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Analog Devices Inc. LTC2911CDDB-3#TRPBF
- Part No.:
- LTC2911CDDB-3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC2911CDDB-3#TRPBF.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,883
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Product details
Overview
LTC2911CDDB-3#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), 1.8V (V2), and an adjustable input (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-3#TRPBF datasheet, LTC2911CDDB-3#TRPBF pinout, LTC2911CDDB-3#TRPBF application, or LTC2911CDDB-3#TRPBF equivalent, this page delivers verified functional identity, DFN-8 package mapping, confirmed 3.3V/1.8V/ADJ monitoring roles, glitch-immune timing behavior, and two validated alternative parts with documented technical and application differences.
Technical Context
The LTC2911CDDB-3#TRPBF implements three independent voltage comparators - one fixed at 3.086V (V1), one fixed at 1.683V (V2), and one adjustable via external divider with 500mV nominal threshold (ADJ) - all sharing ±1.5% accuracy across temperature. Its PFI comparator provides early power-fail warning with 500mV falling / 515mV rising thresholds and 15mV typical hysteresis.
Reset assertion is synchronized to a timeout period selectable between internal 200ms (TMR tied to V1) or external capacitor (e.g., 2.2nF → 20ms). The TMR pin also enables latch mode: pulling it to GND freezes RST state, enabling margin testing without spurious resets during supply stress.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| V1 Threshold | 3.086V ±1.5% - precisely monitors 3.3V supply at –6.5% tolerance, preventing false resets within 5% supply band |
| V2 Threshold | 1.683V ±1.5% - factory-configured for 1.8V supply monitoring per LTC2911-3 variant |
| ADJ Threshold | 500mV ±7.5mV - enables resistive-divider configuration of third supply trip point with tight hysteresis |
| Reset Timeout | 200ms internal (TMR = V1) or 15–27ms external (CTMR = 2.2nF) - ensures stable system boot before releasing RST |
| Supply Current | 30µA typical - ultra-low quiescent draw from V1/V2, critical for battery-backed or always-on monitoring |
| PFO Propagation Delay | 8–80µs - fast response to PFI voltage drop below 500mV, enabling timely shutdown initiation |
| Operating Temp | 0°C to 70°C - commercial-grade thermal range suitable for desktop, industrial control, and network infrastructure |
Pinout & Package
Package: 8-lead (3mm × 2mm) plastic DFN (DDB), exposed pad (Pin 9) connected to GND for thermal and electrical integrity. θJA = 76°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PFI | Power-fail input | Monitors external supply via resistive divider; asserts PFO low when voltage falls below 500mV (falling edge) |
| ADJ | Adjustable monitor input | High-impedance 500mV comparator input; enables third supply threshold configuration using resistor divider |
| TMR | Reset timeout/latch control | Selects internal 200ms timeout (tie to V1) or external capacitor timing; pull to GND to latch RST state |
| GND | Device ground reference | Primary return path for all comparators, outputs, and internal circuitry; exposed pad must be connected |
| V2 | 1.8V supply monitor input | Fixed –6.5% undervoltage detector for 1.8V rail; draws ≤10µA input current at 25°C |
| V1 | 3.3V supply monitor & power source | Fixed –6.5% detector for 3.3V rail; supplies internal VCC and drives RST/PFO pull-ups |
| PFO | Power-fail logic output | Open-drain output pulled low on PFI under-voltage; weak internal pull-up to V1 (29µA typ) |
| RST | Reset logic output | Open-drain reset signal asserted low if any monitored supply drops below threshold; same pull-up as PFO |
Key Features
| Feature | Design Value |
|---|---|
| Triple simultaneous monitoring | Independent 3.3V (V1), 1.8V (V2), and adjustable (ADJ) inputs enable full-system supply supervision in single IC |
| ±1.5% threshold accuracy | Guaranteed over full 0°C–70°C range eliminates need for design margin beyond supply tolerance, improving system reliability |
| Configurable reset timeout | Internal 200ms or external capacitor (9.4ms/nF) allows optimization for boot time vs. noise immunity without BOM change |
| Power-fail early warning | PFI/PFO path provides dedicated 500mV threshold with 15mV hysteresis for controlled shutdown before main supply collapse |
| Latch-mode margin testing | TMR pin pull-to-GND freezes RST state, enabling safe voltage stress testing without unintended system reset |
Applications
| Network Server Power Sequencing | Industrial PLC I/O Module Supervision |
|---|---|
Use Scenario: Coordinating startup of CPU, memory, and peripheral rails in multi-rail server power supplies. IC Role / Device Role / Timing Role: Monitors 3.3V core, 1.8V I/O, and adjustable 12V auxiliary rail; asserts RST only after all three remain valid for 200ms. Use Value: Prevents firmware execution on unstable rails; PFO triggers graceful OS shutdown if 12V input sags prior to 3.3V/1.8V collapse. |
Use Scenario: Ensuring deterministic reset behavior during brown-out conditions in programmable logic controller backplanes. IC Role / Device Role / Timing Role: Supervises 3.3V FPGA config, 1.8V transceiver, and ADJ-monitored 24V field bus; latches RST during margin test sweeps. Use Value: Eliminates spurious resets during transient dips; ±1.5% accuracy avoids false trips within 5% industrial supply tolerance. |
| Notebook Battery Management System | Automotive Infotainment Head Unit |
Use Scenario: Monitoring Li-ion stack voltage, 3.3V SoC supply, and 1.8V display interface in portable computing. IC Role / Device Role / Timing Role: Uses PFI to track battery pack voltage via divider; triggers PFO interrupt before V1/V2 undervoltage causes RST. Use Value: Enables 500ms+ save-to-flash window before forced reset; 0.5V VCC operation prevents floating outputs during deep discharge. |
Use Scenario: Securing boot integrity in automotive head units with multiple DC/DC rails and CAN communication. IC Role / Device Role / Timing Role: Watches 3.3V MCU core, 1.8V GPU, and ADJ-configured 5V CAN transceiver supply; uses internal 200ms timeout for cold-start compliance. Use Value: Meets AEC-Q100 Grade 3 thermal requirements (0°C–70°C); PFO provides CAN bus shutdown signal before main processor reset. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6369KA+T | Fixed 3.3V/2.5V/1.2V thresholds; no ADJ input; 200ms fixed timeout only; ±2.5% accuracy | Lacks configurable third threshold and latch mode; suited for simpler dual-rail + fixed auxiliary monitoring | Choose when 1.8V monitoring is not required and design prioritizes lower cost over flexibility |
| TPS3808G33DBVR | Single 3.3V monitor only; no V2/ADJ inputs; 200ms/300ms selectable timeout; ±0.5% accuracy | Requires two additional ICs to replicate triple-monitor function; higher accuracy but no power-fail comparator | Choose only for 3.3V-only applications where ±0.5% threshold precision outweighs integration loss |
Compared with MAX6369KA+T and TPS3808G33DBVR, the LTC2911CDDB-3#TRPBF uniquely integrates 3.3V/1.8V/ADJ monitoring, power-fail warning, and latch-mode testing in one DFN-8 package - reducing board area, BOM count, and validation effort for complex multi-rail systems.
Availability
LTC2911CDDB-3#TRPBF is available at Aetrix Electronics and suitable for network servers, industrial PLC modules, and automotive infotainment head units requiring stable component supply, guaranteed lead-free finish (PBF), and commercial-temperature-grade reliability.
Supply support for LTC2911CDDB-3#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) designs high-performance analog, mixed-signal, and digital signal processing components for precision measurement, power management, and connectivity applications.
The LTC2911 family - now part of ADI's supervisory IC portfolio - was engineered specifically for high-accuracy, low-power triple-supply monitoring in space-constrained computing and industrial systems where ±1.5% threshold stability and power-fail predictability are critical.
FAQ
What is the exact supply voltage monitoring configuration of the LTC2911CDDB-3#TRPBF?
The LTC2911CDDB-3#TRPBF is the LTC2911-3 variant, configured to monitor 3.3V on V1 (3.086V threshold), 1.8V on V2 (1.683V threshold), and an adjustable input on ADJ (500mV threshold). This matches the "3.3V, 1.8V, ADJ" product selection guide entry and is confirmed by its part marking LFPJ in the official datasheet.
Does the LTC2911CDDB-3#TRPBF support internal reset timeout without external components?
Yes. The LTC2911CDDB-3#TRPBF supports an internally generated 200ms reset timeout period when the TMR pin is tied directly to V1. This eliminates the need for an external timing capacitor and simplifies layout for standard boot timing requirements.
Can the LTC2911CDDB-3#TRPBF operate reliably during power-up when VCC is below 1V?
Yes. The LTC2911CDDB-3#TRPBF guarantees RST and PFO output functionality down to VCC = 0.5V, using proprietary low-voltage drive circuitry. This ensures clean, deterministic reset signaling even during deep brown-out or slow-ramp power-up sequences.
How does the power-fail comparator in the LTC2911CDDB-3#TRPBF differ from the main supply monitors?
The LTC2911CDDB-3#TRPBF's PFI comparator has a dedicated 500mV falling-edge / 515mV rising-edge threshold with 15mV hysteresis, optimized for early warning of primary supply collapse. Unlike V1/V2/ADJ comparators, it drives the separate PFO output and supports resistive divider configuration for flexible trip-point setting.
Is the exposed pad on the LTC2911CDDB-3#TRPBF's DFN package electrically connected?
Yes. The exposed pad (Pin 9) on the LTC2911CDDB-3#TRPBF's 3mm × 2mm DFN package is internally connected to GND. Per the datasheet, PCB connection is optional but strongly recommended for optimal thermal performance (θJA = 76°C/W) and electrical stability.
LTC2911CDDB-3#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:
- 1.683V, 3.086V, 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-3#TRPBF FAQ
1.How can I place an order for LTC2911CDDB-3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2911CDDB-3#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-3#TRPBF reliable?
The price and inventory of LTC2911CDDB-3#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-3#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2911CDDB-3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2911CDDB-3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2911CDDB-3#TRPBF?
LTC2911CDDB-3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2911CDDB-3#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-3#TRPBF?
For technical support, including LTC2911CDDB-3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2911CDDB-3#TRPBF requirements.
6.How does Aetrix verify that LTC2911CDDB-3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2911CDDB-3#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-3#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2911CDDB-3#TRPBF?
All LTC2911CDDB-3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2911CDDB-3#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-3#TRPBF part is unused and in its original packaging.
Return procedure for LTC2911CDDB-3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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