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Analog Devices Inc. LTC2911HTS8-2#TRPBF
- Part No.:
- LTC2911HTS8-2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
LTC2911HTS8-2#TRPBF.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL TSOT23-8
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LTC2911HTS8-2#TRPBF from Analog Devices (acquired Linear Technology) is a high-accuracy triple supply monitor IC with integrated power-fail comparator and latchable reset output. It monitors 3.3V (V1), 2.5V (V2), and an adjustable input (ADJ) with ±1.5% threshold accuracy over –40°C to +125°C, supports internal 200ms reset timeout, and delivers ultralow 30µA quiescent current - deployed in automotive engine control units for reliable brownout detection and controlled shutdown.
For engineers reviewing the LTC2911HTS8-2#TRPBF datasheet, LTC2911HTS8-2#TRPBF pinout, LTC2911HTS8-2#TRPBF application, or LTC2911HTS8-2#TRPBF equivalent, key selection criteria include its H-grade automotive temperature range (–40°C to +125°C), TSOT-23-8 package, precise 2.338V V2 reset threshold for 2.5V supplies, PFI-based early-warning power-fail signaling, and TMR-latch capability for margin testing under voltage stress.
Technical Context
The LTC2911HTS8-2#TRPBF implements three independent voltage comparators: V1 fixed at 3.086V (3.3V –6.5%), V2 fixed at 2.338V (2.5V –6.5%), and ADJ with 500mV nominal threshold. All comparators feature 1.5% accuracy across temperature and built-in glitch filtering to suppress noise-induced false resets.
Its power-fail function 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 latching of RST state or selection between internal 200ms timeout and external capacitor-programmed delay.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| V1 Threshold | 3.086V ±1.5% - guarantees reliable 3.3V supply monitoring down to 3.036V over full automotive temperature range |
| V2 Threshold | 2.338V ±1.5% - precisely tracks 2.5V rail with –6.5% trip point, eliminating need for external resistor divider |
| ADJ Threshold | 500mV ±1.5% - enables configurable third supply monitoring via resistive divider (e.g., 1.2V, 1.8V, or custom) |
| PFI Threshold | 500mV falling / 515mV rising - provides noise-immune early warning of primary supply collapse with 3% hysteresis |
| Reset Timeout | 200ms internal (TMR = V1) or 15–27ms external (CTMR = 2.2nF) - ensures sufficient hold time for processor initialization or state save |
| Quiescent Current | 30µA typical - minimizes loading on monitored supplies, critical for battery-backed or low-power systems |
| Operating Temp | –40°C to +125°C - qualified for under-hood automotive applications per AEC-Q100 stress requirements |
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 system supply via resistive divider; asserts PFO low when voltage falls below 500mV |
| ADJ | Adjustable monitor input | High-impedance 500mV comparator input for third supply; threshold set by external resistor network |
| TMR | Reset timeout/latch control | Configures reset delay (capacitor to GND) or enables RST latching (pull to GND); internal 200ms if tied to V1 |
| GND | Ground reference | Common return path for all comparators, outputs, and internal circuitry; connects to exposed pad in DFN variant |
| V2 | 2.5V supply monitor | Dedicated input for 2.5V rail with factory-trimmed 2.338V threshold; bypass capacitor required |
| V1 | 3.3V supply monitor & VCC source | Primary 3.3V monitor (3.086V threshold); powers internal circuitry and provides weak pull-up for RST/PFO |
| PFO | Power-fail open-drain output | Asserts low on PFI undervoltage; provides early warning signal (e.g., NMI to MCU) before main reset triggers |
| RST | Reset open-drain output | Asserts low when any monitored supply (V1/V2/ADJ) falls below threshold; latched low during TMR = GND |
Key Features
| Feature | Design Value |
|---|---|
| ±1.5% threshold accuracy over temperature | Reduces system voltage margin requirement vs. ±2.5% or ±3% competitors, enabling tighter supply tolerances and lower BOM cost |
| Ultralow 30µA supply current | Minimizes impact on monitored rails - essential for always-on automotive modules and battery-powered diagnostics |
| Integrated PFI/PFO power-fail channel | Eliminates need for separate supervisor or comparator IC, reducing board area and design complexity |
| TMR pin latch mode | Enables deterministic margin testing without triggering actual system reset - simplifies validation of voltage tolerance limits |
| Glitch-immune comparators | Prevents spurious resets from transient noise on V1/V2/ADJ inputs, improving field reliability in EMI-heavy environments |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC I/O Module |
|---|---|
Use Scenario: Monitors 3.3V microcontroller core supply, 2.5V sensor interface rail, and 12V battery voltage (via ADJ divider) in diesel ECU under hood. IC Role / Device Role / Timing Role: Triple-supply supervisor with latchable RST and PFO-driven NMI for graceful firmware shutdown prior to brownout. Use Value: Prevents flash corruption and EEPROM write errors during battery sag by initiating controlled reset sequence 200ms before VDD collapse. | Use Scenario: Ensures reliable operation of isolated analog input channels powered by local DC/DC converters in modular PLC backplane. IC Role / Device Role / Timing Role: Simultaneous monitoring of 3.3V logic, 2.5V ADC reference, and adjustable 5V analog supply with programmable reset timeout. Use Value: Guarantees clean power-up sequencing and prevents lockup during hot-swap events by holding RST until all rails stabilize for ≥200ms. |
| Medical Infusion Pump Controller | Telecom Remote Radio Unit (RRU) |
Use Scenario: Supervises 3.3V MCU, 2.5V DAC supply, and backup Li-ion cell voltage (via ADJ) in battery-operated infusion pump with safety-critical firmware. IC Role / Device Role / Timing Role: High-accuracy triple monitor with PFI-linked PFO output to trigger emergency dose stop and data save before power loss. Use Value: Meets IEC 62304 Class C software safety requirements by providing deterministic, temperature-stable reset thresholds across full operating range. | Use Scenario: Monitors 3.3V FPGA configuration rail, 2.5V transceiver supply, and –48V DC input (via ADJ divider) in outdoor RRU enclosure. IC Role / Device Role / Timing Role: Automotive-grade (H-temp) supervisor ensuring robust operation in wide ambient temperature swings and high EMI environments. Use Value: Enables extended field life without derating - eliminates thermal drift-induced false resets common with commercial-grade supervisors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6369AUT+T | Fixed 3.08V/2.63V thresholds; no PFI/PFO; only two monitored supplies; 100µA IQ | Lacks power-fail warning and third adjustable input; unsuitable for early-shutdown or multi-rail margining | Select only if PFI functionality and ADJ flexibility are unnecessary and higher quiescent current is acceptable |
| TPS3808G33DBVR | Single 3.3V monitor; no V2/ADJ/PFI; 1.6µA IQ; 200ms fixed timeout | Cannot monitor 2.5V rail or provide power-fail signaling; requires additional ICs for full triple-supply coverage | Use only as partial replacement where only V1 supervision is needed and ultra-low IQ dominates design priority |
Compared with MAX6369AUT+T and TPS3808G33DBVR, the LTC2911HTS8-2#TRPBF uniquely integrates three precision monitors, a dedicated PFI/PFO channel, and latchable reset in a single TSOT-23-8 package - delivering functional completeness and automotive-grade reliability unattainable with either alternative alone.
Availability
LTC2911HTS8-2#TRPBF is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC I/O modules, medical infusion pump controllers, and telecom remote radio units requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC2911HTS8-2#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 technologies, serving industrial, automotive, communications, and healthcare markets.
The LTC2911 family was designed by Linear Technology (now ADI) specifically for high-reliability power monitoring in harsh environments - emphasizing precision threshold accuracy, low power, and robust noise immunity for automotive and industrial applications.
FAQ
What is the exact reset threshold voltage for the V2 input of LTC2911HTS8-2#TRPBF?
The V2 input of LTC2911HTS8-2#TRPBF has a guaranteed reset threshold of 2.338V ±1.5% over –40°C to +125°C, corresponding to a –6.5% trip point for a nominal 2.5V supply. This value is factory-trimmed and does not require external resistor calibration, unlike general-purpose adjustable supervisors.
Does LTC2911HTS8-2#TRPBF support latching the RST output during voltage margin testing?
Yes, LTC2911HTS8-2#TRPBF supports RST latching: pulling the TMR pin to GND forces RST into a static low or high state regardless of input conditions. This allows safe margin testing of V1/V2/ADJ rails without triggering unintended system resets - a key feature for automotive qualification testing.
What is the minimum operating voltage that guarantees proper PFO output functionality in LTC2911HTS8-2#TRPBF?
LTC2911HTS8-2#TRPBF guarantees PFO high-state operation down to VCC = 2.3V, where VCC is derived from the greater of V1 or V2. Below 2.3V, PFO may not reliably assert high, though RST and PFO retain low-state drive capability down to 0.5V - critical for fail-safe behavior during deep brownout.
Can LTC2911HTS8-2#TRPBF monitor a 12V battery supply using the ADJ input?
Yes, LTC2911HTS8-2#TRPBF can monitor a 12V battery supply via the ADJ input using a resistive divider. With ADJ's 500mV threshold, a 24:1 divider (e.g., 11.5MΩ + 500kΩ) sets a 12V trip point. Input bias current (<40nA at H-grade) ensures minimal error, and optional RC filtering improves noise immunity in automotive environments.
How does the PFI hysteresis work in LTC2911HTS8-2#TRPBF, and why is it important?
LTC2911HTS8-2#TRPBF implements 3% hysteresis on the PFI input: 500mV falling threshold and 515mV rising threshold. This prevents oscillation during slow or noisy supply decay/recovery, ensuring clean PFO assertion/deassertion. In automotive applications, this eliminates false power-fail warnings caused by load-dump transients or alternator ripple.
LTC2911HTS8-2#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:
- 2.338V, 3.086V, Adj
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- Adjustable/Selectable
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-8
LTC2911HTS8-2#TRPBF FAQ
1.How can I place an order for LTC2911HTS8-2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2911HTS8-2#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 LTC2911HTS8-2#TRPBF reliable?
The price and inventory of LTC2911HTS8-2#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2911HTS8-2#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2911HTS8-2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2911HTS8-2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2911HTS8-2#TRPBF?
LTC2911HTS8-2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2911HTS8-2#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 LTC2911HTS8-2#TRPBF?
For technical support, including LTC2911HTS8-2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2911HTS8-2#TRPBF requirements.
6.How does Aetrix verify that LTC2911HTS8-2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2911HTS8-2#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 LTC2911HTS8-2#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2911HTS8-2#TRPBF?
All LTC2911HTS8-2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2911HTS8-2#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 LTC2911HTS8-2#TRPBF part is unused and in its original packaging.
Return procedure for LTC2911HTS8-2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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