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Analog Devices Inc. LTC2918IMS-B1#PBF
- Part No.:
- LTC2918IMS-B1#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC2918IMS-B1#PBF.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:453
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Product details
Overview
LTC2918IMS-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, 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 supports automotive-grade reliability up to 125°C ambient. It is used in microprocessor-based systems requiring robust power-on reset and fail-safe watchdog supervision.
For engineers reviewing the LTC2918IMS-B1#PBF datasheet, LTC2918IMS-B1#PBF pinout, LTC2918IMS-B1#PBF application, or LTC2918IMS-B1#PBF equivalent, key selection criteria include its B1 version's windowed watchdog timing (tWDL = 50ms, tWDU = 1.6s), MSOP-10 package compatibility, manual reset interface without external pull-up, and guaranteed RST assertion down to VCC ≥ 0.8V.
Technical Context
The LTC2918IMS-B1#PBF implements a dual-timer architecture: an internal 200ms reset timeout (RT = VCC) and a windowed watchdog with lower/upper boundaries (tWDL = 50ms, tWDU = 1.6s at WT = VCC). Its VM input compares against one of nine factory-programmed thresholds (12V to ADJ/0.5V) selected via SEL1/SEL2 three-state inputs; tolerance is fixed at –5%, eliminating TOL pin usage.
It features open-drain RST output with guaranteed VOL ≤ 0.2V at IRST = 15μA and VCC = 0.8V, MR input with internal 100kΩ pull-up enabling push-button reset, and glitch-immune comparator with 10μs–150μs UV detect-to-RST delay. The device includes a 6.2V shunt regulator on VCC for high-voltage operation (e.g., 12V supply with series resistor).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | 1.5V to 5.5V direct operation; 6.2V shunt regulator enables use with 12V supplies via series resistor |
| Threshold Accuracy | ±1.5% over full temperature range (–40°C to +85°C), ensuring reliable trip point outside system supply tolerance bands |
| Quiescent Current | 30μA typical - enables long battery life in always-on monitoring applications |
| Reset Timeout | 200ms fixed (RT tied to VCC); adjustable from 16ms to 25ms with 2.2nF capacitor on RT pin |
| Watchdog Timing | Windowed mode: 50ms lower boundary (tWDL), 1.6s upper boundary (tWDU) when WT = VCC - prevents spurious resets and detects stuck/frozen firmware |
| RST Output | Open-drain, guaranteed low to 0.05V at 15μA and VCC = 0.8V - ensures valid logic-low assertion even during brown-out |
| Manual Reset | MR pin with internal 100kΩ pull-up to VCC - supports direct push-button interface without external components |
Pinout & Package
Package: 10-Lead MSOP (3mm × 3mm), RoHS-compliant, rated for –40°C to +85°C operating temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND | Ground reference | Primary return path for all internal circuits and RST pull-down; must be low-impedance connection |
| MR | Manual reset input | Active-low input with internal 100kΩ pull-up; asserts RST low for full reset timeout when pulled to GND |
| SEL2 | Threshold select bit 1 | Three-state input (VCC/GND/open) selecting nominal VM threshold per Table 1; determines 12V, 3.3V, 1.5V, etc. |
| SEL1 | Threshold select bit 0 | Three-state input (VCC/GND/open) completing 9-threshold selection; open/open = 1.8V nominal |
| VM | Monitored supply input | High-impedance comparator input; compared against selected threshold; supports ADJ mode (0.5V reference) |
| RST | Reset output | Open-drain output requiring external pull-up; asserts low during undervoltage or watchdog fault; releases after timeout |
| RT | Reset timeout control | Capacitor-adjustable timer pin; tie to VCC for 200ms timeout; open for ~400μs; capacitor sets 9ms/nF scaling |
| WT | Watchdog timer control | Capacitor-adjustable windowed watchdog pin; tie to VCC for 1.6s upper bound; open for ~3.2ms; disables when grounded |
| WDI | Watchdog input | Falling-edge-triggered input; must toggle within tWDL–tWDU window (50ms–1.6s) to prevent RST assertion |
| VCC | Power supply input | 1.5V–5.5V primary supply; includes 6.2V shunt regulator for >5.7V operation; bypass with 0.1μF ceramic capacitor |
Key Features
| Feature | Design Value |
|---|---|
| Windowed watchdog (B1 version) | Enforces both minimum and maximum WDI toggle period (50ms–1.6s), detecting frozen or excessively fast firmware execution |
| Manual reset with internal pull-up | Eliminates external resistor for push-button reset, reducing BOM count and PCB footprint in space-constrained designs |
| Guaranteed RST at low VCC | Asserts valid reset signal even when VCC drops to 0.8V - critical for brown-out detection in automotive and industrial systems |
| 9-pin-selectable thresholds | Supports 12V, 5V, 3.3V, 2.5V, 1.8V, 1.5V, 1.2V, 1.0V, and ADJ (0.5V) without external resistors - simplifies multi-rail monitoring |
| ±1.5% threshold accuracy over temp | Ensures trip point remains outside system supply tolerance band (e.g., 5V ±10%) across –40°C to +85°C, preventing nuisance resets |
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. IC Role / Device Role / Timing Role: Voltage supervisor with windowed watchdog ensures MCU reset on undervoltage or firmware hang; MR enables service-mode reset. Use Value: ±1.5% threshold accuracy prevents false resets during cold cranking; 1.6s watchdog upper bound aligns with safety-critical task cycle times. |
Use Scenario: Supervises 3.3V FPGA configuration supply in modular PLC backplane with hot-swap capability. IC Role / Device Role / Timing Role: Provides power-on reset and continuous watchdog supervision; RST open-drain allows wired-OR with other supervisors. Use Value: 30μA quiescent current minimizes standby power; 200ms fixed reset timeout meets FPGA configuration timing requirements. |
| Medical Infusion Pump Controller | Telecom Base Station Power Management |
Use Scenario: Ensures safe startup and runtime integrity of ARM Cortex-M4 core powered by 1.8V LDO in battery-operated infusion pump. IC Role / Device Role / Timing Role: Monitors 1.8V rail using SEL1/SEL2 = open/open; uses MR for clinician-initiated recalibration reset. Use Value: Guaranteed RST at VCC ≥ 0.8V enables reset during deep battery discharge; windowed watchdog detects motor driver lockup. |
Use Scenario: Supervises 12V intermediate bus feeding multiple DC/DC converters in 5G base station RF unit. IC Role / Device Role / Timing Role: Uses VCC shunt regulator to operate directly from 12V; VM monitors 12V rail with 12V threshold and –5% tolerance. Use Value: 6.2V shunt regulator eliminates need for auxiliary bias supply; ±1.5% accuracy ensures compliance with GR-63-CORE hold-up time specs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor with watchdog applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6361KA29+T | Fixed 2.93V threshold; no selectable voltages or windowed watchdog; 1.2μA quiescent current | Suitable only for single-rail 2.93V monitoring; lacks manual reset and adjustable timing | Select when ultra-low power and fixed threshold suffice; not suitable for multi-supply or safety-critical watchdog needs |
| TPS3808G33DBVR | Fixed 3.3V threshold; standard (non-windowed) watchdog; 16μA quiescent current; SOT-23-6 package | Smaller footprint but no manual reset or voltage select; less accurate (±2.5% threshold) | Choose for cost-sensitive, space-constrained 3.3V-only designs where windowed watchdog is unnecessary |
Compared with MAX6361KA29+T and TPS3808G33DBVR, the LTC2918IMS-B1#PBF provides unique flexibility in threshold selection, mandatory windowed watchdog for functional safety, and integrated manual reset-making it optimal for complex, multi-rail, high-reliability embedded systems.
Availability
LTC2918IMS-B1#PBF is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC modules, medical infusion pump controllers, telecom base station power management, and network server supervisory circuits requiring stable component supply and long-term lifecycle support.
Supply support for LTC2918IMS-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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC2918 belongs to ADI's precision power monitoring product line, designed specifically for mission-critical embedded systems demanding guaranteed reset behavior, robust watchdog supervision, and operation across extended temperature ranges.
FAQ
What does the "B1" suffix indicate in LTC2918IMS-B1#PBF?
The "B1" suffix identifies the windowed watchdog variant of the LTC2918 with fixed –5% tolerance and internal 200ms reset timeout. It specifies the functional configuration (B = windowed watchdog, 1 = RT = VCC default), not temperature grade - this part is rated for –40°C to +85°C (I-grade).
Can LTC2918IMS-B1#PBF monitor a 12V supply directly?
Yes - LTC2918IMS-B1#PBF includes a 6.2V shunt regulator on the VCC pin. To monitor 12V, connect it to VCC through a series current-limiting resistor (e.g., 11kΩ for 12V automotive), set SEL1/SEL2 to VCC/VCC for 12V threshold, and route the 12V rail to VM. No external regulator is needed.
How does the manual reset (MR) pin function on LTC2918IMS-B1#PBF?
The MR pin on LTC2918IMS-B1#PBF is active-low with an internal 100kΩ pull-up to VCC. Pulling MR to GND asserts RST low for the full reset timeout period (e.g., 200ms), then releases RST high. It requires no external components and supports momentary push-button interfaces directly.
What is the difference between LTC2918-A and LTC2918-B versions?
LTC2918-A implements a standard watchdog (only upper timeout boundary), while LTC2918-B (including LTC2918IMS-B1#PBF) adds a lower boundary (tWDL), creating a timing window. WDI falling edges must occur strictly between tWDL and tWDU - preventing both missed toggles and excessive frequency, enhancing reliability.
Does LTC2918IMS-B1#PBF require external components for basic operation?
No - LTC2918IMS-B1#PBF operates with zero external components for core functions: set SEL1/SEL2 for threshold, tie RT to VCC for 200ms reset, tie WT to VCC for 1.6s watchdog, and connect MR to push button. Only VM bypass (0.1μF) and RST pull-up (if not wired-OR) are recommended for robustness.
LTC2918IMS-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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP
LTC2918IMS-B1#PBF FAQ
1.How can I place an order for LTC2918IMS-B1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2918IMS-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 LTC2918IMS-B1#PBF reliable?
The price and inventory of LTC2918IMS-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 LTC2918IMS-B1#PBF is usually 5 days.
3.What payment methods are accepted for LTC2918IMS-B1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2918IMS-B1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2918IMS-B1#PBF?
LTC2918IMS-B1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2918IMS-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 LTC2918IMS-B1#PBF?
For technical support, including LTC2918IMS-B1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2918IMS-B1#PBF requirements.
6.How does Aetrix verify that LTC2918IMS-B1#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2918IMS-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 LTC2918IMS-B1#PBF meets industry standards.
7.What is the process for return or replacement of LTC2918IMS-B1#PBF?
All LTC2918IMS-B1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2918IMS-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 LTC2918IMS-B1#PBF part is unused and in its original packaging.
Return procedure for LTC2918IMS-B1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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