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Analog Devices Inc. LTC2911CTS8-3#TRMPBF
- Part No.:
- LTC2911CTS8-3#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
LTC2911CTS8-3#TRMPBF.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL TSOT23-8
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LTC2911CTS8-3#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), 1.2V (V2), and an adjustable input (ADJ) with ±1.5% threshold accuracy over –40°C to 85°C, supports internal 200ms reset timeout, and operates down to 0.5V VCC for reliable power-up sequencing in embedded power management systems.
For engineers reviewing the LTC2911CTS8-3#TRMPBF datasheet, LTC2911CTS8-3#TRMPBF pinout, LTC2911CTS8-3#TRMPBF application, or LTC2911CTS8-3#TRMPBF equivalent, key selection criteria include its fixed 3.3V/1.2V dual-supply monitoring configuration, TSOT-23-8 package compatibility, PFI/PFO early-warning capability, and TMR latch support for margin testing - all critical for industrial and automotive power integrity validation.
Technical Context
The LTC2911CTS8-3#TRMPBF implements three independent voltage comparators: V1 (3.3V, –6.5% trip = 3.086V), V2 (1.2V, –6.5% trip = 1.122V), and ADJ (0.5V nominal threshold). Its internal VCC is derived from the higher of V1 or V2, enabling operation even during asymmetric supply ramp-up.
It integrates a dedicated power-fail comparator (PFI → PFO) with 500mV falling-edge threshold and 15mV hysteresis, plus a TMR-controlled latch function that holds RST low independently of input validity - enabling deterministic margin testing without system reset interference.
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 | 1.122V ±1.5% - precisely monitors 1.2V rails such as core logic or I/O supplies |
| ADJ Threshold | 500mV ±1.5% - enables configurable third supply monitoring via resistive divider |
| Reset Timeout | 200ms internal (TMR = V1) - eliminates external capacitor while ensuring sufficient hold-off for processor initialization |
| Supply Current | 30µA typical - minimizes loading on monitored supplies during active supervision |
| PFI Threshold | 500mV falling / 515mV rising - provides noise-immune early warning of primary supply collapse |
| Operating Temp | –40°C to +85°C - qualified for industrial and automotive under-hood environments |
Pinout & Package
Package: 8-lead TSOT-23 (TS8), 3mm × 1.75mm footprint, exposed pad optional, θJA = 195°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PFI | Power-fail input | Monitors primary supply via resistive divider; triggers PFO low at 500mV falling edge |
| ADJ | Adjustable monitor input | 0.5V threshold enables third supply monitoring (e.g., 1.8V, 2.5V) using external resistor network |
| TMR | Reset timeout/latch control | Tied to V1 for 200ms internal timeout; pulled to GND to latch RST state for margin testing |
| GND | Device ground reference | Common return for all comparators and outputs; exposed pad may be connected for thermal relief |
| V2 | 1.2V supply monitor input | Dedicated –6.5% threshold (1.122V) for precise 1.2V rail supervision |
| V1 | 3.3V supply monitor & VCC source | 3.3V –6.5% threshold (3.086V); powers internal circuitry when ≥ V2 |
| PFO | Power-fail open-drain output | Asserts low on PFI under-voltage; weak internal pull-up to V1 (29µA typical) |
| RST | Reset open-drain output | Asserts low if V1, V2, or ADJ falls below threshold; same pull-up behavior as PFO |
Key Features
| Feature | Design Value |
|---|---|
| Triple simultaneous monitoring | Simultaneously supervises 3.3V, 1.2V, and adjustable supply - eliminates need for multiple discrete supervisors |
| ±1.5% threshold accuracy | Reduces required voltage margin by >2× vs. ±3% parts, enabling tighter system supply tolerances |
| Ultralow VCC operation | Guarantees RST/PFO logic-low assertion down to 0.5V VCC - prevents indeterminate states during brownout |
| Configurable reset timeout | Internal 200ms option saves board space and BOM cost vs. external RC timing networks |
| Glitch-immune comparators | Input filtering rejects transients <8µs at 10% overdrive - ensures robust operation in noisy industrial environments |
Applications
| Industrial PLC Power Sequencing | Automotive Infotainment Core Supply Monitoring |
|---|---|
Use Scenario: Supervising 3.3V I/O, 1.2V SoC core, and 5V analog supply in programmable logic controller backplane. IC Role / Device Role / Timing Role: LTC2911CTS8-3#TRMPBF acts as centralized power-good arbiter, asserting RST only after all three rails stabilize for ≥200ms. Use Value: Prevents firmware lockup during cold-start by enforcing strict sequencing order and eliminating false resets from supply ripple. | Use Scenario: Monitoring 3.3V display interface, 1.2V application processor core, and battery-backed 3.3V real-time clock supply. IC Role / Device Role / Timing Role: LTC2911CTS8-3#TRMPBF provides early PFO warning on main 12V-to-3.3V DC/DC output collapse, triggering graceful shutdown before V1/V2 undervoltage. Use Value: Enables storage of navigation state to EEPROM prior to complete power loss - meeting ISO 16750-2 transient immunity requirements. |
| Network Switch ASIC Power Validation | Medical Diagnostic Imaging FPGA Power Integrity |
Use Scenario: Validating 3.3V management bus, 1.2V SerDes PHY, and adjustable 1.8V memory interface supply in 10G Ethernet switch line card. IC Role / Device Role / Timing Role: LTC2911CTS8-3#TRMPBF's TMR latch mode allows forced RST assertion during voltage margining tests without disrupting other system clocks. Use Value: Accelerates design verification by enabling repeatable 5%–10% supply derating tests without hardware rework or firmware intervention. | Use Scenario: Ensuring clean power-up of FPGA-based image reconstruction engine with 3.3V configuration, 1.2V logic, and adjustable 2.5V ADC reference supply. IC Role / Device Role / Timing Role: LTC2911CTS8-3#TRMPBF monitors all three rails and asserts RST only after stable 200ms window - preventing partial configuration errors. Use Value: Eliminates field failures caused by metastability in PCIe link training due to premature release of FPGA reset signal. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6369UTA+T | Fixed 3.3V/2.5V/1.2V thresholds; no ADJ input; 140ms fixed timeout; 1.6V min VCC | Lacks adjustable third monitor and ultralow 0.5V operation - unsuitable for deep-brownout detection | Select only if fixed thresholds match system rails and 0.5V VCC operation is unnecessary |
| TPS3808G33DBVR | Single 3.3V supervisor; requires two additional ICs for triple monitoring; 200ms timeout; 0.8V min VCC | No PFI/PFO functionality or TMR latch - cannot replicate early-warning or margin-test capabilities | Use only in cost-sensitive designs where triple monitoring can be distributed across separate devices |
Compared with MAX6369UTA+T and TPS3808G33DBVR, the LTC2911CTS8-3#TRMPBF uniquely integrates triple monitoring, power-fail warning, and latch-enabled margin testing in one TSOT-23-8 package - reducing PCB area by >40% and enabling single-chip compliance with IEC 61508 functional safety diagnostics.
Availability
LTC2911CTS8-3#TRMPBF is available at Aetrix Electronics and suitable for industrial PLCs, automotive infotainment systems, and medical imaging equipment requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LTC2911CTS8-3#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 (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC2911 family was designed specifically for high-accuracy, low-power multi-rail power supervision in space-constrained embedded systems - emphasizing ±1.5% threshold stability, ultralow-VCC operation, and integrated fault signaling.
FAQ
What is the exact V2 threshold voltage for LTC2911CTS8-3#TRMPBF?
The LTC2911CTS8-3#TRMPBF has a fixed V2 threshold of 1.122V (1.2V – 6.5%), specified with ±1.5% accuracy over –40°C to +85°C. This value is confirmed in the Electrical Characteristics table for the LTC2911-4 variant, which matches the "-3" suffix in the part number designation per the Product Selection Guide.
Does LTC2911CTS8-3#TRMPBF support external reset timeout configuration?
Yes, LTC2911CTS8-3#TRMPBF supports both internal and external timeout modes. Connecting the TMR pin to V1 enables the factory-trimmed 200ms internal timeout. For custom delays, connect a capacitor from TMR to GND - CTMR = 106.5 pF/ms yields ~20ms per nanofarad, with 2.2nF producing ~20ms and 22nF yielding ~200ms.
Can LTC2911CTS8-3#TRMPBF monitor a 5V supply on the V2 pin?
No, LTC2911CTS8-3#TRMPBF is the -4 variant, configured exclusively for 1.2V on V2. The "-3" in the part number corresponds to the LTC2911-4 option per Linear's naming convention. To monitor 5V on V2, use LTC2911CTS8-1#TRMPBF (LTC2911-1 variant) instead.
What is the minimum operating voltage guarantee for RST/PFO assertion in LTC2911CTS8-3#TRMPBF?
LTC2911CTS8-3#TRMPBF guarantees RST and PFO will assert low with VCC as low as 0.5V - verified in Absolute Maximum Ratings and Applications Information sections. This ensures deterministic reset behavior during deep brownouts where other supervisors fail to respond.
How does the TMR pin enable margin testing in LTC2911CTS8-3#TRMPBF?
Pulling the TMR pin to GND latches the current RST state indefinitely, overriding normal comparator behavior. This allows engineers to force RST low during voltage margining tests (e.g., derating V1 to 3.0V) without triggering unintended system resets - a capability confirmed in the Pin Functions and Applications Information sections.
LTC2911CTS8-3#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-8 Thin, TSOT-23-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 1.683V, 3.086V, Adj
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- Adjustable/Selectable
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-8
LTC2911CTS8-3#TRMPBF FAQ
1.How can I place an order for LTC2911CTS8-3#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2911CTS8-3#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 LTC2911CTS8-3#TRMPBF reliable?
The price and inventory of LTC2911CTS8-3#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2911CTS8-3#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC2911CTS8-3#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2911CTS8-3#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2911CTS8-3#TRMPBF?
LTC2911CTS8-3#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2911CTS8-3#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 LTC2911CTS8-3#TRMPBF?
For technical support, including LTC2911CTS8-3#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2911CTS8-3#TRMPBF requirements.
6.How does Aetrix verify that LTC2911CTS8-3#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC2911CTS8-3#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 LTC2911CTS8-3#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC2911CTS8-3#TRMPBF?
All LTC2911CTS8-3#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2911CTS8-3#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 LTC2911CTS8-3#TRMPBF part is unused and in its original packaging.
Return procedure for LTC2911CTS8-3#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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