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Analog Devices Inc. LTC2911CDDB-1
- Part No.:
- LTC2911CDDB-1
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC2911CDDB-1.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,489
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Product details
Overview
LTC2911CDDB-1 from Analog Devices (formerly Linear Technology) is a precision triple supply monitor IC with integrated power-fail comparator and latched reset control, designed for reliable system supervision in space-constrained applications. It monitors 3.3V (V1), 5V (V2), and an adjustable supply (ADJ) with ±1.5% threshold accuracy over 0°C to 70°C, supports 200ms internal reset timeout, and operates down to 0.5V VCC - enabling robust power sequencing and controlled shutdown in desktop computers and industrial controllers.
For engineers reviewing the LTC2911CDDB-1 datasheet, LTC2911CDDB-1 pinout, LTC2911CDDB-1 application, or LTC2911CDDB-1 equivalent, key selection considerations include its fixed 3.3V/5V dual-supply monitoring configuration, DFN-8 (3mm × 2mm) package, PFI-adjustable power-fail warning, TMR-latch capability for margin testing, and guaranteed operation at ultralow VCC = 0.5V.
Technical Context
The LTC2911CDDB-1 implements three independent voltage comparators - one fixed at 3.086V (V1), one fixed at 4.675V (V2 for 5V option), and one adjustable via external resistor divider on ADJ with 500mV nominal threshold. Its internal VCC is derived from the higher of V1 or V2, enabling autonomous operation without external bias.
A dedicated power-fail comparator monitors PFI with 500mV falling-edge threshold and 515mV rising-edge threshold (3% hysteresis), driving open-drain PFO for early warning. The RST output is latched via TMR pin pulled to GND, and reset timeout is selectable between internal 200ms or external capacitor (e.g., 2.2nF → 20ms).
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 | 4.675V ±1.5% - precisely tracks –5% undervoltage condition on 5V rail |
| ADJ Threshold | 500mV ±1.5% - enables configurable third supply monitoring via resistive divider |
| PFI Threshold | 500mV falling / 515mV rising - provides noise-immune power-fail detection with built-in hysteresis |
| Reset Timeout | 200ms internal or 15–27ms external (CTMR = 2.2nF) - ensures sufficient hold time before system release |
| Supply Current | 30µA typical - minimizes loading on monitored rails during normal operation |
| Min VCC Operation | 0.5V guaranteed - maintains valid RST/PFO logic states during deep brownout |
Pinout & Package
Package: 8-Lead (3mm × 2mm) Plastic DFN (DDB), exposed pad (Pin 9) connected to GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PFI | Power-fail input | Monitors external supply via resistive divider; triggers PFO low when voltage falls below 500mV |
| ADJ | Adjustable monitor input | Accepts 0.5V threshold comparator input; configured with external resistor divider for third supply |
| TMR | Reset timeout/latch control | Connect to V1 for 200ms internal timeout; pull to GND to latch RST state for margin testing |
| GND | Device ground reference | Common return path for all analog and digital circuitry; exposed pad must be grounded |
| V2 | 5V supply monitor input | Fixed 4.675V threshold comparator input for 5V rail; also supplies internal VCC when > V1 |
| V1 | 3.3V supply monitor input | Fixed 3.086V threshold comparator input; primary VCC source if ≥ V2; requires 0.1µF bypass |
| PFO | Power-fail open-drain output | Asserts low on PFI undervoltage; weak internal pull-up to V1 (29µA typical); supports external pull-up |
| RST | Reset open-drain output | Asserts low if any monitored supply (V1/V2/ADJ) falls below threshold; latched by TMR; same drive as PFO |
Key Features
| Feature | Design Value |
|---|---|
| Triple simultaneous monitoring | Simultaneously supervises 3.3V, 5V, and adjustable supply with independent comparators and glitch filtering |
| ±1.5% threshold accuracy | Guaranteed over 0°C to 70°C - reduces system voltage margin requirements and prevents false resets |
| Configurable power-fail warning | PFI input with 500mV/515mV thresholds enables early system shutdown before critical supply collapse |
| Latched reset for margin testing | TMR pin allows RST state to be held indefinitely - simplifies validation under marginal supply conditions |
| Ultralow-voltage operation | Valid RST/PFO outputs down to VCC = 0.5V - ensures deterministic behavior during brownout recovery |
Applications
| Desktop Computer Power Sequencing | Industrial PLC Controller Supervision |
|---|---|
Use Scenario: Monitors 3.3V I/O rail, 5V core rail, and adjustable 1.8V memory rail during cold boot and thermal cycling. IC Role / Device Role / Timing Role: Triple-supply supervisor providing synchronized reset assertion and power-fail warning to CPU and FPGA. Use Value: Prevents metastability by ensuring all rails stabilize before releasing reset; PFO triggers firmware-controlled save-to-EEPROM prior to AC loss. | Use Scenario: Supervises 3.3V logic, 5V sensor interface, and adjustable 2.5V analog front-end in harsh factory environments. IC Role / Device Role / Timing Role: Fault-tolerant voltage monitor with latch mode for in-situ margin testing without system interruption. Use Value: ±1.5% threshold accuracy eliminates need for derating; TMR latch enables live validation of reset timing margins under load. |
| Automotive Infotainment Head Unit | Network Server Board Management |
Use Scenario: Tracks 3.3V MCU supply, 5V USB host rail, and adjustable 1.2V SoC core voltage across –40°C to 85°C ambient. IC Role / Device Role / Timing Role: Automotive-grade supervisor (with I-grade variant) delivering fail-safe reset coordination and brownout resilience. Use Value: 0.5V VCC operation ensures clean reset deassertion during battery sag; PFO signals microcontroller to suspend noncritical tasks. | Use Scenario: Manages 3.3V management controller, 5V PCIe switch rail, and adjustable 1.0V ASIC supply in multi-rail server backplane. IC Role / Device Role / Timing Role: High-accuracy triple monitor interfacing with BMC via PFO interrupt and RST reset tree. Use Value: Internal 200ms timeout eliminates external capacitor; ±1.5% accuracy avoids overspecifying PSU tolerances in BOM. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6315US33D3+T | Single 3.3V monitor only; no V2/ADJ/PFI functionality; SOT23-5 package | Cannot replace triple-monitoring function; suitable only for basic 3.3V reset-only use cases | Select only if system requires only 3.3V supervision and board space is extremely constrained |
| TPS3808G33DBVR | Dual supply monitor (3.3V + adjustable); no PFI input or TMR latch; 6-pin SOT23 | Lacks power-fail warning and margin-test latch; reset timeout fixed at 200ms or 400ms | Choose when PFI signaling and latch mode are unnecessary, and dual-rail monitoring suffices |
Compared with MAX6315US33D3+T and TPS3808G33DBVR, the LTC2911CDDB-1 uniquely delivers simultaneous 3.3V/5V/adjustable monitoring, programmable PFI-based early warning, and hardware-enforced reset latching - making it irreplaceable in systems requiring coordinated multi-rail power integrity verification.
Availability
LTC2911CDDB-1 is available at Aetrix Electronics and suitable for desktop computer power sequencing, industrial PLC controller supervision, and network server board management requiring stable component supply, long-term lifecycle support, and guaranteed commercial-temperature performance.
Supply support for LTC2911CDDB-1 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. (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 high-accuracy, low-power multi-rail system supervision in computing, industrial, and automotive applications where reliability under voltage transients and brownout conditions is critical.
FAQ
What is the exact reset threshold voltage for V1 and V2 on the LTC2911CDDB-1?
The LTC2911CDDB-1 has a guaranteed V1 reset threshold of 3.086V ±1.5% (3.036V to 3.135V) and a V2 threshold of 4.675V ±1.5% (4.600V to 4.750V), both specified over the full 0°C to 70°C operating range. These values correspond to –6.5% of nominal 3.3V and 5V supplies, tighter than standard –5% reset ICs, reducing system voltage margin requirements. The LTC2911CDDB-1 datasheet confirms these values in the Electrical Characteristics table under VRT33 and VRT50 parameters.
Does the LTC2911CDDB-1 support external capacitor-based reset timeout, and what is the scaling factor?
Yes, the LTC2911CDDB-1 supports external capacitor-based reset timeout via the TMR pin. Connecting CTMR from TMR to GND sets timeout per the formula tRST ≈ CTMR × 106.5 pF/ms - for example, 2.2nF yields ~23.4ms (within the 15–27ms spec). The device also offers an internal 200ms timeout when TMR is tied to V1. Leakage current on CTMR must stay below 500nA to maintain accuracy. This flexibility is documented in the LTC2911CDDB-1 datasheet's Electrical Characteristics and Applications Information sections.
How does the PFI input function on the LTC2911CDDB-1, and what is its hysteresis?
The PFI input on the LTC2911CDDB-1 monitors an external voltage via resistive divider and compares it to a 500mV falling-edge threshold and 515mV rising-edge threshold, delivering 15mV (3%) hysteresis for noise immunity. When PFI falls below 500mV, PFO asserts low within 8–80µs propagation delay; it releases high when PFI rises above 515mV. This enables early warning of power failure before V1/V2/ADJ trip. The LTC2911CDDB-1 datasheet specifies VPFT = 500mV and ∆VPFT = 10–19mV in the Electrical Characteristics table.
Can the LTC2911CDDB-1 operate with supply voltages below 1V, and what is the minimum guaranteed VCC?
Yes, the LTC2911CDDB-1 guarantees functional operation down to VCC = 0.5V, meaning RST and PFO outputs remain valid logic states even during severe brownout. This is enabled by proprietary low-voltage drive circuitry that maintains output pull-down strength at ultralow VCC. The specification appears in the Absolute Maximum Ratings and Applications Information sections of the LTC2911CDDB-1 datasheet, and is confirmed by the "Ultralow Voltage Reset: VCC = 0.5V Guaranteed" feature bullet.
What is the purpose of the TMR pin on the LTC2911CDDB-1, and how is it used for latch mode?
The TMR pin on the LTC2911CDDB-1 serves dual functions: configuring reset timeout (via capacitor or internal 200ms) and enabling reset latch mode. Pulling TMR to GND latches the current RST state - if RST is low, it stays low regardless of input conditions; if high, it remains high until released. Releasing TMR (e.g., to V1) restores normal monitoring after setup/hold timing. This is explicitly detailed in the Pin Functions and Applications Information sections of the LTC2911CDDB-1 datasheet.
LTC2911CDDB-1 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:
- 3.086V, 4.675V, 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-1 FAQ
1.How can I place an order for LTC2911CDDB-1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2911CDDB-1 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-1 reliable?
The price and inventory of LTC2911CDDB-1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2911CDDB-1 is usually 5 days.
3.What payment methods are accepted for LTC2911CDDB-1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2911CDDB-1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2911CDDB-1?
LTC2911CDDB-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2911CDDB-1 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-1?
For technical support, including LTC2911CDDB-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2911CDDB-1 requirements.
6.How does Aetrix verify that LTC2911CDDB-1 is sourced from the original manufacturer or authorized distributors?
All LTC2911CDDB-1 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-1 meets industry standards.
7.What is the process for return or replacement of LTC2911CDDB-1?
All LTC2911CDDB-1 units undergo pre-shipment inspection (PSI). If there is an issue with LTC2911CDDB-1, 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-1 part is unused and in its original packaging.
Return procedure for LTC2911CDDB-1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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