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Analog Devices Inc. LTC2918HDDB-A1#TRMPBF
- Part No.:
- LTC2918HDDB-A1#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC2918HDDB-A1#TRMPBF.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 10DFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LTC2918HDDB-A1#TRMPBF from Analog Devices (formerly Linear Technology) is a high-temperature 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 125°C, and delivers reliable reset assertion for automotive control systems and industrial embedded power-up sequencing.
For engineers reviewing the LTC2918HDDB-A1#TRMPBF datasheet, LTC2918HDDB-A1#TRMPBF pinout, LTC2918HDDB-A1#TRMPBF application, or LTC2918HDDB-A1#TRMPBF equivalent, key selection criteria include its DFN-10 (3mm × 2mm) package, internal 200ms reset timeout, windowed watchdog capability (A1 version supports standard watchdog only), MR pin compatibility with push-button interfaces, and guaranteed RST assertion down to VCC ≥ 0.8V.
Technical Context
The LTC2918HDDB-A1#TRMPBF implements a precision comparator-based monitoring architecture with three-state SEL1/SEL2 inputs selecting one of nine nominal thresholds (12V, 5V, 3.3V, 2.5V, 1.8V, 1.5V, 1.2V, 1V, or ADJ), while its fixed –5% tolerance eliminates TOL pin dependency. Its open-drain RST output asserts low when VM falls below the selected threshold and remains asserted for an internal 200ms timeout after recovery.
It integrates dual timing paths: RT pin configures reset timeout (200ms when tied to VCC), and WT pin sets watchdog upper boundary (1.6s when tied to VCC). The MR input provides active-low manual reset with internal 100kΩ pull-up, enabling direct push-button interfacing without external components. Guaranteed operation to 125°C and ±1.5% threshold accuracy across temperature support AEC-Q100-aligned automotive applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | 1.5V to 5.5V - supports direct connection to logic rails; shunt regulation enables operation up to 6.2V with series resistor. |
| Threshold Accuracy | ±1.5% over –40°C to 125°C - ensures reliable trip point margining against supply tolerances in harsh environments. |
| Reset Timeout | 200ms (internal, RT = VCC) - provides sufficient hold time for microcontroller initialization during power-up. |
| Watchdog Upper Boundary | 1.6s (internal, WT = VCC) - allows flexible software execution window before system reset is triggered. |
| Quiescent Current | 30μA typical - enables use in always-on subsystems without significant battery drain. |
| RST Output Type | Open-drain - permits wired-OR configuration with multiple supervisors and interface with diverse logic families. |
| Manual Reset Input | MR with internal 100kΩ pull-up - eliminates need for external biasing; compatible with momentary SPST switches. |
Pinout & Package
Package: 10-lead (3mm × 2mm) plastic DFN with exposed pad (pin 11), rated for –40°C to 125°C operation and θJA = 43°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND | Ground reference | Primary return path for all internal circuitry and external bypass capacitors. |
| MR | Manual reset input | Active-low input with internal 100kΩ pull-up to VCC; initiates reset pulse on falling edge. |
| SEL2 | Threshold select input | Three-state (VCC/GND/open) control for second bit of 9-threshold matrix; determines nominal voltage level. |
| SEL1 | Threshold select input | Three-state (VCC/GND/open) control for first bit of 9-threshold matrix; works with SEL2 to set VM trip point. |
| VM | Monitor input | High-impedance comparator input; compares against internally generated threshold derived from SEL1/SEL2. |
| RST | Reset output | Open-drain output asserting low during undervoltage or reset timeout; requires external pull-up. |
| RT | Reset timeout control | Configures internal reset timer; tied to VCC for 200ms timeout, open for ~400μs, or capacitor-ground for adjustable delay. |
| WT | Watchdog timeout control | Configures watchdog upper boundary; tied to VCC for 1.6s, open for ~3.2ms, or capacitor-ground for extended timeout. |
| WDI | Watchdog input | Edge-sensitive input requiring toggling within watchdog upper boundary to prevent RST assertion. |
| VCC | Power supply input | Accepts 1.5V–5.5V directly; includes internal 6.2V shunt regulator for higher-voltage operation with series resistor. |
Key Features
| Feature | Design Value |
|---|---|
| 9 programmable 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; ensures consistent trip point margining. |
| Integrated manual reset | MR pin with internal 100kΩ pull-up enables direct push-button interface-no external components required. |
| Glitch-immune comparator | Combines 100μs minimum glitch rejection (tUV ≤ 150μs) with 200ms timeout to suppress transients near threshold. |
| High-temperature operation | Guaranteed functionality at TJ = 125°C supports under-hood automotive ECUs and industrial motor drives. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC Power Sequencing |
|---|---|
Use Scenario: Monitors 5V microcontroller supply during cold cranking where battery dips to 6V and causes rail instability. IC Role / Device Role / Timing Role: Voltage supervisor asserting RST until 5V rail stabilizes above 4.75V (5V × 0.95) and holds for 200ms. Use Value: Prevents MCU lockup by ensuring firmware executes only after stable power, leveraging ±1.5% threshold accuracy at 125°C. |
Use Scenario: Coordinates startup of FPGA, ADC, and communication ICs in modular I/O chassis with multi-rail power. IC Role / Device Role / Timing Role: Generates synchronized reset pulse across multiple subsystems using wired-OR RST bus. Use Value: Ensures deterministic boot order via 200ms internal timeout, eliminating race conditions between 3.3V and 1.8V domains. |
| Medical Infusion Pump Controller | Telecom Base Station Management |
Use Scenario: Validates 3.3V logic supply before enabling motor drivers and sensor interfaces in safety-critical delivery path. IC Role / Device Role / Timing Role: Supervises VM pin connected to 3.3V rail; asserts RST if voltage drops below 3.135V (3.3V × 0.95) for >10μs. Use Value: Guarantees fail-safe shutdown using 30μA quiescent current and 0.8V minimum VCC operation during brownout. |
Use Scenario: Monitors 12V backplane supply in distributed baseband unit with remote reset capability. IC Role / Device Role / Timing Role: Uses MR pin for field-service-initiated reset without accessing main controller; RST drives system-level POR. Use Value: Enables maintenance-triggered reboot via front-panel button, leveraging internal pull-up to eliminate BOM cost. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326US31D3+T | Fixed 3.08V threshold, no manual reset, SOT23-3 package, 1.2μA IQ | Limited to single-rail monitoring; lacks SEL/MR flexibility and high-temp rating | Select when only basic 3.3V supervision is needed and ultra-low IQ dominates design priority |
| TPS3808G33DBVR | Fixed 3.3V threshold, adjustable reset timeout (1.25ms–10s), SOT23-6, –40°C to 125°C | No multi-threshold selection or MR pin; requires external capacitor for timing | Choose for designs needing precise timeout tuning but not multi-supply adaptability |
Compared with MAX6326US31D3+T and TPS3808G33DBVR, the LTC2918HDDB-A1#TRMPBF uniquely combines 9-threshold configurability, integrated manual reset, and guaranteed 125°C operation-making it optimal for multi-rail automotive and industrial systems where layout efficiency and thermal robustness are critical.
Availability
LTC2918HDDB-A1#TRMPBF is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC power sequencing, medical infusion pump controllers, and telecom base station management requiring stable component supply across extended temperature ranges.
Supply support for LTC2918HDDB-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. (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 mission-critical applications demanding guaranteed accuracy, wide temperature operation, and flexible configuration in automotive, industrial, and medical systems.
FAQ
What is the operating temperature range for the LTC2918HDDB-A1#TRMPBF?
The LTC2918HDDB-A1#TRMPBF is specified for operation from –40°C to +125°C, with full electrical performance guaranteed across this range. This H-grade qualification makes it suitable for under-hood automotive applications and high-temperature industrial environments where standard commercial or industrial grade supervisors would fail.
Does the LTC2918HDDB-A1#TRMPBF support windowed watchdog functionality?
No, the LTC2918HDDB-A1#TRMPBF implements standard watchdog timing only (A1 version), not windowed watchdog. Windowed watchdog is exclusive to B1 versions (e.g., LTC2918HDDB-B1#TRMPBF). The A1 variant requires only that WDI be toggled before the upper boundary expires (1.6s when WT = VCC); no lower-bound enforcement occurs.
How is the reset timeout configured on the LTC2918HDDB-A1#TRMPBF?
The LTC2918HDDB-A1#TRMPBF offers three reset timeout configurations: tying RT to VCC yields ~200ms, leaving RT open yields ~400μs, and connecting an external capacitor (CRT) from RT to GND provides adjustable timeout per CRT = tRST × 110 pF/ms. No external components are needed for the default 200ms setting.
Can the LTC2918HDDB-A1#TRMPBF monitor a 12V supply?
Yes, the LTC2918HDDB-A1#TRMPBF supports 12V monitoring via its VM input when SEL1 and SEL2 are both tied to VCC. For direct 12V connection, the internal 6.2V shunt regulator on VCC requires a series current-limiting resistor (e.g., 11kΩ for 12V supply) to keep VCC pin current within 5mA, as specified in Absolute Maximum Ratings.
What is the function of the MR pin on the LTC2918HDDB-A1#TRMPBF?
The MR (Manual Reset) pin on the LTC2918HDDB-A1#TRMPBF is an active-low input with internal 100kΩ pull-up to VCC, allowing direct interface with a momentary push-button switch to ground. Asserting MR low while RST is high initiates a full reset cycle, holding RST low for the configured timeout period-enabling field service or user-triggered system recovery without MCU involvement.
LTC2918HDDB-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 ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x2)
LTC2918HDDB-A1#TRMPBF FAQ
1.How can I place an order for LTC2918HDDB-A1#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2918HDDB-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 LTC2918HDDB-A1#TRMPBF reliable?
The price and inventory of LTC2918HDDB-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 LTC2918HDDB-A1#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC2918HDDB-A1#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2918HDDB-A1#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2918HDDB-A1#TRMPBF?
LTC2918HDDB-A1#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2918HDDB-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 LTC2918HDDB-A1#TRMPBF?
For technical support, including LTC2918HDDB-A1#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2918HDDB-A1#TRMPBF requirements.
6.How does Aetrix verify that LTC2918HDDB-A1#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC2918HDDB-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 LTC2918HDDB-A1#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC2918HDDB-A1#TRMPBF?
All LTC2918HDDB-A1#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2918HDDB-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 LTC2918HDDB-A1#TRMPBF part is unused and in its original packaging.
Return procedure for LTC2918HDDB-A1#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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