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Analog Devices Inc. LTC2911CDDB-4
- Part No.:
- LTC2911CDDB-4
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC2911CDDB-4.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,503
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Product details
Overview
LTC2911CDDB-4 from Analog Devices (formerly Linear Technology) is a precision triple supply monitor IC with power-fail comparator, designed for systems requiring simultaneous monitoring of 3.3V, 1.2V, and an adjustable supply. It delivers ±1.5% threshold accuracy over 0°C to 70°C, 30µA typical quiescent current, and supports internal 200ms or external capacitor–programmable reset timeout. Used in industrial power sequencing and embedded control where reliable undervoltage detection is critical.
For engineers reviewing the LTC2911CDDB-4 datasheet, LTC2911CDDB-4 pinout, LTC2911CDDB-4 application, or LTC2911CDDB-4 equivalent, key selection criteria include its fixed 3.3V/1.2V dual-supply monitoring configuration, 0.5V ADJ threshold, PFI-based early power-fail warning, latch-enabled margin testing, and DFN-8 (3mm × 2mm) package compatibility with space-constrained PCB layouts.
Technical Context
The LTC2911CDDB-4 integrates three independent voltage comparators: V1 monitors 3.3V at 3.086V (−6.5%), V2 monitors 1.2V at 1.122V (−6.5%), and ADJ monitors an external supply via resistive divider with 500mV nominal threshold. All comparators feature 1.5% accuracy across temperature and built-in glitch filtering for noise immunity.
Its power-fail function uses the PFI input (500mV falling / 515mV rising threshold) to drive PFO low before system supplies collapse, enabling controlled shutdown. The TMR pin supports three modes: internal 200ms timeout (TMR = V1), external RC timeout (TMR to GND), or latched RST state (TMR = GND), simplifying margin testing without hardware changes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| V1 Threshold | 3.086V (−6.5% of 3.3V); guarantees reset assertion before 3.3V rail drops below safe logic level |
| V2 Threshold | 1.122V (−6.5% of 1.2V); precise undervoltage detection for low-voltage digital cores |
| ADJ Threshold | 500mV ±7.5mV; enables configurable third supply monitoring via resistor divider |
| PFI Threshold | 500mV falling / 515mV rising; provides hysteresis for stable early-warning power-fail signaling |
| Quiescent Current | 30µA typical; minimizes loading on monitored supplies during normal operation |
| Reset Timeout | 200ms internal or 15–27ms external (CTMR = 2.2nF); ensures sufficient hold time for processor initialization |
| Operating Temp | 0°C to 70°C (Commercial grade); validated for stable performance in office and industrial ambient environments |
| Supply Range | V1/V2/ADJ/PFI: −0.3V to 6.5V; supports wide input flexibility and fault-tolerant design margins |
Pinout & Package
Package: 8-lead (3mm × 2mm) plastic DFN with exposed pad (Pin 9, optional GND connection). Thermal resistance θJA = 76°C/W enables reliable operation in compact, thermally constrained layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PFI | Power-fail input | Monitors primary supply via resistive divider; triggers PFO low at 500mV falling edge for early warning |
| ADJ | Adjustable monitor input | High-impedance 500mV comparator input; sets third trip point using external resistor network |
| TMR | Reset timeout/latch control | Selects internal 200ms timeout (TMR = V1), external RC timing (TMR to GND), or RST latch (TMR = GND) |
| GND | Device ground reference | Common return path for all analog and digital circuitry; exposed pad enhances thermal dissipation |
| V2 | 1.2V supply monitor input | Dedicated −6.5% threshold (1.122V) for 1.2V rails; bypass with ≥0.1µF capacitor |
| V1 | 3.3V supply monitor input | Dedicated −6.5% threshold (3.086V); powers internal circuitry and provides pull-up for RST/PFO |
| PFO | Power-fail logic output | Open-drain output pulled up to V1; asserts low on PFI < 500mV to initiate controlled shutdown |
| RST | Reset logic output | Open-drain output pulled up to V1; asserts low if any monitored supply falls below threshold |
Key Features
| Feature | Design Value |
|---|---|
| Triple simultaneous monitoring | Independent 3.3V, 1.2V, and adjustable supply detection eliminates need for multiple discrete supervisors |
| ±1.5% threshold accuracy | Reduces required voltage margin by >2× vs. ±3% parts, improving system reliability under supply tolerance variation |
| Configurable power-fail warning | PFI input with 15mV hysteresis enables precise early-warning threshold setting for DC/DC inputs or battery stacks |
| Reset latch mode | TMR pin grounding freezes RST state, allowing stable margin testing without spurious resets during voltage sweeps |
| Low 30µA quiescent current | Minimizes impact on battery-backed or energy-sensitive systems while maintaining full monitoring functionality |
| DFN-8 package | 3mm × 2mm footprint saves >40% board area vs. SOIC-8; exposed pad improves thermal performance in dense layouts |
Applications
| Industrial PLC Power Sequencing | Embedded Edge Controller Monitoring |
|---|---|
Use Scenario: Monitoring 3.3V I/O, 1.2V FPGA core, and 5V auxiliary supply in programmable logic controllers during cold start and brownout conditions. IC Role / Device Role / Timing Role: LTC2911CDDB-4 acts as centralized supply supervisor, asserting RST only after all three rails stabilize for ≥200ms and issuing PFO warning when main 24V-to-5V DC/DC output dips. Use Value: Prevents firmware corruption by ensuring CPU reset occurs only after stable power; PFO-triggered watchdog reset avoids lockup during transient line sags. | Use Scenario: Validating voltage integrity in fanless edge gateways with 3.3V MCU, 1.2V AI accelerator, and adjustable 1.8V sensor interface rail. IC Role / Device Role / Timing Role: LTC2911CDDB-4 continuously monitors all rails, uses ADJ pin to track 1.8V via resistor divider, and latches RST during factory margin testing using TMR pin. Use Value: Enables production-line voltage stress testing without modifying PCB layout; ±1.5% thresholds ensure pass/fail limits match spec sheet requirements. |
| Automotive Body Control Module | Network Equipment Power Management |
Use Scenario: Supervising 3.3V microcontroller, 1.2V CAN transceiver, and adjustable 5V LIN bus supply in automotive body control units operating from 12V battery with wide temperature swings. IC Role / Device Role / Timing Role: LTC2911CDDB-4 provides reset coordination across domains, with PFI tied to battery-sensed voltage to warn of impending ignition-off condition. Use Value: Extends safe shutdown window by 50ms via PFO alert, allowing EEPROM save before VBAT collapse; C-grade temp range covers cabin ambient requirements. | Use Scenario: Ensuring clean startup of 3.3V management ASIC, 1.2V SerDes PHY, and adjustable 2.5V PoE controller in enterprise switches. IC Role / Device Role / Timing Role: LTC2911CDDB-4 validates rail sequencing order and duration, using internal 200ms timeout to meet IEEE 802.3af power-up timing compliance. Use Value: Eliminates need for external RC timing components; ADJ pin flexibility supports future PHY voltage revisions without hardware change. |
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+T | Fixed 2.93V reset threshold; single-supply monitor only; no PFI or ADJ capability | Suitable only for basic 3.3V monitoring; lacks triple-input architecture and power-fail warning | Select only if system requires minimal BOM count and has no need for 1.2V or early-warning functions |
| TPS3808G33DBVR | Single 3.3V supervisor; 200ms fixed timeout; no V2/ADJ/PFI inputs; higher 45µA quiescent current | Cannot monitor 1.2V rail or provide power-fail signaling; limited to simple reset generation | Choose when cost sensitivity outweighs multi-rail supervision needs and PFO functionality is unnecessary |
Compared with MAX6314US29D3+T and TPS3808G33DBVR, the LTC2911CDDB-4 uniquely integrates triple-supply monitoring, programmable power-fail warning, and latch-enabled margin testing in a single DFN-8 package-reducing component count by 2–3 devices while enabling advanced power management features essential for complex embedded systems.
Availability
LTC2911CDDB-4 is available at Aetrix Electronics and suitable for industrial PLCs, embedded edge controllers, automotive body control modules, and network equipment requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LTC2911CDDB-4 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 technologies, serving industrial, automotive, communications, and healthcare markets.
The LTC2911 family was developed by Linear Technology (acquired by ADI in 2017) to deliver ultra-accurate, low-power supply monitoring for mission-critical embedded systems where voltage margining, early power-fail detection, and compact packaging are essential.
FAQ
What is the exact reset threshold voltage for the V2 pin on the LTC2911CDDB-4?
The V2 pin on the LTC2911CDDB-4 has a guaranteed reset threshold of 1.122V (−6.5% of 1.2V) with ±1.5% accuracy over 0°C to 70°C. This value is fixed per the -4 variant and applies to all operating conditions - no external configuration is needed. The LTC2911CDDB-4 datasheet specifies min/max bounds of 1.104V to 1.140V across temperature and process variation.
Does the LTC2911CDDB-4 support external capacitor–programmed reset timeout?
Yes, the LTC2911CDDB-4 supports external reset timeout via a capacitor connected between the TMR pin and GND. With CTMR = 2.2nF, the timeout is 15–27ms (typical 20ms). The relationship is linear: CTMR ≈ tRST × 106.5 pF/ms. The LTC2911CDDB-4 also supports internal 200ms timeout when TMR is tied to V1, offering design flexibility without additional components.
How does the PFI input function in the LTC2911CDDB-4, and what voltage triggers PFO?
The PFI input on the LTC2911CDDB-4 monitors an external voltage (e.g., main DC/DC input or battery stack) through a resistive divider. PFO asserts low when PFI falls below 500mV (falling threshold) and deasserts when PFI rises above 515mV (rising threshold), providing 15mV hysteresis. This behavior is fixed and identical across all LTC2911 variants, including the LTC2911CDDB-4.
Can the LTC2911CDDB-4 monitor a 1.8V supply instead of the specified 1.2V on V2?
No - the LTC2911CDDB-4 is factory-configured for 1.2V on V2. To monitor 1.8V, the LTC2911CDDB-3 (marked LFPM → LFPJ) must be used. The -4 suffix explicitly denotes the 1.2V V2 option; changing the monitored voltage requires selecting the correct variant. The LTC2911CDDB-4's V2 comparator is trimmed to 1.122V and cannot be reconfigured.
What is the purpose of the ADJ pin on the LTC2911CDDB-4, and how is it used?
The ADJ pin on the LTC2911CDDB-4 is a high-impedance input with a 500mV nominal threshold, enabling monitoring of a third supply (e.g., 5V, 2.5V, or custom voltage) via an external resistive divider. For example, to monitor 5V, use R1 = 100kΩ and R2 = 768kΩ to set trip at 4.675V. The LTC2911CDDB-4's ADJ input draws only ±15nA, minimizing divider error and supporting accurate threshold setting.
LTC2911CDDB-4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x2)
LTC2911CDDB-4 FAQ
1.How can I place an order for LTC2911CDDB-4 through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2911CDDB-4 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-4 reliable?
The price and inventory of LTC2911CDDB-4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2911CDDB-4 is usually 5 days.
3.What payment methods are accepted for LTC2911CDDB-4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2911CDDB-4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2911CDDB-4?
LTC2911CDDB-4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2911CDDB-4 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-4?
For technical support, including LTC2911CDDB-4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2911CDDB-4 requirements.
6.How does Aetrix verify that LTC2911CDDB-4 is sourced from the original manufacturer or authorized distributors?
All LTC2911CDDB-4 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-4 meets industry standards.
7.What is the process for return or replacement of LTC2911CDDB-4?
All LTC2911CDDB-4 units undergo pre-shipment inspection (PSI). If there is an issue with LTC2911CDDB-4, 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-4 part is unused and in its original packaging.
Return procedure for LTC2911CDDB-4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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