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Analog Devices Inc. LTC2918HMS-B1#PBF
- Part No.:
- LTC2918HMS-B1#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC2918HMS-B1#PBF.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,999
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Product details
Overview
LTC2918HMS-B1#PBF from Analog Devices (formerly Linear Technology) is a high-temperature 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 supply, consumes 30μA typical quiescent current, guarantees ±1.5% threshold accuracy over –40°C to 125°C, and delivers 200ms internal reset timeout - used in automotive engine control units for reliable power-on reset and microcontroller supervision.
For engineers reviewing the LTC2918HMS-B1#PBF datasheet, LTC2918HMS-B1#PBF pinout, LTC2918HMS-B1#PBF application, or LTC2918HMS-B1#PBF equivalent, key selection criteria include its B1 version's windowed watchdog (tWDL = 50ms / tWDU = 1.6s), MR pin compatibility with push-button interfaces, guaranteed RST assertion down to VCC ≥ 0.8V, and MSOP-10 package suitability for space-constrained under-hood designs.
Technical Context
The LTC2918HMS-B1#PBF implements a dual-stage supervision architecture: a precision comparator monitors VM against one of nine internally programmed thresholds selected via SEL1/SEL2 three-state inputs, while a dedicated windowed watchdog logic block validates WDI falling-edge timing between lower (50ms) and upper (1.6s) boundaries. Its fixed –5% tolerance eliminates TOL pin usage versus LTC2917, simplifying configuration.
Reset timing is controlled by RT pin state (open = ~400μs, tied to VCC = ~200ms, or capacitor-adjustable), and watchdog timing by WT pin state (open = ~3.2ms, tied to VCC = ~1.6s, or capacitor-adjustable). The MR input features an internal 100kΩ pull-up, enabling direct push-button connection without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | 1.5V to 5.5V - supports direct connection to common logic rails; shunt regulation enables operation up to 12V with series resistor. |
| Threshold Accuracy | ±1.5% over –40°C to 125°C - ensures reliable trip point margining against supply tolerances (e.g., 5V ±10%) without nuisance resets. |
| Quiescent Current | 30μA typical - enables long-term battery-backed monitoring in always-on automotive subsystems. |
| Internal Reset Timeout | 200ms when RT = VCC - provides sufficient hold time for microcontroller initialization before release. |
| Windowed Watchdog | tWDL = 50ms / tWDU = 1.6s (B1 version) - detects both stuck and excessively fast WDI toggling, critical for ASIL-B safety-critical firmware validation. |
| Manual Reset Input | MR active-low with 100kΩ internal pull-up - allows direct momentary switch interface; no external components required. |
| Operating Temperature | –40°C to 125°C (H-grade) - qualified for under-hood automotive applications per AEC-Q100 requirements. |
Pinout & Package
Package: 10-Lead MSOP (3mm × 3mm), RoHS-compliant, lead-free finish. Exposed pad optional for thermal enhancement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND | Ground reference | Primary return path for all internal circuits; must be low-impedance connection to system ground plane. |
| MR | Manual reset input | Active-low signal; internal 100kΩ pull-up enables direct push-button tie to GND; asserts RST for full reset timeout. |
| SEL2 | Threshold select input | Three-state (VCC/GND/open); selects nominal VM threshold with SEL1 per Table 1 (e.g., SEL2=GND + SEL1=VCC → 3.3V). |
| SEL1 | Threshold select input | Three-state (VCC/GND/open); pairs with SEL2 to configure one of nine preset thresholds including ADJ (0.5V). |
| VM | Monitor input | High-impedance comparator input; compares against selected threshold; supports external resistive divider for adjustable trip points. |
| RST | Open-drain reset output | Asserts low during fault or reset timeout; requires external pull-up; supports wired-OR with other supervisors. |
| RT | Reset timeout control | Configures internal reset duration: open (~400μs), VCC (~200ms), or capacitor-adjustable (9ms/nF). |
| WT | Watchdog timeout control | Configures windowed watchdog period: open (~3.2ms), VCC (~1.6s), or capacitor-adjustable (72ms/nF). |
| WDI | Watchdog input | Falling-edge sensitive only (B1 version); must toggle within 50ms–1.6s window to prevent RST assertion. |
| VCC | Power supply input | Accepts 1.5V–5.5V directly; includes 6.2V shunt regulator for >5.7V operation with series current-limiting resistor. |
Key Features
| Feature | Design Value |
|---|---|
| 9 Selectable Thresholds | Internally programmed 12V/5V/3.3V/2.5V/1.8V/1.5V/1.2V/1.0V/ADJ (0.5V) - eliminates external resistor networks and reduces BOM count. |
| Windowed Watchdog (B1) | Enforces strict timing window (50ms–1.6s) on WDI falling edges - prevents false resets from runaway or frozen firmware states. |
| Manual Reset with Internal Pull-Up | 100kΩ internal MR pull-up - enables single-switch reset interface without discrete resistors, saving PCB area and assembly cost. |
| Guaranteed RST at Low VCC | RST asserted for VCC ≥ 0.8V - ensures valid reset generation even during brown-out conditions before core logic powers up. |
| Glitch Immunity | Combined anti-glitch circuitry and reset timeout - rejects transients <10μs at 5% over-threshold, preventing spurious resets near trip points. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC I/O Module |
|---|---|
Use Scenario: Monitors 5V microcontroller supply in under-hood ECU exposed to –40°C to 125°C ambient and load dump transients. IC Role / Device Role / Timing Role: Voltage supervisor with windowed watchdog ensures MCU reset on undervoltage and validates firmware liveness via WDI edge timing. Use Value: Prevents undefined MCU behavior during cold cranking or thermal stress; ±1.5% threshold accuracy avoids nuisance resets across full temperature range. |
Use Scenario: Supervises 3.3V FPGA configuration rail in modular industrial controller with field-serviceable hot-swap capability. IC Role / Device Role / Timing Role: Provides power-on reset and manual reset via front-panel button; uses ADJ mode to monitor custom 2.8V auxiliary supply. Use Value: MR pin eliminates need for external pull-up; 30μA quiescent current minimizes standby power in always-on modules. |
| Telecom Base Station Power Shelf | Medical Infusion Pump Controller |
Use Scenario: Validates 12V backplane supply in redundant telecom power shelf where continuous uptime is critical. IC Role / Device Role / Timing Role: Configured as 12V supervisor with 10% tolerance; uses shunt regulator to operate directly from 12V rail without LDO. Use Value: Eliminates external regulator; 6.2V shunt enables robust 12V operation with simple series resistor, reducing component count and failure modes. |
Use Scenario: Supervises 1.8V ARM Cortex-M4 core supply in battery-powered infusion pump requiring FDA Class II compliance. IC Role / Device Role / Timing Role: Generates 200ms reset pulse on power-up and validates firmware execution via windowed watchdog with 50ms–1.6s window. Use Value: B1 version's dual-boundary watchdog meets IEC 62304 SW safety requirements for life-critical embedded software monitoring. |
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 watchdog; SOT23-3 package; 1.1V to 5.5V supply. | Only suitable for single-rail monitoring; lacks manual reset, windowed watchdog, and multi-threshold flexibility. | Select only when supervising one fixed rail with minimal footprint and no firmware supervision needed. |
| TPS3808G18DBVR | Fixed 1.8V threshold, adjustable watchdog (non-windowed), no manual reset; SOT23-6 package; 0.8V to 6.0V supply. | Supports wider supply range but cannot monitor 5V/12V rails natively; lacks MR pin and precise 125°C operation. | Choose for cost-sensitive 1.8V-only applications where windowed watchdog is not required and extended temperature is not critical. |
Compared with MAX6326US29D3+T and TPS3808G18DBVR, the LTC2918HMS-B1#PBF offers unique configurability (9 thresholds, MR, windowed watchdog) and guaranteed performance at 125°C - making it irreplaceable for multi-rail, safety-critical, high-temperature automotive and industrial systems.
Availability
LTC2918HMS-B1#PBF is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC I/O modules, telecom power shelves, and medical infusion pump controllers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC2918HMS-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 (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving aerospace, automotive, industrial, and communications markets.
The LTC2918 belongs to Linear's precision voltage supervisor product line, designed specifically for high-reliability applications demanding accurate threshold detection, robust glitch immunity, and advanced watchdog functionality in harsh environments.
FAQ
What is the function of the MR pin on the LTC2918HMS-B1#PBF?
The MR (Manual Reset) pin on the LTC2918HMS-B1#PBF 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 if RT = VCC), then releases it. This enables direct push-button reset interfacing without external components - a feature exclusive to the LTC2918 family and not present in LTC2917 variants.
How does the windowed watchdog differ between LTC2918HMS-B1#PBF and LTC2918HMS-A1#PBF?
The LTC2918HMS-B1#PBF implements a true windowed watchdog requiring WDI falling edges to occur strictly between tWDL = 50ms and tWDU = 1.6s; violation in either direction triggers RST. In contrast, the A1 version only enforces the upper boundary (tWDU ≈ 1.6s) and ignores lower-bound violations. This makes the B1 version mandatory for ASIL-B or IEC 62304-compliant firmware supervision where both stuck and runaway states must be detected.
Can the LTC2918HMS-B1#PBF monitor a 12V supply directly?
Yes - the LTC2918HMS-B1#PBF includes an internal 6.2V shunt regulator on the VCC pin. To monitor a 12V supply, connect it to VCC through a series current-limiting resistor (e.g., 11kΩ for 12V automotive rail), ensuring VCC pin current stays ≤5mA. The device then regulates its own supply while using SEL1/SEL2 to configure VM for 12V threshold detection with ±5% tolerance.
What is the minimum VCC voltage required for valid RST assertion on the LTC2918HMS-B1#PBF?
The LTC2918HMS-B1#PBF guarantees RST assertion for VCC ≥ 0.8V, independent of VM level. This ensures reliable reset generation during brown-out conditions before the monitored supply (VM) or core logic reaches operational voltage - a critical feature for fail-safe startup sequencing in automotive and industrial systems.
Does the LTC2918HMS-B1#PBF support adjustable reset timeout using an external capacitor?
Yes - the RT pin supports capacitor-based reset timeout adjustment. Connecting CRT from RT to GND sets tRST ≈ 9ms/nF (e.g., 2.2nF yields ~20ms). Alternatively, RT can be left open (~400μs) or tied to VCC (~200ms). This flexibility allows precise matching to microcontroller boot time requirements without changing firmware or layout.
LTC2918HMS-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:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP
LTC2918HMS-B1#PBF FAQ
1.How can I place an order for LTC2918HMS-B1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2918HMS-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 LTC2918HMS-B1#PBF reliable?
The price and inventory of LTC2918HMS-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 LTC2918HMS-B1#PBF is usually 5 days.
3.What payment methods are accepted for LTC2918HMS-B1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2918HMS-B1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2918HMS-B1#PBF?
LTC2918HMS-B1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2918HMS-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 LTC2918HMS-B1#PBF?
For technical support, including LTC2918HMS-B1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2918HMS-B1#PBF requirements.
6.How does Aetrix verify that LTC2918HMS-B1#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2918HMS-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 LTC2918HMS-B1#PBF meets industry standards.
7.What is the process for return or replacement of LTC2918HMS-B1#PBF?
All LTC2918HMS-B1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2918HMS-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 LTC2918HMS-B1#PBF part is unused and in its original packaging.
Return procedure for LTC2918HMS-B1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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