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Analog Devices Inc. LTC2918CMS-B1#TRPBF
- Part No.:
- LTC2918CMS-B1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC2918CMS-B1#TRPBF.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,447
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Product details
Overview
LTC2918CMS-B1#TRPBF from Analog Devices (formerly Linear Technology) is a precision voltage supervisor IC with manual reset input, 9 selectable supply thresholds (12V to 0.5V ADJ), fixed –5% tolerance, and windowed watchdog timer. It operates from 1.5V to 5.5V, consumes 30μA quiescent current, guarantees ±1.5% threshold accuracy over –40°C to 85°C, and delivers 200ms internal reset timeout - used in automotive control systems for reliable power-on reset and fault recovery.
For engineers reviewing the LTC2918CMS-B1#TRPBF datasheet, LTC2918CMS-B1#TRPBF pinout, LTC2918CMS-B1#TRPBF application, or LTC2918CMS-B1#TRPBF equivalent, this page provides verified functional specifications, validated pin-level circuit roles, confirmed B1-series windowed watchdog behavior, and real-world design meaning for reset timing, VM threshold selection, and MR interface compatibility.
Technical Context
The LTC2918CMS-B1#TRPBF implements a dual-stage supervision architecture: a high-accuracy comparator monitors VM against one of nine factory-programmed thresholds selected via SEL1/SEL2 three-state inputs, while a dedicated windowed watchdog logic block enforces both upper (1.6s) and lower (50ms) timing boundaries on WDI falling edges. Its RST output is open-drain with guaranteed low-voltage operation down to VCC = 0.8V.
Unlike the A-version, the B1 variant strictly requires WDI falling edges to occur within the tWDL–tWDU window to avoid reset assertion; it integrates an internal 100kΩ pull-up on MR, supports shunt regulation up to 6.2V on VCC, and maintains ±1.5% threshold accuracy across temperature without external calibration components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | 1.5V to 5.5V - powers directly from logic rails; internal 6.2V shunt enables operation up to 12V with series resistor |
| Threshold Accuracy | ±1.5% over –40°C to 85°C - ensures no nuisance resets for supplies with ±5% nominal tolerance |
| Reset Timeout | 200ms (RT tied to VCC) - eliminates need for external capacitor in standard power-up sequencing |
| Watchdog Type | Windowed (B1 version) - requires WDI falling edge between 50ms and 1.6s to prevent false system reset |
| Quiescent Current | 30μA typical - enables use in battery-backed or always-on monitoring circuits |
| VM Input Impedance | 0.5–8MΩ - allows direct connection to low-leakage voltage dividers for ADJ-mode threshold setting |
| MR Input Logic | Active-low with 100kΩ internal pull-up - interfaces directly to momentary pushbutton without external components |
Pinout & Package
Package: 10-Lead MSOP (3mm × 3mm), RoHS-compliant, rated for 0°C to 70°C operating range.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND | Ground reference | Primary return path for all internal comparators, timers, and output driver |
| MR | Manual Reset input | Active-low signal with internal 100kΩ pull-up; initiates full reset cycle when asserted |
| SEL2 | Threshold select bit 1 | Three-state input (VCC/GND/open) selecting one of nine nominal VM thresholds per Table 1 |
| SEL1 | Threshold select bit 0 | Three-state input (VCC/GND/open); combined with SEL2 determines monitored voltage (e.g., 1.8V, 3.3V) |
| VM | Monitor input | High-impedance comparator input; threshold set by SEL1/SEL2 and fixed –5% tolerance |
| RST | Open-drain reset output | Asserts low during undervoltage or watchdog fault; requires external pull-up to logic rail |
| RT | Reset timeout control | Tie to VCC for 200ms internal timeout; leave open for ~400μs; connect capacitor for adjustable delay |
| WT | Watchdog timeout control | Tie to VCC for 1.6s internal upper bound; open for 3.2ms; capacitor sets precise windowed timeout |
| WDI | Watchdog input | Falling-edge sensitive only (B1); must toggle within 50ms–1.6s window to avoid RST assertion |
| VCC | Power supply input | Operates 1.5V–5.5V; includes 6.2V shunt regulator for >5.7V supplies with current-limiting resistor |
Key Features
| Feature | Design Value |
|---|---|
| 9-Select Threshold Architecture | Eliminates external resistor networks - SEL1/SEL2 configure 12V, 5V, 3.3V, 2.5V, 1.8V, 1.5V, 1.2V, 1.0V, or ADJ (0.5V) thresholds |
| Windowed Watchdog (B1) | Prevents both missed and premature watchdog pulses - mandatory falling-edge timing window improves safety-critical reliability |
| Guaranteed Operation at 0.8V VCC | Ensures valid reset assertion during brown-out conditions before microcontroller core loses functionality |
| Glitch-Filtered Comparator | Rejects transients <100μs duration at VM - prevents false resets from load-switch noise or EMI coupling |
| Integrated MR Pull-Up | Enables pushbutton reset with zero external parts - reduces BOM count and PCB area in space-constrained designs |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC I/O Module |
|---|---|
Use Scenario: Monitors 5V sensor supply rail in harsh under-hood environment where voltage dips occur during cranking. IC Role / Device Role / Timing Role: Voltage supervisor asserting RST during undervoltage; windowed watchdog verifies MCU firmware execution integrity. Use Value: Prevents corrupted CAN message transmission by enforcing clean reset and detecting software lockup within 50ms–1.6s window. |
Use Scenario: Supervises 3.3V FPGA configuration voltage in programmable logic controller with field-replaceable I/O cards. IC Role / Device Role / Timing Role: Provides power-on reset and manual reset via front-panel button; uses ADJ mode to monitor custom 2.85V rail. Use Value: Eliminates need for discrete resistors and external RC networks - simplifies certification for IEC 61000-4-2/4-4 immunity testing. |
| Medical Infusion Pump Controller | Telecom Base Station Power Management |
Use Scenario: Ensures safe shutdown when 12V main supply drops below 11.04V (12V–5%) during battery switchover. IC Role / Device Role / Timing Role: High-accuracy supervisor with 200ms reset hold time; MR pin enables clinician-initiated recalibration reset. Use Value: Meets ISO 13485 requirement for deterministic fault response - ±1.5% threshold accuracy avoids spurious alarms. |
Use Scenario: Monitors +ADJ (0.5V) reference derived from 48V telecom supply using precision resistor divider. IC Role / Device Role / Timing Role: Configured in ADJ mode with external divider; windowed watchdog guards ARM-based management processor. Use Value: Enables single-supervisor solution for multi-rail systems - reduces board area vs. discrete supervisors per rail. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326US29D3+T | Fixed 2.93V threshold; no selectable voltages or windowed watchdog; 3-pin SOT23 package | Suitable only for single-rail 3.3V systems; lacks manual reset and programmable timing | Select when cost and footprint are primary constraints and only 2.93V monitoring is required |
| TPS3808G33DBVR | Fixed 3.3V threshold; adjustable reset timeout (1–10s); no watchdog or manual reset; 5-pin SOT23 | Supports longer reset delays but cannot supervise 1.8V/1.2V rails or provide windowed fault detection | Choose for extended power-fail hold-up timing in non-safety-critical industrial controllers |
Compared with MAX6326US29D3+T and TPS3808G33DBVR, the LTC2918CMS-B1#TRPBF offers unique flexibility in threshold selection, integrated manual reset, and certified windowed watchdog behavior - making it irreplaceable in multi-rail automotive and medical systems requiring configurable, high-integrity supervision.
Availability
LTC2918CMS-B1#TRPBF is available at Aetrix Electronics and suitable for automotive control systems, industrial PLC modules, medical infusion pump controllers, and telecom base station power management requiring stable component supply and long-term lifecycle support.
Supply support for LTC2918CMS-B1#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 (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.
The LTC2918 belongs to Linear's precision power monitoring product line, designed specifically for automotive, industrial, and medical applications demanding guaranteed threshold accuracy, robust glitch immunity, and fail-safe watchdog supervision.
FAQ
What is the function of the MR pin on the LTC2918CMS-B1#TRPBF?
The MR (Manual Reset) pin on the LTC2918CMS-B1#TRPBF is an active-low input with an internal 100kΩ pull-up resistor to VCC. When pulled low, it forces the RST output low for the full reset timeout period (e.g., 200ms when RT = VCC), then releases it. This enables direct pushbutton interfacing without external components - a key differentiator from the LTC2917 series and most competing supervisors.
How does the windowed watchdog feature work in the LTC2918CMS-B1#TRPBF?
The LTC2918CMS-B1#TRPBF implements a true windowed watchdog: WDI falling edges must occur strictly between 50ms (tWDL) and 1.6s (tWDU) after the prior edge. Edges outside this window - too fast or too slow - assert RST. Unlike standard watchdogs, this prevents both stuck-at-high software faults and excessively rapid toggling, meeting ASIL-B requirements for automotive safety systems.
Can the LTC2918CMS-B1#TRPBF monitor a 1.2V supply, and what is its accuracy?
Yes, the LTC2918CMS-B1#TRPBF monitors 1.2V supplies using SEL1 = GND and SEL2 = VCC. Its guaranteed threshold accuracy is ±1.5% over –40°C to 85°C, so the actual trip point falls between 1.122V and 1.140V. This exceeds the ±100mV tolerance typically required for 1.2V FPGA core rails, ensuring reliable supervision without margining resistors.
What happens to RST when VCC drops below 1.5V on the LTC2918CMS-B1#TRPBF?
When VCC drops below the 1.5V undervoltage lockout (UVLO) threshold, the LTC2918CMS-B1#TRPBF asserts RST low regardless of VM state. This behavior continues until VCC rises above UVLO and VM exceeds the selected threshold, after which the reset timeout begins. RST remains asserted down to VCC = 0.8V, ensuring reset validity even during deep brown-out conditions.
Is the LTC2918CMS-B1#TRPBF compatible with 12V supply monitoring using its internal shunt regulator?
Yes - the LTC2918CMS-B1#TRPBF includes a 6.2V shunt regulator on VCC. To monitor a 12V rail, connect VCC to 12V through a current-limiting resistor (e.g., 11kΩ) sized to keep VCC pin current ≤5mA. The device then regulates its own supply while monitoring VM (e.g., 12V rail directly or via divider), enabling single-chip 12V supervision without external LDOs.
LTC2918CMS-B1#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 27 Selectable Threshold Combinations
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 150ms Minimum
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP
LTC2918CMS-B1#TRPBF FAQ
1.How can I place an order for LTC2918CMS-B1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2918CMS-B1#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 LTC2918CMS-B1#TRPBF reliable?
The price and inventory of LTC2918CMS-B1#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2918CMS-B1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2918CMS-B1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2918CMS-B1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2918CMS-B1#TRPBF?
LTC2918CMS-B1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2918CMS-B1#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 LTC2918CMS-B1#TRPBF?
For technical support, including LTC2918CMS-B1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2918CMS-B1#TRPBF requirements.
6.How does Aetrix verify that LTC2918CMS-B1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2918CMS-B1#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 LTC2918CMS-B1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2918CMS-B1#TRPBF?
All LTC2918CMS-B1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2918CMS-B1#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 LTC2918CMS-B1#TRPBF part is unused and in its original packaging.
Return procedure for LTC2918CMS-B1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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