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Analog Devices Inc. LTC2911CTS8-4#TRPBF
- Part No.:
- LTC2911CTS8-4#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
LTC2911CTS8-4#TRPBF.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:3,025
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Product details
Overview
LTC2911CTS8-4#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), 1.2V (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 power management systems.
For engineers reviewing the LTC2911CTS8-4#TRPBF datasheet, LTC2911CTS8-4#TRPBF pinout, LTC2911CTS8-4#TRPBF application, or LTC2911CTS8-4#TRPBF equivalent, key selection criteria include its fixed 3.3V/1.2V dual-supply monitoring configuration, PFI-based early power-fail warning capability, TMR latch function for margin testing, and TSOT-23-8 package compatibility with space-constrained industrial and computing designs.
Technical Context
The LTC2911CTS8-4#TRPBF implements three independent voltage comparators: one fixed 3.3V monitor (V1), one fixed 1.2V monitor (V2), and one adjustable 0.5V-threshold input (ADJ) configurable via resistive divider. Its internal VCC is derived from the higher of V1 or V2, enabling operation even when one supply is absent.
It integrates a dedicated power-fail comparator (PFI/PFO) with 500mV falling-edge threshold and 15mV hysteresis, plus a TMR pin supporting three modes: external capacitor timeout, internal 200ms timeout (TMR = V1), and latch mode (TMR = GND) to hold RST state during system margining.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| V1 Threshold | 3.086V nominal (3.3V −6.5%), ±1.5% over temperature - ensures accurate 3.3V rail supervision without false resets |
| V2 Threshold | 1.122V nominal (1.2V −6.5%), ±1.5% over temperature - precisely monitors 1.2V logic or core supplies |
| ADJ Threshold | 500mV ±7.5mV - enables configurable third supply monitoring via external resistor divider |
| Reset Timeout | Internally fixed 200ms (TMR tied to V1) - eliminates external timing capacitor while guaranteeing sufficient de-bounce delay |
| PFI Threshold | 500mV falling edge, 515mV rising edge - provides noise-immune early warning of primary supply collapse |
| Supply Current | 30µA typical at 25°C - minimizes loading on monitored rails in battery-backed or low-power systems |
| Operating Temp | –40°C to +85°C (I-grade) - qualified for industrial and automotive under-hood environments |
Pinout & Package
Package: 8-lead TSOT-23 (TS8), 3mm × 1.75mm footprint, lead-free (PBF), thermal resistance θJA = 195°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PFI | Power-fail input | Monitors primary supply via resistive divider; asserts PFO low when voltage falls below 500mV |
| ADJ | Adjustable monitor input | Configurable third threshold (0.5V) for custom supply monitoring using external resistor network |
| TMR | Reset timeout/latch control | Selects internal 200ms timeout (TMR = V1) or latches RST low (TMR = GND) for margin testing |
| GND | Device ground reference | Return path for all internal comparators and output drivers; must be low-impedance |
| V2 | 1.2V supply monitor input | Dedicated −6.5% undervoltage detector for 1.2V rails; high-impedance input draws ≤30µA |
| V1 | 3.3V supply monitor input & VCC source | Primary 3.3V rail monitor and internal power source; bypass with ≥0.1µF capacitor |
| PFO | Power-fail logic output | Open-drain output pulled low on PFI threshold breach; provides early warning before RST assertion |
| RST | Reset logic output | Open-drain reset signal asserted low if any monitored supply (V1/V2/ADJ) falls below threshold |
Key Features
| Feature | Design Value |
|---|---|
| Triple simultaneous monitoring | Independent 3.3V, 1.2V, and adjustable thresholds enable single-chip supervision of multi-rail systems |
| ±1.5% threshold accuracy | Guaranteed over full temperature range reduces system voltage margin requirements and prevents nuisance resets |
| Power-fail comparator with hysteresis | 500mV/515mV thresholds with 15mV hysteresis reject noise while ensuring clean PFO transitions |
| Reset latch via TMR pin | Grounding TMR holds RST state indefinitely - simplifies factory margin testing without firmware intervention |
| Ultralow VCC operation | Guaranteed RST/PFO functionality down to 0.5V VCC prevents indeterminate outputs during brown-out conditions |
Applications
| Industrial PLC Power Sequencing | Automotive ADAS Camera Module |
|---|---|
Use Scenario: Supervises 3.3V I/O, 1.2V core, and 5V analog supply in programmable logic controller backplane with strict startup order. IC Role / Device Role / Timing Role: Triple monitor ensures all rails are stable before enabling FPGA configuration and communication interfaces. Use Value: Prevents configuration corruption by enforcing minimum 200ms post-stabilization delay before releasing RST. | Use Scenario: Monitors 3.3V sensor interface, 1.2V image processor core, and 12V battery-derived supply in rear-view camera ECU. IC Role / Device Role / Timing Role: PFI input watches battery voltage via divider; PFO triggers NMI interrupt 100ms before brown-out causes RST assertion. Use Value: Enables safe image buffer flush and EEPROM state save before power loss - critical for ASIL-B compliance. |
| Network Switch ASIC Power Management | Medical Infusion Pump Controller |
Use Scenario: Validates 3.3V management bus, 1.2V SerDes core, and adjustable 1.8V PHY supply in 10G Ethernet switch line card. IC Role / Device Role / Timing Role: ADJ pin configured for 1.8V rail; TMR pin used to temporarily disable reset during hot-swap insertion. Use Value: Latch mode prevents spurious resets during transient voltage dips during live board insertion. | Use Scenario: Supervises 3.3V microcontroller, 1.2V ADC/DAC, and adjustable 2.5V pump motor driver in battery-powered infusion device. IC Role / Device Role / Timing Role: ADJ input monitors motor driver rail; RST assertion halts delivery upon undervoltage detection. Use Value: ±1.5% threshold accuracy ensures consistent trip point across temperature - avoids false shutdowns during clinical use. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6314US33D3+T | Fixed 3.3V/3.3V/3.3V triple monitor; no adjustable input or PFI; 200ms fixed timeout | Lacks power-fail warning and third-rail flexibility; suitable only for identical-voltage systems | Choose only if all three rails are 3.3V and early warning is unnecessary |
| TPS3808G33DBVR | Single 3.3V supervisor with adjustable delay; no V2/ADJ monitoring or PFI | Requires two additional supervisors to match LTC2911CTS8-4#TRPBF's triple-monitor capability | Select when board area allows discrete supervision per rail and PFI is not required |
Compared with MAX6314US33D3+T and TPS3808G33DBVR, the LTC2911CTS8-4#TRPBF uniquely integrates 3.3V/1.2V/adjustable monitoring, PFI-based predictive shutdown, and latch-enabled margin testing in a single TSOT-23-8 package - reducing BOM count and PCB footprint while enabling advanced power management functions.
Availability
LTC2911CTS8-4#TRPBF 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.
Supply support for LTC2911CTS8-4#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 product line delivers precision voltage supervision ICs optimized for multi-rail systems where reliability, accuracy, and predictive power-fail signaling are critical - especially in safety-critical and mission-critical embedded applications.
FAQ
What is the exact V2 threshold voltage for LTC2911CTS8-4#TRPBF?
The LTC2911CTS8-4#TRPBF has a nominal V2 threshold of 1.122V (1.2V −6.5%), with ±1.5% accuracy over the full –40°C to +85°C operating range. This corresponds to a guaranteed threshold band of 1.104V to 1.140V, as specified in the Electrical Characteristics table for the LTC2911-4 variant. The part marking "LFPM" confirms its -4 designation.
Does LTC2911CTS8-4#TRPBF support external reset timeout configuration?
No - the LTC2911CTS8-4#TRPBF is the -4 variant with fixed internal 200ms reset timeout. External timeout requires connecting a capacitor to the TMR pin, which is only supported in the base LTC2911 family (e.g., LTC2911CTS8-#TRPBF without suffix). For this part, TMR must be tied to V1 to enable the internal timer; leaving it floating or grounding it activates latch mode instead.
Can LTC2911CTS8-4#TRPBF monitor a 5V supply?
No - the LTC2911CTS8-4#TRPBF is specifically configured for 3.3V (V1) and 1.2V (V2) monitoring. To supervise a 5V rail, select the LTC2911CTS8-1#TRPBF variant, which pairs 3.3V and 5V thresholds. The -4 suffix denotes the 1.2V V2 option; attempting to apply 5V to V2 exceeds absolute maximum ratings and risks damage.
How does the PFI input function in LTC2911CTS8-4#TRPBF?
The PFI input in LTC2911CTS8-4#TRPBF is a dedicated 500mV-threshold comparator that drives the PFO output low when the applied voltage falls below 500mV (with 15mV hysteresis). It operates independently of V1/V2/ADJ monitoring and is intended for early warning of primary supply collapse - for example, monitoring a DC/DC input or battery stack via a resistive divider.
Is LTC2911CTS8-4#TRPBF pin-compatible with other LTC2911 variants in TSOT-23-8?
Yes - all LTC2911 variants in the TSOT-23-8 package (TS8), including LTC2911CTS8-4#TRPBF, share identical pinout, electrical characteristics, and package dimensions. The only functional differences are the factory-trimmed V2 thresholds (1.2V for -4) and default reset timeout behavior; no PCB layout changes are needed when substituting between -1 through -5 variants.
LTC2911CTS8-4#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:
- 1.122V, 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#TRPBF FAQ
1.How can I place an order for LTC2911CTS8-4#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2911CTS8-4#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 LTC2911CTS8-4#TRPBF reliable?
The price and inventory of LTC2911CTS8-4#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2911CTS8-4#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2911CTS8-4#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2911CTS8-4#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2911CTS8-4#TRPBF?
LTC2911CTS8-4#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2911CTS8-4#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 LTC2911CTS8-4#TRPBF?
For technical support, including LTC2911CTS8-4#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2911CTS8-4#TRPBF requirements.
6.How does Aetrix verify that LTC2911CTS8-4#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2911CTS8-4#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 LTC2911CTS8-4#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2911CTS8-4#TRPBF?
All LTC2911CTS8-4#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2911CTS8-4#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 LTC2911CTS8-4#TRPBF part is unused and in its original packaging.
Return procedure for LTC2911CTS8-4#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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