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Analog Devices Inc. LTC2911IDDB-2#TRMPBF
- Part No.:
- LTC2911IDDB-2#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC2911IDDB-2#TRMPBF.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,703
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Product details
Overview
LTC2911IDDB-2#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), 2.5V (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-2#TRMPBF datasheet, LTC2911IDDB-2#TRMPBF pinout, LTC2911IDDB-2#TRMPBF application, or LTC2911IDDB-2#TRMPBF equivalent, this page delivers verified specifications, validated DFN-8 pin functions, real-world use cases in industrial computing and battery-backed systems, and two confirmed alternative parts with documented functional and parametric differences.
Technical Context
The LTC2911IDDB-2#TRMPBF implements three independent voltage comparators - one fixed 3.086V threshold on V1, one fixed 2.338V threshold on V2 (for 2.5V nominal supply), and one 500mV threshold on ADJ - all with tight ±1.5% accuracy across temperature. Its internal VCC is derived from the higher of V1 or V2, enabling operation even when one supply is absent.
A dedicated PFI/PFO path provides early power-fail warning via a 500mV falling-edge threshold with 15mV hysteresis; TMR pin supports three modes: external capacitor timing, internal 200ms timeout (TMR = V1), or latch mode (TMR = GND) for margin testing without system reset.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| V1 Threshold | 3.086V ±1.5% - guarantees reliable 3.3V supply monitoring across full industrial temperature range |
| V2 Threshold | 2.338V ±1.5% - precisely tracks 2.5V supply at –6.5% tolerance for LTC2911-2 variant |
| ADJ Threshold | 500mV ±1.5% - enables configurable third supply monitoring via resistive divider |
| PFI Threshold | 500mV falling / 515mV rising - provides noise-immune early warning of primary supply collapse |
| Reset Timeout | 200ms internal (TMR = V1) - eliminates external capacitor while ensuring sufficient de-bounce delay |
| Supply Current | 30µA typical - enables always-on monitoring in low-power industrial and portable systems |
| Min Operating VCC | 0.5V - ensures RST/PFO remain valid during brown-out and ultra-low-voltage power-up |
Pinout & Package
Package: 8-lead (3mm × 2mm) plastic DFN with exposed pad (GND). RoHS-compliant, lead-free finish (PBF), 500-piece tape-and-reel (#TRMPBF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - PFI | Power-fail input | Monitors primary supply via resistive divider; triggers PFO low at 500mV falling edge |
| 2 - ADJ | Adjustable monitor input | High-impedance 500mV comparator input for third supply configuration |
| 3 - TMR | Reset timeout/latch control | Set to V1 for 200ms internal timeout; pulled to GND to latch RST state |
| 4 - GND | Device ground | Reference for all analog inputs and outputs; exposed pad must be connected to PCB ground |
| 5 - RST | Reset logic output | Open-drain output pulled low when any monitored supply falls below threshold |
| 6 - PFO | Power-fail logic output | Open-drain output pulled low on PFI under-voltage; provides early shutdown signal |
| 7 - V1 | 3.3V supply monitor & power source | Fixed 3.086V threshold input; supplies internal VCC along with V2 |
| 8 - V2 | 2.5V supply monitor & power source | Fixed 2.338V threshold input; powers internal circuitry when > V1 |
Key Features
| Feature | Design Value |
|---|---|
| Triple simultaneous monitoring | Simultaneously validates 3.3V, 2.5V, and adjustable supply - eliminates need for multiple discrete supervisors |
| ±1.5% threshold accuracy | Reduces required system voltage margin by >2× vs. ±3% parts, improving design headroom for tight-tolerance rails |
| Configurable reset timeout | Internal 200ms option saves board space and BOM cost versus external RC timing networks |
| Power-fail early warning | PFO asserts before RST, enabling controlled shutdown (e.g., NMI-driven save-to-EEPROM) prior to system reset |
| Latch mode for margin testing | TMR = GND holds RST state indefinitely - simplifies voltage stress testing without unintended resets |
Applications
| Industrial PLC Power Sequencing | Battery-Backed Data Logger |
|---|---|
Use Scenario: Monitoring 3.3V I/O rail, 2.5V FPGA core rail, and backup Li-ion stack voltage in programmable logic controller. IC Role / Device Role / Timing Role: Triple-supply supervisor ensures safe boot only after all rails are stable; PFO warns of battery sag before main supply collapse. Use Value: Prevents firmware corruption during brown-out by triggering EEPROM save before RST assertion. | Use Scenario: Continuous environmental sensor node powered by primary DC supply with Li-ion backup. IC Role / Device Role / Timing Role: Monitors 3.3V system rail, 2.5V ADC reference, and ADJ-configured battery voltage; PFO initiates data flush on battery dip. Use Value: Enables deterministic shutdown sequence with <200ms window between PFO alert and RST assertion. |
| Network Edge Router Power Management | Automotive Infotainment Module |
Use Scenario: Validating 3.3V SoC interface rail, 2.5V PHY rail, and adjustable 1.8V memory rail in compact edge networking hardware. IC Role / Device Role / Timing Role: Ensures synchronized power-up of multi-rail subsystems; TMR latch used for factory voltage margining tests. Use Value: Eliminates need for external timing capacitor - reduces layout complexity and improves thermal stability. | Use Scenario: Monitoring 3.3V MCU rail, 2.5V display driver rail, and ADJ-configured 12V battery input in infotainment head unit. IC Role / Device Role / Timing Role: Detects battery undervoltage (via ADJ divider) and triggers graceful UI shutdown before MCU reset. Use Value: Maintains RST/PFO functionality down to 0.5V VCC - prevents latch-up during cold-crank battery dips. |
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 | Monitors 3.3V/2.5V/adjustable; ±2.5% threshold accuracy; no PFI/PFO; 140ms fixed timeout | Lacks dedicated power-fail comparator and early-warning capability; requires external circuit for PFO-like function | Choose when PFO functionality is unnecessary and ±2.5% accuracy suffices for less critical systems |
| TPS3808G33DBVR | Single 3.3V monitor; ±0.5% accuracy; no V2/ADJ inputs; 200ms timeout; no PFI/PFO | Only monitors one rail; cannot replace triple-monitoring function without adding two more ICs | Select only for simplified single-rail designs where multi-supply coordination is handled externally |
Compared with MAX6369AUT+T and TPS3808G33DBVR, the LTC2911IDDB-2#TRMPBF uniquely integrates triple-rail monitoring, ±1.5% accuracy, and PFI/PFO early-warning in a single DFN-8 package - reducing component count, PCB area, and system-level timing uncertainty.
Availability
LTC2911IDDB-2#TRMPBF is available at Aetrix Electronics and suitable for industrial PLCs, battery-backed data loggers, network edge routers, and automotive infotainment modules requiring stable component supply and long-term lifecycle support.
Supply support for LTC2911IDDB-2#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 (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC2911 family was designed specifically for precision multi-rail power supervision in space-constrained industrial and computing systems - emphasizing accuracy, low quiescent current, and integrated fault signaling.
FAQ
What is the exact V2 threshold voltage for LTC2911IDDB-2#TRMPBF?
The LTC2911IDDB-2#TRMPBF has a guaranteed V2 threshold of 2.338V ±1.5% over –40°C to 85°C, corresponding to a –6.5% trip point for a nominal 2.5V supply. This value is specified in the Electrical Characteristics table under VRT25 parameter and applies across the full industrial temperature range.
Does LTC2911IDDB-2#TRMPBF require an external capacitor for reset timeout?
No - LTC2911IDDB-2#TRMPBF supports an internal 200ms reset timeout when the TMR pin is tied to V1. An external capacitor is optional and only needed if a different timeout period (e.g., 20ms with 2.2nF) is required. The internal option eliminates BOM and layout overhead.
How does the PFI input function in LTC2911IDDB-2#TRMPBF?
The PFI input in LTC2911IDDB-2#TRMPBF compares the applied voltage to a 500mV falling-edge threshold (with 15mV hysteresis), causing PFO to assert low. It is intended for monitoring primary system supplies (e.g., DC/DC input or battery stack) via a resistive divider, delivering early warning before RST activates.
Can LTC2911IDDB-2#TRMPBF monitor a 1.8V supply on the V2 pin?
No - LTC2911IDDB-2#TRMPBF is the -2 variant, configured specifically for 2.5V on V2. For 1.8V monitoring, the correct part is LTC2911IDDB-3#TRMPBF. The V2 threshold is factory-set per variant and not user-adjustable; using the wrong variant risks incorrect reset behavior.
What is the minimum operating voltage that maintains RST/PFO functionality in LTC2911IDDB-2#TRMPBF?
LTC2911IDDB-2#TRMPBF guarantees RST and PFO output functionality down to VCC = 0.5V, enabling robust operation during severe brown-out conditions and ultra-low-voltage power-up sequences where other supervisors fail.
LTC2911IDDB-2#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:
- 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#TRMPBF FAQ
1.How can I place an order for LTC2911IDDB-2#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2911IDDB-2#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-2#TRMPBF reliable?
The price and inventory of LTC2911IDDB-2#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-2#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC2911IDDB-2#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2911IDDB-2#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2911IDDB-2#TRMPBF?
LTC2911IDDB-2#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2911IDDB-2#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-2#TRMPBF?
For technical support, including LTC2911IDDB-2#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2911IDDB-2#TRMPBF requirements.
6.How does Aetrix verify that LTC2911IDDB-2#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC2911IDDB-2#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-2#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC2911IDDB-2#TRMPBF?
All LTC2911IDDB-2#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2911IDDB-2#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-2#TRMPBF part is unused and in its original packaging.
Return procedure for LTC2911IDDB-2#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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