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Analog Devices Inc. LTC2918HDDB-B1#TRMPBF
- Part No.:
- LTC2918HDDB-B1#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC2918HDDB-B1#TRMPBF.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:514
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Product details
Overview
LTC2918HDDB-B1#TRMPBF from Analog Devices (formerly Linear Technology) is a high-temperature 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 125°C, and supports automotive control systems requiring robust power monitoring.
For engineers reviewing the LTC2918HDDB-B1#TRMPBF datasheet, LTC2918HDDB-B1#TRMPBF pinout, LTC2918HDDB-B1#TRMPBF application, or LTC2918HDDB-B1#TRMPBF equivalent, key selection criteria include its B1 version's windowed watchdog (tWDL = 50ms / tWDU = 1.6s), MR pin for push-button reset, DFN-10 (3mm × 2mm) package rated to 125°C, and guaranteed RST assertion down to VCC ≥ 0.8V.
Technical Context
The LTC2918HDDB-B1#TRMPBF implements a dual-stage supervision architecture: a precision comparator monitors VM against one of nine internally programmed thresholds selected via SEL1/SEL2 three-state inputs, while a windowed watchdog logic block validates WDI falling-edge timing between lower (tWDL) and upper (tWDU) boundaries. Its internal 6.2V shunt regulator enables operation from supplies up to 12V when used with an external series resistor.
Reset timeout (tRST) and watchdog timeout are configurable via RT and WT pins-internally set to ~200ms and ~1.6s respectively when tied to VCC, or externally adjusted using capacitors (CRT, CWT). The MR pin features a 100kΩ internal pull-up and triggers a full reset cycle upon low assertion, independent of VM or watchdog state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | 1.5V to 5.5V direct operation; up to 12V via internal 6.2V shunt regulator with external current-limiting resistor |
| Threshold Accuracy | ±1.5% over full –40°C to 125°C range - ensures reliable trip point margining against supply tolerances |
| Quiescent Current | 30μA typical - enables long-life battery-backed or low-power embedded monitoring |
| Reset Timeout (tRST) | 200ms internal default (RT = VCC) - provides sufficient hold time for microcontroller initialization |
| Watchdog Window (B1) | tWDL = 50ms / tWDU = 1.6s - enforces strict timing compliance to detect firmware lockup or slow execution |
| RST Output Type | Open-drain - allows wired-OR connection with other supervisors and flexible pull-up to any logic rail ≤ 6V |
| VM Input Impedance | 0.5–8MΩ - minimizes loading on monitored supply; supports high-impedance resistive dividers for ADJ mode |
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 100kΩ internal pull-up - directly interfaces to momentary switch without external components |
| SEL2 / SEL1 | Threshold select inputs | Three-state (VCC/GND/open) pins selecting one of nine nominal VM thresholds (e.g., 1.8V, 3.3V, 5V) |
| VM | Voltage monitor input | High-impedance comparator input - connects to supply rail or resistive divider for adjustable threshold (ADJ = 0.5V) |
| RST | Reset output | Open-drain output asserted low during fault or reset timeout - requires external pull-up resistor |
| RT | Reset timeout control | Capacitor-connected pin setting tRST = 9ms/nF; tied to VCC for 200ms fixed timeout |
| WT | Watchdog timeout control | Capacitor-connected pin setting tWDU = 72ms/nF; tied to VCC for 1.6s fixed windowed timeout |
| WDI | Watchdog input | Falling-edge sensitive input - must toggle within tWDL–tWDU window to prevent RST assertion |
| VCC | Power supply input | Accepts 1.5–5.5V directly; >5.7V requires series resistor due to integrated 6.2V shunt regulator |
Key Features
| Feature | Design Value |
|---|---|
| Windowed watchdog (B1 version) | Enforces both minimum and maximum WDI edge intervals (50ms–1.6s), eliminating false resets from slow or stalled firmware |
| Manual reset with internal pull-up | Eliminates need for external pull-up resistor - simplifies PCB layout and reduces BOM count for push-button interface |
| Guaranteed operation to 125°C | Validated for under-hood automotive applications and industrial environments where ambient temperature exceeds 85°C |
| Glitch-immune reset detection | Combines 10–150μs input glitch rejection (tUV) with programmable timeout to suppress transients without sacrificing threshold accuracy |
| 9-pin-selectable thresholds | Supports common rails (1.8V, 2.5V, 3.3V, 5V, 12V) and adjustable mode (ADJ = 0.5V) - eliminates external resistor networks |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC I/O Module |
|---|---|
Use Scenario: Monitoring 5V microcontroller supply in engine bay where temperature cycles from –40°C to 125°C and load transients induce sub-100μs voltage glitches. IC Role / Device Role / Timing Role: Voltage supervisor asserting RST low if VM drops below 4.75V (5V–5%) for >200ms; windowed watchdog validates MCU heartbeat within 50ms–1.6s window. Use Value: Prevents spurious resets from thermal drift or noise while ensuring deterministic recovery from firmware hangs - critical for ASIL-B functional safety compliance. | Use Scenario: Supervising isolated 3.3V logic rail powering analog input circuitry in a factory-floor programmable logic controller with 24/7 uptime requirements. IC Role / Device Role / Timing Role: Detects undervoltage on 3.3V rail (trip at 3.135V) and holds RST low for 200ms after recovery; MR pin enables field-service reset without power cycling. Use Value: Maintains system integrity during brownouts and allows maintenance personnel to initiate controlled restart - reducing unplanned downtime. |
| Medical Infusion Pump Controller | Telecom Base Station Power Management |
Use Scenario: Ensuring safe operation of battery-powered infusion pump MCU by monitoring 1.8V core supply during deep discharge and ESD events. IC Role / Device Role / Timing Role: Guarantees RST assertion down to VCC = 0.8V; uses ADJ mode with resistive divider to precisely set 1.71V (1.8V–5%) threshold for low-voltage cutoff. Use Value: Enables fail-safe shutdown before battery depletion causes erratic motor control - meeting IEC 60601-1 leakage and reliability requirements. | Use Scenario: Supervising multiple distributed 12V DC-DC converter outputs in a 4G/LTE base station cabinet with wide ambient temperature swings. IC Role / Device Role / Timing Role: Configured for 12V monitoring (SEL1=VCC, SEL2=VCC); leverages internal 6.2V shunt regulator to operate directly from 12V rail without LDO. Use Value: Reduces component count and board space versus discrete supervisor + regulator solutions - improving thermal performance and MTBF. |
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 windowed watchdog; SOT23-3 package | Suitable only for single-rail monitoring without timing flexibility or user-initiated reset | Select when cost and footprint are primary constraints and multi-threshold/windowed watchdog features are unnecessary |
| TPS3808G33DBVR | Fixed 3.3V threshold; adjustable reset timeout only; no watchdog; no MR pin; SOT23-6 | Lacks windowed watchdog and manual reset - limited to basic power-on reset scenarios | Choose for simple 3.3V rail monitoring where extended timing control suffices and BOM simplicity is critical |
Compared with MAX6326UT29D3+T and TPS3808G33DBVR, the LTC2918HDDB-B1#TRMPBF offers unique value in high-reliability systems requiring field-service reset capability, multi-rail adaptability via pin-selectable thresholds, and deterministic failure detection through windowed watchdog timing - all in a compact DFN package qualified to 125°C.
Availability
LTC2918HDDB-B1#TRMPBF is available at Aetrix Electronics and suitable for automotive control units, industrial PLCs, medical infusion pumps, and telecom base stations requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC2918HDDB-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 semiconductors, acquired Linear Technology in 2017 to strengthen its power management and precision analog portfolio.
The LTC2918 belongs to ADI's high-reliability power supervision product line, designed specifically for automotive, industrial, and medical applications demanding guaranteed operation to 125°C, ±1.5% threshold accuracy, and advanced watchdog functionality.
FAQ
What is the operating temperature range of the LTC2918HDDB-B1#TRMPBF?
The LTC2918HDDB-B1#TRMPBF is specified for operation from –40°C to +125°C, making it suitable for under-hood automotive applications and high-temperature industrial environments. This rating is validated per the H-grade qualification standard and includes full electrical performance guarantees across the entire range, including ±1.5% threshold accuracy and 30μA typical quiescent current.
Does the LTC2918HDDB-B1#TRMPBF support windowed watchdog functionality?
Yes, the LTC2918HDDB-B1#TRMPBF is the B1 version of the LTC2918 family and explicitly supports windowed watchdog operation. It requires WDI falling edges to occur strictly between tWDL = 50ms and tWDU = 1.6s (when WT = VCC); violation of either boundary asserts RST low for the configured reset timeout period.
How does the manual reset (MR) pin function on the LTC2918HDDB-B1#TRMPBF?
The MR pin on the LTC2918HDDB-B1#TRMPBF is an active-low input with a 100kΩ internal pull-up resistor. Asserting MR low (e.g., via push button to GND) initiates a full reset cycle: RST goes low immediately and remains low for the full reset timeout period (e.g., 200ms if RT = VCC), regardless of VM or watchdog status. This enables field-service recovery without power interruption.
Can the LTC2918HDDB-B1#TRMPBF monitor a 12V supply directly?
Yes, the LTC2918HDDB-B1#TRMPBF can monitor a 12V supply using its internal 6.2V shunt regulator on the VCC pin. A series current-limiting resistor (e.g., 11kΩ) must be placed between the 12V source and VCC to limit input current to ≤5mA. SEL1 and SEL2 are set to VCC to select the 12V nominal threshold, and the device asserts RST if VM falls below 11.4V (12V–5%).
What is the minimum VCC voltage required for reliable RST assertion in the LTC2918HDDB-B1#TRMPBF?
The LTC2918HDDB-B1#TRMPBF guarantees RST assertion for VCC ≥ 0.8V, enabling robust reset generation even during deep brownout conditions. Below 0.8V, RST behavior is not specified. For accurate threshold monitoring, VCC must exceed the 1.5V undervoltage lockout level - RST remains low until both VCC > 1.5V and VM > programmed threshold.
LTC2918HDDB-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 ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x2)
LTC2918HDDB-B1#TRMPBF FAQ
1.How can I place an order for LTC2918HDDB-B1#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2918HDDB-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 LTC2918HDDB-B1#TRMPBF reliable?
The price and inventory of LTC2918HDDB-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 LTC2918HDDB-B1#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC2918HDDB-B1#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2918HDDB-B1#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2918HDDB-B1#TRMPBF?
LTC2918HDDB-B1#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2918HDDB-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 LTC2918HDDB-B1#TRMPBF?
For technical support, including LTC2918HDDB-B1#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2918HDDB-B1#TRMPBF requirements.
6.How does Aetrix verify that LTC2918HDDB-B1#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC2918HDDB-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 LTC2918HDDB-B1#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC2918HDDB-B1#TRMPBF?
All LTC2918HDDB-B1#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2918HDDB-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 LTC2918HDDB-B1#TRMPBF part is unused and in its original packaging.
Return procedure for LTC2918HDDB-B1#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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