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Analog Devices Inc. LTC2911ITS8-3
- Part No.:
- LTC2911ITS8-3
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
LTC2911ITS8-3.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:4,047
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Product details
Overview
LTC2911ITS8-3 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), 1.8V (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. It is used in notebook computers and industrial embedded systems for reliable power sequencing and early brownout warning.
For engineers reviewing the LTC2911ITS8-3 datasheet, LTC2911ITS8-3 pinout, LTC2911ITS8-3 application, or LTC2911ITS8-3 equivalent, key selection criteria include its fixed 3.3V/1.8V dual-supply monitoring configuration, PFI-based power-fail detection with 500mV threshold, TMR-controlled latch mode for margin testing, and TSOT-23-8 package compatibility with space-constrained PCB layouts.
Technical Context
The LTC2911ITS8-3 implements three independent voltage comparators: V1 (3.3V nominal, –6.5% trip = 3.086V), V2 (1.8V nominal, –6.5% trip = 1.683V), and ADJ (0.5V nominal threshold). All comparators feature 1.5% accuracy across temperature and built-in glitch filtering for noise immunity.
Its power-fail function uses a dedicated PFI input with 500mV falling-edge threshold and 15mV hysteresis, driving the open-drain PFO output. The TMR pin enables three operating modes: external capacitor timeout, internal 200ms timeout (TMR = V1), or latch mode (TMR = GND) to hold RST state during voltage margining.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| V1 Threshold | 3.086V (–6.5% of 3.3V); guaranteed 3.036V–3.135V over full temp range |
| V2 Threshold | 1.683V (–6.5% of 1.8V); applies only to LTC2911-3 variant confirmed for this part number |
| ADJ Threshold | 500mV ±7.5mV; enables resistive divider configuration for third supply monitoring |
| PFI Threshold | 500mV falling edge, 515mV rising edge; provides 3% hysteresis for robust power-fail detection |
| Reset Timeout | Internally fixed at 200ms (TMR tied to V1); eliminates need for external timing capacitor |
| Supply Current | 30µA typical; drawn from higher of V1 or V2, enabling operation during asymmetric power-up |
| Operating Temp | –40°C to +85°C (I-grade); qualified for industrial environments with no derating |
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; asserts PFO low when voltage falls below 500mV |
| ADJ | Adjustable monitor input | 0.5V threshold comparator; used with resistor divider to set third supply trip point |
| TMR | Reset timeout/latch control | Tied to V1 → 200ms internal timeout; pulled to GND → latches RST state for margin testing |
| GND | Device ground reference | Common return for all analog and digital functions; exposed pad may be connected to GND for thermal relief |
| V2 | 1.8V supply monitor input | Fixed –6.5% undervoltage detector (1.683V trip); also contributes to internal VCC generation |
| V1 | 3.3V supply monitor input | Fixed –6.5% undervoltage detector (3.086V trip); primary VCC source and RST/PFO pull-up reference |
| PFO | Open-drain power-fail output | Asserts low on PFI under-voltage; weak internal pull-up to V1 (29µA typ); supports external pull-up to higher voltage |
| RST | Open-drain reset output | Asserts low if V1, V2, or ADJ falls below threshold; same pull-up structure as PFO; latchable via TMR |
Key Features
| Feature | Design Value |
|---|---|
| Triple simultaneous monitoring | Independent 3.3V, 1.8V, and adjustable thresholds enable single-chip supervision of multi-rail systems |
| ±1.5% threshold accuracy | Reduces required system voltage margin by >1.5% vs. ±2.5% parts, improving reliability near supply limits |
| Power-fail comparator with hysteresis | 500mV/515mV thresholds provide noise-immune early warning before main supply collapse |
| Configurable reset timeout | Internal 200ms option eliminates timing capacitor, saving BOM cost and board area |
| Latch mode for margin testing | TMR pin pull-down holds RST state, enabling controlled voltage stress testing without spurious resets |
Applications
| Server Power Sequencing | Notebook System Supervision |
|---|---|
Use Scenario: Coordinating startup/shutdown of CPU, memory, and I/O rails in 1U rack servers. IC Role / Device Role / Timing Role: Triple monitor ensures all critical supplies (3.3V, 1.8V, and core logic rail) are stable before releasing RST; PFO triggers graceful shutdown when AC input sags. Use Value: Prevents data corruption during brownouts by initiating controlled power-down 200ms before VCC drops below 0.5V. | Use Scenario: Managing power states in ultrabook platforms with multiple DC/DC converters. IC Role / Device Role / Timing Role: V1 monitors main 3.3V rail, V2 tracks 1.8V SoC I/O supply, ADJ supervises adjustable 0.85V GPU core voltage via resistor divider. Use Value: Single-chip solution reduces component count vs. discrete supervisors while maintaining ±1.5% trip accuracy across –40°C to 85°C. |
| Industrial PLC Controller | Automotive Infotainment Module |
Use Scenario: Ensuring deterministic boot in programmable logic controllers exposed to wide ambient temperature swings. IC Role / Device Role / Timing Role: Monitors 3.3V FPGA configuration rail, 1.8V transceiver supply, and 5V analog sensor bus (via ADJ divider); TMR latch enables field calibration at reduced voltage. Use Value: Guaranteed operation down to 0.5V VCC prevents metastability during cold-cranking events. | Use Scenario: Supervising head unit power domains including display backlight, audio codec, and CAN interface supplies. IC Role / Device Role / Timing Role: V1 watches 3.3V microcontroller rail, V2 tracks 1.8V DDR interface, PFI monitors 12V battery via 24:1 divider for ignition-off detection. Use Value: PFO assertion at 10.8V battery voltage initiates safe shutdown before EEPROM write failure occurs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6316US33D3+T | Single 3.3V reset only; no V2/ADJ monitoring or PFI functionality; SOT23-5 package | Suitable only for basic 3.3V-only systems; cannot replace triple-monitoring requirement | Select only if design requires minimal footprint and monitors only one rail |
| TPS3808G33DBVR | Single 3.3V supervisor with adjustable delay; no secondary voltage inputs or PFI; 5-pin SOT23 | Lacks V2/ADJ comparators and power-fail warning; requires external circuitry for multi-rail monitoring | Choose when cost sensitivity outweighs need for integrated triple monitoring |
Compared with MAX6316US33D3+T and TPS3808G33DBVR, the LTC2911ITS8-3 provides integrated triple-supply monitoring, PFI-based early warning, and latch-mode margin testing in a single TSOT-23-8 package-eliminating design complexity and board area otherwise needed for discrete solutions.
Availability
LTC2911ITS8-3 is available at Aetrix Electronics and suitable for industrial PLC controllers, notebook computers, network servers, and automotive infotainment modules requiring stable component supply across extended temperature ranges.
Supply support for LTC2911ITS8-3 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, formed through the acquisition of Linear Technology in 2017.
The LTC2911 family was designed specifically for high-accuracy, low-power supply monitoring in space-constrained industrial and computing systems where ±1.5% threshold stability and multi-rail coordination are critical.
FAQ
What is the exact V2 supply threshold configured for LTC2911ITS8-3?
The LTC2911ITS8-3 is the LTC2911-3 variant, with a fixed V2 threshold of 1.683V (–6.5% of 1.8V). This value is guaranteed from 3.036V to 3.135V for V1 and 1.656V to 1.710V for V2 over the full –40°C to +85°C operating range, per the Electrical Characteristics table in the official datasheet.
Can LTC2911ITS8-3 monitor a 5V supply on the V2 pin?
No. The LTC2911ITS8-3 is specifically the LTC2911-3 variant, which configures V2 for 1.8V monitoring only. To monitor 5V on V2, the correct part is LTC2911ITS8-1. Using LTC2911ITS8-3 for 5V will result in premature reset assertion since its V2 comparator trips at 1.683V.
How does the TMR pin function in LTC2911ITS8-3 for reset timeout control?
In LTC2911ITS8-3, tying the TMR pin to V1 enables the internal 200ms reset timeout, eliminating the need for an external capacitor. Pulling TMR to GND latches the RST output state for margin testing. Leaving TMR floating results in ~400µs timeout, but this mode is not recommended for production use due to parasitic capacitance sensitivity.
What is the minimum operating voltage that guarantees proper RST and PFO operation in LTC2911ITS8-3?
The LTC2911ITS8-3 guarantees RST and PFO output functionality down to VCC = 0.5V, as specified in the Absolute Maximum Ratings and confirmed in the Electrical Characteristics table (VCC,OP = 2.3V min for PFO high, but outputs remain functional to 0.5V). This enables reliable reset assertion during deep brownout conditions before system logic fails.
Does LTC2911ITS8-3 require external pull-up resistors on RST and PFO pins?
The LTC2911ITS8-3 provides internal weak pull-ups to V1 (29µA typical), sufficient for most microcontroller reset inputs. However, external pull-ups are required if VOH > V1 is needed, or to achieve faster rise times in high-capacitance bus environments. The datasheet explicitly recommends external pull-ups for VOH voltages exceeding V1.
LTC2911ITS8-3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-8 Thin, TSOT-23-8
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-8
LTC2911ITS8-3 FAQ
1.How can I place an order for LTC2911ITS8-3 through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2911ITS8-3 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 LTC2911ITS8-3 reliable?
The price and inventory of LTC2911ITS8-3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2911ITS8-3 is usually 5 days.
3.What payment methods are accepted for LTC2911ITS8-3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2911ITS8-3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2911ITS8-3?
LTC2911ITS8-3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2911ITS8-3 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 LTC2911ITS8-3?
For technical support, including LTC2911ITS8-3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2911ITS8-3 requirements.
6.How does Aetrix verify that LTC2911ITS8-3 is sourced from the original manufacturer or authorized distributors?
All LTC2911ITS8-3 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 LTC2911ITS8-3 meets industry standards.
7.What is the process for return or replacement of LTC2911ITS8-3?
All LTC2911ITS8-3 units undergo pre-shipment inspection (PSI). If there is an issue with LTC2911ITS8-3, 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 LTC2911ITS8-3 part is unused and in its original packaging.
Return procedure for LTC2911ITS8-3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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