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Analog Devices Inc. LTC2918CDDB-A1#TRMPBF
- Part No.:
- LTC2918CDDB-A1#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC2918CDDB-A1#TRMPBF.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 10DFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LTC2918CDDB-A1#TRMPBF 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 85°C, and delivers reliable reset assertion down to VCC ≥ 0.8V - used in automotive control modules requiring fail-safe power monitoring.
For engineers reviewing the LTC2918CDDB-A1#TRMPBF datasheet, LTC2918CDDB-A1#TRMPBF pinout, LTC2918CDDB-A1#TRMPBF application, or LTC2918CDDB-A1#TRMPBF equivalent, key selection criteria include its DFN-10 (3mm × 2mm) package, MR pin for push-button reset, windowed watchdog capability (A1 version supports standard watchdog only), internal 200ms reset timeout, and guaranteed operation up to 85°C ambient.
Technical Context
The LTC2918CDDB-A1#TRMPBF implements a dual-timer architecture: an adjustable reset timeout controlled via RT pin capacitance (or fixed 200ms when RT = VCC), and a watchdog timer with upper-bound timeout (1.6s internal, adjustable externally) - but lacks lower-bound windowing (B1 variant only). Its VM comparator uses a precision bandgap reference and glitch-filtered input path, ensuring immunity to transients <100μs at 5% threshold deviation.
Circuit-level integration includes an internal 100kΩ pull-up on MR, open-drain RST output with VOL ≤ 0.2V at 100μA, and VCC shunt regulation at 6.2V for high-voltage supply compatibility. SEL1/SEL2 three-state inputs configure nominal threshold without external resistors; tolerance is fixed at –5%, eliminating TOL pin usage versus LTC2917.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | 1.5V to 5.5V - supports direct connection to logic rails; shunt regulation enables use with 12V supplies via series resistor |
| Threshold Accuracy | ±1.5% over –40°C to 85°C - ensures no nuisance resets within system supply tolerance bands |
| Quiescent Current | 30μA typical - enables battery-backed or low-power always-on monitoring |
| Reset Timeout | 200ms internal (RT = VCC) - provides sufficient hold time for microcontroller initialization sequences |
| Watchdog Timeout | 1.6s internal (WT = VCC) - matches typical firmware loop execution windows in automotive ECUs |
| VCC Undervoltage Lockout | 1.5V max - guarantees valid operation before RST release during power-up |
| RST Output Type | Open-drain - allows wired-OR of multiple supervisors and interface with 3.3V/5V logic domains |
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; exposed pad enhances thermal performance |
| MR | Manual Reset Input | Active-low input with internal 100kΩ pull-up - directly interfaces with momentary pushbutton without external components |
| 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) |
| VM | Monitor Input | High-impedance comparator input - monitors supply voltage against selected threshold; ADJ mode accepts 0.5V reference |
| RST | Reset Output | Open-drain output asserting low during fault or reset timeout - requires external pull-up to logic rail |
| RT | Reset Timeout Control | Capacitor-adjustable timer input - 200ms timeout when tied to VCC; 400μs when open |
| WT | Watchdog Timeout Control | Capacitor-adjustable watchdog upper bound - 1.6s timeout when tied to VCC; 3.2ms when open |
| WDI | Watchdog Input | Edge-triggered input - falling edge required to clear watchdog timer (A1 version: no lower-bound windowing) |
| VCC | Power Supply Input | Input with internal 6.2V shunt regulator - enables operation from 12V automotive systems with series current-limiting resistor |
Key Features
| Feature | Design Value |
|---|---|
| 9-Select Threshold Architecture | Eliminates external resistor networks - reduces BOM count and layout area for multi-rail systems |
| Integrated Manual Reset (MR) | Enables field-serviceable system recovery without firmware intervention or external logic |
| Glitch-Filtered VM Input | Rejects transients <100μs at 5% threshold deviation - prevents false resets during load switching |
| Guaranteed RST Assertion Down to VCC = 0.8V | Ensures clean power-on reset sequencing even during brownout conditions |
| DFN-10 (3mm × 2mm) Package | Reduces PCB footprint by >40% vs MSOP-10 - critical for space-constrained automotive modules |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC I/O Module |
|---|---|
Use Scenario: Monitors 5V microcontroller supply and 12V sensor bus in under-hood ECU exposed to –40°C to 125°C ambient. IC Role / Device Role / Timing Role: Voltage supervisor with manual reset and watchdog - asserts RST if 5V rail drops below 4.75V (–5%) or WDI fails to toggle within 1.6s. Use Value: Prevents corrupted firmware execution during cold cranking voltage sag; MR pin allows technician-initiated reset without disassembly. | Use Scenario: Supervises 3.3V FPGA configuration voltage and 24V field power in modular PLC backplane. IC Role / Device Role / Timing Role: Dual-threshold monitor - uses SEL1/SEL2 to select 3.3V and ADJ modes (via external divider) for 24V sensing. Use Value: Single IC replaces two discrete supervisors; open-drain RST enables shared reset bus across multiple I/O cards. |
| Medical Infusion Pump Controller | Telecom Base Station Power Management |
Use Scenario: Ensures safe shutdown if 1.8V DSP core supply falls below specification during battery backup mode. IC Role / Device Role / Timing Role: Low-quiescent supervisor - operates from 1.5V minimum VCC and asserts RST within 150μs of VM undervoltage detection. Use Value: 30μA ICC extends battery life; ±1.5% threshold accuracy avoids premature shutdown during normal voltage ripple. | Use Scenario: Monitors redundant 48V DC-DC outputs feeding 12V intermediate bus in 5G radio unit. IC Role / Device Role / Timing Role: High-reliability watchdog supervisor - WT pin configured for 1.6s timeout synchronized to baseband processor heartbeat signal. Use Value: Detects firmware lockup before thermal runaway occurs; DFN package withstands reflow and vibration stress in outdoor enclosures. |
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; 1.6μA quiescent current; SOT23-3 package | Single-threshold, ultra-low-power monitoring only - no programmability or watchdog | Select when cost and size are critical and only one rail requires supervision |
| TPS3808G33DBVR | Fixed 3.3V threshold; adjustable watchdog (0.5s–100s); 16μA quiescent current; SOT23-6 package | Lacks manual reset and multi-threshold selection - requires external resistor for timeout adjustment | Choose for longer watchdog flexibility in non-automotive industrial designs |
Compared with MAX6326UT29D3+T and TPS3808G33DBVR, the LTC2918CDDB-A1#TRMPBF uniquely combines 9-programmable thresholds, integrated MR, and DFN-10 packaging - making it optimal for multi-rail automotive systems where layout density and field serviceability are mandatory.
Availability
LTC2918CDDB-A1#TRMPBF is available at Aetrix Electronics and suitable for automotive control systems, 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 LTC2918CDDB-A1#TRMPBF 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, acquired Linear Technology in 2017 to strengthen its power management portfolio.
The LTC2918 belongs to ADI's precision voltage supervisor product line, designed specifically for safety-critical automotive and industrial applications demanding guaranteed reset behavior, wide temperature operation, and minimal external components.
FAQ
What is the operating temperature range for the LTC2918CDDB-A1#TRMPBF?
The LTC2918CDDB-A1#TRMPBF is specified for the commercial temperature range of 0°C to 70°C. This is confirmed by its part marking "C" grade (LTC2918C) and order information table listing "0°C to 70°C" for all CDDB-A1 variants. It does not support industrial (–40°C to 85°C) or high-temp (–40°C to 125°C) grades.
Does the LTC2918CDDB-A1#TRMPBF support windowed watchdog functionality?
No, the LTC2918CDDB-A1#TRMPBF does not support windowed watchdog functionality. The "A1" suffix denotes the standard watchdog variant (LTC2918-A), which requires only that WDI be toggled before the upper timeout boundary (e.g., 1.6s). Windowed watchdog - requiring both upper and lower timing boundaries - is exclusive to "B1" versions like LTC2918CDDB-B1#TRMPBF.
How is the reset timeout configured on the LTC2918CDDB-A1#TRMPBF?
The reset timeout on the LTC2918CDDB-A1#TRMPBF is configured via the RT pin: tying RT to VCC selects the internal 200ms timeout, leaving RT open yields ~400μs, and connecting an external capacitor (CRT) to GND sets tRST ≈ 9ms/nF. The datasheet confirms this behavior in the Pin Functions section and Typical Application TA01, where RT = VCC produces tRST = 200ms.
What is the function of the MR pin on the LTC2918CDDB-A1#TRMPBF?
The MR (Manual Reset) pin on the LTC2918CDDB-A1#TRMPBF is an active-low input with an internal 100kΩ pull-up to VCC. Asserting MR low while RST is high initiates a full reset cycle - pulling RST low for the configured timeout period. This enables hardware-based system recovery without firmware involvement, as documented in the Pin Functions and Applications Information sections.
Can the LTC2918CDDB-A1#TRMPBF monitor a 12V supply directly?
Yes, the LTC2918CDDB-A1#TRMPBF can monitor a 12V supply directly using its internal 6.2V shunt regulator on the VCC pin. A series current-limiting resistor (e.g., 11kΩ for 12V) must be placed between the 12V source and VCC to limit input current to ≤5mA, as specified in Absolute Maximum Ratings and Applications Information Figure F03.
LTC2918CDDB-A1#TRMPBF 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#TRMPBF FAQ
1.How can I place an order for LTC2918CDDB-A1#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2918CDDB-A1#TRMPBF 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#TRMPBF reliable?
The price and inventory of LTC2918CDDB-A1#TRMPBF 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#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC2918CDDB-A1#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2918CDDB-A1#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2918CDDB-A1#TRMPBF?
LTC2918CDDB-A1#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2918CDDB-A1#TRMPBF 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#TRMPBF?
For technical support, including LTC2918CDDB-A1#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2918CDDB-A1#TRMPBF requirements.
6.How does Aetrix verify that LTC2918CDDB-A1#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC2918CDDB-A1#TRMPBF 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#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC2918CDDB-A1#TRMPBF?
All LTC2918CDDB-A1#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2918CDDB-A1#TRMPBF, 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#TRMPBF part is unused and in its original packaging.
Return procedure for LTC2918CDDB-A1#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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