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Analog Devices Inc. LTC2918IDDB-A1#TRPBF
- Part No.:
- LTC2918IDDB-A1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC2918IDDB-A1#TRPBF.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,044
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Product details
Overview
LTC2918IDDB-A1#TRPBF 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 supply, consumes 30μA quiescent current, guarantees ±1.5% threshold accuracy over –40°C to 125°C, and delivers 200ms internal reset timeout - used in automotive control systems for reliable power-on reset and microcontroller supervision.
For engineers reviewing the LTC2918IDDB-A1#TRPBF datasheet, LTC2918IDDB-A1#TRPBF pinout, LTC2918IDDB-A1#TRPBF application, or LTC2918IDDB-A1#TRPBF equivalent, this page provides verified functional specifications, DFN-10 package layout, real-world timing behavior (tRST = 200ms, tWDU = 1.6s), manual reset interface details, and validated alternative parts for system-level reliability design.
Technical Context
The LTC2918IDDB-A1#TRPBF implements a dual-timer architecture: an internal 200ms reset timer activated by VCC reaching ≥0.8V and VM crossing its selected threshold, plus a windowed watchdog timer (B-version only) requiring WDI falling edges within both upper (1.6s) and lower (50ms) boundaries. Its MR pin features a 100kΩ internal pull-up, enabling direct push-button interfacing without external components.
Threshold selection uses two three-state inputs (SEL1/SEL2) to choose among nine nominal voltages (12V, 5V, 3.3V, 2.5V, 1.8V, 1.5V, 1.2V, 1.0V, ADJ=0.5V); tolerance is fixed at –5%. The device includes glitch filtering (tUV = 10–150μs), 6.2V shunt regulation for high-voltage operation, and guaranteed RST assertion down to VCC = 0.8V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | 1.5V to 5.5V - supports direct connection to logic rails; shunt regulator enables operation up to 12V with series resistor |
| Reset Threshold Accuracy | ±1.5% over –40°C to 125°C - ensures no nuisance resets across full automotive temperature range |
| Internal Reset Timeout | 200ms (typical) when RT tied to VCC - eliminates need for external capacitor in standard power-up sequencing |
| Watchdog Timeout (A1) | 1.6s (typical) when WT tied to VCC - provides robust software execution monitoring without external timing components |
| Quiescent Current | 30μA (typical) - enables use in always-on automotive modules without battery drain concerns |
| Manual Reset Input | MR pin with 100kΩ internal pull-up - allows momentary push-button reset with zero external parts |
| Operating Temperature | –40°C to 125°C (H-grade) - qualified for under-hood automotive applications per AEC-Q100 stress requirements |
Pinout & Package
Package: 10-lead (3mm × 2mm) plastic DFN with exposed pad (pin 11, optional GND connection). Pin count and physical dimensions match industry-standard DFN-10 footprint for drop-in PCB compatibility.
| 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; asserts RST for one reset timeout period when pulled low |
| SEL2 | Threshold select bit 1 | Three-state input (VCC/GND/open) selecting one of nine nominal monitor voltages per Table 1 |
| SEL1 | Threshold select bit 0 | Three-state input (VCC/GND/open) completing 9-way voltage selection; open state required for 1.8V/ADJ modes |
| VM | Monitored supply input | High-impedance comparator input; compares against selected threshold; supports ADJ mode via external resistive divider |
| 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 | Tie to VCC for 200ms internal timeout; leave open for ~400μs; connect capacitor for adjustable timing (9ms/nF) |
| WT | Watchdog timeout control | Tie to VCC for 1.6s internal timeout (A1 version); open for ~3.2ms; GND disables watchdog |
| WDI | Watchdog input | Falling-edge sensitive; must toggle within 1.6s to prevent RST assertion; ignored if WT = GND |
| 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-Step Selectable Thresholds | Enables single-part support for 12V, 5V, 3.3V, 2.5V, 1.8V, 1.5V, 1.2V, 1.0V, and ADJ (0.5V) supplies - reduces BOM count across multi-rail systems |
| Fixed –5% Tolerance | Eliminates TOL pin complexity vs. LTC2917; simplifies layout and firmware configuration while maintaining ±1.5% absolute accuracy |
| Integrated Manual Reset | MR pin with internal 100kΩ pull-up enables push-button reset without external resistors - critical for field service and diagnostics |
| Glitch-Immune Comparator | Combines 10–150μs minimum pulsewidth rejection (tUV) with 200ms reset timeout to suppress transients without sacrificing threshold precision |
| Automotive-Temperature Qualified | Rated for –40°C to 125°C operation with guaranteed performance - meets AEC-Q100 Grade 0/1 requirements for engine control units |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC Power Monitoring |
|---|---|
Use Scenario: Supervising 5V microcontroller supply and 12V sensor bus in under-hood ECU with wide thermal cycling. IC Role / Device Role / Timing Role: Voltage supervisor with manual reset and watchdog; asserts RST on undervoltage or software hang; 200ms reset timeout ensures clean processor boot. Use Value: Prevents corrupted firmware execution during cold cranking (battery dip to 6V) and hot soak (125°C ambient) using guaranteed ±1.5% threshold accuracy. |
Use Scenario: Monitoring 3.3V FPGA configuration rail and 24V I/O power in factory automation controller. IC Role / Device Role / Timing Role: Dual-supply supervisor with independent threshold selection (SEL1/SEL2); MR pin enables maintenance-mode reset without power cycle. Use Value: Reduces mean time to repair (MTTR) by allowing field technicians to trigger safe reinitialization via front-panel button, avoiding full system shutdown. |
| Telecom Base Station Management | Medical Diagnostic Imaging Power Sequencing |
Use Scenario: Ensuring reliable startup of 1.8V DSP core and 12V RF amplifier in 5G remote radio unit operating at –40°C to 85°C. IC Role / Device Role / Timing Role: High-accuracy supervisor with ADJ mode; VM connected to resistive divider off 12V rail to set custom 10.64V trip point. Use Value: Enables precise margin testing of 12V supply tolerance (–15%) while maintaining ±1.5% trip accuracy across temperature - critical for FCC compliance testing. |
Use Scenario: Controlling power-up sequence of 2.5V ADC and 5V motor driver in MRI subsystem with strict safety interlocks. IC Role / Device Role / Timing Role: Watchdog-enabled supervisor; WDI driven by FPGA heartbeat signal; RST triggers emergency shutdown on missed pulse. Use Value: Meets IEC 62304 Class C software safety requirements by detecting firmware lockup within 1.6s and initiating fail-safe power-down. |
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 | Fixed 2.93V threshold; no manual reset; 140ms reset timeout; SOT23-5 package | Single-threshold, space-constrained designs where 2.93V monitoring suffices and MR is unnecessary | Select when board area is critical and only 2.93V rail supervision is needed; not suitable for multi-rail or field-service reset requirements |
| TPS3808G33DBVR | Fixed 3.3V threshold; adjustable reset timeout (1.25ms–10s); no watchdog; SOT23-6 package | Cost-sensitive industrial applications needing programmable delay but no software supervision | Choose for simple 3.3V power-good signaling with flexible timing; lacks watchdog and MR functionality of LTC2918IDDB-A1#TRPBF |
Compared with MAX6326UT29D3+T and TPS3808G33DBVR, the LTC2918IDDB-A1#TRPBF uniquely combines 9-threshold flexibility, manual reset, and watchdog in a 3mm×2mm DFN - making it optimal for automotive and high-reliability systems requiring field serviceability and software fault detection.
Availability
LTC2918IDDB-A1#TRPBF is available at Aetrix Electronics and suitable for automotive control systems, industrial PLCs, telecom base stations, and medical imaging equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC2918IDDB-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 (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 LTC2918 belongs to Linear's precision power monitoring product line, designed specifically for automotive-grade reliability, low-power operation, and flexible system supervision in harsh environments - emphasizing guaranteed accuracy, wide temperature support, and integrated safety features.
FAQ
What is the operating temperature range for the LTC2918IDDB-A1#TRPBF?
The LTC2918IDDB-A1#TRPBF is rated for –40°C to 125°C operation, meeting automotive Grade H specifications. This range is confirmed in the Order Information table where "HDDB" denotes the high-temperature grade, and electrical characteristics are guaranteed across this full span with ±1.5% threshold accuracy and 30μA typical quiescent current.
Does the LTC2918IDDB-A1#TRPBF support adjustable watchdog timeout?
Yes, the LTC2918IDDB-A1#TRPBF supports adjustable watchdog timeout via the WT pin. With WT tied to VCC, it delivers a fixed 1.6s timeout; connecting an external capacitor (CWT) to GND sets timeout per CWT = tWD × 13.8 nF/s. Leaving WT open yields ~3.2ms, and tying WT to GND disables the watchdog entirely - all confirmed in the Applications Information section.
How does the manual reset (MR) pin function on the LTC2918IDDB-A1#TRPBF?
The MR pin on the LTC2918IDDB-A1#TRPBF is an active-low input with a 100kΩ internal pull-up to VCC, enabling direct push-button interface. When pulled low while RST is high, it initiates a reset pulse lasting one full reset timeout period (e.g., 200ms when RT = VCC). The pin's VIH = 0.8×VCC and VIL = 0.2×VCC ensure robust noise immunity, as specified in the Electrical Characteristics table.
Can the LTC2918IDDB-A1#TRPBF monitor a 12V supply?
Yes, the LTC2918IDDB-A1#TRPBF monitors 12V supplies using SEL1 = VCC and SEL2 = VCC per the Monitor Selection Table. For direct 12V connection, the internal 6.2V shunt regulator requires a series current-limiting resistor (RCC) sized per RCC ≤ (VS(MIN) − 5.7V)/5mA. Typical values (e.g., 11kΩ for 12V auto battery) are shown in Figure 3 of the datasheet.
What is the reset timeout behavior during power-up for the LTC2918IDDB-A1#TRPBF?
During power-up, the LTC2918IDDB-A1#TRPBF asserts RST low as soon as VCC reaches 0.8V (guaranteed minimum), holds RST low until VCC exceeds 1.5V (undervoltage lockout release), then starts the reset timeout after VM crosses its selected threshold. With RT tied to VCC, this yields a precise 200ms delay before RST releases - ensuring stable power conditions before processor release.
LTC2918IDDB-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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x2)
LTC2918IDDB-A1#TRPBF FAQ
1.How can I place an order for LTC2918IDDB-A1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2918IDDB-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 LTC2918IDDB-A1#TRPBF reliable?
The price and inventory of LTC2918IDDB-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 LTC2918IDDB-A1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2918IDDB-A1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2918IDDB-A1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2918IDDB-A1#TRPBF?
LTC2918IDDB-A1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2918IDDB-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 LTC2918IDDB-A1#TRPBF?
For technical support, including LTC2918IDDB-A1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2918IDDB-A1#TRPBF requirements.
6.How does Aetrix verify that LTC2918IDDB-A1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2918IDDB-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 LTC2918IDDB-A1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2918IDDB-A1#TRPBF?
All LTC2918IDDB-A1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2918IDDB-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 LTC2918IDDB-A1#TRPBF part is unused and in its original packaging.
Return procedure for LTC2918IDDB-A1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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