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Analog Devices Inc. LTC2911CTS8-5#TRPBF
- Part No.:
- LTC2911CTS8-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
LTC2911CTS8-5#TRPBF.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,346
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Product details
Overview
LTC2911CTS8-5#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 V1 (3.3V), V2 (adjustable), and ADJ (0.5V threshold) inputs with ±1.5% threshold accuracy over –40°C to 85°C, supports internal 200ms or external capacitor–programmable reset timeout, and delivers ultralow-voltage operation down to VCC = 0.5V - used in industrial embedded systems for reliable power sequencing and controlled shutdown.
For engineers reviewing the LTC2911CTS8-5#TRPBF datasheet, LTC2911CTS8-5#TRPBF pinout, LTC2911CTS8-5#TRPBF application, or LTC2911CTS8-5#TRPBF equivalent, key selection criteria include its adjustable dual-supply monitoring capability (V2 and ADJ both configurable), PFI-based early-warning power-fail signaling, TMR latch functionality for margin testing, and TSOT-23-8 package compatibility with space-constrained PCB layouts.
Technical Context
The LTC2911CTS8-5#TRPBF implements three independent voltage comparators: one fixed 3.3V monitor on V1, one high-impedance adjustable input on V2 (nominal 0.5V threshold), and one on ADJ (also 0.5V threshold). Its internal VCC is derived solely from V1 - unlike other variants that select between V1/V2 - enabling stable operation even when V2 is floating or configured via resistive divider.
It integrates a dedicated power-fail comparator with 500mV falling-edge threshold and 15mV hysteresis on PFI, driving open-drain PFO for early warning; RST is open-drain with weak internal pull-up to V1 and supports latching via TMR pin pulled to GND. Reset assertion requires all monitored inputs to remain below threshold for ≥8µs propagation delay before timeout initiation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| V1 Threshold | 3.086V (–6.5% of 3.3V), guaranteed ±1.5% over –40°C to 85°C - ensures precise undervoltage detection without external calibration |
| V2 / ADJ Threshold | 500mV nominal, ±7.5mV max deviation - enables accurate resistive-divider configuration for custom supply rails |
| Reset Timeout | Internally fixed 200ms (TMR = V1) or externally programmable (CTMR = 2.2nF → 20ms) - eliminates need for external RC timing components in most designs |
| Supply Current | 30µA typical at TA = 25°C - supports battery-backed or low-power always-on monitoring applications |
| PFO Propagation Delay | 8–80µs (over full temp range) - provides fast response to input voltage collapse for timely system shutdown |
| Minimum Operating Voltage | 0.5V guaranteed for RST/PFO output drive - prevents indeterminate logic states during brownout or power-up ramping |
| Input Hysteresis | 15mV on PFI, 100mV on TMR latch mode - rejects noise-induced false triggering in electrically noisy environments |
Pinout & Package
Package: 8-Lead TSOT-23 (TS8), 3mm × 1.75mm footprint, exposed pad optional, rated for –40°C to 85°C industrial operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PFI | Power-fail input | Monitors external supply via resistive divider; asserts PFO low when voltage falls below 500mV - enables early warning of primary rail collapse |
| ADJ | Adjustable monitor input | High-impedance 0.5V comparator input; accepts resistive-divider-configured trip point for third supply rail |
| TMR | Reset timeout/latch control | Configures reset timeout (capacitor-to-GND) or enables RST latching (pulled to GND); internal 200ms mode when tied to V1 |
| GND | Device ground reference | Common return path for all analog comparators and digital outputs; must be low-impedance for accurate threshold sensing |
| V2 | Adjustable supply monitor input | High-Z 0.5V threshold input (LTC2911-5 variant); functions identically to ADJ - supports dual adjustable rail monitoring |
| V1 | 3.3V supply monitor & power source | Fixed 3.3V (–6.5%) monitor input; supplies internal VCC and drives internal pull-ups on RST/PFO |
| PFO | Open-drain power-fail output | Asserts low on PFI threshold breach; weak internal pull-up to V1 - requires external pull-up for >V1 logic levels or faster rise times |
| RST | Open-drain reset output | Asserts low if any monitored input falls below threshold; latched state persists until TMR release - critical for margin testing |
Key Features
| Feature | Design Value |
|---|---|
| Triple independent voltage monitoring | Simultaneous supervision of 3.3V (V1), adjustable (V2), and adjustable (ADJ) rails - eliminates need for multiple discrete supervisors |
| ±1.5% threshold accuracy over temperature | Reduces required system voltage margin by >2% vs. ±3% parts - improves design headroom for tight-tolerance supplies |
| Programmable reset timeout | Internal 200ms default or external capacitor option (9.4ms/nF) - simplifies BOM and layout while supporting diverse timing requirements |
| Power-fail comparator with hysteresis | 500mV/515mV thresholds + 15mV hysteresis on PFI - prevents chatter during slow-falling supply transitions |
| Reset latch via TMR pin | Pulling TMR to GND freezes RST state indefinitely - enables safe voltage margining without unintended system resets |
Applications
| Industrial PLC Power Sequencing | Automotive Infotainment Supply Monitoring |
|---|---|
Use Scenario: Supervising 3.3V I/O rail, 5V MCU core supply, and 12V battery backup in programmable logic controller backplane. IC Role / Device Role / Timing Role: LTC2911CTS8-5#TRPBF monitors all three rails, asserts RST only after sustained undervoltage across all, and signals PFO to initiate graceful firmware save before main power loss. Use Value: Prevents corrupted configuration writes during brownout by ensuring RST holds until all supplies stabilize post-power-up and PFO triggers shutdown sequence before VDD drops below MCU operational minimum. | Use Scenario: Monitoring 3.3V display interface, 1.8V SoC I/O, and Li-ion battery stack voltage in automotive head unit. IC Role / Device Role / Timing Role: LTC2911CTS8-5#TRPBF uses V1 for 3.3V, V2 for 1.8V (via resistor divider), and ADJ for battery voltage scaling - PFO connects to SoC NMI for immediate interrupt on low-battery warning. Use Value: Enables deterministic shutdown within 30ms of PFI threshold breach, preserving audio buffer contents and saving user settings to EEPROM before power collapse. |
| Network Equipment Hot-Swap Control | Medical Diagnostic Imaging Power Integrity |
Use Scenario: Validating pre-charge, main DC/DC output, and auxiliary bias rails during hot-swap module insertion in 48V telecom gear. IC Role / Device Role / Timing Role: LTC2911CTS8-5#TRPBF configures V2 and ADJ as scaled monitors for 48V and 12V rails using precision dividers; TMR pin latched during insertion to suppress transient-induced resets. Use Value: Eliminates false resets during inrush current events by holding RST asserted until all rails settle, then releasing latch to enable clean system boot after hot-swap completion. | Use Scenario: Ensuring stable 3.3V FPGA configuration, 2.5V ADC reference, and 5V motor driver supplies in portable ultrasound scanner. IC Role / Device Role / Timing Role: LTC2911CTS8-5#TRPBF applies V1 to 3.3V, V2 to 2.5V (resistor-set), ADJ to 5V (resistor-set); PFO triggers emergency image save to flash when main battery dips below 10.8V. Use Value: Guarantees data integrity by initiating nonvolatile write sequence 200ms before RST assertion - meeting IEC 62304 Class C software safety requirements. |
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/5V/12V thresholds; no adjustable V2/ADJ inputs; 200ms fixed timeout only | Suitable for legacy designs with standard rail voltages but lacks flexibility for custom or low-voltage rails | Select when replacing older MAX63xx designs with identical pinout and no need for adjustable thresholds |
| TPS3808G33DBVR | Single 3.3V monitor only; requires two additional ICs to match triple-monitor function; 200ms/300ms selectable timeout | Higher BOM count and board area; no integrated PFI or latch functionality | Choose only if existing layout accommodates three separate supervisors and cost-per-channel is prioritized over integration |
Compared with MAX6369KA+T and TPS3808G33DBVR, the LTC2911CTS8-5#TRPBF uniquely supports dual adjustable inputs (V2 and ADJ) in a single TSOT-23-8 package with latched reset and PFI-driven early warning - reducing component count by 2–3x and enabling compact, flexible power integrity solutions for next-gen embedded systems.
Availability
LTC2911CTS8-5#TRPBF is available at Aetrix Electronics and suitable for industrial PLCs, automotive infotainment systems, telecom hot-swap modules, and medical imaging equipment requiring stable component supply, long-term lifecycle support, and guaranteed parametric performance across –40°C to 85°C.
Supply support for LTC2911CTS8-5#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 by Analog Devices (originally Linear Technology) to deliver precision, low-power, multi-rail supply monitoring with integrated power-fail warning and test-friendly latch features - targeting mission-critical embedded systems where reliability and design flexibility are paramount.
FAQ
What is the exact function of the V2 pin on the LTC2911CTS8-5#TRPBF?
The V2 pin on the LTC2911CTS8-5#TRPBF is a high-impedance adjustable voltage monitor input with a nominal 0.5V threshold, identical in function to the ADJ pin. Unlike earlier LTC2911 variants (e.g., -1 through -4), the -5 version repurposes V2 as a second configurable monitor - enabling simultaneous supervision of two custom rails via resistive dividers. This allows the LTC2911CTS8-5#TRPBF to monitor three rails: fixed 3.3V (V1), adjustable (V2), and adjustable (ADJ).
Does the LTC2911CTS8-5#TRPBF support internal reset timeout without external components?
Yes, the LTC2911CTS8-5#TRPBF supports an internally generated 200ms reset timeout period. This is enabled by connecting the TMR pin directly to V1. No external capacitor is required in this configuration, simplifying design and reducing BOM count. The internal timeout is specified from 140ms to 280ms over temperature, with typical value at 200ms - making it suitable for general-purpose power-on reset timing without precision timing requirements.
How does the PFI input on the LTC2911CTS8-5#TRPBF differ from the ADJ input?
The PFI input on the LTC2911CTS8-5#TRPBF has a dedicated 500mV falling-edge threshold with 15mV hysteresis and is optimized for early-warning power-fail detection, whereas the ADJ input has a 0.5V threshold with no hysteresis and is intended for general-purpose supply monitoring. PFI drives the PFO output independently, allowing asynchronous warning before RST assertion. Both accept resistive dividers, but PFI's hysteresis and propagation delay (8–80µs) are tuned for rapid response to primary supply collapse - a key distinction in system-level fault handling.
Can the LTC2911CTS8-5#TRPBF operate with VCC below 1V?
Yes, the LTC2911CTS8-5#TRPBF guarantees functional RST and PFO output drive down to VCC = 0.5V, as confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables. Its proprietary low-voltage output circuitry maintains valid logic-low states even during deep brownout conditions. This capability ensures deterministic reset behavior during uncontrolled power-down sequences - a critical requirement for data retention and safe shutdown in battery-powered or energy-harvesting systems using the LTC2911CTS8-5#TRPBF.
What is the purpose of the TMR pin latch feature on the LTC2911CTS8-5#TRPBF?
The TMR pin latch feature on the LTC2911CTS8-5#TRPBF allows the RST output state to be frozen indefinitely by pulling TMR to GND. This prevents spurious resets during voltage margin testing, where supply rails are intentionally lowered to verify system robustness. Once latched, RST remains in its current state (high or low) regardless of input voltage changes until TMR is released. This enables repeatable, controlled validation of reset timing margins without requiring external logic or microcontroller intervention - a key advantage for production test and qualification of systems using the LTC2911CTS8-5#TRPBF.
LTC2911CTS8-5#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, Adj, 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
LTC2911CTS8-5#TRPBF FAQ
1.How can I place an order for LTC2911CTS8-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2911CTS8-5#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 LTC2911CTS8-5#TRPBF reliable?
The price and inventory of LTC2911CTS8-5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2911CTS8-5#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2911CTS8-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2911CTS8-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2911CTS8-5#TRPBF?
LTC2911CTS8-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2911CTS8-5#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 LTC2911CTS8-5#TRPBF?
For technical support, including LTC2911CTS8-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2911CTS8-5#TRPBF requirements.
6.How does Aetrix verify that LTC2911CTS8-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2911CTS8-5#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 LTC2911CTS8-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2911CTS8-5#TRPBF?
All LTC2911CTS8-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2911CTS8-5#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 LTC2911CTS8-5#TRPBF part is unused and in its original packaging.
Return procedure for LTC2911CTS8-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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