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Analog Devices Inc. LTC2911HDDB-1#TRMPBF
- Part No.:
- LTC2911HDDB-1#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC2911HDDB-1#TRMPBF.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,992
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Product details
Overview
LTC2911HDDB-1#TRMPBF from Analog Devices (formerly Linear Technology) is a precision triple supply monitor IC with integrated power-fail comparator and latched reset control. It monitors 3.3V (V1), 5V (V2), and an adjustable input (ADJ) with ±1.5% threshold accuracy over –40°C to +125°C, supports internal 200ms reset timeout, and delivers ultralow 30µA quiescent current. It is used in automotive engine control units for simultaneous rail supervision and early brownout warning.
For engineers reviewing the LTC2911HDDB-1#TRMPBF datasheet, LTC2911HDDB-1#TRMPBF pinout, LTC2911HDDB-1#TRMPBF application, or LTC2911HDDB-1#TRMPBF equivalent, key selection criteria include its H-grade automotive temperature range, DFN-8 (3mm × 2mm) package with exposed pad, triple independent voltage monitoring capability, PFI/PFO power-fail signaling, and TMR-controlled latch mode for margin testing.
Technical Context
The LTC2911HDDB-1#TRMPBF implements three independent comparators: V1 fixed at 3.3V (–6.5% = 3.086V), V2 fixed at 5V (–6.5% = 4.675V), and ADJ with 500mV nominal threshold. Its internal VCC is derived from the higher of V1 or V2, enabling operation down to 0.5V supply.
It features dual-mode timing control: external capacitor on TMR sets timeout (e.g., 2.2nF → 20ms), while tying TMR to V1 enables factory-trimmed 200ms internal timeout. The PFI comparator provides 500mV falling-edge threshold with 15mV hysteresis, and RST output remains valid down to VCC = 0.5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| V1 Threshold | 3.086V ±1.5% - guarantees reliable 3.3V rail supervision across full automotive temperature range. |
| V2 Threshold | 4.675V ±1.5% - ensures accurate 5V supply monitoring without external resistor calibration. |
| ADJ Threshold | 500mV ±1.5% - enables precise configuration of third rail trip point via resistive divider. |
| PFI Threshold | 500mV falling / 515mV rising - provides noise-immune early-warning power-fail detection with 3% hysteresis. |
| Quiescent Current | 30µA typical - minimizes load on monitored supplies in always-on automotive subsystems. |
| Reset Timeout | 200ms internal or 15–27ms external (CTMR = 2.2nF) - configurable delay prevents spurious resets during supply ramp-up. |
| Operating Temp | –40°C to +125°C - qualified for under-hood automotive applications per AEC-Q100 stress requirements. |
Pinout & Package
Package: 8-lead (3mm × 2mm) plastic DFN with exposed pad (pin 9), RoHS-compliant, moisture sensitivity level 1. Thermal resistance θJA = 76°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PFI | Power-fail input | Monitors system primary supply via resistive divider; triggers PFO low at 500mV falling edge. |
| ADJ | Adjustable monitor input | Third comparator input with 500mV threshold; configured with external divider for custom rail monitoring. |
| TMR | Reset timeout/latch control | Configures reset delay (capacitor) or enables 200ms internal timeout (tied to V1); pulls low to latch RST state. |
| GND | Device ground reference | Common return path for all analog and digital circuitry; exposed pad must be connected to PCB ground plane. |
| V2 | 5V supply monitor input | Dedicated 5V rail input with –6.5% threshold (4.675V); supplies internal VCC when > V1. |
| V1 | 3.3V supply monitor input | Dedicated 3.3V rail input with –6.5% threshold (3.086V); always powers internal circuitry if V2 < V1. |
| PFO | Power-fail logic output | Open-drain output pulled low when PFI < 500mV; signals imminent supply collapse before RST asserts. |
| RST | Reset logic output | Open-drain reset output asserted low if any monitored input falls below threshold for timeout period. |
Key Features
| Feature | Design Value |
|---|---|
| Triple independent voltage monitoring | Simultaneous supervision of 3.3V, 5V, and user-configurable rail eliminates need for multiple discrete supervisors. |
| Ultralow 0.5V guaranteed operation | Ensures deterministic RST/PFO behavior during deep brownout or battery sag conditions common in automotive start-stop systems. |
| Programmable reset timeout | Supports both internal 200ms default and external capacitor-based timing (9.4ms/nF), simplifying BOM and layout. |
| Power-fail comparator with hysteresis | 500mV/515mV thresholds provide robust early-warning detection immune to supply ripple and noise. |
| Reset latch mode | TMR pin pull-down holds RST state indefinitely, enabling controlled voltage margining without unintended system reset. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC Power Management |
|---|---|
Use Scenario: Supervises 3.3V microcontroller core, 5V sensor interface, and 12V battery-derived auxiliary rail in diesel ECU. IC Role / Device Role / Timing Role: Triple-rail monitor with PFO-driven NMI interrupt and latched RST for safe firmware update sequencing. Use Value: Prevents undefined MCU behavior during cold-crank battery dip (down to 6V) by asserting RST only after validated timeout and maintaining PFO warning at 9V. |
Use Scenario: Monitors redundant 24V DC inputs, 5V logic rail, and 3.3V FPGA I/O supply in modular PLC backplane. IC Role / Device Role / Timing Role: Centralized supply integrity checker with PFO linked to watchdog timer and RST synchronized to fieldbus communication cycle. Use Value: Enables graceful I/O module shutdown before main CPU reset, preserving process data in nonvolatile memory during AC line sag. |
| Network Server Baseboard Management | Medical Diagnostic Imaging Power Sequencing |
Use Scenario: Validates 12V, 5V, and 3.3V rails on server motherboard prior to BMC initialization and PCIe enumeration. IC Role / Device Role / Timing Role: Primary reset supervisor with PFO feeding BMC power-fail alert and TMR enabling BIOS-level voltage margin tests. Use Value: Guarantees 200ms minimum hold time on RST to prevent premature boot under transient load surges during power-up. |
Use Scenario: Controls power sequencing for X-ray detector ASICs requiring strict 3.3V→5V→12V ramp order with fault interlock. IC Role / Device Role / Timing Role: Safety-critical rail monitor where ADJ configures 12V trip point and PFO triggers emergency beam cutoff. Use Value: Meets IEC 62304 Class C software safety requirements via deterministic 1.5% threshold accuracy and glitch-filtered comparators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6369KA29+T | Fixed 2.93V/3.08V/3.3V thresholds; no PFI/PFO; 140ms fixed timeout; SO-8 package. | Lacks power-fail warning and adjustable third input; suitable only for simpler 3.3V-centric systems. | Select when PFI functionality is unnecessary and board space allows SO-8; not drop-in due to different pinout and missing latch mode. |
| TPS3808G33DBVR | Single 3.3V supervisor; no V2/ADJ/PFI; 200ms timeout; SOT-23-6 package. | Cannot monitor multiple rails simultaneously; requires additional ICs for full triple-rail coverage. | Choose only for cost-sensitive single-rail applications; not functionally equivalent-requires redesign for triple monitoring. |
Compared with MAX6369KA29+T and TPS3808G33DBVR, the LTC2911HDDB-1#TRMPBF uniquely integrates triple-rail monitoring, programmable PFI threshold, and TMR latch in a space-efficient DFN-8, making it the sole option meeting automotive AEC-Q100 H-grade and functional safety requirements for complex multi-rail systems.
Availability
LTC2911HDDB-1#TRMPBF is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLCs, network server baseboards, and medical imaging systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC2911HDDB-1#TRMPBF 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 digital signal processing semiconductors.
The LTC2911 family was designed specifically for automotive and industrial applications demanding high-accuracy, multi-rail supply monitoring with fail-safe power-fail warning and margin-test-ready latch functionality.
FAQ
What is the operating temperature range of the LTC2911HDDB-1#TRMPBF?
The LTC2911HDDB-1#TRMPBF is rated for –40°C to +125°C, qualifying it for under-hood automotive applications and high-temperature industrial environments. This H-grade specification is confirmed in the Absolute Maximum Ratings table and applies across all electrical parameters unless otherwise noted.
Does the LTC2911HDDB-1#TRMPBF support external reset timeout configuration?
Yes, the LTC2911HDDB-1#TRMPBF supports external timeout via a capacitor on the TMR pin. With CTMR = 2.2nF, the timeout is 15–27ms; the device also supports internal 200ms timeout when TMR is tied to V1. Both modes are fully characterized and guaranteed over temperature.
How does the PFI input function in the LTC2911HDDB-1#TRMPBF?
The PFI input in the LTC2911HDDB-1#TRMPBF monitors a system supply via resistive divider and triggers the PFO output low when voltage falls below 500mV (falling edge). It features 15mV hysteresis (515mV rising edge) to reject noise, providing early warning of power failure before RST asserts.
Can the LTC2911HDDB-1#TRMPBF monitor a 1.2V supply?
No-the LTC2911HDDB-1#TRMPBF variant is fixed for 3.3V (V1) and 5V (V2) monitoring. For 1.2V, the LTC2911-4 variant is required. The "-1" suffix in LTC2911HDDB-1#TRMPBF explicitly denotes the 3.3V/5V configuration per the Product Selection Guide.
What is the purpose of the exposed pad on the DFN package of the LTC2911HDDB-1#TRMPBF?
The exposed pad (pin 9) on the LTC2911HDDB-1#TRMPBF's DFN package is electrically connected to GND and must be soldered to the PCB ground plane. It reduces thermal resistance (θJA = 76°C/W) and improves noise immunity-PCB connection is mandatory, not optional, per the Pin Configuration diagram.
LTC2911HDDB-1#TRMPBF 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#TRMPBF FAQ
1.How can I place an order for LTC2911HDDB-1#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2911HDDB-1#TRMPBF 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#TRMPBF reliable?
The price and inventory of LTC2911HDDB-1#TRMPBF 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#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC2911HDDB-1#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2911HDDB-1#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2911HDDB-1#TRMPBF?
LTC2911HDDB-1#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2911HDDB-1#TRMPBF 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#TRMPBF?
For technical support, including LTC2911HDDB-1#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2911HDDB-1#TRMPBF requirements.
6.How does Aetrix verify that LTC2911HDDB-1#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC2911HDDB-1#TRMPBF 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#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC2911HDDB-1#TRMPBF?
All LTC2911HDDB-1#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2911HDDB-1#TRMPBF, 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#TRMPBF part is unused and in its original packaging.
Return procedure for LTC2911HDDB-1#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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