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Analog Devices Inc. LTC2918IDDB-B1#TRPBF
- Part No.:
- LTC2918IDDB-B1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC2918IDDB-B1#TRPBF.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,129
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Product details
Overview
LTC2918IDDB-B1#TRPBF from Analog Devices (formerly Linear Technology) is a precision voltage supervisor IC with 9 selectable supply thresholds, fixed –5% tolerance, manual reset input, and windowed 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 supports automotive-grade reliability in a 10-lead DFN package. It is used for reliable power-up/power-down sequencing and fault recovery in microprocessor-based systems.
For engineers reviewing the LTC2918IDDB-B1#TRPBF datasheet, LTC2918IDDB-B1#TRPBF pinout, LTC2918IDDB-B1#TRPBF application, or LTC2918IDDB-B1#TRPBF equivalent, key selection criteria include its B1 version's windowed watchdog (tWDL = 50ms, tWDU = 1.6s), MR pin compatibility with push-button interfaces, internal 200ms reset timeout, guaranteed RST assertion down to VCC ≥ 0.8V, and operation up to 125°C junction temperature.
Technical Context
The LTC2918IDDB-B1#TRPBF implements a dual-stage supervision architecture: a high-accuracy comparator monitors VM against one of nine factory-programmed thresholds selected by SEL1/SEL2, while a dedicated windowed watchdog logic block validates WDI falling-edge timing between lower (50ms) and upper (1.6s) boundaries. Its internal 6.2V shunt regulator enables direct 12V supply operation when paired with an external series resistor.
It features glitch-immune reset generation via combined anti-glitch circuitry (tUV ≤ 150μs) and programmable reset timeout (internal 200ms or external capacitor-adjustable), plus open-drain RST output with VOL ≤ 0.2V at 15μA and guaranteed release above VCC = 0.8V. The MR input includes a 100kΩ internal pull-up and accepts logic-level signals referenced to VCC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | 1.5V to 5.5V; supports direct low-voltage rail monitoring without external regulation |
| Threshold Accuracy | ±1.5% over –40°C to 85°C; ensures reliable trip point margining against supply tolerances |
| Watchdog Type | Windowed (B1 version); requires WDI falling edges within 50ms–1.6s interval to prevent false reset |
| Reset Timeout | 200ms (internal, RT tied to VCC); eliminates need for external timing capacitor in basic applications |
| Quiescent Current | 30μA typical; enables long-battery-life supervision in portable and IoT edge devices |
| Operating Temp | –40°C to 85°C (I-grade); qualified for industrial and extended-temperature embedded control |
| VCC Undervoltage Lockout | 1.5V max; guarantees functional reset assertion during brown-out conditions |
Pinout & Package
Package: 10-lead (3mm × 2mm) plastic DFN with exposed pad (pin 11, optional GND connection). Pin count and layout match MSOP-10 but with reduced footprint and improved thermal performance (θJA = 43°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference | Primary return path for all internal circuits; must be low-impedance connection to system ground plane |
| MR (Pin 2) | Manual reset input | Active-low push-button interface; internally pulled up to VCC (100kΩ), no external components required |
| SEL2 (Pin 3) | Threshold select | Three-state input (VCC/GND/open) that, with SEL1, selects one of nine nominal VM thresholds (e.g., 1.8V, 3.3V) |
| SEL1 (Pin 4) | Threshold select | Three-state input that pairs with SEL2 to configure VM trip point; open-circuit leakage ≤ ±5μA |
| VM (Pin 5) | Monitor input | High-impedance comparator input; senses supply voltage directly or via external resistive divider for ADJ mode |
| RST (Pin 6) | Reset output | Open-drain output requiring external pull-up; asserts low on threshold violation or MR activation |
| RT (Pin 7) | Reset timeout control | Connect to VCC for 200ms internal timeout; leave open for ~400μs; add capacitor for adjustable delay |
| WT (Pin 8) | Watchdog timeout control | Tie to VCC for 1.6s windowed timeout (B1); connect capacitor for extended timing; tie to GND to disable |
| WDI (Pin 9) | Watchdog input | Falling-edge-sensitive input; only falling edges counted for windowed watchdog validation in B1 version |
| VCC (Pin 10) | Power supply | Input for 1.5–5.5V operation; includes internal 6.2V shunt regulator for >5.7V supplies with series resistor |
Key Features
| Feature | Design Value |
|---|---|
| 9 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) rails without external resistors |
| Fixed –5% Tolerance | Eliminates TOL pin complexity vs. LTC2917; simplifies design for standard 5% supply tolerance applications |
| Windowed Watchdog (B1) | Prevents system lockup from stuck or oscillating WDI signals by enforcing both minimum and maximum timing windows |
| Manual Reset Input | Direct push-button interface with integrated 100kΩ pull-up; removes need for external RC network or logic buffer |
| Guaranteed RST at VCC ≥ 0.8V | Ensures valid reset assertion during deep brown-out, supporting robust power-fail detection in battery-powered systems |
Applications
| Microprocessor Power Sequencing | Automotive Body Control Module |
|---|---|
Use Scenario: Coordinating power-up order of CPU, memory, and peripherals in an embedded controller. IC Role / Device Role / Timing Role: Voltage supervisor asserting RST until core supply stabilizes, then enabling clock and I/O initialization. Use Value: Prevents firmware execution before stable VCC and VM; 200ms internal timeout matches typical processor boot readiness. | Use Scenario: Monitoring 12V battery rail and 5V MCU supply in vehicle door module under load dump and cold-crank conditions. IC Role / Device Role / Timing Role: Dual-rail supervision with windowed watchdog validating MCU heartbeat during CAN communication. Use Value: ±1.5% threshold accuracy ensures reset at true 11.4V (12V × –5%) even at 85°C; shunt regulator enables direct 12V connection. |
| Industrial PLC I/O Card | Optical Transceiver Line Card |
Use Scenario: Ensuring safe startup of FPGA-configured I/O drivers after 3.3V and 1.8V rails reach regulation. IC Role / Device Role / Timing Role: Simultaneous monitoring of multiple rails using SEL1/SEL2 configuration and manual reset for field service recovery. Use Value: MR pin allows technician-initiated reconfiguration without power cycle; 30μA ICC minimizes standby power impact. | Use Scenario: Supervising +3.3V bias supply and –5% tolerance 1.8V logic rail in SFP+ module with strict thermal constraints. IC Role / Device Role / Timing Role: Compact DFN package fits tight board space; windowed watchdog detects firmware hangs during optical calibration routines. Use Value: 3mm × 2mm DFN reduces footprint vs. MSOP; tWDL = 50ms/tWDU = 1.6s window prevents false resets from transient noise on WDI line. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326US29D3+ | Single 2.93V fixed threshold; no selectable thresholds, no watchdog, no MR pin; SOT23-3 package | Suitable only for basic 2.93V rail monitoring; lacks flexibility for multi-rail or safety-critical systems | Select when cost and size are primary concerns and only one fixed threshold is needed |
| TPS3808G33DBVR | 3.3V fixed threshold; adjustable watchdog (non-windowed); no MR pin; 5-pin SOT23 | Supports watchdog timeout adjustment but cannot detect too-fast WDI toggling; no manual reset capability | Choose for simple 3.3V monitoring with basic watchdog where windowed timing is unnecessary |
Compared with MAX6326US29D3+ and TPS3808G33DBVR, the LTC2918IDDB-B1#TRPBF provides superior design flexibility through 9 programmable thresholds, integrated manual reset, and B1-series windowed watchdog-critical for automotive and industrial systems requiring deterministic fault recovery without PCB layout changes.
Availability
LTC2918IDDB-B1#TRPBF is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC I/O cards, optical transceiver line cards, and microprocessor power sequencing applications requiring stable component supply across extended temperature ranges.
Supply support for LTC2918IDDB-B1#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, 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 monitoring product line, designed specifically for high-reliability embedded systems requiring accurate voltage supervision, deterministic watchdog behavior, and robust operation across automotive and industrial temperature grades.
FAQ
What is the function of the MR pin on the LTC2918IDDB-B1#TRPBF?
The MR (Manual Reset) pin on the LTC2918IDDB-B1#TRPBF is an active-low input with an internal 100kΩ pull-up resistor to VCC, enabling direct interface with a momentary push button without external components. When asserted low while RST is high, it initiates a full reset cycle: RST is driven low for the configured timeout period (e.g., 200ms if RT = VCC), then released. This feature is exclusive to the LTC2918 family and not present in the LTC2917.
How does the windowed watchdog in the LTC2918IDDB-B1#TRPBF differ from standard watchdog timers?
The windowed watchdog in the LTC2918IDDB-B1#TRPBF requires WDI falling edges to occur strictly between a lower boundary (tWDL = 50ms) and upper boundary (tWDU = 1.6s); edges outside this window trigger RST assertion. Unlike standard watchdogs that only enforce a maximum timeout, this prevents false resets from noise or software lockups that cause excessively fast or slow toggling. The LTC2918IDDB-B1#TRPBF implements this using only falling edges on WDI, as specified for B1 versions.
Can the LTC2918IDDB-B1#TRPBF monitor a 12V supply directly?
Yes, the LTC2918IDDB-B1#TRPBF 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 automotive use) must be placed between the 12V source and VCC to limit input current to ≤5mA. The VM pin is then connected to the 12V rail (or a scaled version), and SEL1/SEL2 configured for 12V threshold. This eliminates need for external LDO or regulator in high-voltage supervision applications.
What are the exact threshold voltages supported by the LTC2918IDDB-B1#TRPBF?
The LTC2918IDDB-B1#TRPBF supports nine nominal thresholds: 12V, 5V, 3.3V, 2.5V, 1.8V, 1.5V, 1.2V, 1.0V, and ADJ (0.5V). With its fixed –5% tolerance, actual trip points are 11.4V, 4.75V, 3.135V, 2.375V, 1.71V, 1.425V, 1.14V, 0.95V, and 0.475V respectively, all guaranteed within ±1.5% over temperature. These values are factory-programmed and require no external resistors.
Does the LTC2918IDDB-B1#TRPBF require external capacitors for basic operation?
No, the LTC2918IDDB-B1#TRPBF operates fully functional without external capacitors for basic supervision. A 0.1μF ceramic bypass capacitor on VCC is recommended but not mandatory for stability. RT and WT pins default to internal 200ms reset and 1.6s watchdog timeouts when tied to VCC-no timing capacitors needed. External capacitors (CRT, CWT) are optional for custom timeout values, and the MR pin needs no external components due to its internal pull-up.
LTC2918IDDB-B1#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-B1#TRPBF FAQ
1.How can I place an order for LTC2918IDDB-B1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2918IDDB-B1#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-B1#TRPBF reliable?
The price and inventory of LTC2918IDDB-B1#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-B1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2918IDDB-B1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2918IDDB-B1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2918IDDB-B1#TRPBF?
LTC2918IDDB-B1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2918IDDB-B1#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-B1#TRPBF?
For technical support, including LTC2918IDDB-B1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2918IDDB-B1#TRPBF requirements.
6.How does Aetrix verify that LTC2918IDDB-B1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2918IDDB-B1#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-B1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2918IDDB-B1#TRPBF?
All LTC2918IDDB-B1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2918IDDB-B1#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-B1#TRPBF part is unused and in its original packaging.
Return procedure for LTC2918IDDB-B1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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