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Analog Devices Inc. LTC2911HDDB-2
- Part No.:
- LTC2911HDDB-2
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC2911HDDB-2.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,167
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Product details
Overview
LTC2911HDDB-2 from Analog Devices (formerly Linear Technology) is a precision triple supply monitor IC with integrated power-fail comparator and latched reset control, designed for automotive-grade systems. It monitors 3.3V (V1), 2.5V (V2), and an adjustable input (ADJ) with ±1.5% threshold accuracy over –40°C to +125°C, supports internal 200ms reset timeout, and operates down to 0.5V VCC. It is used in engine control units and ADAS domain controllers requiring high-reliability voltage supervision.
For engineers reviewing the LTC2911HDDB-2 datasheet, LTC2911HDDB-2 pinout, LTC2911HDDB-2 application, or LTC2911HDDB-2 equivalent, key selection criteria include its H-grade temperature range, DFN-8 package, triple-supply monitoring capability with independent PFI power-fail warning, latch-enabled margin testing, and guaranteed operation at ultralow 0.5V supply voltage.
Technical Context
The LTC2911HDDB-2 implements three independent comparators: V1 fixed at 3.086V (–6.5% of 3.3V), V2 fixed at 2.338V (–6.5% of 2.5V), and ADJ with 500mV nominal threshold. Its internal VCC is derived from the higher of V1 or V2, enabling robust operation during asymmetric supply ramp-up.
A dedicated PFI comparator with 500mV falling / 515mV rising threshold provides hysteresis-based early power-fail detection, while the TMR pin supports three modes: external capacitor timeout, internal 200ms timeout (TMR = V1), or latch mode (TMR = GND) for margin testing - all validated across the full –40°C to +125°C automotive temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| V1 Threshold | 3.086V ±1.5% - guarantees reliable 3.3V supply undervoltage detection across full temperature range |
| V2 Threshold | 2.338V ±1.5% - precisely monitors 2.5V rail with no external resistor network required |
| ADJ Threshold | 500mV ±1.5% - enables configurable third supply monitoring via resistive divider |
| PFI Threshold | 500mV falling / 515mV rising - provides 3% hysteresis for noise-immune power-fail warning |
| Reset Timeout | 200ms internal (TMR = V1) or 15–27ms external (CTMR = 2.2nF) - eliminates need for external RC timing components |
| Supply Current | 30µA typical - enables low-power always-on supervision in battery-backed systems |
| Min Operating VCC | 0.5V - ensures RST/PFO remain valid during deep brown-out conditions |
Pinout & Package
Package: 8-lead (3mm × 2mm) plastic DFN with exposed pad (Pin 9 = GND). RoHS-compliant, lead-free finish, rated for TJMAX = 150°C and θJA = 76°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PFI | Power-fail input | Accepts resistive-divider-scaled voltage; asserts PFO low when falling below 500mV |
| ADJ | Adjustable monitor input | High-impedance 500mV comparator input for third supply; tied to V1 if unused |
| TMR | Reset timeout/latch control | Configures timeout mode (V1 = 200ms, GND = latch, capacitor = programmable) |
| GND | Device ground reference | Primary return path; exposed pad must be connected to PCB ground plane |
| V2 | 2.5V supply monitor input | Fixed-threshold comparator input for 2.5V rail; bypassed with ≥0.1µF capacitor |
| V1 | 3.3V supply monitor input & VCC source | Primary 3.3V monitor and main power source; requires ≥0.1µF bypass capacitor |
| PFO | Power-fail logic output | Open-drain output pulled up to V1; signals early power failure before RST assertion |
| RST | Reset logic output | Open-drain reset output pulled up to V1; asserts low if any monitored supply falls below threshold |
Key Features
| Feature | Design Value |
|---|---|
| Triple simultaneous monitoring | Monitors 3.3V, 2.5V, and adjustable supply independently - eliminates need for multiple discrete supervisors |
| ±1.5% threshold accuracy | Guaranteed over –40°C to +125°C - reduces system voltage margin requirements and prevents false resets |
| Ultralow 0.5V VCC operation | Ensures RST/PFO remain functional during severe brown-out - critical for fail-safe automotive shutdown sequencing |
| Configurable reset timeout | Internal 200ms or external capacitor-programmable - simplifies BOM and improves timing repeatability |
| Power-fail comparator with hysteresis | 500mV/515mV thresholds with 3% hysteresis - rejects noise while providing precise early-warning signaling |
| Reset latch for margin testing | TMR pin pull-down holds RST state - enables controlled voltage margining without unintended system reset |
Applications
| Engine Control Unit (ECU) Supervision | ADAS Domain Controller Power Monitoring |
|---|---|
Use Scenario: Real-time monitoring of 3.3V microcontroller core, 2.5V sensor interface, and 5V CAN transceiver supply in gasoline/diesel ECU. IC Role / Device Role / Timing Role: LTC2911HDDB-2 acts as primary voltage supervisor, asserting RST only after all rails stabilize for 200ms and issuing PFO warning if main battery drops below 11.5V. Use Value: Prevents ECU lockup during cold cranking by guaranteeing reset release only after stable 3.3V/2.5V/5V; PFO triggers CAN bus shutdown before brown-out corrupts firmware. | Use Scenario: Supervising 3.3V SoC core, 2.5V image signal processor, and adjustable 1.8V memory rail in radar/vision fusion controller. IC Role / Device Role / Timing Role: LTC2911HDDB-2 monitors all three rails simultaneously and uses ADJ input to track DDR voltage via resistive divider; PFI watches 12V input for battery degradation. Use Value: Enables deterministic power sequencing: PFO interrupt initiates graceful sensor deactivation and data flush to flash before RST forces full reset during voltage collapse. |
| Automotive Infotainment Head Unit | Electric Vehicle Battery Management Interface |
Use Scenario: Ensuring clean startup of 3.3V application processor, 2.5V audio codec, and 1.2V GPU in head unit with dual-battery backup. IC Role / Device Role / Timing Role: LTC2911HDDB-2 uses internal 200ms timeout and TMR latch to validate rail stability during ignition-on transition; ADJ monitors 1.2V GPU via 2-resistor divider. Use Value: Eliminates display artifacts and boot failures by preventing processor release until all supplies meet ±1.5% threshold tolerance - verified across –40°C to +125°C. | Use Scenario: Monitoring 3.3V MCU, 2.5V isolated communication, and adjustable cell-stack voltage in BMS master controller. IC Role / Device Role / Timing Role: LTC2911HDDB-2 configures ADJ to monitor scaled battery stack (e.g., 400V → 0.5V); PFI tracks 12V auxiliary supply for pre-charge circuit readiness. Use Value: Provides dual-layer fault detection: PFO warns of 12V auxiliary failure before main contactor closure; RST blocks MCU boot if cell-stack scaling fails or MCU rail is unstable. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G33DBVR | Single 3.3V monitor only; no V2/ADJ inputs; no PFI comparator; 200ms fixed timeout only | Suitable for basic 3.3V-only systems; cannot replace triple-monitoring function of LTC2911HDDB-2 | Select only if design requires only 3.3V supervision and cost sensitivity outweighs feature loss |
| MAX6816EUT+T | Single-channel, 5V-tolerant supervisor; no adjustable input; no PFI; 140ms timeout; ±2.5% threshold accuracy | Limited to single-rail monitoring; lower accuracy and no automotive temp grade (only –40°C to +85°C) | Consider only for non-automotive industrial applications where triple monitoring is unnecessary |
Compared with TPS3808G33DBVR and MAX6816EUT+T, the LTC2911HDDB-2 uniquely delivers simultaneous 3.3V/2.5V/adjustable monitoring, automotive-grade temperature support, integrated PFI warning, and latch-enabled margin testing - making it irreplaceable in safety-critical multi-rail automotive systems.
Availability
LTC2911HDDB-2 is available at Aetrix Electronics and suitable for automotive ECUs, ADAS domain controllers, and battery management interfaces requiring stable component supply under AEC-Q100 stress conditions and long-term lifecycle continuity.
Supply support for LTC2911HDDB-2 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 automotive, industrial, communications, and healthcare markets.
The LTC2911 family was designed by Linear Technology (acquired by ADI in 2017) specifically for high-accuracy, low-power voltage supervision in mission-critical automotive and industrial systems demanding ±1.5% threshold stability across extreme temperatures.
FAQ
What is the operating temperature range of the LTC2911HDDB-2?
The LTC2911HDDB-2 is rated for –40°C to +125°C (H-grade), meeting automotive under-hood requirements. This range is validated per the device's absolute maximum ratings and electrical characteristics tables, with all key parameters - including ±1.5% threshold accuracy and 200ms internal timeout - guaranteed across the full span. The DFN package's θJA of 76°C/W supports thermal reliability in compact enclosures.
How does the LTC2911HDDB-2 differ from the LTC2911HDDB-1?
The LTC2911HDDB-2 monitors 3.3V (V1) and 2.5V (V2) supplies, whereas the LTC2911HDDB-1 monitors 3.3V (V1) and 5V (V2). Both share identical ADJ, PFI, TMR, RST, and PFO functionality, same DFN-8 package, H-grade temperature range, and ±1.5% threshold accuracy. The V2 threshold is factory-trimmed: 2.338V for -2 vs. 4.675V for -1 - no external configuration is needed.
Can the LTC2911HDDB-2 monitor a 1.8V supply instead of 2.5V?
No - the LTC2911HDDB-2 is specifically configured for 2.5V on V2. To monitor 1.8V, use LTC2911HDDB-3 (V2 = 1.683V). The V2 threshold is laser-trimmed at wafer test and not user-adjustable; substituting a different voltage risks undervoltage detection failure. The ADJ pin remains available for a third supply (e.g., 1.8V) using a resistive divider.
What is the purpose of the exposed pad on the LTC2911HDDB-2 DFN package?
Pin 9 (exposed pad) is electrically connected to GND and must be soldered to a PCB ground plane. It serves two critical functions: (1) lowers thermal resistance (θJA = 76°C/W vs. 195°C/W for TSOT-23), enabling reliable operation at +125°C ambient; (2) provides low-inductance grounding for noise-sensitive comparators. Leaving it unconnected violates the Absolute Maximum Ratings and risks thermal runaway or erratic reset behavior.
Does the LTC2911HDDB-2 require external pull-up resistors on RST and PFO?
The LTC2911HDDB-2 provides weak internal pull-ups to V1 (typically 29µA at V1 = 3.3V), sufficient for most logic interfaces. However, external pull-ups are recommended when driving capacitive loads >20pF, interfacing with >3.3V logic families, or requiring faster rise times. For 5V-tolerant I/O, a 10kΩ external pull-up to 5V is commonly used - the internal pull-up remains active but does not conflict.
LTC2911HDDB-2 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:
- 2.338V, 3.086V, 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-2 FAQ
1.How can I place an order for LTC2911HDDB-2 through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2911HDDB-2 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-2 reliable?
The price and inventory of LTC2911HDDB-2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2911HDDB-2 is usually 5 days.
3.What payment methods are accepted for LTC2911HDDB-2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2911HDDB-2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2911HDDB-2?
LTC2911HDDB-2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2911HDDB-2 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-2?
For technical support, including LTC2911HDDB-2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2911HDDB-2 requirements.
6.How does Aetrix verify that LTC2911HDDB-2 is sourced from the original manufacturer or authorized distributors?
All LTC2911HDDB-2 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-2 meets industry standards.
7.What is the process for return or replacement of LTC2911HDDB-2?
All LTC2911HDDB-2 units undergo pre-shipment inspection (PSI). If there is an issue with LTC2911HDDB-2, 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-2 part is unused and in its original packaging.
Return procedure for LTC2911HDDB-2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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