guaranteeing ±1.5% trip accuracy across temperature. | Use Scenario: Supervising 3.3V microcontroller, 1.2V ADC reference, and isolated 24V field bus supply in DIN-rail mounted PLC. IC Role / Device Role / Timing Role: Monitors critical rails and generates latched RST during factory calibration to prevent spurious resets under variable load conditions. Use Value: TMR latch function enables margin testing at 10% below nominal voltage without hardware modification. |
| Battery-Powered Medical Sensor | Automotive Infotainment Head Unit |
Use Scenario: Managing Li-ion battery stack (PFI), 3.3V MCU rail (V1), and 1.2V sensor interface rail (V2) in portable ECG device. IC Role / Device Role / Timing Role: PFO triggers low-battery interrupt before V1/V2 collapse, initiating data save to flash and safe sleep mode. Use Value: 30µA quiescent current extends battery life; 0.5V VCC operation ensures clean reset even during deep discharge. | Use Scenario: Supervising 3.3V SoC core, 1.2V GPU memory, and 5V display backlight in automotive head unit with ISO 16750-2 compliance. IC Role / Device Role / Timing Role: Triple-monitor detects undervoltage on all critical rails during cold-crank (6V battery dip) and asserts RST within 8µs. Use Value: ±1.5% threshold accuracy prevents false resets during transient dips, improving system robustness. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6369KA21+T | Fixed 3.3V/2.5V/1.8V thresholds; no adjustable ADJ input; 140ms fixed timeout | Lacks PFI/PFO early-warning and TMR latch; suitable only for basic reset without power-fail signaling | Choose when ADJ flexibility and latched margin testing are not required |
| TPS3808G33DBVR | Single 3.3V monitor; requires external circuitry for triple-rail support; 200ms timeout only | No V2/ADJ monitoring or PFI capability; needs three ICs + dividers to match LTC2911IDDB-4#TRMPBF functionality | Choose only for cost-sensitive designs where triple monitoring is implemented discretely |
Compared with MAX6369KA21+T and TPS3808G33DBVR, the LTC2911IDDB-4#TRMPBF uniquely integrates 1.2V-specific V2 monitoring, adjustable ADJ input, PFI/PFO early-warning, and TMR latch in a single DFN-8 package-reducing board area by >60% and eliminating external timing components.
Availability
LTC2911IDDB-4#TRMPBF is available at Aetrix Electronics and suitable for industrial PLCs, automotive infotainment systems, battery-powered medical sensors, and server power sequencing requiring stable component supply across extended temperature ranges.
Supply support for LTC2911IDDB-4#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, acquired Linear Technology in 2017 to expand precision power management solutions.
The LTC2911 product line delivers high-accuracy, low-power supply monitoring for mission-critical systems where ±1.5% threshold stability over temperature and ultralow-voltage operation are essential design requirements.
FAQ
What is the exact V2 threshold voltage for LTC2911IDDB-4#TRMPBF?
The LTC2911IDDB-4#TRMPBF has a fixed V2 threshold of 1.122V ±1.5% (1.2V −6.5%), confirmed in the Electrical Characteristics table for the LTC2911-4 variant. This value is guaranteed over the full –40°C to 85°C operating range and applies specifically to this part number's DFN-8 package and industrial temperature grade.
Does LTC2911IDDB-4#TRMPBF support external reset timeout configuration?
Yes, LTC2911IDDB-4#TRMPBF supports external reset timeout via a capacitor on the TMR pin. With CTMR = 2.2nF, the timeout is 15–27ms (typical 20ms). The formula CTMR = tRST × 106.5 pF/ms applies. Leaving TMR open yields ~400µs; tying TMR to V1 enables the internal 200ms timeout.
How does the PFI input function in LTC2911IDDB-4#TRMPBF?
The PFI input in LTC2911IDDB-4#TRMPBF monitors a system supply via resistive divider and compares it to a 500mV falling-edge threshold (515mV rising-edge). When PFI falls below 500mV, PFO pulls low to provide early warning of imminent power failure-enabling controlled shutdown before V1/V2/ADJ trip.
Can LTC2911IDDB-4#TRMPBF operate with VCC below 1V?
Yes, LTC2911IDDB-4#TRMPBF guarantees valid RST and PFO logic states down to 0.5V VCC, verified in the Absolute Maximum Ratings and Electrical Characteristics sections. This enables reliable reset assertion during deep brownout conditions where other supervisors fail.
What is the purpose of the TMR pin in LTC2911IDDB-4#TRMPBF?
The TMR pin in LTC2911IDDB-4#TRMPBF controls reset timeout mode and enables latch functionality: tied to V1 for 200ms internal timeout, connected to capacitor for external timeout, or pulled to GND to freeze RST state for margin testing-without requiring external logic or firmware intervention.
LTC2911IDDB-4#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:
- 1.122V, 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-4#TRMPBF FAQ
1.How can I place an order for LTC2911IDDB-4#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2911IDDB-4#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 LTC2911IDDB-4#TRMPBF reliable?
The price and inventory of LTC2911IDDB-4#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2911IDDB-4#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC2911IDDB-4#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2911IDDB-4#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2911IDDB-4#TRMPBF?
LTC2911IDDB-4#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2911IDDB-4#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 LTC2911IDDB-4#TRMPBF?
For technical support, including LTC2911IDDB-4#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2911IDDB-4#TRMPBF requirements.
6.How does Aetrix verify that LTC2911IDDB-4#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC2911IDDB-4#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 LTC2911IDDB-4#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC2911IDDB-4#TRMPBF?
All LTC2911IDDB-4#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2911IDDB-4#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 LTC2911IDDB-4#TRMPBF part is unused and in its original packaging.
Return procedure for LTC2911IDDB-4#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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