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Analog Devices Inc. LTC2918IDDB-B1#TRMPBF
- Part No.:
- LTC2918IDDB-B1#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC2918IDDB-B1#TRMPBF.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,452
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Product details
Overview
LTC2918IDDB-B1#TRMPBF from Analog Devices (formerly Linear Technology) is a precision voltage supervisor IC with 9 selectable supply thresholds, fixed –5% tolerance, manual reset input (MR), and windowed watchdog timer. It operates from 1.5V to 5.5V, consumes 30μA typical quiescent current, guarantees ±1.5% threshold accuracy over –40°C to +85°C, and supports automotive-grade reliability. It is used in microprocessor-based systems requiring robust power-up sequencing and fault recovery - e.g., engine control units monitoring 5V or 3.3V rails.
For engineers reviewing the LTC2918IDDB-B1#TRMPBF datasheet, LTC2918IDDB-B1#TRMPBF pinout, LTC2918IDDB-B1#TRMPBF application, or LTC2918IDDB-B1#TRMPBF equivalent, key selection criteria include its B1 version's windowed watchdog (tWDL = 50ms / tWDU = 1.6s), MR pin compatibility with push-button interfaces, DFN-10 (3mm × 2mm) package, and guaranteed RST assertion down to VCC ≥ 0.8V.
Technical Context
The LTC2918IDDB-B1#TRMPBF implements a dual-stage supervision architecture: an internal comparator monitors VM against one of nine factory-programmed thresholds selected via SEL1/SEL2 three-state inputs, while a separate windowed watchdog logic block validates WDI falling-edge timing between lower (tWDL) and upper (tWDU) boundaries. Its fixed –5% tolerance eliminates TOL pin usage, distinguishing it from the LTC2917 family.
Reset timeout (tRST) and watchdog timeout are configurable via RT and WT pins - internally set to ~200ms and ~1.6s when tied to VCC, or externally adjusted using capacitors (CRT = 110 pF/ms, CWT = 13.8 nF/s). The open-drain RST output drives external pull-ups and supports wired-OR configurations across multiple supervisors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | 1.5V to 5.5V - enables direct connection to common logic rails without external regulation |
| Threshold Accuracy | ±1.5% over –40°C to +85°C - ensures reliable trip point margining for 5V±10% or 3.3V±10% supplies |
| Quiescent Current | 30μA typical - minimizes standby power impact in battery-backed or always-on systems |
| Reset Timeout (Internal) | 200ms when RT = VCC - provides sufficient hold time for processor initialization before release |
| Watchdog Upper Boundary | 1.6s when WT = VCC - aligns with firmware loop execution windows in safety-critical applications |
| Watchdog Lower Boundary | 50ms for B1 version - prevents false resets from spurious noise or jitter on WDI signal |
| RST Low Voltage | ≤0.2V at IRST = 15μA and VCC = 0.8V - guarantees clean logic-low assertion even during brownout conditions |
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 circuitry and external bypass capacitor |
| MR | Manual reset input | Active-low input with internal 100kΩ pull-up - directly interfaces to momentary switch without external components |
| SEL2, SEL1 | Threshold select inputs | Three-state logic (VCC/GND/open) - selects one of nine nominal thresholds (e.g., 3.3V, 1.8V, ADJ) |
| VM | Voltage monitor input | High-impedance comparator input - connects to supply rail or resistive divider for adjustable threshold |
| RST | Open-drain reset output | Asserts low during undervoltage or watchdog fault - requires external pull-up to system logic rail |
| RT | Reset timeout control | Configures tRST: open = ~400μs, VCC = ~200ms, capacitor to GND = adjustable (9ms/nF) |
| WT | Watchdog timeout control | Configures tWDU/tWDL: open = ~3.2ms, VCC = ~1.6s, capacitor to GND = adjustable (72ms/nF) |
| WDI | Watchdog input | Falling-edge sensitive only in B1 version - must toggle within 50ms–1.6s window to prevent RST assertion |
| VCC | Power supply input | Accepts 1.5V–5.5V directly; includes 6.2V shunt regulator for operation up to 12V with series resistor |
Key Features
| Feature | Design Value |
|---|---|
| Windowed watchdog timer | Enforces both minimum (50ms) and maximum (1.6s) WDI edge intervals - prevents lockup from stuck or oscillating firmware |
| Manual reset input (MR) | Integrated 100kΩ pull-up enables push-button reset without external parts - simplifies field service and debug workflows |
| Glitch-immune comparator | Rejects transients <10μs duration at >5% threshold deviation - avoids nuisance resets during load switching or EMI events |
| Guaranteed RST at low VCC | Asserts valid reset signal even when VCC drops to 0.8V - ensures fail-safe behavior during deep brownout |
| 9-pin-selectable thresholds | Supports 12V, 5V, 3.3V, 2.5V, 1.8V, 1.5V, 1.2V, 1.0V, and ADJ (0.5V) - eliminates external resistor networks for most rail monitoring |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC I/O Module |
|---|---|
Use Scenario: Monitoring 5V microcontroller supply in under-hood environment subject to thermal cycling and load dump transients. IC Role / Device Role / Timing Role: Voltage supervisor with windowed watchdog ensuring MCU remains responsive during CAN bus arbitration faults or sensor data corruption. Use Value: ±1.5% threshold accuracy and operation to 125°C (H-grade variant available) prevent false resets across temperature extremes; MR pin allows technician-initiated reinitialization without power cycle. | Use Scenario: Supervising 3.3V FPGA configuration rail in programmable logic controller with real-time deterministic response requirements. IC Role / Device Role / Timing Role: Dual-function supervisor providing both power-rail validation and software liveliness check via WDI interface. Use Value: 200ms internal reset timeout ensures FPGA completes configuration before releasing reset; windowed watchdog detects stalled state machine execution without requiring external timing components. |
| Medical Infusion Pump Controller | Telecom Base Station Power Management |
Use Scenario: Ensuring safe shutdown and restart of motor driver circuitry upon 1.8V digital supply undervoltage in battery-operated infusion device. IC Role / Device Role / Timing Role: Precision rail monitor with manual reset enabling clinician-triggered recalibration sequence. Use Value: ADJ mode supports custom threshold setting for 1.8V rail; MR pin allows immediate system reset after error condition without removing battery or opening enclosure. | Use Scenario: Coordinating startup sequencing of multiple 12V, 5V, and 3.3V DC-DC converters in high-density optical line terminal (OLT) chassis. IC Role / Device Role / Timing Role: Multi-rail supervisor with wired-OR RST outputs enabling centralized reset distribution across distributed power domains. Use Value: 12V threshold mode (SEL1=SEL2=VCC) and 6.2V shunt regulator allow direct 12V monitoring without level-shifting; DFN-10 footprint saves PCB area in thermally constrained modules. |
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, no watchdog, SOT23-5 package | Suitable only for single-rail monitoring without system-level fault detection | Select when simplicity and minimal footprint outweigh need for configurability and watchdog safety |
| TPS3808G33DBVR | Fixed 3.3V threshold, adjustable watchdog (non-windowed), no MR pin, SOT23-6 | Lacks windowed timing enforcement and push-button reset capability | Choose for cost-sensitive designs where basic watchdog coverage suffices and MR is implemented externally |
Compared with MAX6326UT29D3+T and TPS3808G33DBVR, the LTC2918IDDB-B1#TRMPBF offers unique value through its 9-threshold flexibility, integrated MR interface, and B1-series windowed watchdog - making it preferred for automotive, industrial, and medical systems requiring certified functional safety margins.
Availability
LTC2918IDDB-B1#TRMPBF is available at Aetrix Electronics and suitable for automotive engine control units, 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 LTC2918IDDB-B1#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 technologies, serving industrial, automotive, communications, and healthcare markets.
The LTC2918 belongs to ADI's precision power supervision product line, designed specifically for mission-critical embedded systems demanding guaranteed reset behavior, glitch immunity, and extended temperature operation - especially where ISO 26262 or IEC 61508 compliance is required.
FAQ
What is the operating temperature range for the LTC2918IDDB-B1#TRMPBF?
The LTC2918IDDB-B1#TRMPBF is rated for –40°C to +85°C (I-grade), verified per manufacturer specifications. This range supports industrial and automotive cabin applications. For under-hood use, the H-grade variant LTC2918HDDB-B1#TRMPBF extends operation to 125°C. The DFN-10 package's low thermal resistance (θJA = 43°C/W) ensures stable performance across this full range without derating.
Does the LTC2918IDDB-B1#TRMPBF require external resistors to set its voltage threshold?
No, the LTC2918IDDB-B1#TRMPBF does not require external resistors to set its voltage threshold. It uses internal resistor networks controlled by SEL1 and SEL2 three-state inputs to select among nine factory-programmed thresholds (e.g., 3.3V, 1.8V, ADJ). Only the ADJ mode requires an external resistive divider on the VM pin - all other modes configure thresholds entirely with pin strapping.
How does the windowed watchdog function differ between LTC2918-A and LTC2918-B versions?
The LTC2918IDDB-B1#TRMPBF is a B-version part, meaning its windowed watchdog requires WDI falling edges to occur strictly between tWDL (50ms) and tWDU (1.6s) - violating either boundary triggers RST. In contrast, the A-version only enforces the upper boundary (tWDU), accepting any edge before timeout. This makes the B1 version suitable for applications where both too-fast and too-slow firmware responses indicate failure.
Can the LTC2918IDDB-B1#TRMPBF monitor a 12V supply directly?
Yes, the LTC2918IDDB-B1#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 input) is required to keep VCC pin current ≤5mA. The VM pin then monitors the 12V rail in "12V" mode (SEL1 = SEL2 = VCC), with trip point guaranteed at 11.04V to 11.40V (–5% ±1.5%). No level-shifting circuitry is needed.
What is the purpose of the exposed pad on the DFN package of the LTC2918IDDB-B1#TRMPBF?
The exposed pad (pin 11) on the LTC2918IDDB-B1#TRMPBF's DFN-10 package serves as a thermal and electrical connection point. It may be left unconnected or soldered to a PCB ground plane to improve thermal dissipation (reducing θJA from 43°C/W) and enhance noise immunity. No internal circuitry is tied to this pad - it is electrically isolated from all signal pins and functions solely as a heatsink extension.
LTC2918IDDB-B1#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-B1#TRMPBF FAQ
1.How can I place an order for LTC2918IDDB-B1#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2918IDDB-B1#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-B1#TRMPBF reliable?
The price and inventory of LTC2918IDDB-B1#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-B1#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC2918IDDB-B1#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2918IDDB-B1#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2918IDDB-B1#TRMPBF?
LTC2918IDDB-B1#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2918IDDB-B1#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-B1#TRMPBF?
For technical support, including LTC2918IDDB-B1#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2918IDDB-B1#TRMPBF requirements.
6.How does Aetrix verify that LTC2918IDDB-B1#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC2918IDDB-B1#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-B1#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC2918IDDB-B1#TRMPBF?
All LTC2918IDDB-B1#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2918IDDB-B1#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-B1#TRMPBF part is unused and in its original packaging.
Return procedure for LTC2918IDDB-B1#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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