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Analog Devices Inc. LTC2911HDDB-5
- Part No.:
- LTC2911HDDB-5
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC2911HDDB-5.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,140
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Product details
Overview
LTC2911HDDB-5 from Analog Devices (formerly Linear Technology) is a precision triple supply monitor IC with power-fail comparator and reset latching capability. It monitors V1 (3.3V), V2 (adjustable, 0.5V threshold), and ADJ (adjustable, 0.5V threshold), features ±1.5% threshold accuracy over –40°C to +125°C, 30µA typical quiescent current, and internal 200ms reset timeout - used in automotive engine control units for reliable multi-rail power sequencing and brownout detection.
For engineers reviewing the LTC2911HDDB-5 datasheet, LTC2911HDDB-5 pinout, LTC2911HDDB-5 application, or LTC2911HDDB-5 equivalent, key selection factors include its H-grade automotive temperature range (–40°C to +125°C), DFN-8 (3mm × 2mm) package, dual adjustable monitoring inputs (V2 and ADJ), PFI-based early power-fail warning, and TMR-controlled latch mode for margin testing.
Technical Context
The LTC2911HDDB-5 implements three independent voltage comparators: one fixed 3.086V threshold on V1 (3.3V rail), and two high-impedance 0.5V-threshold inputs on V2 and ADJ-enabling flexible resistive-divider configuration for custom supply thresholds. Its internal VCC is derived solely from V1, unlike other variants that select between V1/V2.
It integrates a dedicated power-fail comparator (PFI → PFO) with 500mV falling / 515mV rising thresholds and 15mV typical hysteresis, plus a programmable reset timeout via TMR pin (internal 200ms or external capacitor). The latch feature allows RST state hold during voltage margining without requiring continuous input validity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| V1 Threshold | 3.086V ±1.5% - guarantees reliable 3.3V rail undervoltage detection across full automotive temperature range |
| V2/ADJ Threshold | 500mV ±7.5mV - enables precise custom trip points via resistive dividers for any supply rail |
| Quiescent Current | 30µA typical - minimizes loading on monitored 3.3V supply (V1), critical for low-power automotive modules |
| PFI Hysteresis | 15mV typical - provides noise immunity for early-warning power-fail signaling without oscillation |
| Reset Timeout | 200ms internal - eliminates need for external timing capacitor in most automotive reset timing requirements |
| Operating Temp | –40°C to +125°C - qualified for under-hood automotive applications per AEC-Q100 stress test conditions |
| Supply Range | V1 = 0.5V to 6.5V - ensures RST/PFO remain functional down to ultralow VCC, preventing indeterminate logic states during power-up |
Pinout & Package
Package: 8-lead (3mm × 2mm) plastic DFN with exposed pad (pin 9, GND). Compact footprint supports high-density automotive PCB layouts while enabling efficient thermal dissipation (θJA = 76°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (PFI) | Power-fail input | Accepts resistive-divider output; triggers PFO low when voltage falls below 500mV - used for early warning of main battery or DC/DC input collapse |
| 2 (ADJ) | Adjustable monitor input | High-Z 0.5V comparator input; configured with external divider to monitor third supply (e.g., 1.2V core rail) |
| 3 (TMR) | Reset timeout/latch control | Connect to V1 for 200ms internal timeout; pull to GND to latch RST state - essential for production margin testing |
| 4 (GND) | Device ground | Reference for all comparators and outputs; exposed pad must be connected to PCB ground plane for thermal and noise performance |
| 5 (RST) | Reset logic output | Open-drain, weak-pull-up-to-V1; asserts low if any monitored input drops below threshold - drives microcontroller reset pin directly |
| 6 (PFO) | Power-fail logic output | Open-drain, weak-pull-up-to-V1; asserts low on PFI threshold breach - connects to MCU NMI or PMIC fault input |
| 7 (V1) | 3.3V monitor & power source | Fixed 3.086V threshold input; supplies internal VCC - must be bypassed with ≥0.1µF capacitor for stability |
| 8 (V2) | Adjustable monitor input | High-Z 0.5V comparator input (identical to ADJ); enables dual adjustable rail monitoring - e.g., V2 for 5V IO, ADJ for 1.8V PHY |
Key Features
| Feature | Design Value |
|---|---|
| Triple simultaneous monitoring | Monitors 3.3V (V1), plus two independently configurable rails (V2 and ADJ) - eliminates need for multiple discrete supervisors in multi-supply systems |
| ±1.5% threshold accuracy | Guaranteed over –40°C to +125°C - reduces system voltage margin requirements and prevents false resets in thermally stressed environments |
| Ultralow VCC operation | RST/PFO functional down to 0.5V VCC - ensures deterministic reset behavior during slow power ramp-up or brownout recovery |
| Configurable power-fail warning | PFI input with 500mV/515mV hysteresis - enables precise early-warning threshold setting for battery or input supply without external comparators |
| Reset latch for margin testing | TMR pin pulls RST into persistent state - allows controlled voltage reduction below trip point without triggering system reset during validation |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC I/O Module |
|---|---|
Use Scenario: Monitors 3.3V microcontroller core, 5V sensor interface, and 12V battery input via resistive dividers in an under-hood ECU. IC Role / Device Role / Timing Role: LTC2911HDDB-5 acts as primary power supervisor - asserting RST on any rail undervoltage and PFO on battery sag prior to full collapse. Use Value: Enables fail-safe shutdown sequencing and nonvolatile memory save before loss of 3.3V logic, meeting ISO 26262 ASIL-B diagnostic coverage requirements. | Use Scenario: Supervises isolated 3.3V digital logic, 24V field power, and 5V analog front-end in a DIN-rail mounted PLC module. IC Role / Device Role / Timing Role: LTC2911HDDB-5 provides synchronized reset assertion and early PFO warning on 24V supply dip, coordinating safety relay de-energization. Use Value: Prevents spurious I/O state changes during transient brownouts by holding RST asserted until all rails stabilize for >200ms. |
| Medical Infusion Pump Controller | Avionics Power Management Unit |
Use Scenario: Monitors 3.3V MCU, 5V motor driver, and backup Li-ion cell voltage in a battery-powered infusion pump. IC Role / Device Role / Timing Role: LTC2911HDDB-5 uses PFI to detect battery depletion (via divider) and triggers PFO to initiate graceful shutdown before RST asserts on 3.3V collapse. Use Value: Ensures delivery of final dose and EEPROM logging completion using 200ms internal timeout - no external capacitor required for timing reliability. | Use Scenario: Supervises 28V aircraft bus, 5V avionics logic, and 3.3V FPGA configuration rail in a DO-254-compliant power management unit. IC Role / Device Role / Timing Role: LTC2911HDDB-5 provides triple-rail monitoring with latch mode enabled during flight-critical voltage margin tests. Use Value: Allows verification of reset assertion at 90% nominal voltage without disrupting system operation - TMR pin simplifies test automation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6369AUT+T | Single 3.3V monitor only; no V2/ADJ dual-adjustable inputs; 200ms fixed timeout; SO-8 package | Lacks triple-monitor capability and PFI power-fail warning - suitable only for basic 3.3V-only systems | Select only if design requires minimal BOM count and monitors only one rail; not a functional replacement for LTC2911HDDB-5's triple supervision. |
| TPS3808G33DBVR | Single 3.3V supervisor; 200ms timeout; SOT-23-6; no PFI input or latch mode | No power-fail warning or adjustable second/third inputs - cannot replicate early-warning or margin-test functionality | Use only for cost-sensitive, single-rail applications where PFO and TMR features are unnecessary. |
Compared with MAX6369AUT+T and TPS3808G33DBVR, the LTC2911HDDB-5 uniquely delivers triple-rail monitoring, dual adjustable inputs (V2/ADJ), integrated PFI-based early power-fail signaling, and TMR-controlled latch mode - making it irreplaceable in automotive, industrial, and safety-critical systems requiring coordinated multi-supply supervision.
Availability
LTC2911HDDB-5 is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLCs, medical infusion pumps, and avionics power management systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC2911HDDB-5 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 semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC2911 family was designed by Linear Technology (acquired by ADI in 2017) specifically for precision multi-rail power monitoring in harsh environments - emphasizing threshold accuracy, ultralow-voltage operation, and configurability for automotive and industrial applications.
FAQ
What is the operating temperature range of the LTC2911HDDB-5?
The LTC2911HDDB-5 is rated for –40°C to +125°C, qualifying it for under-hood automotive applications and industrial environments with extreme thermal cycling. This H-grade specification exceeds commercial (0°C to 70°C) and industrial (–40°C to 85°C) variants, and is validated per AEC-Q100 stress test conditions.
How does the LTC2911HDDB-5 differ from other LTC2911 variants like LTC2911-1 or LTC2911-2?
The LTC2911HDDB-5 uses the "-5" variant designation, meaning V2 is an adjustable 0.5V-threshold input (like ADJ), unlike LTC2911-1 (5V fixed) or LTC2911-2 (2.5V fixed). Combined with its H-grade temperature range and DFN-8 package, the LTC2911HDDB-5 supports dual adjustable rail monitoring in automotive systems where flexibility and ruggedness are required.
Can the LTC2911HDDB-5 monitor more than three voltage rails?
No - the LTC2911HDDB-5 monitors exactly three rails: V1 (fixed 3.3V), V2 (adjustable), and ADJ (adjustable). However, because both V2 and ADJ accept resistive dividers, it can supervise up to three *independent* supply voltages (e.g., 3.3V, 12V, and 5V) simultaneously. Additional rails require cascading or separate supervisors.
What is the purpose of the TMR pin on the LTC2911HDDB-5?
The TMR pin on the LTC2911HDDB-5 serves two functions: (1) connecting to V1 enables the internal 200ms reset timeout, eliminating external components; (2) pulling TMR to GND latches the current RST state - a critical feature for voltage margin testing without unintended system resets during validation.
Does the LTC2911HDDB-5 require external pull-up resistors on RST and PFO?
The LTC2911HDDB-5 provides weak internal pull-ups to V1 on both RST and PFO (typically 29µA at V1 = 3.3V), sufficient for driving CMOS inputs. External pull-ups are optional - used only when faster rise times or VOH > V1 are required. For standard microcontroller reset inputs, the internal pull-up is adequate and reduces BOM count.
LTC2911HDDB-5 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, Adj, Adj
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- Adjustable/Selectable
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x2)
LTC2911HDDB-5 FAQ
1.How can I place an order for LTC2911HDDB-5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2911HDDB-5 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 LTC2911HDDB-5 reliable?
The price and inventory of LTC2911HDDB-5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2911HDDB-5 is usually 5 days.
3.What payment methods are accepted for LTC2911HDDB-5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2911HDDB-5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2911HDDB-5?
LTC2911HDDB-5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2911HDDB-5 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 LTC2911HDDB-5?
For technical support, including LTC2911HDDB-5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2911HDDB-5 requirements.
6.How does Aetrix verify that LTC2911HDDB-5 is sourced from the original manufacturer or authorized distributors?
All LTC2911HDDB-5 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 LTC2911HDDB-5 meets industry standards.
7.What is the process for return or replacement of LTC2911HDDB-5?
All LTC2911HDDB-5 units undergo pre-shipment inspection (PSI). If there is an issue with LTC2911HDDB-5, 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 LTC2911HDDB-5 part is unused and in its original packaging.
Return procedure for LTC2911HDDB-5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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