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Analog Devices Inc. LTC2918CMS-B1#PBF
- Part No.:
- LTC2918CMS-B1#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC2918CMS-B1#PBF.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:302
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Product details
Overview
LTC2918CMS-B1#PBF from Analog Devices (formerly Linear Technology) is a precision voltage supervisor IC with 9 selectable supply thresholds, fixed –5% tolerance, manual reset input (MR), and windowed watchdog timer. It operates from 1.5V to 5.5V, consumes 30μA typical 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-up sequencing and fault recovery.
For engineers reviewing the LTC2918CMS-B1#PBF datasheet, LTC2918CMS-B1#PBF pinout, LTC2918CMS-B1#PBF application, or LTC2918CMS-B1#PBF equivalent, this page provides verified functional specifications, validated pin roles, confirmed B1-series windowed watchdog behavior, exact MSOP-10 package mapping, and two field-validated alternative parts with documented technical and application differences.
Technical Context
The LTC2918CMS-B1#PBF implements a dual-timer architecture: an adjustable reset timer (RT pin) and a windowed watchdog timer (WT/WDI pins), where falling edges on WDI must occur strictly between lower (50ms) and upper (1.6s) boundaries to avoid RST assertion. Its VM input compares against nine factory-programmed thresholds selected via SEL1/SEL2 three-state logic, with fixed –5% tolerance and ±1.5% accuracy across temperature.
It features an open-drain RST output with guaranteed low-voltage operation down to VCC ≥ 0.8V, internal 100kΩ MR pull-up enabling push-button interface without external components, and integrated 6.2V shunt regulator allowing safe operation from supplies up to 12V when paired with a series resistor - all in a 10-lead MSOP package rated for industrial temperature range (–40°C to 85°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | 1.5V to 5.5V direct operation; supports up to 12V via internal 6.2V shunt regulator with external current-limiting resistor |
| Threshold Accuracy | ±1.5% over full operating temperature range (–40°C to 85°C), ensuring reliable trip point stability under thermal stress |
| Reset Timeout | 200ms internal default (RT tied to VCC); adjustable from ~400μs (RT open) to >20ms (external capacitor) |
| Watchdog Type | Windowed (B1 version): requires WDI falling edges within 50ms–1.6s interval; prevents both missed and excessive toggles |
| Quiescent Current | 30μA typical at 2.5V - enables long battery life in always-on monitoring applications |
| Manual Reset | Dedicated MR pin with internal 100kΩ pull-up to VCC - supports direct push-button interface without external components |
| Operating Temp | –40°C to +85°C (IMS grade), validated for industrial and automotive control environments |
Pinout & Package
Package: 10-Lead Plastic MSOP (3mm × 3mm), RoHS-compliant, lead-free finish (#PBF). Exposed pad optional for thermal enhancement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND | Ground reference | Primary return path for all internal circuitry and external bypass capacitors |
| MR | Manual reset input | Active-low input with internal 100kΩ pull-up; asserts RST for one reset timeout when pulled low |
| SEL2 | Threshold select bit | Three-state input (VCC/GND/open) that, with SEL1, selects one of nine nominal VM thresholds (e.g., 1.8V, 3.3V, 5V) |
| SEL1 | Threshold select bit | Three-state input (VCC/GND/open) that, with SEL2, determines monitored voltage level per Table 1 in datasheet |
| VM | Monitor input | High-impedance comparator input referenced to selected threshold; accepts ADJ mode (0.5V reference) for custom trip points |
| RST | Open-drain reset output | Asserts low when VM < threshold or MR active; held low for tRST after recovery; requires external pull-up |
| RT | Reset timeout control | Capacitor-connected pin sets tRST = 9ms/nF; tied to VCC = 200ms; open = ~400μs |
| WT | Watchdog timeout control | Capacitor-connected pin sets tWDU = 72ms/nF; tied to VCC = 1.6s; open = ~3.2ms; GND disables watchdog |
| WDI | Watchdog input | Falling-edge-triggered input; for B1 version, edges must fall within tWDL (50ms) and tWDU (1.6s) window to prevent RST |
| VCC | Power supply input | Accepts 1.5V–5.5V directly; includes internal 6.2V shunt regulator for high-voltage operation with series resistor |
Key Features
| Feature | Design Value |
|---|---|
| Windowed watchdog timer (B1 version) | Enforces strict timing window (50ms–1.6s) on WDI falling edges - eliminates false resets from software hangs or spurious toggles |
| Fixed –5% tolerance supervision | Eliminates need for TOL pin configuration; simplifies PCB layout and firmware while maintaining ±1.5% absolute threshold accuracy |
| Integrated manual reset (MR) | Internal 100kΩ pull-up enables direct push-button connection - reduces BOM count and board space vs. discrete reset buttons |
| Glitch-immune comparator | Combines 100μs minimum glitch rejection (tUV) with programmable reset timeout to suppress transients without sacrificing DC accuracy |
| 12V-compatible operation | On-chip 6.2V shunt regulator allows direct use with automotive batteries (12V) using only one series resistor - no external LDO required |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC I/O Module |
|---|---|
Use Scenario: Monitors 5V microcontroller supply during cold-crank (6V–14V battery transients) and hot-idle conditions. IC Role / Device Role / Timing Role: Voltage supervisor with windowed watchdog ensures MCU remains in valid state despite voltage sags/spikes; MR enables service-mode reset. Use Value: Prevents ECU lockup during engine start-stop cycles by enforcing strict WDI timing windows and guaranteeing reset assertion below 4.75V (5V × 0.95). |
Use Scenario: Supervises 3.3V FPGA configuration rail in distributed I/O chassis exposed to 85°C ambient. IC Role / Device Role / Timing Role: Threshold-accurate (±1.5%) monitor with 200ms reset timeout ensures FPGA reconfiguration completes before system boot proceeds. Use Value: Guarantees stable FPGA initialization under thermal stress, eliminating intermittent configuration failures observed with ±3% supervisors. |
| Medical Infusion Pump Controller | Telecom Base Station Power Management |
Use Scenario: Validates 1.8V DSP core supply in battery-backed infusion pump with safety-critical watchdog requirements. IC Role / Device Role / Timing Role: Windowed watchdog (50ms–1.6s) detects both firmware freezes and runaway loops; MR supports clinical recalibration reset. Use Value: Meets IEC 62304 Class C software safety requirements by preventing undetected processor faults through bounded watchdog timing. |
Use Scenario: Monitors 12V backplane supply feeding multiple 5V/3.3V DC-DC converters in 4G/LTE base station shelf. IC Role / Device Role / Timing Role: Uses ADJ mode with resistive divider to supervise 12V at –5% (11.4V); shunt regulator enables direct 12V connection. Use Value: Eliminates need for dedicated 5V bias rail - reduces power conversion stages and improves overall system efficiency by 2.1%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6369KA+T | Single fixed 3.08V threshold; no selectable voltages or windowed watchdog; 12μA IQ | Only suitable for fixed 3.3V monitoring; lacks MR pin and adjustable timing | Select only when design uses exactly 3.3V rail and requires ultra-low IQ; not drop-in for LTC2918CMS-B1#PBF |
| TPS3808G33DBVR | Fixed 3.3V threshold; standard (non-windowed) watchdog; 16μA IQ; SOT-23-6 package | No voltage selection, no MR, smaller footprint; watchdog lacks lower-bound enforcement | Choose for cost-sensitive 3.3V-only designs where windowed watchdog is unnecessary; requires PCB redesign due to 6-pin SOT-23 |
Compared with MAX6369KA+T and TPS3808G33DBVR, the LTC2918CMS-B1#PBF uniquely combines 9-voltage selection, windowed watchdog, manual reset, and ±1.5% accuracy in a single MSOP-10 package - making it irreplaceable for multi-rail automotive and industrial systems requiring flexible, high-reliability supervision.
Availability
LTC2918CMS-B1#PBF is available at Aetrix Electronics and suitable for automotive control systems, industrial PLCs, medical infusion pumps, and telecom base station power management requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC2918CMS-B1#PBF 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 LTC2918 belongs to Linear's precision supervisory IC product line, designed specifically for mission-critical power monitoring in automotive, industrial, and medical systems where reliability, accuracy, and watchdog robustness are non-negotiable.
FAQ
What is the function of the MR pin on the LTC2918CMS-B1#PBF?
The MR (Manual Reset) pin on the LTC2918CMS-B1#PBF is an active-low input with an internal 100kΩ pull-up to VCC. When pulled low, it forces the RST output low for one full reset timeout period (e.g., 200ms if RT is tied to VCC), then releases RST high. This enables direct push-button reset functionality without external components - a feature exclusive to the LTC2918 family and not present in the LTC2917.
Does the LTC2918CMS-B1#PBF support windowed watchdog operation?
Yes, the LTC2918CMS-B1#PBF explicitly supports windowed watchdog operation as indicated by the "B1" suffix. In this mode, the WDI input responds only to falling edges, and each edge must occur strictly between the lower boundary (50ms) and upper boundary (1.6s) relative to the prior edge; violation triggers RST assertion. This behavior is confirmed in the datasheet's Timing Diagram TD03 and Applications Information section.
What are the exact threshold voltages supported by the LTC2918CMS-B1#PBF?
The LTC2918CMS-B1#PBF supports nine nominal threshold voltages: 12V, 5V, 3.3V, 2.5V, 1.8V, 1.5V, 1.2V, 1.0V, and ADJ (0.5V reference). With its fixed –5% tolerance, actual trip points are, for example: 4.75V (5V × 0.95), 3.135V (3.3V × 0.95), and 1.71V (1.8V × 0.95), all guaranteed within ±1.5% accuracy over –40°C to 85°C.
Can the LTC2918CMS-B1#PBF operate from a 12V supply?
Yes, the LTC2918CMS-B1#PBF can operate from a 12V supply using its internal 6.2V shunt regulator. A series current-limiting resistor (e.g., 11kΩ for 12V) must be placed between the supply and the VCC pin to limit input current to ≤5mA. This eliminates the need for an external LDO and is validated in Typical Application TA03 and Applications Information section.
What is the purpose of the RT and WT pins on the LTC2918CMS-B1#PBF?
The RT (Reset Timeout) and WT (Watchdog Timeout) pins on the LTC2918CMS-B1#PBF allow adjustment of timing intervals using external capacitors: RT sets tRST ≈ 9ms/nF (e.g., 2.2nF → 20ms), while WT sets tWDU ≈ 72ms/nF (e.g., 0.047μF → 3.4s). Tying RT or WT to VCC yields fixed timeouts (200ms and 1.6s respectively); leaving them open gives minimal timeouts (~400μs and ~3.2ms).
LTC2918CMS-B1#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC2918CMS-B1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2918CMS-B1#PBF 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#PBF reliable?
The price and inventory of LTC2918CMS-B1#PBF 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#PBF is usually 5 days.
3.What payment methods are accepted for LTC2918CMS-B1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2918CMS-B1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2918CMS-B1#PBF?
LTC2918CMS-B1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2918CMS-B1#PBF 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#PBF?
For technical support, including LTC2918CMS-B1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2918CMS-B1#PBF requirements.
6.How does Aetrix verify that LTC2918CMS-B1#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2918CMS-B1#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LTC2918CMS-B1#PBF?
All LTC2918CMS-B1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2918CMS-B1#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LTC2918CMS-B1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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