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Analog Devices Inc. LTC2911IDDB-4#TRPBF
- Part No.:
- LTC2911IDDB-4#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC2911IDDB-4#TRPBF.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,668
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Product details
Overview
LTC2911IDDB-4#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), 1.2V (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 industrial embedded systems.
For engineers reviewing the LTC2911IDDB-4#TRPBF datasheet, LTC2911IDDB-4#TRPBF pinout, LTC2911IDDB-4#TRPBF application, or LTC2911IDDB-4#TRPBF equivalent, key selection criteria include its 1.2V fixed V2 threshold, DFN-8 (3mm × 2mm) package, PFI-configurable early-warning power-fail signaling, and TMR-latch capability for margin testing under controlled voltage stress.
Technical Context
The LTC2911IDDB-4#TRPBF implements three independent voltage comparators: V1 (3.3V, –6.5% trip), V2 (1.2V, –6.5% trip), and ADJ (0.5V nominal 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 propagation delay, followed by timeout validation. The TMR pin supports three modes: external capacitor timing (9.4ms/nF), internal 200ms timeout (TMR = V1), or latch mode (TMR = GND), enabling flexible system-level reset coordination and margin testing without hardware changes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| V1 Threshold | 3.086V ±1.5% - guarantees reliable 3.3V supply monitoring across full temperature range |
| V2 Threshold | 1.122V ±1.5% - fixed 1.2V supply monitoring with tight tolerance for low-voltage rails |
| ADJ Threshold | 500mV ±1.5% - enables resistive divider configuration of third supply trip point |
| PFI Threshold | 500mV falling / 515mV rising - provides 3% hysteresis for robust early-warning power-fail signaling |
| Reset Timeout | 200ms internal or 15–27ms external (CTMR = 2.2nF) - configurable delay prevents spurious resets during supply ramp |
| Supply Current | 30µA typical - ultra-low quiescent draw extends battery life in always-on monitoring applications |
| Operating Temp | –40°C to +85°C - qualified for industrial environments with no derating required |
Pinout & Package
Package: 8-lead (3mm × 2mm) plastic DFN with exposed pad (pin 9, GND). Compact footprint suits space-constrained PCB layouts while providing low thermal resistance (θJA = 76°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (PFI) | Power-fail input | Accepts resistive divider output; triggers PFO low at 500mV falling edge for early warning |
| 2 (ADJ) | Adjustable monitor input | 0.5V threshold comparator for third supply; supports resistor-divider configuration |
| 3 (TMR) | Reset timeout/latch control | Selects internal 200ms timeout (TMR = V1) or latches RST state (TMR = GND) |
| 4 (GND) | Device ground | Reference for all analog inputs and digital outputs; exposed pad must be connected to PCB GND |
| 5 (RST) | Reset logic output | Open-drain output pulled low when any monitored supply fails; weak internal pull-up to V1 |
| 6 (PFO) | Power-fail logic output | Open-drain early-warning signal; asserts low before RST to enable controlled shutdown |
| 7 (V1) | 3.3V monitor input & supply | Primary 3.3V rail monitor; supplies internal VCC when V1 > V2; requires 0.1µF bypass |
| 8 (V2) | 1.2V monitor input & supply | Fixed 1.2V rail monitor; contributes to VCC generation only if V2 > V1; bypass required |
Key Features
| Feature | Design Value |
|---|---|
| Triple simultaneous monitoring | Monitors 3.3V, 1.2V, and adjustable supply independently with single IC-reduces BOM count and layout area |
| ±1.5% threshold accuracy | Minimizes required voltage margin in system design; eliminates need for external trimming resistors in most applications |
| Configurable reset timeout | Internal 200ms option saves external capacitor; external timing allows precise adjustment from ~0.4ms to >1s |
| Power-fail early warning | PFO output signals low before RST assertion-enables firmware-triggered save/sequence operations prior to hard reset |
| TMR latch for margin testing | Holding TMR low freezes RST state regardless of input conditions-simplifies voltage stress testing without system reboot |
Applications
| Industrial PLC Power Sequencing | Automotive Body Control Module |
|---|---|
Use Scenario: Monitoring 3.3V microcontroller core, 1.2V FPGA I/O, and 5V CAN transceiver supply in a programmable logic controller. IC Role / Device Role / Timing Role: LTC2911IDDB-4#TRPBF acts as centralized supply supervisor ensuring all rails are stable before releasing reset to MCU and FPGA. Use Value: Prevents lockup during brown-out by asserting RST only after all three supplies meet ±1.5% threshold accuracy and sustain 200ms timeout. | Use Scenario: Supervising 3.3V infotainment SoC, 1.2V memory interface, and 12V battery-derived 5V supply in a body control unit. IC Role / Device Role / Timing Role: LTC2911IDDB-4#TRPBF monitors primary rails while PFI tracks battery voltage via resistive divider to trigger PFO warning before RST. Use Value: Enables 50ms+ advance warning via PFO to initiate EEPROM save and graceful shutdown before 12V battery collapse causes hard reset. |
| Network Equipment Line Card | Medical Diagnostic Imaging Subsystem |
Use Scenario: Validating 3.3V PHY, 1.2V SerDes, and adjustable 2.5V analog front-end supply on a 10G Ethernet line card. IC Role / Device Role / Timing Role: LTC2911IDDB-4#TRPBF serves as fault-tolerant power monitor with ADJ configured for 2.5V rail using precision resistor divider. Use Value: ±1.5% threshold accuracy ensures compliance with IEEE 802.3ap power integrity requirements without overspecifying supply tolerances. | Use Scenario: Ensuring clean power-up of 3.3V sensor interface, 1.2V ADC core, and adjustable 1.8V reference supply in MRI subsystem timing board. IC Role / Device Role / Timing Role: LTC2911IDDB-4#TRPBF provides latched reset (TMR = GND) during factory calibration to prevent unintended reset during voltage margining. Use Value: Eliminates need for external test fixtures-engineers apply variable DC to rails while holding RST state constant for repeatable parametric testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6314US29D3+ | Fixed 2.93V reset threshold; no adjustable ADJ input; no PFI/PFO power-fail channel | Single-rail monitoring only; lacks early-warning capability and third supply flexibility | Choose only if system requires only 3.3V supervision and no power-fail signaling |
| TPS3808G33DBVR | Single 3.3V monitor with programmable delay; no V2/ADJ inputs; no PFI comparator | Cannot monitor 1.2V or adjustable rail simultaneously; no early-warning output | Select when only basic 3.3V reset is needed and board space permits multiple discrete supervisors |
Compared with MAX6314US29D3+ and TPS3808G33DBVR, the LTC2911IDDB-4#TRPBF uniquely integrates triple-rail monitoring, ±1.5% accuracy, and PFI-based early-warning in a single DFN-8 package-reducing component count, PCB area, and qualification effort for multi-rail industrial systems.
Availability
LTC2911IDDB-4#TRPBF is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control modules, network line cards, and medical imaging subsystems requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LTC2911IDDB-4#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 and maintains full product support, documentation, and manufacturing continuity for the LTC portfolio.
The LTC2911 family is designed for high-accuracy, low-power supply monitoring in industrial, automotive, and communications equipment where reliable power sequencing and early-failure detection are critical.
FAQ
What is the exact V2 supply threshold for LTC2911IDDB-4#TRPBF?
The LTC2911IDDB-4#TRPBF has a fixed V2 threshold of 1.122V ±1.5%, corresponding to a nominal 1.2V supply with –6.5% trip point. This value is guaranteed over the full –40°C to +85°C operating temperature range and is documented in the Electrical Characteristics table under VRT12 parameter. The part marking "LFPM" on the device confirms the -4 variant.
Does LTC2911IDDB-4#TRPBF support external reset timeout configuration?
Yes, LTC2911IDDB-4#TRPBF supports both internal and external reset timeout. Connecting the TMR pin to V1 enables the factory-trimmed 200ms internal timeout. For custom delays, connect a capacitor from TMR to GND: CTMR = tRST × 106.5 pF/ms (e.g., 2.2nF yields ~23ms). Leakage must stay below 500nA to maintain accuracy.
How does the PFI input function in LTC2911IDDB-4#TRPBF?
The PFI input in LTC2911IDDB-4#TRPBF is a dedicated power-fail monitor with 500mV falling-edge threshold and 515mV rising-edge threshold, providing 15mV hysteresis. When a resistive divider applies a voltage below 500mV to PFI, the PFO output pulls low-delivering early warning of impending supply failure before V1/V2/ADJ thresholds are violated.
Can LTC2911IDDB-4#TRPBF operate with VCC below 1V?
Yes, LTC2911IDDB-4#TRPBF guarantees RST and PFO output functionality down to VCC = 0.5V. Its proprietary low-voltage drive circuitry maintains valid logic states during power-up and brown-out conditions, preventing indeterminate outputs that could cause system lockup. This is confirmed in the Absolute Maximum Ratings and Applications Information sections.
What package type is used for LTC2911IDDB-4#TRPBF?
LTC2911IDDB-4#TRPBF uses an 8-lead (3mm × 2mm) plastic DFN package with exposed thermal pad (pin 9, GND). The "DDB" in the part number explicitly denotes this package, which offers θJA = 76°C/W-significantly better thermal performance than the TSOT-23 option-and is RoHS-compliant with lead-free (PBF) finish.
LTC2911IDDB-4#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:
- 1.122V, 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#TRPBF FAQ
1.How can I place an order for LTC2911IDDB-4#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2911IDDB-4#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-4#TRPBF reliable?
The price and inventory of LTC2911IDDB-4#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-4#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2911IDDB-4#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2911IDDB-4#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2911IDDB-4#TRPBF?
LTC2911IDDB-4#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2911IDDB-4#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-4#TRPBF?
For technical support, including LTC2911IDDB-4#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2911IDDB-4#TRPBF requirements.
6.How does Aetrix verify that LTC2911IDDB-4#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2911IDDB-4#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-4#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2911IDDB-4#TRPBF?
All LTC2911IDDB-4#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2911IDDB-4#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-4#TRPBF part is unused and in its original packaging.
Return procedure for LTC2911IDDB-4#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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