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Analog Devices Inc. LTC2918IMS-A1#PBF
- Part No.:
- LTC2918IMS-A1#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC2918IMS-A1#PBF.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 10MSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LTC2918IMS-A1#PBF 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 integrated 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-up sequencing and fault recovery.
For engineers reviewing the LTC2918IMS-A1#PBF datasheet, LTC2918IMS-A1#PBF pinout, LTC2918IMS-A1#PBF application, or LTC2918IMS-A1#PBF equivalent, key selection criteria include its MSOP-10 package, MR pin support for push-button reset, windowed watchdog capability (A1 variant uses standard watchdog), VM input impedance >0.5MΩ, and guaranteed RST assertion down to VCC ≥ 0.8V.
Technical Context
The LTC2918IMS-A1#PBF implements a dual-timer architecture: an internal 200ms reset timeout (RT = VCC) and a configurable watchdog timer (WT = VCC yields 1.6s upper boundary). Its voltage monitor compares VM against one of nine factory-programmed thresholds selected via SEL1/SEL2 three-state inputs, with fixed –5% tolerance enforced by internal reference scaling.
It features open-drain RST output with VOL ≤ 0.2V at 15μA (VCC = 0.8V), glitch-immune comparator with 10–150μs detection delay, and 6.2V shunt regulator on VCC enabling operation up to 12V supplies when paired with a series resistor. The MR input includes 100kΩ internal pull-up and accepts logic-level signals referenced to VCC.
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 series resistor |
| Threshold Accuracy | ±1.5% over full temperature range (–40°C to 85°C), ensuring reliable trip point margining against supply tolerances |
| Quiescent Current | 30μA typical - enables use in always-on automotive subsystems without significant battery drain |
| Reset Timeout | 200ms internal (RT tied to VCC); eliminates need for external timing capacitor in basic applications |
| Watchdog Upper Boundary | 1.6s internal (WT tied to VCC); provides fail-safe microprocessor supervision without external components |
| RST Output Type | Open-drain with guaranteed low-voltage drive (VOL ≤ 0.2V at 15μA, VCC = 0.8V) for compatibility with 1.8V/3.3V logic |
| VM Input Impedance | 0.5–8MΩ depending on SEL configuration - minimizes loading on monitored rail and supports high-resistance divider networks |
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; must be low-impedance connection to system ground plane |
| MR | Manual Reset Input | Active-low input with 100kΩ internal pull-up to VCC; directly interfaces with momentary pushbutton without external components |
| SEL2 | Threshold Selection Input | Three-state (VCC/GND/Open) control pin selecting nominal VM threshold per Table 1; leakage < ±5μA in open state |
| SEL1 | Threshold Selection Input | Three-state control pin paired with SEL2 to select one of nine voltage thresholds (12V to ADJ); defines trip point without external resistors |
| VM | Monitor Input | High-impedance comparator input; monitors supply voltage against selected threshold; supports adjustable mode (0.5V reference) |
| RST | Reset Output | Open-drain output asserting low during undervoltage or reset timeout; requires external pull-up to host logic rail |
| RT | Reset Timeout Control | Configures reset duration: open = ~400μs, VCC = ~200ms, capacitor to GND = 9ms/nF (e.g., 2.2nF → 20ms) |
| WT | Watchdog Timeout Control | Configures watchdog upper boundary: open = ~3.2ms, VCC = ~1.6s, capacitor to GND = 72ms/nF |
| WDI | Watchdog Input | Edge-triggered input requiring toggling within watchdog timeout; falling edges only monitored in B versions (A1 uses standard watchdog) |
| VCC | Power Supply Input | Accepts 1.5–5.5V directly; includes internal 6.2V shunt regulator for >5.7V operation with current-limiting resistor |
Key Features
| Feature | Design Value |
|---|---|
| 9-Select Threshold Architecture | Eliminates external resistor networks for common rails (12V/5V/3.3V/2.5V/1.8V/1.5V/1.2V/1.0V/ADJ), reducing BOM count and layout complexity |
| Integrated Manual Reset (MR) | Enables field-serviceable system recovery via pushbutton without MCU involvement or additional logic |
| Glitch-Immune Comparator | Rejects transients <10μs duration near threshold, preventing false resets during load switching or EMI events |
| Guaranteed Operation at 0.8V VCC | Ensures valid reset assertion during brown-out conditions where other supervisors may fail silently |
| Windowed Watchdog Support (B variants) | Not applicable to LTC2918IMS-A1#PBF - this A1 version implements standard watchdog (upper-bound only), simplifying firmware integration |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC I/O Module |
|---|---|
Use Scenario: Monitors 5V microcontroller supply during cold-cranking when battery dips to 6V. IC Role / Device Role / Timing Role: Voltage supervisor asserting RST until 5V rail stabilizes above 4.75V (5V–5%) and holds for 200ms. Use Value: Prevents MCU lockup during engine start by guaranteeing clean reset after VCC reaches 0.8V and VM exceeds threshold. |
Use Scenario: Supervises 3.3V FPGA configuration voltage in harsh industrial environments. IC Role / Device Role / Timing Role: Detects undervoltage on 3.3V rail and asserts open-drain RST to hold FPGA in reset until stable. Use Value: Leverages ±1.5% threshold accuracy to avoid nuisance resets caused by 3.3V±5% supply tolerance. |
| Medical Infusion Pump Controller | Telecom Base Station Power Management |
Use Scenario: Validates 1.8V DSP core supply before enabling motor drivers. IC Role / Device Role / Timing Role: Uses ADJ mode with external resistor divider to set precise 1.8V±5% trip point on VM pin. Use Value: Enables safe power sequencing by holding RST low until 1.8V rail settles within spec and remains stable for 200ms. |
Use Scenario: Provides watchdog supervision for ARM-based management processor in 48V-powered base station. IC Role / Device Role / Timing Role: WDI toggled by firmware heartbeat; 1.6s internal watchdog timeout triggers RST if CPU hangs. Use Value: Delivers fail-safe recovery without external timing components, reducing component count and board area. |
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 manual reset; SOT23-3 package | Suitable only for single-rail monitoring; lacks flexibility for multi-supply systems | Select when cost-sensitive designs require minimal footprint and only one fixed threshold is needed |
| TPS3808G33DBVR | Adjustable threshold via external resistor divider; 3.3V fixed option; no MR pin; 6-pin SOT23 | Requires external resistors for threshold setting; no pushbutton reset interface | Choose when design requires fine-grained threshold tuning but can omit manual reset functionality |
Compared with MAX6326US29D3+T and TPS3808G33DBVR, the LTC2918IMS-A1#PBF offers superior flexibility through 9 factory-set thresholds, integrated MR pin, and zero-component watchdog/reset timing - making it optimal for complex multi-rail automotive and industrial systems where reliability and configurability are critical.
Availability
LTC2918IMS-A1#PBF is available at Aetrix Electronics and suitable for automotive control units, 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 LTC2918IMS-A1#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 semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC2918IMS-A1#PBF belongs to Linear's precision supervisor product line, designed specifically for mission-critical power monitoring in automotive and industrial environments where guaranteed reset behavior, wide temperature operation, and low quiescent current are mandatory.
FAQ
What is the operating temperature range for the LTC2918IMS-A1#PBF?
The LTC2918IMS-A1#PBF is specified for operation from –40°C to +85°C (Industrial grade), validated across this range for threshold accuracy, reset timing, and watchdog performance. Its MSOP-10 package supports thermal dissipation up to 125°C junction temperature, enabling robust deployment in under-hood automotive modules and industrial enclosures.
Does the LTC2918IMS-A1#PBF support windowed watchdog functionality?
No - the LTC2918IMS-A1#PBF is an "A" version device and implements standard watchdog behavior (upper-bound timeout only). Windowed watchdog (requiring both upper and lower boundaries) is exclusive to "B" versions like LTC2918IMS-B1#PBF. The A1 variant simplifies firmware integration by requiring only periodic WDI toggling within the 1.6s timeout.
How does the manual reset (MR) pin function on the LTC2918IMS-A1#PBF?
The MR pin on the LTC2918IMS-A1#PBF is an active-low input with a 100kΩ internal pull-up to VCC, allowing direct connection to a momentary pushbutton grounded on the other side. Asserting MR low while RST is high initiates a full reset cycle: RST goes low for the configured timeout (e.g., 200ms), then releases. No external components are required for basic pushbutton operation.
Can the LTC2918IMS-A1#PBF monitor a 12V supply directly?
Yes - the LTC2918IMS-A1#PBF incorporates a 6.2V shunt regulator on the VCC pin. To monitor 12V, connect it to VCC through a current-limiting resistor (e.g., 11kΩ for 12V automotive), ensuring VCC pin current stays ≤5mA. The internal regulator clamps VCC to ~6.2V, enabling safe operation while VM monitors the 12V rail via appropriate resistor divider.
What is the minimum supply voltage required for the LTC2918IMS-A1#PBF to assert a valid reset?
The LTC2918IMS-A1#PBF guarantees RST assertion for VCC ≥ 0.8V, independent of VM level. This ensures fail-safe reset generation even during deep brown-out conditions where other supervisors may cease functioning. Below 0.8V, device operation is undefined; above 1.5V, full specification compliance (including threshold accuracy) is guaranteed.
LTC2918IMS-A1#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-A1#PBF FAQ
1.How can I place an order for LTC2918IMS-A1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2918IMS-A1#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-A1#PBF reliable?
The price and inventory of LTC2918IMS-A1#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-A1#PBF is usually 5 days.
3.What payment methods are accepted for LTC2918IMS-A1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2918IMS-A1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2918IMS-A1#PBF?
LTC2918IMS-A1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2918IMS-A1#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-A1#PBF?
For technical support, including LTC2918IMS-A1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2918IMS-A1#PBF requirements.
6.How does Aetrix verify that LTC2918IMS-A1#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2918IMS-A1#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-A1#PBF meets industry standards.
7.What is the process for return or replacement of LTC2918IMS-A1#PBF?
All LTC2918IMS-A1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2918IMS-A1#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-A1#PBF part is unused and in its original packaging.
Return procedure for LTC2918IMS-A1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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