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Analog Devices Inc. LTC2911HTS8-5#TRPBF
- Part No.:
- LTC2911HTS8-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
LTC2911HTS8-5#TRPBF.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL TSOT23-8
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LTC2911HTS8-5#TRPBF from Analog Devices (formerly Linear Technology) is a high-accuracy 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 +125°C, supports internal 200ms or external capacitor–programmable reset timeout, and delivers ultralow-voltage operation down to VCC = 0.5V - used in automotive engine control units for multi-rail voltage supervision during cold-crank conditions.
For engineers reviewing the LTC2911HTS8-5#TRPBF datasheet, LTC2911HTS8-5#TRPBF pinout, LTC2911HTS8-5#TRPBF application, or LTC2911HTS8-5#TRPBF equivalent, key selection criteria include its H-grade automotive temperature range, TSOT-23-8 package, triple-monitor architecture with independent PFI/PFO early-warning capability, and TMR-pin latch mode for margin testing under controlled voltage stress.
Technical Context
The LTC2911HTS8-5#TRPBF implements three independent comparators: V1 fixed at 3.3V (–6.5% trip = 3.086V), V2 configured as adjustable input (0.5V nominal threshold), and ADJ also adjustable (0.5V nominal). All feature 1.5% threshold accuracy across –40°C to +125°C and built-in glitch filtering for noise immunity.
Its power-fail path uses PFI (500mV falling / 515mV rising threshold) to drive PFO low for early warning; RST asserts low when any monitored input falls below its threshold and remains latched via TMR pin pulled to GND - enabling deterministic margin testing without system reset interference.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| V1 Threshold | 3.086V (3.3V –6.5%), guaranteed over full –40°C to +125°C operating range |
| V2/ADJ Threshold | 500mV ±7.5mV (±1.5%), enables precise resistive-divider configuration of custom supply trip points |
| PFI Threshold | 500mV falling edge / 515mV rising edge (3% hysteresis), ensures stable early-warning signaling against supply ripple |
| Reset Timeout | Internally fixed 200ms (TMR tied to V1) or externally programmable (CTMR = 2.2nF → 20ms) |
| Supply Current | 30µA typical at 25°C, <35µA over full temperature range - enables always-on monitoring in battery-backed systems |
| Min Operating Voltage | 0.5V guaranteed VCC operation - maintains valid RST/PFO logic states during deep brownout |
| Package | 8-lead TSOT-23 (3.0mm × 1.7mm), lead-free (Pb-free), RoHS-compliant |
Pinout & Package
Package: 8-lead TSOT-23 (3.0mm × 1.7mm), exposed pad not present (TS8 variant), rated for TJMAX = 150°C, θJA = 195°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PFI | Power-fail input | Monitors external supply via resistive divider; triggers PFO low at 500mV falling edge for early shutdown warning |
| ADJ | Adjustable monitor input | 0.5V threshold comparator; accepts resistive-divider output to set third supply trip point |
| TMR | Reset timeout/latch control | Tied to V1 → 200ms internal timeout; pulled to GND → latches RST state for margin testing |
| GND | Device ground reference | Common return for all analog comparators and digital outputs; must be low-impedance |
| V2 | Adjustable supply monitor input | High-impedance 0.5V threshold input (LTC2911-5 variant); replaces fixed-V2 options with flexible rail monitoring |
| V1 | 3.3V supply monitor & power source | Fixed 3.3V (–6.5%) trip point; supplies internal VCC for LTC2911-5; requires 0.1µF bypass capacitor |
| PFO | Power-fail logic output | Open-drain output pulled weakly to V1 (29µA typ); signals imminent supply failure before RST asserts |
| RST | Reset logic output | Open-drain output pulled weakly to V1; goes low if V1, V2, or ADJ falls below threshold for >timeout period |
Key Features
| Feature | Design Value |
|---|---|
| Triple simultaneous monitoring | Independent V1 (3.3V), V2 (adjustable), and ADJ (adjustable) comparators enable single-chip supervision of primary, secondary, and auxiliary rails |
| ±1.5% threshold accuracy | Guaranteed over –40°C to +125°C eliminates need for derating margins in automotive under-hood applications |
| Configurable reset timeout | Internal 200ms or external capacitor (9.4ms/nF) allows optimization between fast startup and noise-immune delay |
| Power-fail early warning (PFO) | PFI-to-PFO path with 3% hysteresis provides reliable pre-reset alert for controlled shutdown sequencing |
| Reset latch via TMR pin | Pulling TMR to GND freezes RST state - essential for voltage margining tests without unintended system resets |
Applications
| Engine Control Unit (ECU) Power Supervision | Automotive Infotainment SoC Sequencing |
|---|---|
Use Scenario: Monitors 3.3V microcontroller core, 5V CAN transceiver, and 1.2V GPU rail in an engine bay ECU exposed to –40°C to +125°C ambient. IC Role / Device Role / Timing Role: Triple-supply monitor with PFO-driven CAN bus shutdown initiation and latched RST for post-cold-crank diagnostics. Use Value: Prevents false resets during cranking-induced 5V droop by using PFI to trigger PFO 50ms before V2 falls below 4.675V, allowing graceful CAN termination. | Use Scenario: Supervises 3.3V application processor, 1.8V DDR memory, and adjustable 0.85V GPU core in a head-unit SoC with multi-stage power sequencing. IC Role / Device Role / Timing Role: Configures V2 and ADJ via resistive dividers to match exact SoC rail thresholds; uses TMR latch to validate undervoltage tolerance during production test. Use Value: Enables margin testing at 90% nominal voltage without resetting the SoC - critical for validating brownout recovery firmware. |
| Industrial PLC I/O Module | Electric Vehicle Battery Management Interface |
Use Scenario: Ensures reliable operation of isolated 24V fieldbus interface, 5V logic, and 3.3V FPGA in a DIN-rail mounted PLC exposed to wide thermal cycling. IC Role / Device Role / Timing Role: Uses V1=3.3V, V2=5V, ADJ=24V (via divider) monitoring; PFO alerts main controller of 24V rail degradation before RST asserts. Use Value: Provides 120ms advance warning (PFO low) before 24V rail collapse triggers RST, enabling safe I/O state freeze and fault logging. | Use Scenario: Monitors 12V system bus, 5V MCU, and adjustable cell-stack voltage (via PFI divider) in a BMS communication interface board. IC Role / Device Role / Timing Role: Configures PFI to detect Li-ion stack voltage decay; uses ADJ to supervise isolated 3.3V data link supply. Use Value: Triggers PFO at 32V (PFI = 0.5V) to initiate controlled BMS shutdown before cell undervoltage lockout, preserving data integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-supply monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G33DBVR | Single 3.3V reset only; no PFI, no adjustable V2/ADJ, no latch mode; 2% threshold accuracy | Only suitable for basic 3.3V-only reset; cannot replace triple-monitor or power-fail functions | Select only if supervising one rail and early-warning signaling is unnecessary |
| MAX6816EUT+T | Single-channel, push-pull RST output; no PFO; no adjustable inputs; 2.5% accuracy; SOT-23-6 | Lacks multi-rail capability and power-fail warning; limited to simple microprocessor reset | Use only for cost-sensitive, single-rail designs where PFO and latch features are omitted |
Compared with TPS3808G33DBVR and MAX6816EUT+T, the LTC2911HTS8-5#TRPBF uniquely delivers triple-rail monitoring, configurable PFI-based early warning, and TMR-latch functionality - making it irreplaceable in automotive and industrial systems requiring coordinated multi-supply supervision and margin testing.
Availability
LTC2911HTS8-5#TRPBF is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC modules, electric vehicle battery management interfaces, and infotainment SoC power sequencing requiring stable component supply across extended temperature ranges.
Supply support for LTC2911HTS8-5#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.
The LTC2911 product line was designed specifically for high-reliability, multi-rail voltage supervision in automotive, industrial, and telecom infrastructure - emphasizing precision threshold accuracy, ultralow-voltage operation, and robust noise immunity.
FAQ
What is the guaranteed operating temperature range for the LTC2911HTS8-5#TRPBF?
The LTC2911HTS8-5#TRPBF is rated for –40°C to +125°C (automotive H-grade), with all electrical specifications - including ±1.5% threshold accuracy and 30µA quiescent current - guaranteed across this full range. This makes LTC2911HTS8-5#TRPBF suitable for under-hood automotive applications and high-temperature industrial environments where standard commercial or industrial grade parts would fail.
How does the PFI input function in the LTC2911HTS8-5#TRPBF, and what is its threshold behavior?
The PFI input in the LTC2911HTS8-5#TRPBF has a nominal 500mV falling-edge threshold and 515mV rising-edge threshold (3% hysteresis), providing noise-immune early-warning signaling. When the voltage at PFI drops below 500mV, PFO pulls low to warn of impending power failure. The hysteresis prevents chatter during marginal supply conditions. This behavior is fully specified and tested for LTC2911HTS8-5#TRPBF across its –40°C to +125°C range.
Can the LTC2911HTS8-5#TRPBF monitor three adjustable supplies, or is V1 fixed at 3.3V?
The LTC2911HTS8-5#TRPBF has a fixed 3.3V (–6.5%) threshold on V1 (3.086V), while both V2 and ADJ are adjustable inputs with 0.5V nominal thresholds - enabling configuration of two custom supply trip points via resistive dividers. This gives LTC2911HTS8-5#TRPBF true triple-monitor capability: one fixed (V1), two adjustable (V2, ADJ), unlike variants such as LTC2911-1 that fix V2 at 5V.
What is the purpose of the TMR pin in the LTC2911HTS8-5#TRPBF, and how is it used for margin testing?
The TMR pin in the LTC2911HTS8-5#TRPBF controls reset timeout and enables latch mode: tying TMR to V1 selects internal 200ms timeout; pulling TMR to GND latches the current RST state (high or low) regardless of input voltages. During margin testing, this allows engineers to force RST low at reduced supply levels and hold it while verifying system behavior - a capability not found in basic reset supervisors and essential for automotive qualification.
Does the LTC2911HTS8-5#TRPBF require external pull-up resistors on RST and PFO, or do they have internal pull-ups?
The RST and PFO pins of the LTC2911HTS8-5#TRPBF feature internal weak pull-ups to V1 (typically 29µA at V1 = 3.3V), eliminating the need for external pull-ups in most cases. However, external pull-ups are recommended when faster rise times or VOH > V1 are required. The internal pull-up strength is fully characterized and guaranteed across temperature for LTC2911HTS8-5#TRPBF, supporting direct interfacing with 3.3V logic without additional components.
LTC2911HTS8-5#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:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-8
LTC2911HTS8-5#TRPBF FAQ
1.How can I place an order for LTC2911HTS8-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2911HTS8-5#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 LTC2911HTS8-5#TRPBF reliable?
The price and inventory of LTC2911HTS8-5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2911HTS8-5#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2911HTS8-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2911HTS8-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2911HTS8-5#TRPBF?
LTC2911HTS8-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2911HTS8-5#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 LTC2911HTS8-5#TRPBF?
For technical support, including LTC2911HTS8-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2911HTS8-5#TRPBF requirements.
6.How does Aetrix verify that LTC2911HTS8-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2911HTS8-5#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 LTC2911HTS8-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2911HTS8-5#TRPBF?
All LTC2911HTS8-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2911HTS8-5#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 LTC2911HTS8-5#TRPBF part is unused and in its original packaging.
Return procedure for LTC2911HTS8-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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