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Analog Devices Inc. LTC2911CTS8-4#TRMPBF
- Part No.:
- LTC2911CTS8-4#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
LTC2911CTS8-4#TRMPBF.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:322
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Product details
Overview
LTC2911CTS8-4#TRMPBF 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), 1.2V (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 LTC2911CTS8-4#TRMPBF datasheet, LTC2911CTS8-4#TRMPBF pinout, LTC2911CTS8-4#TRMPBF application, or LTC2911CTS8-4#TRMPBF equivalent, this page delivers verified functional identity, TSOT-23-8 package mapping, confirmed 8-pin terminal roles, real-world margin testing use cases, and two validated alternative parts with documented technical and application-level differences.
Technical Context
The LTC2911CTS8-4#TRMPBF implements three independent voltage comparators - one fixed at 3.086V (V1), one preset to 1.122V (V2) for 1.2V supplies, and one adjustable via external resistor divider (ADJ, 500mV nominal threshold). All comparators feature 1.5% total threshold accuracy across temperature and include glitch filtering for noise immunity.
Its power-fail comparator (PFI/PFO) uses a 500mV falling-edge threshold with 15mV hysteresis, enabling early warning of supply collapse before monitored rails drop out. The TMR pin supports three modes: external capacitor timing, internal 200ms timeout (TMR = V1), or latch mode (TMR = GND) for margin testing without system reset.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| V1 Threshold | 3.086V ±1.5% - precisely monitors 3.3V rail with –6.5% trip point, preventing false resets within 5% supply tolerance band |
| V2 Threshold | 1.122V ±1.5% - factory-configured for 1.2V supply monitoring (LTC2911-4 variant), eliminating need for external divider on V2 |
| ADJ Threshold | 500mV ±1.5% - high-impedance input enabling resistive divider configuration of third supply threshold (e.g., 1.8V, 2.5V) |
| PFI Threshold | 500mV falling / 515mV rising - provides 3% hysteresis for robust early-warning detection of primary supply collapse |
| Reset Timeout | 200ms internal (TMR = V1) or 15–27ms external (CTMR = 2.2nF) - ensures sufficient hold time for processor initialization before release |
| Supply Current | 30µA typical - ultra-low quiescent draw enables use in battery-backed or always-on monitoring circuits |
| Min Operating VCC | 0.5V guaranteed - maintains valid RST/PFO logic states during brown-out, preventing indeterminate microcontroller behavior |
Pinout & Package
Package: 8-Lead Plastic TSOT-23 (TS8), 3mm × 1.75mm footprint, exposed pad optional, θJA = 195°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PFI | Power-fail input | Accepts resistive divider output; asserts PFO low when voltage falls below 500mV - used for early warning of main supply failure |
| ADJ | Adjustable monitor input | High-Z 500mV comparator input; enables third supply threshold configuration (e.g., 1.8V, 2.5V) via external divider |
| TMR | Reset timeout/latch control | Configures reset delay (capacitor to GND), enables internal 200ms timer (tie to V1), or latches RST state (tie to GND) for margin testing |
| GND | Device ground reference | Common return path for all comparators and outputs; exposed pad (if present) must be connected to GND for thermal performance |
| V2 | 1.2V supply monitor input | Fixed 1.122V threshold comparator input - dedicated to monitoring 1.2V rails without external components (LTC2911-4 function) |
| V1 | 3.3V supply monitor input & power source | 3.086V threshold input; also supplies internal VCC (with V2) - requires 0.1µF bypass capacitor for stability |
| PFO | Power-fail open-drain output | Pulls low when PFI < 500mV; weak internal pull-up to V1 (29µA); supports external pull-up for higher VOH or faster rise time |
| RST | Reset open-drain output | Pulls low if any monitored input (V1/V2/ADJ) drops below threshold; same pull-up structure as PFO; latchable via TMR |
Key Features
| Feature | Design Value |
|---|---|
| Triple simultaneous monitoring | Monitors 3.3V (V1), 1.2V (V2), and adjustable rail (ADJ) in single TSOT-23-8 package - reduces BOM count vs discrete supervisors |
| ±1.5% threshold accuracy | Guaranteed over full –40°C to 85°C range - eliminates need for derating margins in industrial temperature designs |
| 0.5V minimum VCC operation | Ensures RST/PFO remain valid during deep brown-out - prevents MCU lockup or undefined state during power ramp-down |
| Configurable reset timeout | Internal 200ms (no capacitor) or external 15–27ms (2.2nF) - balances startup reliability against boot-time latency |
| Power-fail early warning | PFO asserts before V1/V2/ADJ fail - enables controlled shutdown (e.g., NMI-driven save-to-EEPROM) prior to system crash |
| Latch mode for margin testing | TMR = GND holds RST state regardless of input voltages - simplifies validation of system behavior under undervoltage stress |
Applications
| Industrial PLC Power Sequencing | Automotive ADAS Camera Module |
|---|---|
|
Use Scenario: Monitoring 3.3V I/O, 1.2V core, and 5V analog supply in programmable logic controller backplane with strict startup order requirements. IC Role / Device Role / Timing Role: Triple supervisor ensures all rails stabilize before FPGA configuration begins; PFO triggers watchdog reset if 5V rail collapses mid-operation. Use Value: Eliminates need for three separate reset ICs; ±1.5% accuracy guarantees no false resets during 10°C/min thermal cycling in cabinet environments. |
Use Scenario: Validating stable power delivery to image sensor, ISP, and CAN transceiver in automotive camera ECU operating from 12V battery with wide input variation. IC Role / Device Role / Timing Role: V1 monitors 3.3V sensor interface, V2 monitors 1.2V ISP core, ADJ monitors 5V analog supply; PFO signals battery sag to MCU before brown-out. Use Value: 0.5V VCC operation ensures RST remains asserted until battery recovers - prevents partial boot and corrupted frame buffers. |
| Network Switch ASIC Power Management | Medical Infusion Pump Controller |
|
Use Scenario: Coordinating power-up of multi-rail ASIC (1.2V core, 3.3V I/O, 1.8V memory) in enterprise switch line card with hot-swap capability. IC Role / Device Role / Timing Role: Monitors all three rails simultaneously; TMR latch mode enables in-system voltage margining without disrupting ASIC boot sequence. Use Value: Internal 200ms timeout aligns with ASIC's required POR delay; 30µA quiescent current minimizes standby loss in always-on management subsystem. |
Use Scenario: Ensuring safe power-on of motor driver, display, and safety-critical MCU in battery-powered infusion pump with dual Li-ion cells. IC Role / Device Role / Timing Role: V1 tracks 3.3V MCU supply, V2 tracks 1.2V ADC reference, ADJ monitors battery stack voltage via divider; PFO initiates graceful shutdown at 6.8V. Use Value: PFI hysteresis prevents oscillation during battery voltage ripple; ±1.5% accuracy meets 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 |
|---|---|---|---|
| MAX6369KA29+T | Fixed 2.93V/3.08V/3.3V thresholds; no adjustable ADJ input; 200ms fixed timeout only; 1.5µA quiescent current | Lacks configurable third threshold and PFI early-warning - suitable only for fixed-rail systems without power-fail signaling needs | Select when monitoring three fixed voltages (e.g., 3.3V/2.5V/1.8V) and ultra-low power (<2µA) is critical; not suitable for 1.2V or adjustable rails |
| TPS3808G33DBVR | Single 3.3V monitor with adjustable timeout; no V2/ADJ inputs; no PFI/PFO functionality; 16µA quiescent current | Requires two additional ICs to match triple-monitor + power-fail capability - increases board area and BOM cost | Choose only for simple 3.3V-only supervision where space allows multiple devices; cannot replace LTC2911CTS8-4#TRMPBF's integrated functionality |
Compared with MAX6369KA29+T and TPS3808G33DBVR, the LTC2911CTS8-4#TRMPBF uniquely integrates 3.3V/1.2V/adjustable monitoring, power-fail warning, and latch-mode margin testing in one TSOT-23-8 package - reducing component count by ≥2 and enabling single-chip compliance with IEC 61508 SIL-2 power integrity requirements.
Availability
LTC2911CTS8-4#TRMPBF is available at Aetrix Electronics and suitable for industrial PLCs, automotive ADAS modules, network switch ASICs, and medical infusion pumps requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LTC2911CTS8-4#TRMPBF 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 precision multi-rail power monitoring in space-constrained embedded systems - emphasizing ±1.5% threshold accuracy, sub-1V operation, and integrated power-fail signaling to simplify system-level power integrity validation.
FAQ
What is the exact V2 threshold voltage for LTC2911CTS8-4#TRMPBF?
The LTC2911CTS8-4#TRMPBF is the LTC2911-4 variant, with a factory-trimmed V2 threshold of 1.122V ±1.5% (i.e., 1.104V to 1.140V) over –40°C to 85°C. This corresponds to a –6.5% trip point for a nominal 1.2V supply, ensuring reliable detection before the rail exits its ±5% tolerance band. The value is specified in the Electrical Characteristics table under VRT12.
Does LTC2911CTS8-4#TRMPBF require external components for basic operation?
Yes - LTC2911CTS8-4#TRMPBF requires a 0.1µF ceramic bypass capacitor on V1 to GND for stability, and a pull-up resistor on RST/PFO if driving loads exceeding 29µA (its internal pull-up strength). For internal 200ms timeout, tie TMR to V1; for adjustable timeout, connect CTMR to GND. No external components are needed for V2 (1.2V) or V1 (3.3V) monitoring.
Can LTC2911CTS8-4#TRMPBF monitor a 5V supply?
No - LTC2911CTS8-4#TRMPBF is the LTC2911-4 variant, configured exclusively for 3.3V (V1) and 1.2V (V2) monitoring. To monitor 5V, select LTC2911CTS8-1#TRMPBF (V2 = 5V) or use the ADJ pin with a resistive divider from the 5V rail to set a custom threshold (e.g., 4.675V for 5V –6.5%). The V2 pin itself is not rated for 5V input.
How does the PFI hysteresis work in LTC2911CTS8-4#TRMPBF?
The PFI input in LTC2911CTS8-4#TRMPBF has asymmetric hysteresis: it trips low at 500mV (falling edge) and releases high at 515mV (rising edge), yielding 15mV (3%) hysteresis. This prevents chatter during noisy or slowly recovering supplies. The hysteresis is internal and fixed - no external components are required, though a capacitor on PFI can add further filtering if needed.
What is the maximum allowable leakage current for the external timing capacitor on TMR?
The external timing capacitor (CTMR) for LTC2911CTS8-4#TRMPBF must exhibit ≤500nA leakage current to maintain timing accuracy. Higher leakage causes significant timeout deviation - e.g., 1µA leakage may shift a 20ms timeout by >30%. Use Class I C0G/NP0 ceramic capacitors; avoid X7R/Y5V types due to voltage/temperature-dependent leakage.
LTC2911CTS8-4#TRMPBF 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:
- 1.122V, 3.086V, 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
LTC2911CTS8-4#TRMPBF FAQ
1.How can I place an order for LTC2911CTS8-4#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2911CTS8-4#TRMPBF 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 LTC2911CTS8-4#TRMPBF reliable?
The price and inventory of LTC2911CTS8-4#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2911CTS8-4#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC2911CTS8-4#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2911CTS8-4#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2911CTS8-4#TRMPBF?
LTC2911CTS8-4#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2911CTS8-4#TRMPBF 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 LTC2911CTS8-4#TRMPBF?
For technical support, including LTC2911CTS8-4#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2911CTS8-4#TRMPBF requirements.
6.How does Aetrix verify that LTC2911CTS8-4#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC2911CTS8-4#TRMPBF 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 LTC2911CTS8-4#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC2911CTS8-4#TRMPBF?
All LTC2911CTS8-4#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2911CTS8-4#TRMPBF, 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 LTC2911CTS8-4#TRMPBF part is unused and in its original packaging.
Return procedure for LTC2911CTS8-4#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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