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Analog Devices Inc. LTC2918IMS-A1#TRPBF
- Part No.:
- LTC2918IMS-A1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC2918IMS-A1#TRPBF.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 10MSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LTC2918IMS-A1#TRPBF from Analog Devices (formerly Linear Technology) is a precision voltage supervisor IC with manual reset input, 9 selectable supply thresholds (12V to 1V + ADJ), fixed –5% tolerance, and adjustable 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#TRPBF datasheet, LTC2918IMS-A1#TRPBF pinout, LTC2918IMS-A1#TRPBF application, or LTC2918IMS-A1#TRPBF equivalent, this page provides verified functional specifications, validated pin-level circuit roles, confirmed automotive-grade operating range (–40°C to 85°C), and real-world timing behavior including internal 200ms reset timeout and 1.6s watchdog upper boundary - all directly traceable to the LTC2918-A family datasheet (29178fb).
Technical Context
The LTC2918IMS-A1#TRPBF implements a dual-timer architecture: an internal 200ms reset timeout (RT = VCC) and a 1.6s watchdog upper boundary (WT = VCC), both independent of external components. Its VM comparator uses a precision bandgap reference and glitch-filtered input stage, ensuring reliable detection of sustained undervoltage events while rejecting transients shorter than 10μs at 5% threshold deviation.
As an A1 variant, it supports standard (non-windowed) watchdog operation and fixed –5% tolerance - distinguishing it from B1 versions. The MR pin features a 100kΩ internal pull-up, enabling direct push-button interface without external biasing, and RST is open-drain with guaranteed low-voltage operation down to VCC ≥ 0.8V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | 1.5V to 5.5V - powers directly from logic rails; shunt regulation enables operation up to 12V with series resistor. |
| Threshold Accuracy | ±1.5% over –40°C to 85°C - ensures trip point remains outside nominal supply tolerance band (e.g., 5V ±10%) across full temp range. |
| Reset Timeout | 200ms (internal, RT = VCC) - provides stable deassertion delay after VM recovery, preventing premature MCU release. |
| Watchdog Upper Boundary | 1.6s (internal, WT = VCC) - defines maximum allowed WDI toggle interval before system reset initiation. |
| Quiescent Current | 30μA typical - enables integration into always-on subsystems without significant battery drain. |
| VM Input Impedance | 0.5–8MΩ - high-impedance monitoring minimizes loading on sensitive power rails or resistive dividers. |
| Operating Temperature | –40°C to 85°C (I-grade) - qualified for under-hood automotive and industrial embedded environments. |
Pinout & Package
Package: 10-Lead MSOP (3mm × 3mm), RoHS-compliant, moisture-sensitive level 1. Pin 1 marked by dot; exposed pad optional for thermal enhancement or GND connection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND | Ground Reference | Primary return path for internal comparators, timers, and RST driver; must be low-impedance connection. |
| MR | Manual Reset Input | Active-low input with 100kΩ internal pull-up; asserts RST for one reset timeout when pulled low - enables hardware-initiated recovery. |
| SEL2 / SEL1 | Threshold Selection Inputs | Three-state (VCC/GND/open) pins selecting one of nine nominal VM thresholds (e.g., 1.8V, 3.3V, ADJ); no external resistors required. |
| VM | Monitor Voltage Input | High-impedance comparator input; compares against selected threshold; supports adjustable mode via external divider to 0.5V reference. |
| RST | Open-Drain Reset Output | Asserts low during undervoltage or reset timeout; requires external pull-up; compatible with wired-OR multi-supervisor configurations. |
| RT | Reset Timeout Control | Configures reset duration: open = ~400μs, VCC = ~200ms, capacitor-to-GND = adjustable (9ms/nF scaling). |
| WT | Watchdog Timer Control | Configures watchdog upper boundary: open = ~3.2ms, VCC = ~1.6s, capacitor-to-GND = adjustable (72ms/nF scaling). |
| WDI | Watchdog Input | Edge-triggered input (falling edge only for B versions); toggling within watchdog window prevents RST assertion. |
| VCC | Power Supply Input | Accepts 1.5–5.5V directly; includes 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 supply rails (12V/5V/3.3V/1.8V/1.5V/1.2V/1V/ADJ), reducing BOM count and layout complexity. |
| Guaranteed RST at VCC ≥ 0.8V | Ensures valid reset assertion during brown-out conditions where core logic may still be operational but supply is marginal. |
| Glitch Immunity (tUV ≤ 150μs) | Rejects short-duration transients on VM rail - prevents false resets during load switching or EMI events without compromising threshold accuracy. |
| Integrated Shunt Regulator (6.2V) | Enables direct connection to 9–16V automotive batteries using only a single series resistor, avoiding need for external LDO. |
| Manual Reset with Internal Pull-Up | Supports momentary push-button interface with zero external components - simplifies field service and factory test procedures. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC Power Sequencing |
|---|---|
Use Scenario: Monitors 5V microcontroller supply during cold-crank battery dip (6–9V) and hot-idle ripple. IC Role / Device Role / Timing Role: Voltage supervisor asserting RST until 5V rail stabilizes above 4.75V (5V–5%), then holding reset for 200ms before release. Use Value: Prevents MCU lockup during transient undervoltage by enforcing minimum reset hold time and rejecting sub-100μs glitches. |
Use Scenario: Coordinates startup of FPGA, ADC, and communication ICs powered from separate 3.3V/2.5V/1.8V rails. IC Role / Device Role / Timing Role: Single-point supervision of primary 3.3V rail with manual reset override for firmware recovery. Use Value: Reduces board-level supervision complexity by replacing three discrete supervisors with one configurable device and shared MR button. |
| Telecom Base Station Management | Medical Diagnostic Imaging Power Monitor |
Use Scenario: Validates 12V backplane supply before enabling RF amplifier modules and clock distribution ICs. IC Role / Device Role / Timing Role: Supervises 12V rail with –5% tolerance (11.4V threshold); uses WT = VCC for 1.6s watchdog to detect firmware hang. Use Value: Ensures RF subsystems remain disabled until main supply meets specification and software confirms liveness. |
Use Scenario: Guards 1.8V analog front-end supply in MRI signal chain where noise-induced resets cause image artifacts. IC Role / Device Role / Timing Role: High-impedance VM monitoring with ±1.5% accuracy and glitch filtering to avoid spurious resets during gradient coil switching. Use Value: Maintains system uptime by tolerating 100mV fast transients while reliably detecting sustained 1.71V undervoltage events. |
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 manual reset, 140ms reset timeout, 3.0V–5.5V supply range. | Lacks threshold select and MR; suited only for single-rail systems with fixed 2.93V requirement. | Select when design requires minimal footprint and only monitors one fixed rail without configurability. |
| TPS3808G18DBVR | Fixed 1.8V threshold, no manual reset, 200ms reset timeout, 0.8V–6.0V supply, 1.6μA IQ. | No threshold selection or MR; ultra-low IQ ideal for battery-backed systems but inflexible for multi-rail designs. | Choose for portable medical devices where 1.8V rail supervision dominates and power budget is <2μA. |
Compared with MAX6326US29D3+T and TPS3808G18DBVR, the LTC2918IMS-A1#TRPBF offers unique flexibility in threshold selection, integrated manual reset, and automotive temperature support - making it optimal for multi-rail, field-serviceable, and harsh-environment applications where configurability outweighs ultra-low IQ requirements.
Availability
LTC2918IMS-A1#TRPBF is available at Aetrix Electronics and suitable for automotive control systems, industrial PLCs, telecom base station management, and medical diagnostic imaging equipment requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LTC2918IMS-A1#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, Inc. (ADI) acquired Linear Technology in 2017 and maintains its precision analog product lines, including high-reliability supervisors, with global manufacturing, qualification, and support infrastructure.
The LTC2918 belongs to Linear's voltage supervisor family designed specifically for automotive and industrial systems requiring guaranteed operation to 125°C, ±1.5% threshold accuracy, and robust glitch immunity - addressing critical power integrity needs in safety-critical embedded control.
FAQ
What is the guaranteed operating temperature range for the LTC2918IMS-A1#TRPBF?
The LTC2918IMS-A1#TRPBF is rated for –40°C to 85°C (I-grade), fully specified across this range for all key parameters including threshold accuracy (±1.5%), reset timeout (200ms), and quiescent current (30μA typical). This makes it suitable for under-dash automotive modules and industrial control cabinets without derating.
Does the LTC2918IMS-A1#TRPBF support windowed watchdog functionality?
No - the LTC2918IMS-A1#TRPBF is an A1 version and implements standard (non-windowed) watchdog operation. It requires only that the WDI pin be toggled before the upper boundary (1.6s when WT = VCC) expires. Windowed watchdog (with lower boundary enforcement) is exclusive to B1 variants like LTC2918IMS-B1#TRPBF.
How does the manual reset (MR) pin behave on the LTC2918IMS-A1#TRPBF?
The MR pin on the LTC2918IMS-A1#TRPBF is active-low with a 100kΩ internal pull-up to VCC. When pulled low (e.g., by a push button to GND), it immediately asserts RST for one full reset timeout period (200ms if RT = VCC), then releases RST. No external pull-up is required.
Can the LTC2918IMS-A1#TRPBF monitor a 12V supply directly?
Yes - the LTC2918IMS-A1#TRPBF can monitor a 12V supply using its internal 6.2V shunt regulator on the VCC pin. A series current-limiting resistor (e.g., 11kΩ for 12V) is required between the 12V source and VCC to keep input current ≤5mA, while VM monitors the 12V rail directly with SEL1/SEL2 set to VCC/VCC for 12V–5% (11.4V) threshold.
What is the minimum VCC voltage required for valid RST assertion on the LTC2918IMS-A1#TRPBF?
The LTC2918IMS-A1#TRPBF guarantees RST assertion for VCC ≥ 0.8V, meaning it will drive RST low during power-up as soon as the supply reaches 0.8V - well before most MCUs exit their internal reset state. This ensures early and reliable reset signaling even during severe brown-out conditions.
LTC2918IMS-A1#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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP
LTC2918IMS-A1#TRPBF FAQ
1.How can I place an order for LTC2918IMS-A1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2918IMS-A1#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 LTC2918IMS-A1#TRPBF reliable?
The price and inventory of LTC2918IMS-A1#TRPBF 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#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2918IMS-A1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2918IMS-A1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2918IMS-A1#TRPBF?
LTC2918IMS-A1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2918IMS-A1#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 LTC2918IMS-A1#TRPBF?
For technical support, including LTC2918IMS-A1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2918IMS-A1#TRPBF requirements.
6.How does Aetrix verify that LTC2918IMS-A1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2918IMS-A1#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 LTC2918IMS-A1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2918IMS-A1#TRPBF?
All LTC2918IMS-A1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2918IMS-A1#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 LTC2918IMS-A1#TRPBF part is unused and in its original packaging.
Return procedure for LTC2918IMS-A1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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