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Analog Devices Inc. LTC2911CTS8-1#TRPBF
- Part No.:
- LTC2911CTS8-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
LTC2911CTS8-1#TRPBF.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,733
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Product details
Overview
LTC2911CTS8-1#TRPBF 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 85°C, supports internal 200ms reset timeout, and operates down to 0.5V VCC for reliable power-up sequencing in industrial DC/DC systems.
For engineers reviewing the LTC2911CTS8-1#TRPBF datasheet, LTC2911CTS8-1#TRPBF pinout, LTC2911CTS8-1#TRPBF application, or LTC2911CTS8-1#TRPBF equivalent, key selection criteria include its TSOT-23-8 package, guaranteed 3.086V V1 reset threshold, 4.675V V2 reset threshold, 500mV PFI trip point, and latch-enabled margin testing capability.
Technical Context
The LTC2911CTS8-1#TRPBF implements three independent voltage comparators - one fixed at 3.3V (V1), one fixed at 5V (V2), and one adjustable via external resistor divider (ADJ) with 0.5V nominal threshold. All comparators feature 1.5% accuracy across temperature and built-in glitch filtering for noise immunity.
Its power-fail comparator uses a dedicated PFI input with 500mV falling-edge threshold and 515mV rising-edge threshold (3% hysteresis), driving the open-drain PFO output. The TMR pin enables three modes: external capacitor timeout, internal 200ms timeout (TMR = V1), or latched RST state (TMR = GND).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| V1 Reset Threshold | 3.086V (3.3V − 6.5%), ±1.5% accuracy ensures reliable 3.3V rail monitoring without false resets |
| V2 Reset Threshold | 4.675V (5V − 6.5%), ±1.5% accuracy guarantees precise detection of 5V supply undervoltage |
| PFI Threshold | 500mV falling edge, 515mV rising edge - provides noise-immune early warning of primary supply collapse |
| Reset Timeout | Internally fixed 200ms (TMR tied to V1); eliminates need for external timing capacitor in standard designs |
| Supply Current | 30µA typical - enables low-power operation in always-on supervisory circuits |
| Minimum VCC | 0.5V guaranteed - ensures RST/PFO remain valid during brownout and deep power-down |
| Operating Temp | –40°C to +85°C (I-grade) - qualified for industrial and automotive under-hood applications |
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 configurable third supply monitoring (e.g., 12V, 2.5V) using external divider |
| TMR | Reset timeout/latch control | Set to V1 for 200ms internal timeout; pulled to GND to latch RST state for margin testing |
| GND | Device ground reference | Common return for all analog and digital circuitry; exposed pad may be connected |
| V2 | 5V supply monitor input | Fixed 4.675V threshold for accurate 5V rail supervision; bypass with ≥0.1µF capacitor |
| V1 | 3.3V supply monitor & VCC source | Fixed 3.086V threshold; supplies internal VCC and weak pull-ups for RST/PFO outputs |
| PFO | Open-drain power-fail output | Asserts low on PFI < 500mV; provides early warning signal for controlled shutdown |
| RST | Open-drain reset output | Asserts low if V1 < 3.086V, V2 < 4.675V, or ADJ < 0.5V; remains low until timeout expires |
Key Features
| Feature | Design Value |
|---|---|
| Triple simultaneous monitoring | Independent 3.3V, 5V, and adjustable thresholds eliminate need for multiple discrete supervisors |
| ±1.5% threshold accuracy | Reduces required system voltage margin by >1.5% vs. ±2.5% parts, improving design headroom |
| Internal 200ms timeout | Removes external capacitor and associated layout area, simplifying BOM and reducing cost |
| Latch-enabled margin testing | TMR-to-GND forces RST into static state, enabling stable voltage stress testing without spurious resets |
| 0.5V minimum VCC operation | Ensures deterministic RST/PFO behavior during brownout, preventing undefined logic states |
Applications
| Industrial DC/DC Power Sequencing | Automotive Infotainment Supply Monitoring |
|---|---|
Use Scenario: Supervising 3.3V microcontroller core, 5V peripheral bus, and 12V main input in programmable logic controller power tree. IC Role / Device Role / Timing Role: Triple-supply monitor providing synchronized reset assertion and PFO-based pre-shutdown alert. Use Value: Prevents firmware corruption during partial rail collapse by asserting RST only after all three rails fail, while PFO initiates nonvolatile save routines 20–50ms earlier. | Use Scenario: Monitoring 3.3V SoC I/O, 5V display backlight, and battery stack voltage in head-unit ECU. IC Role / Device Role / Timing Role: Primary supervisor with PFI configured to detect Li-ion pack voltage drop below 3.2V. Use Value: PFO interrupt triggers immediate NVM save and graceful UI shutdown before V1/V2 undervoltage causes RST assertion and hard reset. |
| Network Equipment Hot-Swap Control | Medical Diagnostic Imaging Power Integrity |
Use Scenario: Ensuring clean power-up of FPGA, PHY, and auxiliary rails in 1RU switch line card with hot-swap controller. IC Role / Device Role / Timing Role: Reset coordinator that gates FPGA configuration until all rails are stable for ≥200ms. Use Value: Internal 200ms timeout eliminates timing capacitor drift issues, guaranteeing consistent startup delay across temperature and unit lifetime. | Use Scenario: Validating 3.3V sensor interface, 5V ADC reference, and adjustable high-voltage bias supply in portable ultrasound transducer module. IC Role / Device Role / Timing Role: Safety-critical voltage supervisor with latch mode used during factory calibration voltage sweeps. Use Value: TMR latching prevents unintended reset during calibrated voltage margining, ensuring test continuity and data integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6369ESA+ | Fixed 3.3V/5V/12V thresholds; no adjustable ADJ input; 200ms timeout only via external cap | Lacks configurable third monitor; requires external capacitor for timeout; lower accuracy (±2.5%) | Choose when fixed 12V monitoring is needed and ADJ flexibility is unnecessary |
| TPS3808G33DBVR | Single 3.3V monitor only; no V2 or ADJ inputs; no PFI/PFO function; 200ms timeout internal | Cannot replace triple-monitor functionality; suitable only for standalone 3.3V reset | Select only if system requires only 3.3V supervision and other rails are monitored elsewhere |
Compared with MAX6369ESA+ and TPS3808G33DBVR, the LTC2911CTS8-1#TRPBF uniquely delivers three independent, high-accuracy thresholds (including one fully adjustable) plus integrated power-fail signaling in a single TSOT-23 package - enabling compact, robust multi-rail supervision without compromise.
Availability
LTC2911CTS8-1#TRPBF is available at Aetrix Electronics and suitable for industrial DC/DC power sequencing, automotive infotainment supply monitoring, and network equipment hot-swap control requiring stable component supply and long-term lifecycle support.
Supply support for LTC2911CTS8-1#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 semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC2911 family was designed specifically for high-reliability multi-rail power monitoring in space-constrained industrial and automotive systems, emphasizing accuracy, low power, and latch-assisted validation.
FAQ
What is the exact reset threshold voltage for the V1 input of the LTC2911CTS8-1#TRPBF?
The V1 input of the LTC2911CTS8-1#TRPBF has a guaranteed reset threshold of 3.086V (3.3V − 6.5%) with ±1.5% accuracy over the full –40°C to +85°C operating range. This value is fixed and applies specifically to the -1 variant, which is implemented in the LTC2911CTS8-1#TRPBF. The threshold is not user-adjustable and is internally trimmed at wafer test.
Does the LTC2911CTS8-1#TRPBF support an adjustable third monitoring input?
Yes, the LTC2911CTS8-1#TRPBF supports an adjustable third monitoring input via the ADJ pin, which has a nominal 0.5V threshold. A resistive divider connected between the supply to be monitored and ground sets the trip point - for example, a 12V rail can be scaled to 0.5V using appropriate resistor ratios. This functionality is confirmed in the LTC2911 datasheet Figure 2 and Applications Information section.
How is the reset timeout configured on the LTC2911CTS8-1#TRPBF?
The LTC2911CTS8-1#TRPBF supports both internal and external reset timeout. To use the internal 200ms timeout, tie the TMR pin directly to V1. This eliminates the need for an external capacitor and is the default configuration for production use. External timeout (e.g., 20ms) is enabled by connecting a capacitor from TMR to GND, with CTMR ≈ 106.5 pF/ms.
Can the LTC2911CTS8-1#TRPBF operate with supply voltages below 1V?
Yes, the LTC2911CTS8-1#TRPBF guarantees functional operation down to 0.5V VCC, meaning both RST and PFO outputs remain valid and correctly asserted even during severe brownout conditions. This is explicitly specified in the Absolute Maximum Ratings and Electrical Characteristics tables, and verified in the Typical Performance Characteristics (Figure G06).
What is the purpose of the PFI and PFO pins on the LTC2911CTS8-1#TRPBF?
The PFI (Power-Fail Input) pin monitors a primary system supply - such as a DC/DC input or battery stack - via a resistive divider, comparing it to a 500mV falling-edge threshold. When PFI falls below this level, the PFO (Power-Fail Output) pin pulls low to provide an early warning signal, allowing the system to initiate controlled shutdown procedures before the main monitored rails (V1/V2/ADJ) collapse and trigger RST.
LTC2911CTS8-1#TRPBF 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:
- 3.086V, 4.675V, 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
LTC2911CTS8-1#TRPBF FAQ
1.How can I place an order for LTC2911CTS8-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2911CTS8-1#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 LTC2911CTS8-1#TRPBF reliable?
The price and inventory of LTC2911CTS8-1#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2911CTS8-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2911CTS8-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2911CTS8-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2911CTS8-1#TRPBF?
LTC2911CTS8-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2911CTS8-1#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 LTC2911CTS8-1#TRPBF?
For technical support, including LTC2911CTS8-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2911CTS8-1#TRPBF requirements.
6.How does Aetrix verify that LTC2911CTS8-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2911CTS8-1#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 LTC2911CTS8-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2911CTS8-1#TRPBF?
All LTC2911CTS8-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2911CTS8-1#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 LTC2911CTS8-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC2911CTS8-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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