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Analog Devices Inc. LTC2911ITS8-4#TRMPBF
- Part No.:
- LTC2911ITS8-4#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
LTC2911ITS8-4#TRMPBF.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:4,571
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Product details
Overview
LTC2911ITS8-4#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 LTC2911ITS8-4#TRMPBF datasheet, LTC2911ITS8-4#TRMPBF pinout, LTC2911ITS8-4#TRMPBF application, or LTC2911ITS8-4#TRMPBF equivalent, this page delivers verified specifications, TSOT-23-8 package details, functional pin roles, real-world use cases in industrial computing and automotive electronics, and two validated alternative parts with documented technical and application differences.
Technical Context
The LTC2911ITS8-4#TRMPBF implements three independent voltage comparators: V1 fixed at 3.3V (–6.5% = 3.086V), V2 fixed at 1.2V (–6.5% = 1.122V), and ADJ with 500mV nominal threshold. All comparators feature 1.5% total threshold accuracy across temperature and include glitch filtering for noise immunity.
It integrates a power-fail comparator (PFI/PFO) with 500mV falling-edge threshold and 15mV hysteresis, plus TMR-controlled latch mode for margin testing. Reset assertion requires all monitored inputs to remain above thresholds for ≥200ms (internal timeout) before RST releases high.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| V1 Threshold | 3.086V ±1.5% - precisely monitors 3.3V rail with guaranteed trip between 3.036V and 3.135V over full temp range |
| V2 Threshold | 1.122V ±1.5% - fixed 1.2V (–6.5%) undervoltage detection for low-voltage digital supplies |
| ADJ Threshold | 500mV ±1.5% - enables resistive divider configuration of third supply threshold |
| Reset Timeout | 200ms (internal) - eliminates external capacitor; ensures stable release after power stabilization |
| Supply Current | 30µA typical - ultra-low quiescent draw from higher of V1/V2, enabling battery-backed monitoring |
| PFI Threshold | 500mV falling / 515mV rising - provides early warning of supply collapse with 3% hysteresis for noise rejection |
| Operating Temp | –40°C to +85°C - industrial-grade qualification supporting automotive and industrial 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 system primary supply via resistive divider; triggers PFO low at 500mV falling edge |
| ADJ | Adjustable monitor input | 500mV threshold input for configuring third supply trip point using external resistor divider |
| TMR | Reset timeout/latch control | Tied to V1 for 200ms internal timeout; pulled to GND to latch RST state during margin testing |
| GND | Device ground reference | Common return path for all comparators and outputs; exposed pad (if used) must connect to GND |
| V2 | 1.2V supply monitor input | Fixed –6.5% threshold (1.122V) for 1.2V logic rails; high-impedance input minimizes loading |
| V1 | 3.3V supply monitor & VCC source | Primary 3.3V rail monitor (3.086V threshold); supplies internal VCC and pull-ups for RST/PFO |
| PFO | Power-fail open-drain output | Asserts low on PFI under-voltage; weak internal pull-up to V1 (29µA typical); supports external pull-up |
| RST | Reset open-drain output | Asserts low if any monitored supply falls below threshold; latched by TMR; same pull-up behavior as PFO |
Key Features
| Feature | Design Value |
|---|---|
| Triple simultaneous monitoring | Independent 3.3V, 1.2V, and adjustable (500mV) thresholds enable single-chip supervision of multi-rail systems |
| ±1.5% threshold accuracy | Guaranteed over –40°C to +85°C reduces system voltage margin requirements and prevents false resets |
| Internal 200ms reset timeout | Eliminates external timing capacitor, saving board space and improving reliability in compact designs |
| Power-fail comparator with hysteresis | 500mV/515mV thresholds + 15mV hysteresis provide robust early-warning signaling without oscillation |
| Latch-enabled margin testing | TMR pin pull-down holds RST state indefinitely, allowing controlled voltage stress testing without spurious resets |
Applications
| Industrial PLC Power Sequencing | Automotive Infotainment DC/DC Monitoring |
|---|---|
|
Use Scenario: Supervises 3.3V microcontroller core, 1.2V FPGA I/O, and adjustable 5V analog supply in programmable logic controller backplane. IC Role / Device Role / Timing Role: Triple-supply monitor ensuring synchronized power-up and brownout detection before firmware execution. Use Value: Prevents logic corruption during unstable rail transitions using guaranteed 3.036V–3.135V V1 trip window and 200ms timeout. |
Use Scenario: Monitors 3.3V MCU domain, 1.2V SoC core, and 5V display backlight supply in vehicle head unit with Li-ion backup. IC Role / Device Role / Timing Role: Provides early PFO warning when main 12V input drops, triggering graceful shutdown before V1/V2 collapse. Use Value: Enables 500mV PFI threshold to detect 12V-to-5V converter failure 100ms before 1.2V rail fails, preserving NVM state. |
| Network Server Baseboard Management | Medical Diagnostic Imaging Power Integrity |
|
Use Scenario: Embedded in server baseboard to supervise 3.3V BMC, 1.2V CPU VRM feedback, and adjustable 2.5V sensor interface rail. IC Role / Device Role / Timing Role: Delivers precise reset coordination across heterogeneous power domains with minimal BOM count. Use Value: ±1.5% accuracy avoids over-designing 3.3V supply tolerance; ADJ pin configures 2.5V threshold with <0.1% resistor matching. |
Use Scenario: Ensures safe power sequencing for X-ray detector ASICs requiring strict 3.3V, 1.2V, and 5V supply validation before exposure. IC Role / Device Role / Timing Role: Latch mode (TMR) enables in-system margin testing of 1.2V rail while maintaining RST assertion. Use Value: TMR latch holds RST low during voltage stress, preventing unintended ASIC initialization until all rails are verified. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6314US29D3+T | Fixed 2.93V reset threshold only; dual-supply monitor (VCC + VPOR); no PFI/PFO or ADJ input | Lacks third monitor channel and power-fail warning; suitable only for basic dual-rail systems | Select only if monitoring only two supplies and no early-warning capability is needed |
| TPS3808G12QDBVRQ1 | Single 1.2V supervisor; no V1/V2/ADJ flexibility; automotive AEC-Q100 qualified; 200ms timeout | Cannot monitor 3.3V + 1.2V simultaneously; requires separate ICs for multi-rail coverage | Choose when only 1.2V rail supervision is required in automotive environments with AEC-Q100 compliance |
Compared with MAX6314US29D3+T and TPS3808G12QDBVRQ1, the LTC2911ITS8-4#TRMPBF uniquely integrates triple-rail monitoring, power-fail warning, and latch-mode margin testing in one TSOT-23-8 package-enabling compact, high-integrity power supervision unattainable with single- or dual-channel alternatives.
Availability
LTC2911ITS8-4#TRMPBF is available at Aetrix Electronics and suitable for industrial PLCs, automotive infotainment systems, and medical imaging equipment requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
Supply support for LTC2911ITS8-4#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 and maintains its high-precision analog and power management product lines with rigorous automotive and industrial qualification standards.
The LTC2911 series is designed for mission-critical power integrity in multi-rail embedded systems, delivering precision voltage monitoring, power-fail warning, and margin-test-ready latch functionality in space-constrained applications.
FAQ
What is the exact V2 threshold voltage for LTC2911ITS8-4#TRMPBF?
The LTC2911ITS8-4#TRMPBF has a fixed V2 threshold of 1.122V (1.2V – 6.5%), guaranteed between 1.104V and 1.140V over –40°C to +85°C per the datasheet's VRT12 parameter. This value is factory-trimmed and applies specifically to the "-4" variant, which configures V2 for 1.2V monitoring.
Does LTC2911ITS8-4#TRMPBF require an external capacitor for reset timeout?
No. The LTC2911ITS8-4#TRMPBF uses an internal 200ms timeout when the TMR pin is tied to V1. External capacitors are optional only if a different timeout (e.g., 20ms with 2.2nF) is needed. The "-4" suffix confirms factory configuration for internal timing, eliminating capacitor dependency.
Can LTC2911ITS8-4#TRMPBF monitor a 5V supply?
No. The LTC2911ITS8-4#TRMPBF is the "-4" variant, configured exclusively for 3.3V (V1) and 1.2V (V2) monitoring. To monitor 5V, select LTC2911ITS8-1#TRMPBF. The V2 pin threshold is hardwired per variant and cannot be reconfigured in-circuit.
What is the minimum operating voltage for LTC2911ITS8-4#TRMPBF to guarantee RST/PFO operation?
The LTC2911ITS8-4#TRMPBF guarantees RST and PFO output functionality down to VCC = 0.5V, as confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables. This enables reliable reset assertion even during deep brownout conditions where V1 or V2 drops near 0.5V.
How does the PFI input function in LTC2911ITS8-4#TRMPBF?
The PFI input in LTC2911ITS8-4#TRMPBF provides a dedicated 500mV falling-edge threshold for early power-fail detection. When the voltage at PFI falls below 500mV (e.g., via resistive divider from a 12V rail), PFO asserts low-giving the system time to save state before V1/V2 collapse. Hysteresis of 15mV prevents chatter near the threshold.
LTC2911ITS8-4#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:
- 1.122V, 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
LTC2911ITS8-4#TRMPBF FAQ
1.How can I place an order for LTC2911ITS8-4#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2911ITS8-4#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 LTC2911ITS8-4#TRMPBF reliable?
The price and inventory of LTC2911ITS8-4#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2911ITS8-4#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC2911ITS8-4#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2911ITS8-4#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2911ITS8-4#TRMPBF?
LTC2911ITS8-4#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2911ITS8-4#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 LTC2911ITS8-4#TRMPBF?
For technical support, including LTC2911ITS8-4#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2911ITS8-4#TRMPBF requirements.
6.How does Aetrix verify that LTC2911ITS8-4#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC2911ITS8-4#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 LTC2911ITS8-4#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC2911ITS8-4#TRMPBF?
All LTC2911ITS8-4#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2911ITS8-4#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 LTC2911ITS8-4#TRMPBF part is unused and in its original packaging.
Return procedure for LTC2911ITS8-4#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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