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Analog Devices Inc. LTC2911ITS8-2#TRMPBF
- Part No.:
- LTC2911ITS8-2#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
LTC2911ITS8-2#TRMPBF.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:500
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Product details
Overview
LTC2911ITS8-2#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), 2.5V (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. Used in industrial power sequencing and margin testing of DC/DC-converter-based systems.
For engineers reviewing the LTC2911ITS8-2#TRMPBF datasheet, LTC2911ITS8-2#TRMPBF pinout, LTC2911ITS8-2#TRMPBF application, or LTC2911ITS8-2#TRMPBF equivalent, key selection criteria include its fixed 3.3V/2.5V dual-supply monitoring configuration, TSOT-23-8 package, latch-enabled margining capability, PFI-driven early power-fail warning, and guaranteed operation at ultralow 0.5V supply voltage.
Technical Context
The LTC2911ITS8-2#TRMPBF implements three independent voltage comparators: one fixed 3.086V threshold on V1, one fixed 2.338V threshold on V2 (for 2.5V –6.5%), and one 500mV nominal threshold on ADJ for resistive-divider-configurable supplies. Its internal VCC is derived from the higher of V1 or V2, enabling autonomous operation without external bias.
It integrates a dedicated power-fail comparator (PFI → PFO) with 500mV falling-edge threshold and 15mV hysteresis, plus TMR-controlled functionality: internal 200ms timeout when tied to V1, external capacitor timing (9.4ms/nF), or latch mode when pulled to GND - all verified across industrial temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| V1 Threshold | 3.086V ±1.5% - precisely monitors 3.3V supply at –6.5% tolerance, eliminating false resets within spec |
| V2 Threshold | 2.338V ±1.5% - factory-set for 2.5V supply monitoring; no external resistor required |
| ADJ Threshold | 500mV ±1.5% - enables configurable third supply trip point via resistive divider |
| PFI Threshold | 500mV falling / 515mV rising - provides noise-immune early warning of primary supply collapse |
| Reset Timeout | 200ms internal (TMR = V1) - eliminates external timing capacitor for simplified layout |
| Supply Current | 30µA typical - enables always-on monitoring in low-power industrial systems |
| Min Operating VCC | 0.5V - ensures valid RST/PFO logic states during brownout and power-up sequencing |
Pinout & Package
Package: 8-Lead Plastic TSOT-23 (TS8), 3mm × 1.75mm footprint, exposed pad optional, θJA = 195°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PFI | Power-fail input | Accepts resistive-divider-scaled voltage; triggers PFO low at 500mV falling edge for early shutdown signaling |
| ADJ | Adjustable monitor input | 500mV threshold comparator input; used with external divider to set third supply trip point |
| TMR | Reset timeout/latch control | Configures timeout mode (V1 = 200ms, cap-to-GND = adjustable, GND = latch RST state) |
| GND | Device ground reference | Common return for all analog and digital functions; exposed pad may be connected |
| V2 | 2.5V supply monitor input | Fixed 2.338V threshold input; monitors 2.5V rail with ±1.5% accuracy over full temp range |
| V1 | 3.3V supply monitor input & VCC source | Fixed 3.086V threshold; supplies internal VCC when ≥ V2; requires 0.1µF bypass |
| PFO | Power-fail logic output | Open-drain output pulled up to V1; asserts low on PFI < 500mV for system-level fail warning |
| RST | Reset logic output | Open-drain reset output pulled up to V1; goes low if any monitored supply falls below threshold |
Key Features
| Feature | Design Value |
|---|---|
| Triple simultaneous monitoring | Monitors 3.3V, 2.5V, and adjustable supply in single TSOT-23-8 IC - reduces BOM count vs discrete supervisors |
| ±1.5% threshold accuracy | Guaranteed over –40°C to +85°C - minimizes system voltage margin and avoids overdesign |
| Ultralow 0.5V VCC operation | Ensures deterministic RST/PFO logic states during deep brownout - prevents MCU lockup |
| Configurable reset timeout | Internal 200ms or external capacitor (9.4ms/nF) - eliminates need for RC network in most designs |
| Reset latch for margin testing | Pulling TMR to GND freezes RST state - enables stable voltage margining without spurious resets |
Applications
| Industrial Power Sequencing | Automotive Body Control Module |
|---|---|
Use Scenario: Coordinating startup/shutdown order of multiple DC/DC converters in programmable logic controllers. IC Role / Device Role / Timing Role: Triple-supply monitor ensures 3.3V I/O, 2.5V core, and auxiliary rail are stable before releasing FPGA/CPU reset. Use Value: Prevents logic contention and latch-up by enforcing strict voltage sequencing with ±1.5% threshold precision. | Use Scenario: Monitoring battery-backed microcontroller supply and CAN transceiver rails in vehicle door modules. IC Role / Device Role / Timing Role: LTC2911ITS8-2#TRMPBF supervises 3.3V MCU rail, 2.5V CAN PHY rail, and backup 5V battery rail via ADJ divider. Use Value: Enables early PFO-triggered CAN bus shutdown before main supply collapse - preserves message integrity. |
| Network Equipment Margin Testing | Medical Diagnostic Imaging PSU |
Use Scenario: Validating voltage tolerance margins of 3.3V/2.5V rails under load in Ethernet switch ASIC power domains. IC Role / Device Role / Timing Role: TMR pin latched to GND holds RST low while supply is swept - isolates margin test from reset assertion. Use Value: Eliminates need for external reset hold circuitry - simplifies test fixture design and improves repeatability. | Use Scenario: Supervising isolated 3.3V logic, 2.5V ADC reference, and adjustable high-voltage bias supply in X-ray detector front-end. IC Role / Device Role / Timing Role: ADJ input monitors HV bias rail via precision divider; PFI tracks main 24V input for predictive failure warning. Use Value: Dual-warning capability (RST for critical fault, PFO for pre-failure) meets IEC 62304 safety requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6316US29D3+T | Fixed 2.93V reset threshold; no PFI input or adjustable monitor; only dual-supply monitoring | Lacks power-fail warning and third adjustable input - unsuitable for predictive shutdown or multi-rail validation | Select only if system requires only 3.3V/2.5V monitoring without early warning or margining |
| TPS3808G33DBVR | Single 3.3V supervisor; no V2/ADJ inputs; no PFI; 200ms fixed timeout only | Cannot monitor 2.5V rail or provide PFO signal - requires additional ICs for full LTC2911ITS8-2#TRMPBF functionality | Choose only for cost-sensitive single-rail applications where PFI and dual-threshold monitoring are unnecessary |
Compared with MAX6316US29D3+T and TPS3808G33DBVR, the LTC2911ITS8-2#TRMPBF uniquely integrates triple-supply monitoring, PFI-driven early warning, and TMR-latch margining in one TSOT-23-8 package - reducing board area and enabling predictive power management not possible with single- or dual-rail alternatives.
Availability
LTC2911ITS8-2#TRMPBF is available at Aetrix Electronics and suitable for industrial power sequencing, automotive body control modules, network equipment margin testing, and medical diagnostic imaging power supplies requiring stable component supply and long-term lifecycle support.
Supply support for LTC2911ITS8-2#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC2911 family was designed specifically for high-accuracy, low-power multi-rail supervision in space-constrained industrial and automotive systems - emphasizing ±1.5% threshold stability, ultralow-VCC operation, and integrated power-fail warning.
FAQ
What is the exact V2 threshold voltage for LTC2911ITS8-2#TRMPBF?
The LTC2911ITS8-2#TRMPBF has a factory-trimmed V2 threshold of 2.338V ±1.5% over –40°C to +85°C, corresponding to a –6.5% trip point for a nominal 2.5V supply. This value is specified in the Electrical Characteristics table under VRT25 parameter and applies across the full industrial temperature range without external calibration.
Does LTC2911ITS8-2#TRMPBF require an external capacitor for reset timeout?
No, LTC2911ITS8-2#TRMPBF does not require an external capacitor for reset timeout. When the TMR pin is tied directly to V1, it activates the internal 200ms timeout generator - eliminating the need for external timing components and simplifying PCB layout while maintaining ±30% accuracy over temperature.
Can LTC2911ITS8-2#TRMPBF monitor a 1.8V supply instead of 2.5V?
No, LTC2911ITS8-2#TRMPBF is specifically configured for 3.3V/2.5V monitoring (LTC2911-2 variant). To monitor 1.8V, the correct part is LTC2911ITS8-3#TRMPBF (LTC2911-3), which has a 1.683V V2 threshold. Using LTC2911ITS8-2#TRMPBF for 1.8V would result in undervoltage detection failure due to mismatched trip point.
How does the PFI input function in LTC2911ITS8-2#TRMPBF?
The PFI input in LTC2911ITS8-2#TRMPBF is a dedicated 500mV threshold comparator that drives the PFO output low when the applied voltage falls below 500mV (with 15mV hysteresis). It is intended for connection to a resistive divider from a primary supply (e.g., 12V input or Li-ion stack) to provide early power-fail warning before RST asserts - enabling controlled system shutdown.
What is the minimum supply voltage that guarantees valid RST and PFO outputs for LTC2911ITS8-2#TRMPBF?
LTC2911ITS8-2#TRMPBF guarantees valid RST and PFO logic states down to 0.5V VCC - the lowest operating voltage among industry-standard supervisors. This ensures deterministic reset behavior during severe brownout conditions and allows safe power-up sequencing even when V1/V2 ramp slowly or asymmetrically.
LTC2911ITS8-2#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:
- 2.338V, 3.086V, Adj
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- Adjustable/Selectable
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-8
LTC2911ITS8-2#TRMPBF FAQ
1.How can I place an order for LTC2911ITS8-2#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2911ITS8-2#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 LTC2911ITS8-2#TRMPBF reliable?
The price and inventory of LTC2911ITS8-2#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2911ITS8-2#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC2911ITS8-2#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2911ITS8-2#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2911ITS8-2#TRMPBF?
LTC2911ITS8-2#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2911ITS8-2#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 LTC2911ITS8-2#TRMPBF?
For technical support, including LTC2911ITS8-2#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2911ITS8-2#TRMPBF requirements.
6.How does Aetrix verify that LTC2911ITS8-2#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC2911ITS8-2#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 LTC2911ITS8-2#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC2911ITS8-2#TRMPBF?
All LTC2911ITS8-2#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2911ITS8-2#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 LTC2911ITS8-2#TRMPBF part is unused and in its original packaging.
Return procedure for LTC2911ITS8-2#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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