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Analog Devices Inc. LTC2911ITS8-3#TRPBF
- Part No.:
- LTC2911ITS8-3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
LTC2911ITS8-3#TRPBF.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,094
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Product details
Overview
LTC2911ITS8-3#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), 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 for reliable power-up sequencing in embedded computing systems.
For engineers reviewing the LTC2911ITS8-3#TRPBF datasheet, LTC2911ITS8-3#TRPBF pinout, LTC2911ITS8-3#TRPBF application, or LTC2911ITS8-3#TRPBF equivalent, this page delivers verified functional identity, TSOT-23-8 package mapping, confirmed 3.3V/1.8V/ADJ monitoring roles, PFI/PFO power-fail signaling behavior, and two validated alternative part numbers with documented technical and application differences.
Technical Context
The LTC2911ITS8-3#TRPBF implements three independent voltage comparators - one fixed at 3.3V (V1), one fixed at 1.8V (V2), and one adjustable via external resistor divider on ADJ with 500mV nominal threshold. All comparators feature 1.5% accuracy across temperature and built-in glitch filtering for noise immunity.
It integrates a dedicated power-fail comparator (PFI → PFO) with 500mV falling-edge threshold and 15mV hysteresis, plus TMR-controlled latch mode for margin testing. Reset timeout is selectable between internal 200ms or external capacitor (e.g., 2.2nF = 20ms), and RST/PFO outputs are weakly pulled up to V1 (29µA typical).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| V1 Threshold | 3.086V ±1.5% - precisely monitors 3.3V supply at –6.5% undervoltage trip point |
| V2 Threshold | 1.683V ±1.5% - configured for 1.8V supply monitoring per LTC2911-3 variant |
| ADJ Threshold | 500mV ±1.5% - enables resistive divider-based monitoring of any supply ≥0.55V |
| PFI Threshold | 500mV falling / 515mV rising - provides early warning of primary supply collapse with 3% hysteresis |
| Reset Timeout | 200ms internal or 15–27ms external (CTMR = 2.2nF) - ensures stable system boot before release |
| Supply Current | 30µA typical - ultra-low quiescent draw enables use in battery-backed or always-on subsystems |
| Operating Temp | –40°C to +85°C - qualified for industrial-grade reliability without 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 |
|---|---|---|
| 1 - PFI | Power-fail input | Monitors primary supply via resistive divider; triggers PFO low at 500mV falling edge |
| 2 - ADJ | Adjustable monitor input | High-impedance 500mV comparator input; sets third trip point using external resistor network |
| 3 - TMR | Reset timeout/latch control | Tie to V1 for 200ms internal timeout; pull to GND to latch RST state during margin testing |
| 4 - GND | Device ground reference | Common return for all analog and digital functions; exposed pad may be connected |
| 5 - RST | Reset logic output | Open-drain output pulled up to V1; asserts low if any monitored supply falls below threshold |
| 6 - PFO | Power-fail logic output | Open-drain output pulled up to V1; signals early warning of main supply failure |
| 7 - V1 | 3.3V supply monitor & power source | Primary 3.3V undervoltage detector; supplies internal VCC and RST/PFO pull-up current |
| 8 - V2 | 1.8V supply monitor input | Dedicated 1.8V comparator input (LTC2911-3 variant); bypass to GND with ≥0.1µF capacitor |
Key Features
| Feature | Design Value |
|---|---|
| Triple simultaneous monitoring | Simultaneously supervises 3.3V (V1), 1.8V (V2), and user-configurable supply (ADJ) with independent comparators |
| ±1.5% threshold accuracy | Guaranteed over full –40°C to +85°C range - eliminates need for design margin beyond supply tolerance |
| Configurable power-fail warning | PFI input with 500mV threshold and 15mV hysteresis enables precise early-warning shutdown before critical brownout |
| Latched reset for margin testing | TMR pin allows RST state to be held indefinitely - simplifies voltage stress testing without spurious resets |
| Ultralow VCC operation | RST and PFO remain functional down to 0.5V VCC - prevents indeterminate logic states during power ramp-up |
Applications
| Industrial PLC Power Sequencing | Network Server Board Management |
|---|---|
|
Use Scenario: Monitoring redundant 3.3V, 1.8V, and auxiliary 5V rails during cold start and hot-swap events in programmable logic controllers. IC Role / Device Role / Timing Role: Triple-supply supervisor ensuring all rails stabilize above thresholds before enabling FPGA configuration and I/O drivers. Use Value: Prevents partial initialization by enforcing 200ms minimum hold time after all voltages exceed thresholds - eliminates firmware lockup due to marginal rail timing. |
Use Scenario: Coordinating power sequencing across CPU core, memory, and PCIe interface rails in dual-socket server motherboards. IC Role / Device Role / Timing Role: Centralized reset arbiter that gates processor reset until 3.3V, 1.8V, and adjustable VDDQ rails meet spec. Use Value: Enables deterministic boot by combining V1/V2/ADJ monitoring with PFI-driven PFO alert to initiate graceful shutdown before main 12V rail collapse. |
| Automotive Infotainment Head Unit | Medical Diagnostic Imaging Subsystem |
|
Use Scenario: Supervising 3.3V microcontroller supply, 1.8V display controller rail, and adjustable sensor bias voltage in automotive infotainment modules. IC Role / Device Role / Timing Role: Safety-critical voltage monitor with latched reset (TMR) for ECU-level fault injection testing under ISO 26262 ASIL-B conditions. Use Value: ±1.5% threshold accuracy reduces required voltage margin by 1.5% vs. ±2.5% alternatives - directly improves system robustness against battery sag. |
Use Scenario: Ensuring clean power-up of FPGA-based image processing pipeline in portable ultrasound devices powered by Li-ion battery packs. IC Role / Device Role / Timing Role: Dual-role supervisor: ADJ monitors battery voltage via divider; PFI tracks DC/DC converter input to warn of impending shutdown. Use Value: PFO early-warning signal triggers nonvolatile memory save before RST assertion - preserves diagnostic session data during brownout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6369KA+T | Fixed 3.3V/2.5V/1.8V thresholds; no ADJ input; 200ms fixed timeout only; 1.2µA quiescent current | Lacks adjustable third monitor and PFI/PFO power-fail signaling - suitable only for static-rail systems without early-warning needs | Select when lowest possible current draw is critical and all three rails are fixed; not drop-in due to missing ADJ/PFI functionality |
| TPS3808G33DBVR | Single 3.3V monitor; requires external circuitry for multi-rail supervision; 350ms min timeout; 16µA quiescent current | No native triple-monitor capability or power-fail comparator - demands additional comparators, dividers, and logic for equivalent function | Choose only for cost-sensitive designs where board space permits discrete implementation of missing features |
Compared with MAX6369KA+T and TPS3808G33DBVR, the LTC2911ITS8-3#TRPBF uniquely integrates triple-rail monitoring, adjustable threshold, and dedicated power-fail warning in a single TSOT-23-8 package - reducing BOM count, layout complexity, and validation effort for industrial and medical systems requiring coordinated power integrity.
Availability
LTC2911ITS8-3#TRPBF is available at Aetrix Electronics and suitable for industrial PLC power sequencing, network server board management, automotive infotainment head units, and medical diagnostic imaging subsystems requiring stable component supply and long-term lifecycle support.
Supply support for LTC2911ITS8-3#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 (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 supervision in space-constrained embedded systems - emphasizing ±1.5% threshold stability, ultralow-VCC operation, and integrated power-fail warning without external components.
FAQ
What is the exact voltage monitoring configuration for LTC2911ITS8-3#TRPBF?
The LTC2911ITS8-3#TRPBF is the LTC2911-3 variant, configured to monitor 3.3V on V1, 1.8V on V2, and an adjustable supply on ADJ with 500mV nominal threshold. Its V2 threshold is 1.683V ±1.5% (1.8V – 6.5%), and it uses the TSOT-23-8 package with industrial temperature range (–40°C to +85°C). This configuration is explicitly defined in the LTC2911 product selection guide and electrical characteristics table.
Does LTC2911ITS8-3#TRPBF support internal reset timeout, and how is it enabled?
Yes, LTC2911ITS8-3#TRPBF supports an internal 200ms reset timeout period. It is enabled by connecting the TMR pin directly to V1. When VTMR reaches V1, the device enters internal timer mode with guaranteed 140–280ms timeout range over temperature. This eliminates the need for an external capacitor and saves board space while maintaining precise timing control - confirmed in the Electrical Characteristics table (tRST(INT)) and Pin Functions description.
How does the power-fail comparator (PFI/PFO) function in LTC2911ITS8-3#TRPBF?
In LTC2911ITS8-3#TRPBF, the PFI pin accepts a divided-down version of the primary supply and compares it to a 500mV falling-edge threshold. When PFI drops below 500mV, PFO pulls low to signal imminent power failure - providing early warning before V1/V2/ADJ trip. The 15mV hysteresis (500mV/515mV) prevents chatter during noisy transitions. This behavior is identical across all LTC2911 variants and is fully characterized in the Electrical Characteristics table (VPFT, ∆VPFT).
Can LTC2911ITS8-3#TRPBF monitor a supply higher than 5V using the ADJ input?
Yes, LTC2911ITS8-3#TRPBF can monitor supplies >5V using the ADJ input, provided the external resistive divider scales the voltage to ≤0.55V at ADJ. The ADJ pin's absolute maximum rating is 6.5V, and its input current is ±15nA (C/I grade), enabling high-impedance divider designs. For example, a 12V supply can be monitored with R1 = 100kΩ and R2 = 1.3MΩ to yield 500mV at ADJ - as validated in the Applications Information section (Figure 2) and Absolute Maximum Ratings.
What is the minimum operating voltage guarantee for RST and PFO outputs in LTC2911ITS8-3#TRPBF?
LTC2911ITS8-3#TRPBF guarantees RST and PFO output functionality down to VCC = 0.5V, meaning both pins can actively drive low even when the internal supply (derived from greater of V1/V2) drops to 0.5V. This is specified in the Absolute Maximum Ratings and confirmed in the Electrical Characteristics table (VCC,OP = 2.3V min for PFO high, but low-state operation is guaranteed to 0.5V). This ensures deterministic reset behavior during slow power ramps.
LTC2911ITS8-3#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:
- 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#TRPBF FAQ
1.How can I place an order for LTC2911ITS8-3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2911ITS8-3#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 LTC2911ITS8-3#TRPBF reliable?
The price and inventory of LTC2911ITS8-3#TRPBF 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#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2911ITS8-3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2911ITS8-3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2911ITS8-3#TRPBF?
LTC2911ITS8-3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2911ITS8-3#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 LTC2911ITS8-3#TRPBF?
For technical support, including LTC2911ITS8-3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2911ITS8-3#TRPBF requirements.
6.How does Aetrix verify that LTC2911ITS8-3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2911ITS8-3#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 LTC2911ITS8-3#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2911ITS8-3#TRPBF?
All LTC2911ITS8-3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2911ITS8-3#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 LTC2911ITS8-3#TRPBF part is unused and in its original packaging.
Return procedure for LTC2911ITS8-3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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