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Analog Devices Inc. LTC2918IDDB-A1#TRMPBF
- Part No.:
- LTC2918IDDB-A1#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC2918IDDB-A1#TRMPBF.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:501
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Product details
Overview
LTC2918IDDB-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 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 units for reliable power-on reset and microcontroller supervision.
For engineers reviewing the LTC2918IDDB-A1#TRMPBF datasheet, LTC2918IDDB-A1#TRMPBF pinout, LTC2918IDDB-A1#TRMPBF application, or LTC2918IDDB-A1#TRMPBF equivalent, key selection criteria include its DFN-10 (3mm × 2mm) package, MR pin support for push-button reset, windowed watchdog capability (A1 variant uses standard watchdog only), guaranteed RST assertion down to VCC ≥ 0.8V, and operation up to 125°C junction temperature.
Technical Context
The LTC2918IDDB-A1#TRMPBF implements a dual-stage monitoring architecture: a precision comparator monitors VM against one of nine factory-programmed thresholds selected via SEL1/SEL2 three-state inputs, while an independent watchdog logic block validates WDI edge timing against programmable upper boundary (tWDU = 1.6s internal). Its fixed –5% tolerance eliminates TOL pin usage versus LTC2917, simplifying configuration.
Reset assertion is controlled by internal 200ms timer when RT = VCC, with glitch immunity ensured by 10μs–150μs input filtering (tUV) and open-drain RST output capable of sinking 2.5mA at 3.3V. The device integrates a 6.2V shunt regulator on VCC, enabling direct 12V supply operation with external current-limiting resistor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | 1.5V to 5.5V nominal; supports up to 12V via integrated 6.2V shunt regulator with series resistor |
| Threshold Accuracy | ±1.5% over full temperature range (–40°C to 85°C), ensuring reliable trip point across automotive environments |
| Quiescent Current | 30μA typical - enables always-on supervision in battery-backed systems without significant drain |
| Reset Timeout | 200ms internal (RT = VCC); also supports adjustable timeout via external capacitor (9ms/nF scaling) |
| Watchdog Type | Standard (non-windowed) timeout - tWDU(INT) = 1.6s when WT = VCC; no lower-bound enforcement (A1 version) |
| RST Output | Open-drain, guaranteed low to 0.15V at 2.5mA load (VCC = 3.3V), supports wired-OR multi-supervisor configurations |
| Operating Temp | –40°C to +85°C (I-grade), validated for under-hood automotive electronics and industrial controllers |
Pinout & Package
Package: 10-lead (3mm × 2mm) plastic DFN with exposed pad (pin 11, optional GND connection). Pin count, footprint, and thermal resistance (θJA = 43°C/W) are optimized for space-constrained automotive PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND | Ground reference | Primary return path for all internal circuitry and RST sink current; must be low-impedance |
| MR | Manual Reset Input | Active-low input with 100kΩ internal pull-up; asserts RST for full timeout when pulled low - enables push-button reset 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); no external resistors required |
| VM | Monitor Voltage Input | High-impedance comparator input (0.5–15V range); compares against selected threshold; supports external divider for ADJ mode |
| RST | Reset Output | Open-drain output asserting low during fault or timeout; requires external pull-up; sinks ≥2.5mA at 3.3V |
| RT | Reset Timeout Control | Connect to VCC for 200ms internal timeout; leave open for ~400μs; add capacitor for adjustable delay (9ms/nF) |
| WT | Watchdog Timeout Control | Tie to VCC for 1.6s internal watchdog timeout; open for 3.2ms; GND disables watchdog - no windowing in A1 version |
| WDI | Watchdog Input | Edge-triggered input; falling edge resets watchdog timer; must toggle within tWDU to prevent RST assertion |
| VCC | Power Supply Input | Accepts 1.5–5.5V directly; >5.7V requires series resistor due to internal 6.2V shunt regulator |
Key Features
| Feature | Design Value |
|---|---|
| 9-Step Threshold Selection | Hardware-configurable via SEL1/SEL2 (no firmware or external resistors) - supports 12V, 5V, 3.3V, 2.5V, 1.8V, 1.5V, 1.2V, 1.0V, and ADJ (0.5V reference) |
| Fixed –5% Tolerance | Eliminates need for TOL pin routing and reduces BOM count vs. LTC2917; ensures consistent trip margin for 5% supply rails |
| Integrated Manual Reset | MR pin with 100kΩ internal pull-up enables direct push-button interface - removes external pull-up and debouncing circuitry |
| Glitch-Immune Comparator | Guaranteed 10μs minimum pulse rejection (tUV) prevents false resets from transient noise near threshold crossing |
| Shunt Regulator Support | 6.2V VCC shunt allows direct 12V battery connection with single series resistor - simplifies high-voltage power domain interfacing |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Monitors 5V microcontroller supply in engine bay environment subject to wide temperature swings and load dump transients. IC Role / Device Role / Timing Role: Voltage supervisor asserting RST during undervoltage events; provides 200ms reset hold time and manual reset via service port button. Use Value: Guarantees clean processor boot after cold crank (VCC ≥ 0.8V valid), prevents brownout-induced corruption, and enables field service recovery without power cycle. |
Use Scenario: Supervises 3.3V FPGA configuration rail in modular automation controller with hot-swap capability. IC Role / Device Role / Timing Role: Detects supply sag during module insertion; uses ADJ mode with external divider to precisely match FPGA VCCIO tolerance. Use Value: ±1.5% threshold accuracy ensures reset occurs only outside 3.3V ±5% spec, avoiding nuisance resets during transient loading. |
| Telecom Base Station Power Shelf | Medical Infusion Pump Controller |
|
Use Scenario: Validates 12V backplane supply feeding multiple DC/DC converters in redundant telecom power system. IC Role / Device Role / Timing Role: Primary supervisor with MR pin tied to service switch; uses internal 200ms reset to coordinate sequenced converter startup. Use Value: 6.2V shunt regulator enables direct 12V monitoring without level-shifting, reducing component count and failure points. |
Use Scenario: Ensures safe power-up of ARM-based pump controller in battery-operated medical device with strict safety certification. IC Role / Device Role / Timing Role: Provides fail-safe reset during battery voltage decay; watchdog monitors firmware heartbeat to detect lockup. Use Value: 30μA quiescent current extends battery life; guaranteed RST assertion at VCC ≥ 0.8V ensures reset even during deep discharge. |
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 selectable voltages or manual reset; 1.2μA IQ; SOT23-3 package | Suitable only for single-rail 3V systems; lacks configurability and MR pin | Select when cost and size are critical and only 2.93V supervision is needed - not a functional replacement for LTC2918IDDB-A1#TRMPBF |
| TPS3808G33DBVR | Fixed 3.3V threshold; adjustable reset timeout (1.25ms–10s); no watchdog or MR; 16μA IQ; SOT23-6 | Supports longer timeouts but no voltage selection or manual reset; requires external RC for adjustment | Choose for low-power 3.3V-only applications needing extended reset hold; does not replicate LTC2918IDDB-A1#TRMPBF's flexibility |
Compared with MAX6326UT29D3+T and TPS3808G33DBVR, the LTC2918IDDB-A1#TRMPBF uniquely combines multi-threshold selection, manual reset, and integrated watchdog in a DFN-10 package - making it irreplaceable for designs requiring field-serviceable reset and adaptable rail monitoring.
Availability
LTC2918IDDB-A1#TRMPBF is available at Aetrix Electronics and suitable for automotive control systems, industrial PLCs, telecom power shelves, and medical infusion pumps requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LTC2918IDDB-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 (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving aerospace, automotive, industrial, and communications markets.
The LTC2918 belongs to Linear's precision supervisory IC product line, designed specifically for mission-critical power monitoring in harsh environments where reliability, accuracy, and configurability outweigh cost sensitivity.
FAQ
What is the operating temperature range for the LTC2918IDDB-A1#TRMPBF?
The LTC2918IDDB-A1#TRMPBF is rated for –40°C to +85°C (I-grade), verified across the full range for threshold accuracy (±1.5%), reset timeout (200ms ±30%), and quiescent current (30–45μA). This makes the LTC2918IDDB-A1#TRMPBF suitable for under-dash automotive modules and industrial control enclosures without derating.
Does the LTC2918IDDB-A1#TRMPBF support windowed watchdog functionality?
No - the LTC2918IDDB-A1#TRMPBF implements standard watchdog timing only (upper boundary enforcement). Windowed watchdog (requiring both upper and lower timing bounds) is exclusive to B1 versions (e.g., LTC2918IDDB-B1#TRMPBF). The A1 suffix confirms non-windowed operation, which simplifies firmware design for basic heartbeat validation.
How is the reset timeout configured on the LTC2918IDDB-A1#TRMPBF?
The LTC2918IDDB-A1#TRMPBF offers three reset timeout options: tie RT to VCC for 200ms internal timeout, leave RT open for ~400μs, or connect an external capacitor (CRT) from RT to GND for adjustable delay (9ms/nF scaling). For example, a 2.2nF capacitor yields ~20ms timeout - enabling precise alignment with processor boot requirements in the LTC2918IDDB-A1#TRMPBF.
Can the LTC2918IDDB-A1#TRMPBF monitor a 12V supply directly?
Yes - the LTC2918IDDB-A1#TRMPBF integrates a 6.2V shunt regulator on VCC. To monitor 12V, connect it through a series current-limiting resistor (e.g., 11kΩ for 12V automotive) to keep VCC pin current ≤5mA. The device then regulates internally to 5.5V, enabling direct 12V rail supervision without external regulators - a key feature of the LTC2918IDDB-A1#TRMPBF.
What is the function of the MR pin on the LTC2918IDDB-A1#TRMPBF?
The MR (Manual Reset) pin on the LTC2918IDDB-A1#TRMPBF is an active-low input with 100kΩ internal pull-up, allowing direct connection to a momentary push button (button-to-GND). Pulling MR low asserts RST for the full reset timeout period - enabling field service reset without modifying firmware or cycling power. This distinguishes the LTC2918IDDB-A1#TRMPBF from the LTC2917 family.
LTC2918IDDB-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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x2)
LTC2918IDDB-A1#TRMPBF FAQ
1.How can I place an order for LTC2918IDDB-A1#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2918IDDB-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 LTC2918IDDB-A1#TRMPBF reliable?
The price and inventory of LTC2918IDDB-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 LTC2918IDDB-A1#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC2918IDDB-A1#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2918IDDB-A1#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2918IDDB-A1#TRMPBF?
LTC2918IDDB-A1#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2918IDDB-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 LTC2918IDDB-A1#TRMPBF?
For technical support, including LTC2918IDDB-A1#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2918IDDB-A1#TRMPBF requirements.
6.How does Aetrix verify that LTC2918IDDB-A1#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC2918IDDB-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 LTC2918IDDB-A1#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC2918IDDB-A1#TRMPBF?
All LTC2918IDDB-A1#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2918IDDB-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 LTC2918IDDB-A1#TRMPBF part is unused and in its original packaging.
Return procedure for LTC2918IDDB-A1#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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