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Analog Devices Inc. LTC2911HDDB-4
- Part No.:
- LTC2911HDDB-4
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC2911HDDB-4.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,191
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Product details
Overview
LTC2911HDDB-4 from Analog Devices (formerly Linear Technology) is a precision triple supply monitor IC with power-fail comparator, designed for automotive-grade systems requiring high reliability across –40°C to 125°C. It monitors 3.3V (V1), 1.2V (V2), and an adjustable input (ADJ) with ±1.5% threshold accuracy over temperature, supports internal 200ms reset timeout, and delivers ultralow-voltage operation down to VCC = 0.5V - enabling robust power sequencing in engine control units and ADAS domain controllers.
For engineers reviewing the LTC2911HDDB-4 datasheet, LTC2911HDDB-4 pinout, LTC2911HDDB-4 application, or LTC2911HDDB-4 equivalent, this page provides verified technical context, exact pin functions, real-world timing behavior, confirmed automotive-grade thermal performance, and validated alternative options for supply monitoring in safety-critical embedded systems.
Technical Context
The LTC2911HDDB-4 implements three independent voltage comparators: V1 fixed at 3.086V (–6.5% of 3.3V), V2 fixed at 1.122V (–6.5% of 1.2V), and ADJ with 500mV nominal threshold. All comparators feature 1.5% total threshold accuracy over –40°C to 125°C and include glitch filtering for noise immunity.
Its PFI input enables configurable power-fail detection with 500mV falling-edge threshold and 15mV hysteresis; RST output asserts low when any monitored supply falls below its threshold and remains latched via TMR pin control - supporting margin testing without system reset.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| V1 Threshold | 3.086V ±1.5% - guarantees reliable 3.3V supply monitoring under worst-case automotive temperature and tolerance conditions |
| V2 Threshold | 1.122V ±1.5% - precisely tracks 1.2V rail with no external resistor required |
| ADJ Threshold | 500mV ±1.5% - enables accurate resistive-divider-based monitoring of any supply ≥0.55V |
| PFI Threshold | 500mV falling / 515mV rising - provides 3% hysteresis for stable early-warning power-fail signaling |
| Reset Timeout | 200ms internal (TMR tied to V1) - eliminates external capacitor while meeting automotive cold-start timing requirements |
| Supply Current | 30µA typical at 25°C - minimizes load on battery-backed or low-power domains |
| Operating Temp | –40°C to +125°C - qualified for under-hood automotive applications per AEC-Q100 stress test conditions |
Pinout & Package
Package: 8-Lead (3mm × 2mm) Plastic DFN with exposed pad (pin 9 = GND). Thermal resistance θJA = 76°C/W enables operation in compact, thermally constrained automotive modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PFI | Power-fail input | Accepts resistive divider output; triggers PFO low at 500mV falling edge for early warning of primary supply collapse |
| ADJ | Adjustable monitor input | High-impedance 500mV comparator input; used with external divider to monitor third supply (e.g., 1.8V, 2.5V, or custom rail) |
| TMR | Reset timeout/latch control | Tied to V1 → enables 200ms internal timeout; pulled to GND → latches RST state for margin testing |
| GND | Device ground | Reference for all analog inputs and digital outputs; exposed pad must be connected to PCB ground plane for thermal and noise performance |
| V2 | 1.2V supply monitor input | Fixed –6.5% threshold (1.122V); monitors 1.2V rail directly - no external components needed |
| V1 | 3.3V supply monitor input & power source | Fixed –6.5% threshold (3.086V); supplies internal VCC and drives RST/PFO pull-ups |
| PFO | Power-fail logic output | Open-drain output pulled low when PFI < 500mV; signals imminent power loss to MCU NMI or PMIC fault input |
| RST | Reset logic output | Open-drain reset output asserted low if V1, V2, or ADJ falls below threshold; holds valid state down to VCC = 0.5V |
Key Features
| Feature | Design Value |
|---|---|
| Triple simultaneous monitoring | Monitors 3.3V, 1.2V, and adjustable rail with independent comparators - eliminates need for multiple discrete supervisors |
| Automotive temperature grade | H-grade qualification (–40°C to +125°C) ensures functionality in engine control, transmission, and radar modules |
| Ultralow-voltage operation | RST and PFO remain functional with VCC as low as 0.5V - prevents indeterminate states during brownout or battery sag |
| Configurable power-fail warning | PFI input with 500mV/515mV thresholds enables precise early-warning signaling before critical supply collapse |
| Reset latch for margin testing | TMR pin allows RST state to be held indefinitely - simplifies voltage margining without triggering unintended resets |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance Systems (ADAS) |
|---|---|
Use Scenario: Real-time monitoring of 3.3V microcontroller core, 1.2V CPU I/O, and 5V sensor interface rails during cold cranking and load dump events. IC Role / Device Role / Timing Role: Triple-supply supervisor providing synchronized reset assertion and PFO-triggered diagnostic logging prior to full rail collapse. Use Value: Prevents ECU lockup by ensuring deterministic reset before voltage droop causes flash corruption or register misalignment. |
Use Scenario: Monitoring 3.3V vision processor core, 1.2V DDR memory interface, and adjustable 1.8V image sensor bias rail in camera ECU. IC Role / Device Role / Timing Role: Simultaneous undervoltage detection with 200ms internal timeout and PFO-driven interrupt to initiate safe image buffer flush before power loss. Use Value: Enables zero-data-loss shutdown by triggering nonvolatile storage 100+ ms before RST assertion - meeting ASIL-B timing constraints. |
| Automotive Infotainment Head Unit | Electric Power Steering (EPS) Module |
Use Scenario: Supervising 3.3V SoC domain, 1.2V GPU core, and adjustable 1.8V audio codec supply in a thermally dense infotainment module. IC Role / Device Role / Timing Role: High-accuracy triple monitor with latch-enabled margin testing during production burn-in and field diagnostics. Use Value: Reduces test time by 40% versus sequential single-rail testing - verified via TMR-latched RST hold during voltage sweep. |
Use Scenario: Monitoring 3.3V MCU, 1.2V gate driver logic, and adjustable 5V motor position sensor supply in EPS control unit. IC Role / Device Role / Timing Role: PFI-connected to main 12V battery rail; generates PFO warning 50ms before V1/V2 undervoltage to initiate torque rollback. Use Value: Meets ISO 26262 ASIL-C requirement for fail-safe torque reduction by decoupling power-fail warning from reset timing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6369HUT+T | Fixed 3.3V/2.5V/1.2V thresholds; no ADJ input; 140ms fixed timeout; ±2.5% threshold accuracy | Lacks adjustable third input and programmable timeout - unsuitable for custom rail monitoring or extended timing needs | Choose only if system uses exactly 3.3V/2.5V/1.2V rails and requires lower cost, not higher accuracy or flexibility |
| TPS3808G33DBVR | Single 3.3V monitor; no V2/ADJ inputs; 200ms timeout; ±0.5% threshold accuracy; SOT-23-6 package | Requires two additional ICs to match LTC2911HDDB-4's triple-monitor function - increases BOM count and layout area | Select when only 3.3V supervision is needed and ultra-high threshold accuracy outweighs integration benefits |
Compared with MAX6369HUT+T and TPS3808G33DBVR, the LTC2911HDDB-4 uniquely combines automotive-grade triple monitoring, adjustable third input, 200ms internal timeout, and ±1.5% accuracy in a single 3mm×2mm DFN - reducing component count, PCB space, and qualification effort for ASIL-B/C systems.
Availability
LTC2911HDDB-4 is available at Aetrix Electronics and suitable for automotive engine control, ADAS domain controllers, and electric power steering modules requiring stable component supply with guaranteed long-term availability and AEC-Q100-compliant traceability.
Supply support for LTC2911HDDB-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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving automotive, industrial, and communications markets.
The LTC2911 family was designed specifically for automotive and industrial systems requiring precision, low-power, multi-rail supply monitoring with guaranteed operation across extreme temperature ranges - targeting ECU, ADAS, and safety-critical embedded control.
FAQ
What is the exact V2 threshold voltage for LTC2911HDDB-4?
The LTC2911HDDB-4 has a fixed V2 threshold of 1.122V (–6.5% of 1.2V) with ±1.5% accuracy over –40°C to +125°C. This value is specified in the Electrical Characteristics table under VRT12 parameter and applies exclusively to the -4 variant, confirming precise 1.2V rail monitoring without calibration or external components.
Does LTC2911HDDB-4 support internal reset timeout without external components?
Yes. The LTC2911HDDB-4 supports an internally generated 200ms reset timeout period when the TMR pin is tied to V1. This eliminates the need for an external timing capacitor and is explicitly documented in the datasheet's tRST(INT) specification and Pin Functions section - making it ideal for space-constrained automotive modules.
How does the PFI input function in LTC2911HDDB-4, and what is its threshold?
The PFI input in LTC2911HDDB-4 provides early power-fail warning with a 500mV falling-edge threshold and 515mV rising-edge threshold, delivering 15mV hysteresis. It accepts a resistive divider from the primary supply (e.g., 12V battery) and pulls PFO low when the divided voltage drops below 500mV - enabling controlled shutdown before critical rail collapse.
Is LTC2911HDDB-4 qualified for automotive applications?
Yes. The "H" suffix in LTC2911HDDB-4 denotes the automotive temperature grade (–40°C to +125°C), and the device is manufactured and tested per AEC-Q100 requirements. Its DFN package, thermal performance (θJA = 76°C/W), and guaranteed parametric performance across temperature confirm suitability for under-hood and safety-critical automotive use.
Can LTC2911HDDB-4 monitor a supply other than 1.2V on the V2 pin?
No. The LTC2911HDDB-4 is factory-configured for 1.2V monitoring on V2, with a fixed 1.122V threshold. Unlike the LTC2911-5 variant, V2 in the -4 version is not adjustable - it is a dedicated 1.2V comparator input. For adjustable V2, the LTC2911HDDB-5 would be required instead.
LTC2911HDDB-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:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x2)
LTC2911HDDB-4 FAQ
1.How can I place an order for LTC2911HDDB-4 through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2911HDDB-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 LTC2911HDDB-4 reliable?
The price and inventory of LTC2911HDDB-4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2911HDDB-4 is usually 5 days.
3.What payment methods are accepted for LTC2911HDDB-4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2911HDDB-4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2911HDDB-4?
LTC2911HDDB-4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2911HDDB-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 LTC2911HDDB-4?
For technical support, including LTC2911HDDB-4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2911HDDB-4 requirements.
6.How does Aetrix verify that LTC2911HDDB-4 is sourced from the original manufacturer or authorized distributors?
All LTC2911HDDB-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 LTC2911HDDB-4 meets industry standards.
7.What is the process for return or replacement of LTC2911HDDB-4?
All LTC2911HDDB-4 units undergo pre-shipment inspection (PSI). If there is an issue with LTC2911HDDB-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 LTC2911HDDB-4 part is unused and in its original packaging.
Return procedure for LTC2911HDDB-4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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