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Analog Devices Inc. LTC2911HDDB-1#TRPBF
- Part No.:
- LTC2911HDDB-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC2911HDDB-1#TRPBF.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,740
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Product details
Overview
LTC2911HDDB-1#TRPBF from Analog Devices (formerly Linear Technology) is a precision triple supply monitor IC with power-fail comparator, designed for automotive-grade systems operating from –40°C to 125°C. It monitors V1 = 3.3V (±1.5% threshold accuracy), V2 = 5V (±1.5%), and an adjustable ADJ input (500 mV nominal threshold), with internal 200 ms reset timeout and ultralow 30 µA quiescent current. It delivers reliable reset assertion during power-up/down in network servers and automotive control units.
For engineers reviewing the LTC2911HDDB-1#TRPBF datasheet, LTC2911HDDB-1#TRPBF pinout, LTC2911HDDB-1#TRPBF application, or LTC2911HDDB-1#TRPBF equivalent, key selection criteria include its H-grade temperature range, DFN-8 (3 mm × 2 mm) package, ±1.5% threshold accuracy over full temperature range, glitch-immune comparators, and latched RST capability for margin testing.
Technical Context
The LTC2911HDDB-1#TRPBF integrates three independent voltage comparators - one fixed at 3.3V (V1), one fixed at 5V (V2), and one adjustable via external resistive divider on ADJ - all sharing ±1.5% threshold accuracy across –40°C to 125°C. Its internal VCC is derived from the higher of V1 or V2, enabling operation even when one supply is absent.
A dedicated PFI comparator with 500 mV falling-edge threshold and 15 mV hysteresis drives the open-drain PFO output for early power-fail warning, while the TMR pin supports three modes: external capacitor timeout, internal 200 ms timeout (TMR tied to V1), or latch mode (TMR pulled low) to hold RST state during system margining.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| V1 Threshold | 3.086 V (3.3V – 6.5%), ±1.5% accuracy ensures reliable 3.3V rail monitoring without false resets |
| V2 Threshold | 4.675 V (5V – 6.5%), ±1.5% accuracy enables precise 5V supply supervision in mixed-rail systems |
| ADJ Threshold | 500 mV nominal, ±7.5 mV tolerance allows configurable third-supply monitoring via resistive divider |
| PFI Threshold | 500 mV falling edge, 515 mV rising edge (3% hysteresis) provides noise-immune early power-fail detection |
| Reset Timeout | 200 ms internal (TMR = V1); externally programmable down to ~400 µs (TMR floating) or up to 27 ms (CTMR = 2.2 nF) |
| Quiescent Current | 30 µA typical at 25°C, enabling low-power always-on monitoring in battery-backed automotive modules |
| Operating Temp | –40°C to +125°C (H-grade), qualified for under-hood automotive electronics and industrial control environments |
Pinout & Package
Package: 8-lead (3 mm × 2 mm) plastic DFN with exposed pad (Pin 9 = GND, optional PCB connection). Thermal resistance θJA = 76°C/W supports high-reliability operation in thermally constrained automotive PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PFI | Power-fail input | Monitors system primary supply via resistive divider; asserts PFO low when voltage falls below 500 mV |
| ADJ | Adjustable monitor input | Configurable third-supply threshold (500 mV reference); used with resistor divider for custom rail monitoring |
| TMR | Reset timeout/latch control | Selects internal 200 ms timeout (TMR = V1), external RC timeout (TMR to GND), or latches RST (TMR = GND) |
| GND | Device ground | Reference for all analog comparators and digital outputs; exposed pad must be connected to PCB ground plane |
| V2 | 5V supply monitor input | Fixed 5V (–6.5%) undervoltage detector; supplies internal VCC when > V1 |
| V1 | 3.3V supply monitor input | Fixed 3.3V (–6.5%) undervoltage detector; primary VCC source if V2 < V1; powers RST/PFO pull-ups |
| PFO | Power-fail logic output | Open-drain output asserting low on PFI under-voltage; provides early warning for controlled shutdown |
| RST | Reset logic output | Open-drain reset output asserting low when any monitored supply (V1/V2/ADJ) falls below threshold |
Key Features
| Feature | Design Value |
|---|---|
| Triple simultaneous monitoring | Independent 3.3V, 5V, and adjustable thresholds enable single-chip supervision of multi-rail systems without external logic |
| ±1.5% threshold accuracy | Guaranteed over –40°C to +125°C eliminates need for derating margins in automotive thermal environments |
| Ultralow 0.5V guaranteed operation | RST and PFO remain functional down to VCC = 0.5V, preventing indeterminate states during brownout conditions |
| Glitch-immune comparators | Input filtering rejects transients ≤100 ns at 10% overdrive, ensuring robust reset behavior in noisy automotive ECU environments |
| Latch-enabled margin testing | TMR pin latches RST state indefinitely, allowing safe voltage margining without unintended system resets |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC Power Sequencing |
|---|---|
Use Scenario: Monitors 3.3V microcontroller core supply, 5V sensor interface rail, and 12V battery-derived auxiliary supply via ADJ divider in under-hood ECU. IC Role / Device Role / Timing Role: Triple-supply supervisor providing synchronized reset assertion and early PFO warning before main MCU brownout. Use Value: Prevents firmware corruption during cold cranking by guaranteeing RST remains asserted until all rails stabilize above ±1.5% thresholds. | Use Scenario: Supervises 3.3V FPGA configuration rail, 5V I/O rail, and 24V fieldbus supply (via ADJ) in modular PLC backplane. IC Role / Device Role / Timing Role: Centralized power-good manager coordinating startup sequence and detecting undervoltage faults across distributed modules. Use Value: Enables deterministic power-up timing with 200 ms internal timeout, eliminating need for external RC timing components. |
| Network Server Baseboard Management | Medical Diagnostic Imaging Power System |
Use Scenario: Tracks 3.3V BMC processor rail, 5V PCIe switch rail, and 12V fan controller supply (via ADJ) in redundant server PSU architecture. IC Role / Device Role / Timing Role: Fault-detection node feeding PFO to BMC interrupt line and RST to hot-swap controller enable. Use Value: Provides early PFI warning (≤8 µs propagation delay) to initiate graceful shutdown before critical rail collapse. | Use Scenario: Monitors 3.3V ADC reference rail, 5V motor driver rail, and isolated 15V X-ray tube bias supply (via ADJ) in portable imaging device. IC Role / Device Role / Timing Role: Safety-critical supervisor enforcing dual-redundant reset paths and latch-mode verification during pre-scan calibration. Use Value: H-grade temperature rating ensures stable operation during extended thermal soak tests at 125°C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6369AUT+T | Fixed 3.3V/5V/12V thresholds; no adjustable ADJ input; 140 ms fixed timeout; ±2.5% threshold accuracy | Lacks configurability for non-standard rails; lower accuracy increases design margin requirements | Choose only if ADJ flexibility and ±1.5% accuracy are not required and 12V monitoring is needed instead of adjustable |
| TPS3808G33DBVR | Single 3.3V monitor only; no V2 or ADJ inputs; no PFI comparator; 200 ms fixed timeout; ±0.5% accuracy | Cannot replace triple-monitor function; requires two additional supervisors for full LTC2911HDDB-1#TRPBF coverage | Use only as partial replacement where only 3.3V supervision is needed and highest accuracy is critical |
Compared with MAX6369AUT+T and TPS3808G33DBVR, the LTC2911HDDB-1#TRPBF uniquely combines ±1.5% accuracy across three rails, adjustable ADJ input, integrated PFI warning, and latch-mode margining - making it the sole option for space-constrained automotive and industrial designs requiring full triple-supply coverage with H-grade reliability.
Availability
LTC2911HDDB-1#TRPBF is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLCs, network server baseboards, and medical diagnostic imaging systems requiring stable component supply across extended temperature ranges.
Supply support for LTC2911HDDB-1#TRPBF 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 designed specifically for high-accuracy, low-power supply monitoring in safety-critical automotive and industrial systems, emphasizing ±1.5% threshold stability over –40°C to +125°C and robust noise immunity.
FAQ
What is the guaranteed minimum operating voltage for LTC2911HDDB-1#TRPBF to assert RST and PFO correctly?
The LTC2911HDDB-1#TRPBF guarantees correct RST and PFO assertion down to VCC = 0.5V, enabled by proprietary low-voltage drive circuitry. This ensures deterministic reset behavior during deep brownout conditions common in automotive start-stop systems, where supply rails may dip below 1V before recovery. The specification is validated across the full –40°C to +125°C operating range.
How does the LTC2911HDDB-1#TRPBF determine its internal supply voltage (VCC)?
The LTC2911HDDB-1#TRPBF derives its internal VCC from the higher of the V1 (3.3V) or V2 (5V) input voltages. For the LTC2911HDDB-1#TRPBF variant, V2 is configured for 5V monitoring, so VCC is sourced from whichever rail reaches voltage first and remains higher. This dual-input power architecture eliminates dependency on a single supply and improves system resilience during asymmetric power sequencing.
Can the LTC2911HDDB-1#TRPBF monitor a 12V supply using the ADJ input?
Yes, the LTC2911HDDB-1#TRPBF can monitor a 12V supply using the ADJ input with an external resistive divider. Since ADJ has a nominal 500 mV threshold, a divider ratio of 24:1 (e.g., 2.4 MΩ top, 100 kΩ bottom) sets the trip point at 12V. Resistor tolerance ≤0.1% and low-temperature-coefficient types are recommended to maintain ±1.5% overall accuracy, consistent with the device's specified performance.
What is the propagation delay from PFI under-voltage to PFO assertion for LTC2911HDDB-1#TRPBF?
The propagation delay from PFI falling below threshold to PFO assertion is 8 µs minimum, 30 µs typical, and 80 µs maximum over the full –40°C to +125°C range. This fast response enables timely early-warning signaling for critical systems like automotive ECUs, where microseconds matter for initiating controlled shutdown sequences before data loss occurs.
Does the LTC2911HDDB-1#TRPBF require external pull-up resistors on RST and PFO pins?
The LTC2911HDDB-1#TRPBF provides internal weak pull-ups to V1 on both RST and PFO (typically 29 µA at V1 = 3.3V), sufficient for high-impedance loads. However, external pull-up resistors are required to achieve VOH > V1 or faster rise times in low-impedance applications. For example, a 10 kΩ pull-up to 5V ensures VOH ≥ 4.8V and reduces rise time to <100 ns in typical microcontroller reset circuits.
LTC2911HDDB-1#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x2)
LTC2911HDDB-1#TRPBF FAQ
1.How can I place an order for LTC2911HDDB-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2911HDDB-1#TRPBF 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-1#TRPBF reliable?
The price and inventory of LTC2911HDDB-1#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2911HDDB-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2911HDDB-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2911HDDB-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2911HDDB-1#TRPBF?
LTC2911HDDB-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2911HDDB-1#TRPBF 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-1#TRPBF?
For technical support, including LTC2911HDDB-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2911HDDB-1#TRPBF requirements.
6.How does Aetrix verify that LTC2911HDDB-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2911HDDB-1#TRPBF 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-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2911HDDB-1#TRPBF?
All LTC2911HDDB-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2911HDDB-1#TRPBF, 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-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC2911HDDB-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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