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Analog Devices Inc. LTC2918CDDB-A1#TRPBF
- Part No.:
- LTC2918CDDB-A1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC2918CDDB-A1#TRPBF.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,404
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Product details
Overview
LTC2918CDDB-A1#TRPBF from Analog Devices (formerly Linear Technology) is a precision voltage supervisor IC with manual reset input, 9 selectable supply thresholds (including adjustable 0.5V mode), fixed –5% tolerance, and integrated watchdog timer. It operates from 1.5V to 5.5V, consumes 30μA typical quiescent current, guarantees ±1.5% threshold accuracy over –40°C to 125°C, and delivers reliable reset assertion down to VCC ≥ 0.8V - used in automotive control systems for power-on reset and fault recovery.
For engineers reviewing the LTC2918CDDB-A1#TRPBF datasheet, LTC2918CDDB-A1#TRPBF pinout, LTC2918CDDB-A1#TRPBF application, or LTC2918CDDB-A1#TRPBF equivalent, key selection criteria include its DFN-10 (3mm × 2mm) package, MR pin support for push-button reset, windowed watchdog capability (A1 version supports standard watchdog only), internal 200ms reset timeout, and guaranteed operation at 125°C junction temperature.
Technical Context
The LTC2918CDDB-A1#TRPBF implements a dual-stage monitoring architecture: a high-impedance VM comparator with nine factory-programmed thresholds selected via SEL1/SEL2 three-state inputs, and an open-drain RST output with programmable timeout (internal 200ms or external capacitor). Its fixed –5% tolerance eliminates TOL pin usage versus LTC2917, simplifying design while maintaining ±1.5% absolute threshold accuracy across temperature.
It integrates a standard (non-windowed) watchdog timer with 1.6s internal upper boundary (WT = VCC), adjustable via external capacitor on WT pin, and features a dedicated active-low manual reset (MR) input with internal 100kΩ pull-up - enabling direct push-button interface without external components. Glitch immunity is ensured by combined anti-glitch circuitry (tUV ≤ 150μs) and reset timeout filtering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | 1.5V to 5.5V - powers directly from low-voltage rails; shunt regulation enables use up to 12V with series resistor |
| Threshold Accuracy | ±1.5% over –40°C to 125°C - ensures reliable trip point margining against supply tolerance bands |
| Reset Timeout | 200ms (internal, RT = VCC) - provides stable power-up sequencing without external capacitor |
| Watchdog Upper Boundary | 1.6s (internal, WT = VCC) - sets maximum allowed microprocessor activity interval before system reset |
| Quiescent Current | 30μA typical - enables battery-backed or ultra-low-power embedded monitoring |
| VM Input Impedance | 0.5–8MΩ - minimizes loading on monitored supply, critical for high-impedance divider networks |
| RST Output Type | Open-drain - supports wired-OR reset bus and logic-level translation up to 6.2V |
Pinout & Package
Package: 10-lead (3mm × 2mm) plastic DFN with exposed pad (pin 11, optional GND connection).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND | Ground reference | Primary return path for all internal circuits and RST pull-down current |
| MR | Manual reset input | Active-low signal with internal 100kΩ pull-up - enables momentary push-button reset without external components |
| SEL2 / SEL1 | Threshold select inputs | Three-state pins (VCC/GND/open) selecting one of nine nominal thresholds (12V to ADJ 0.5V) |
| VM | Monitor input | High-impedance comparator input - connects to supply rail or resistive divider tap for precise trip-point setting |
| RST | Reset output | Open-drain output asserting low during undervoltage or watchdog timeout - requires external pull-up |
| RT | Reset timeout control | Configures internal timer: open = ~400μs, VCC = ~200ms, capacitor to GND = adjustable (9ms/nF) |
| WT | Watchdog timeout control | Configures watchdog upper boundary: open = ~3.2ms, VCC = ~1.6s, capacitor to GND = adjustable (72ms/nF) |
| WDI | Watchdog input | Edge-triggered input requiring toggle within watchdog upper boundary to prevent RST assertion |
| VCC | Power supply input | Operates as direct supply (≤5.5V) or shunt-regulated input (up to 12V with series resistor) |
Key Features
| Feature | Design Value |
|---|---|
| 9 Selectable Thresholds | Enables single-part support for 12V, 5V, 3.3V, 2.5V, 1.8V, 1.5V, 1.2V, 1V, and ADJ (0.5V) supplies without external resistors |
| Fixed –5% Tolerance | Eliminates need for TOL pin routing and simplifies PCB layout versus LTC2917 variants |
| Integrated Manual Reset | MR pin with internal 100kΩ pull-up allows direct push-button interface - no external components required |
| Glitch-Immune Comparator | tUV ≤ 150μs ensures immunity to short-duration supply transients near threshold, preventing false resets |
| 125°C Junction Operation | Qualified for under-hood automotive applications where ambient temperatures exceed 105°C |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC Power Sequencing |
|---|---|
Use Scenario: Monitoring 5V microcontroller supply in engine control module subject to load dump and cold-crank conditions. IC Role / Device Role / Timing Role: Voltage supervisor asserting RST during undervoltage events and providing 200ms reset hold time after recovery. Use Value: Guarantees ±1.5% threshold accuracy at 125°C, ensuring reliable reset even during extreme thermal cycling. | Use Scenario: Coordinating power-up sequence of FPGA, ADC, and communication ICs in programmable logic controller. IC Role / Device Role / Timing Role: Generating synchronized reset pulse using internal 200ms timer and monitoring 3.3V I/O supply. Use Value: Eliminates need for external RC timing network, reducing BOM count and improving timing consistency across temperature. |
| Medical Infusion Pump Controller | Telecom Base Station Management |
Use Scenario: Supervising 1.8V processor core supply in battery-powered infusion pump with manual reset button for field service. IC Role / Device Role / Timing Role: Providing fail-safe reset via MR pin and detecting brownout on VM input with glitch immunity. Use Value: Internal 100kΩ MR pull-up enables direct push-button integration - no additional passives needed for service reset. | Use Scenario: Monitoring 12V backplane supply in 5G base station remote radio unit with watchdog supervision of FPGA firmware. IC Role / Device Role / Timing Role: Using WDI input to verify FPGA health and asserting RST if watchdog timeout occurs due to lockup. Use Value: 1.6s internal watchdog upper boundary aligns with typical FPGA configuration and boot time requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326UT29D3+T | Single 2.93V fixed threshold, no manual reset, no watchdog, SOT23-5 package | Suitable only for fixed-threshold 3V systems; lacks configurability and MR functionality | Select when cost-sensitive, space-constrained designs require basic reset only - not for multi-rail or watchdog needs |
| TPS3808G33DBVR | 3.3V fixed threshold, adjustable reset delay (0.5ms–10s), no manual reset, no watchdog, SOT23-6 | Offers wide delay range but no threshold selection or MR pin - limited to 3.3V monitoring | Choose for precise reset timing control in 3.3V-only systems where watchdog and manual reset are unnecessary |
Compared with MAX6326UT29D3+T and TPS3808G33DBVR, the LTC2918CDDB-A1#TRPBF provides unique value through its 9-threshold flexibility, integrated MR pin, and watchdog timer - making it suitable for complex multi-rail systems requiring field-service reset and firmware health monitoring, whereas alternatives serve only fixed-threshold, single-supply applications.
Availability
LTC2918CDDB-A1#TRPBF is available at Aetrix Electronics and suitable for automotive control units, industrial PLCs, medical infusion pumps, and telecom base stations requiring stable component supply with guaranteed 125°C operation and long-term lifecycle support.
Supply support for LTC2918CDDB-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. (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 power monitoring product line, designed specifically for automotive, industrial, and medical systems demanding guaranteed operation at 125°C, ±1.5% threshold accuracy, and integrated reliability features like manual reset and watchdog supervision.
FAQ
What is the operating temperature range for the LTC2918CDDB-A1#TRPBF?
The LTC2918CDDB-A1#TRPBF is rated for operation from –40°C to 125°C (H-grade), with guaranteed performance including ±1.5% threshold accuracy and functional reset behavior across this full range. This makes the LTC2918CDDB-A1#TRPBF suitable for under-hood automotive applications and high-temperature industrial environments where standard commercial-grade supervisors would fail.
Does the LTC2918CDDB-A1#TRPBF support windowed watchdog functionality?
No, the LTC2918CDDB-A1#TRPBF implements a standard (non-windowed) watchdog timer with only an upper boundary timeout (1.6s internal). Windowed watchdog functionality - requiring both upper and lower timing boundaries - is exclusive to the "B" versions (e.g., LTC2918CDDB-B1#TRPBF). The "A1" suffix confirms this part is the standard watchdog variant, verified in the order information table and functional description.
How is the reset timeout configured on the LTC2918CDDB-A1#TRPBF?
The LTC2918CDDB-A1#TRPBF supports three reset timeout configurations: leaving RT open yields ~400μs, tying RT to VCC selects the internal 200ms timer, and connecting an external capacitor (CRT) from RT to GND provides adjustable timeout (9ms/nF). For example, a 2.2nF capacitor sets tRST ≈ 20ms. This flexibility allows the LTC2918CDDB-A1#TRPBF to meet diverse system boot-time requirements without redesigning the timing network.
Can the LTC2918CDDB-A1#TRPBF monitor a 12V supply?
Yes, the LTC2918CDDB-A1#TRPBF can monitor a 12V supply using its 12V threshold mode (SEL1 = VCC, SEL2 = VCC) and internal 6.2V shunt regulator on VCC. A series current-limiting resistor (e.g., 11kΩ) must be placed between the 12V source and VCC to limit input current to ≤5mA. This configuration is validated in the Typical Application TA03 and Absolute Maximum Ratings section, confirming safe operation for automotive and industrial 12V systems.
What is the function of the MR pin on the LTC2918CDDB-A1#TRPBF?
The MR (Manual Reset) pin on the LTC2918CDDB-A1#TRPBF is an active-low input with an internal 100kΩ pull-up to VCC, enabling direct interface with a momentary push-button switch (button-to-GND). Asserting MR low while RST is high initiates a full reset cycle with the configured timeout period. This feature is exclusive to the LTC2918 family and is absent in LTC2917 - making the LTC2918CDDB-A1#TRPBF ideal for field-serviceable equipment requiring user-initiated recovery.
LTC2918CDDB-A1#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x2)
LTC2918CDDB-A1#TRPBF FAQ
1.How can I place an order for LTC2918CDDB-A1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2918CDDB-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 LTC2918CDDB-A1#TRPBF reliable?
The price and inventory of LTC2918CDDB-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 LTC2918CDDB-A1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2918CDDB-A1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2918CDDB-A1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2918CDDB-A1#TRPBF?
LTC2918CDDB-A1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2918CDDB-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 LTC2918CDDB-A1#TRPBF?
For technical support, including LTC2918CDDB-A1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2918CDDB-A1#TRPBF requirements.
6.How does Aetrix verify that LTC2918CDDB-A1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2918CDDB-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 LTC2918CDDB-A1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2918CDDB-A1#TRPBF?
All LTC2918CDDB-A1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2918CDDB-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 LTC2918CDDB-A1#TRPBF part is unused and in its original packaging.
Return procedure for LTC2918CDDB-A1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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