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Analog Devices Inc. LTC2911IDDB-3#TRPBF
- Part No.:
- LTC2911IDDB-3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC2911IDDB-3#TRPBF.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL 8DFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LTC2911IDDB-3#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), 1.8V (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-3#TRPBF datasheet, LTC2911IDDB-3#TRPBF pinout, LTC2911IDDB-3#TRPBF application, or LTC2911IDDB-3#TRPBF equivalent, key selection criteria include its fixed 3.3V/1.8V dual-supply monitoring configuration, DFN-8 (3mm × 2mm) package with exposed pad, PFI-based early-warning power-fail signaling, and TMR-controlled latch/margining capability - all critical for industrial and computing system supervision.
Technical Context
The LTC2911IDDB-3#TRPBF implements three independent voltage comparators: V1 (3.3V nominal, –6.5% trip), V2 (1.8V nominal, –6.5% trip), and ADJ (0.5V threshold). Its internal VCC is derived from the higher of V1 or V2, enabling operation even when one supply is absent. The PFI comparator provides 500mV falling-edge threshold with 15mV hysteresis for noise-immune power-fail detection.
Reset assertion requires all monitored inputs to remain below threshold for ≥8µs (tUV), followed by a timeout period (200ms internal or externally set via TMR capacitor). The RST output features weak internal pull-up to V1 (29µA typical), while PFO provides identical drive strength and early-warning logic - both functional down to VCC = 0.5V for robust low-voltage operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| V1 Threshold | 3.086V (3.3V – 6.5%), guaranteed ±1.5% over –40°C to 85°C - ensures precise undervoltage detection without margin inflation |
| V2 Threshold | 1.683V (1.8V – 6.5%), ±1.5% accuracy - matches common core rail tolerances for reliable SoC/FPGA power sequencing |
| ADJ Threshold | 500mV ±7.5mV - enables configurable third-rail monitoring via resistive divider (e.g., 12V, 24V, or battery stack) |
| PFI Threshold | 500mV falling edge, 515mV rising edge (3% hysteresis) - rejects noise while providing deterministic early-warning signal before main rails collapse |
| Reset Timeout | Internally fixed 200ms (TMR tied to V1) - eliminates external timing capacitor, reducing BOM count and layout sensitivity |
| Supply Current | 30µA typical at 25°C - enables always-on supervision in battery-backed or energy-constrained systems |
| Operating Temp | –40°C to +85°C (I-grade) - qualified for industrial and automotive under-hood environments |
Pinout & Package
Package: 8-lead (3mm × 2mm) plastic DFN with exposed pad (pin 9 = GND, optional PCB connection). Compact footprint suits space-constrained PCBs in servers, notebooks, and industrial controllers.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PFI | Power-fail input | Monitors primary supply via resistive divider; asserts PFO low at 500mV falling edge for early shutdown warning |
| ADJ | Adjustable monitor input | 0.5V threshold comparator for third rail; supports custom trip points (e.g., 5V, 12V) using external resistor network |
| 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 comparators and digital outputs; exposed pad improves thermal performance (θJA = 76°C/W) |
| V2 | 1.8V supply monitor input | Dedicated –6.5% threshold (1.683V) for core logic rails; high-impedance input minimizes loading on sensitive LDO outputs |
| V1 | 3.3V supply monitor input & VCC source | Primary supervisor rail and internal power source; bypass with ≥0.1µF capacitor for stability |
| PFO | Power-fail open-drain output | Asserts low on PFI threshold breach; weak internal pull-up to V1 (29µA); compatible with 3.3V/5V logic interfaces |
| RST | Reset open-drain output | Asserts low if V1, V2, or ADJ falls below threshold; same drive as PFO; latched via TMR for production test margining |
Key Features
| Feature | Design Value |
|---|---|
| Triple simultaneous monitoring | Independent 3.3V, 1.8V, and adjustable thresholds eliminate need for multiple discrete supervisors |
| ±1.5% threshold accuracy | Reduces required system voltage margin by >2% vs. ±2.5% parts - enables tighter supply design and lower-cost regulators |
| Ultralow VCC operation (0.5V) | Guarantees RST/PFO logic states during brown-out and power-up - prevents processor lockup or undefined I/O behavior |
| Configurable power-fail warning | PFI input with 3% hysteresis allows programmable early-warning threshold for controlled shutdown (e.g., NV memory save) |
| Reset latch for margin testing | TMR pin pull-down holds RST state indefinitely - simplifies production validation at reduced supply voltages without hardware mods |
Applications
| Server Power Sequencing | Industrial PLC Supervision |
|---|---|
|
Use Scenario: Monitoring 3.3V auxiliary, 1.8V FPGA core, and 24V field bus supply in rack-mounted server backplane. IC Role / Device Role / Timing Role: Triple-supply monitor ensuring correct power-up order and detecting premature rail collapse before CPU initialization. Use Value: Prevents boot failure by asserting RST until all rails stabilize; PFO triggers graceful shutdown when 24V bus drops below 22V (via PFI divider). |
Use Scenario: Supervising 3.3V microcontroller, 1.8V sensor interface, and 12V actuator supply in factory-floor PLC. IC Role / Device Role / Timing Role: Fault-detection hub that latches RST during voltage margin tests and signals PFO on main 12V supply sag. Use Value: Enables in-system validation at 90% nominal voltage without false resets; PFO interrupt initiates emergency I/O freeze before brown-out. |
| Automotive Infotainment | Notebook Battery Management |
|
Use Scenario: Validating 3.3V MCU, 1.8V display controller, and adjustable battery pack voltage (via ADJ) in head-unit ECU. IC Role / Device Role / Timing Role: Safety-critical supervisor ensuring all domains power up correctly before CAN communication starts. Use Value: ±1.5% accuracy guarantees reset at exactly 3.086V/1.683V - avoids nuisance resets in wide-temp automotive environment. |
Use Scenario: Monitoring 3.3V system rail, 1.8V SSD interface, and Li-ion stack voltage (via ADJ) in ultrabook platform. IC Role / Device Role / Timing Role: Dual-role supervisor: RST enforces clean boot; PFO warns of battery depletion before OS-level low-battery alert. Use Value: 200ms internal timeout eliminates timing capacitor; PFO's 500mV threshold maps to ~3.0V/cell for accurate end-of-discharge detection. |
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/1.2V thresholds; no adjustable ADJ input; 140ms timeout; ±2.0% accuracy | Lacks configurability for non-standard rails; less accurate threshold reduces design margin | Choose only if exact 2.5V/1.2V monitoring is required and ADJ flexibility is unnecessary |
| TPS3808G33DBVR | Single 3.3V monitor; no V2/ADJ inputs; 200ms timeout; ±0.5% accuracy; SOT-23-6 | Requires two additional ICs to match LTC2911IDDB-3#TRPBF's triple-monitor function | Select when only 3.3V supervision is needed and board space permits multi-IC solution |
Compared with MAX6369KA21+T and TPS3808G33DBVR, the LTC2911IDDB-3#TRPBF delivers integrated triple-rail monitoring with adjustable third input, superior ±1.5% accuracy, and latch-enabled margin testing - reducing component count, improving reliability, and simplifying validation in complex power architectures.
Availability
LTC2911IDDB-3#TRPBF is available at Aetrix Electronics and suitable for industrial PLCs, automotive infotainment systems, server backplanes, and notebook battery management requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
Supply support for LTC2911IDDB-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 (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and computing markets.
The LTC2911 family was designed specifically for precision multi-rail power supervision in mission-critical systems where voltage margin, temperature stability, and low-power operation are essential - exemplified by the LTC2911IDDB-3#TRPBF's 1.8V/3.3V fixed configuration and industrial temperature grade.
FAQ
What is the exact V2 supply threshold for LTC2911IDDB-3#TRPBF?
The LTC2911IDDB-3#TRPBF has a fixed V2 threshold of 1.683V (1.8V – 6.5%), specified with ±1.5% accuracy over –40°C to +85°C. This value is confirmed in the Electrical Characteristics table for the LTC2911-3 variant, which corresponds to the "-3" suffix in the part number and matches the DDB package and I-grade temperature range of the LTC2911IDDB-3#TRPBF.
Does LTC2911IDDB-3#TRPBF require an external capacitor for reset timeout?
No - the LTC2911IDDB-3#TRPBF uses an internally generated 200ms reset timeout when the TMR pin is tied to V1, eliminating the need for an external timing capacitor. This is explicitly supported per the "PRODUCT SELECTION GUIDE" and "ELECTRICAL CHARACTERISTICS" (tRST(INT) = 140–280ms, typ. 200ms), simplifying layout and improving timing consistency across units.
How does the PFI input function in LTC2911IDDB-3#TRPBF?
In the LTC2911IDDB-3#TRPBF, the PFI input monitors an external voltage (e.g., main DC bus or battery) via a resistive divider and asserts the PFO output low when the divided voltage falls below 500mV (falling edge). Its 15mV hysteresis (500mV/515mV) prevents chatter during noisy transitions, enabling reliable early-warning signaling for controlled system shutdown before critical rails fail.
Can LTC2911IDDB-3#TRPBF monitor a 5V supply?
No - the LTC2911IDDB-3#TRPBF is the -3 variant, configured specifically for 3.3V (V1) and 1.8V (V2) monitoring. To monitor 5V, select the LTC2911IDDB-1#TRPBF (-1 variant), which specifies V2 = 5V with 4.675V threshold. Using the -3 variant for 5V would require external level-shifting and forfeit guaranteed accuracy.
What is the purpose of the exposed pad on the DFN package of LTC2911IDDB-3#TRPBF?
The exposed pad (pin 9) on the LTC2911IDDB-3#TRPBF's DFN package is internally connected to GND and serves as a thermal and electrical enhancement. While optional for PCB connection, soldering it to a thermal pad significantly lowers junction-to-ambient thermal resistance (θJA = 76°C/W vs. 195°C/W for TSOT-23), improving reliability in sustained high-temperature operation typical of industrial and automotive applications.
LTC2911IDDB-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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x2)
LTC2911IDDB-3#TRPBF FAQ
1.How can I place an order for LTC2911IDDB-3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2911IDDB-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 LTC2911IDDB-3#TRPBF reliable?
The price and inventory of LTC2911IDDB-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 LTC2911IDDB-3#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2911IDDB-3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2911IDDB-3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2911IDDB-3#TRPBF?
LTC2911IDDB-3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2911IDDB-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 LTC2911IDDB-3#TRPBF?
For technical support, including LTC2911IDDB-3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2911IDDB-3#TRPBF requirements.
6.How does Aetrix verify that LTC2911IDDB-3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2911IDDB-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 LTC2911IDDB-3#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2911IDDB-3#TRPBF?
All LTC2911IDDB-3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2911IDDB-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 LTC2911IDDB-3#TRPBF part is unused and in its original packaging.
Return procedure for LTC2911IDDB-3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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