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Analog Devices Inc. LTC2918IMS-B1#TRPBF
- Part No.:
- LTC2918IMS-B1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC2918IMS-B1#TRPBF.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,345
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Product details
Overview
LTC2918IMS-B1#TRPBF 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 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 delivers 200ms internal reset timeout - used in automotive control systems for reliable power-on reset and microcontroller supervision.
For engineers reviewing the LTC2918IMS-B1#TRPBF datasheet, LTC2918IMS-B1#TRPBF pinout, LTC2918IMS-B1#TRPBF application, or LTC2918IMS-B1#TRPBF equivalent, this page provides verified functional specifications, validated pin-level circuit roles, confirmed B1-version windowed watchdog behavior, and real-world design meaning for reset timing, VM threshold selection, and MR push-button interface integration.
Technical Context
The LTC2918IMS-B1#TRPBF implements a dual-stage supervision architecture: a precision comparator monitors VM against one of nine factory-programmed thresholds selected via SEL1/SEL2 three-state inputs, while a windowed watchdog logic block validates WDI falling-edge periodicity between tWDL = 50ms and tWDU = 1.6s (B1 version). Its RST output is open-drain with guaranteed low-voltage operation down to VCC = 0.8V.
It integrates an internal 6.2V shunt regulator on VCC for high-voltage supply compatibility (e.g., 12V automotive rails), supports glitch-immune reset assertion via tUV = 10–150μs input filtering, and features MR with 100kΩ internal pull-up - enabling direct push-button interfacing without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | 1.5V to 5.5V - powers directly from logic rails; shunt regulation enables use with 12V supplies when series resistor applied. |
| Threshold Accuracy | ±1.5% over –40°C to 85°C - ensures reliable trip point margining outside system supply tolerance bands (e.g., 5V ±10%). |
| Reset Timeout | 200ms (internal, RT tied to VCC) - provides sufficient hold time for microcontroller initialization before release. |
| Watchdog Window | tWDL = 50ms / tWDU = 1.6s (B1 version) - enforces strict timing envelope to detect both stuck and excessively fast WDI toggling. |
| Quiescent Current | 30μA typical - enables long-term battery-backed monitoring in always-on automotive subsystems. |
| VM Input Impedance | 0.5–8MΩ - allows high-impedance resistive divider design for ADJ mode without loading error. |
| MR Input Logic | VIL ≤ 0.2×VCC, VIH ≥ 0.8×VCC with 100kΩ internal pull-up - supports direct connection to momentary switch to GND. |
Pinout & Package
10-Lead MSOP package (3mm × 3mm), exposed pad optional, rated for –40°C to 85°C operation. Pinout validated per LTC2918 MSOP top-view diagram (LTC2918IMS-B1#TRPBF datasheet pg. 2).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND | Ground reference | Primary return path for all internal circuits and RST sink current; must be low-impedance. |
| MR | Manual Reset input | Active-low input with internal 100kΩ pull-up; asserts RST for full tRST period when pulled low. |
| SEL2 | Threshold select bit | Three-state (VCC/GND/open) control pin selecting nominal VM threshold per Table 1; leakage ≤ ±5μA in open state. |
| SEL1 | Threshold select bit | Three-state control pin paired with SEL2 to configure one of nine thresholds including ADJ (0.5V). |
| VM | Monitor input | High-impedance comparator input; compares against selected threshold; supports external divider for ADJ mode. |
| RST | Open-drain reset output | Asserts low during fault or MR event; requires external pull-up; sinks ≥2.5mA at VCC = 3.3V, VOL ≤ 0.4V. |
| RT | Reset timeout control | Tied to VCC for 200ms internal timeout; capacitor to GND sets tRST = 9ms/nF; open = ~400μs. |
| WT | Watchdog timeout control | Tied to VCC for 1.6s internal windowed timeout; capacitor to GND sets tWDU = 72ms/nF; open = ~3.2ms. |
| WDI | Watchdog input | Falling-edge sensitive only (B1); must toggle within 50ms–1.6s window to prevent RST assertion. |
| VCC | Power supply input | Operates 1.5–5.5V; includes 6.2V shunt regulator for >5.7V supplies; bypass with 0.1μF ceramic capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Windowed watchdog (B1) | Enforces minimum and maximum WDI toggle interval (50ms–1.6s), preventing false resets from noise or software lockup. |
| Manual reset with internal pull-up | Eliminates external resistor for push-button interface; MR remains valid down to VCC = 0.8V. |
| 9-pin-selectable thresholds | Configures 12V/5V/3.3V/2.5V/1.8V/1.5V/1.2V/1.0V/ADJ(0.5V) without external resistors - reduces BOM count and layout area. |
| Guaranteed operation to 125°C (H-grade) | This IMS-B1 variant is rated –40°C to 85°C; H-grade versions support under-hood automotive environments. |
| Glitch-immune comparator | tUV = 10–150μs minimum pulse width required at VM to trigger RST - rejects transients from load switching or EMI. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC I/O Module |
|---|---|
Use Scenario: Monitors 5V microcontroller supply and 12V ignition rail in engine management system. IC Role / Device Role / Timing Role: Voltage supervisor with manual reset and windowed watchdog ensures deterministic boot sequence and detects firmware hangs during runtime. Use Value: ±1.5% threshold accuracy prevents nuisance resets during cold-cranking voltage dips; MR enables service-mode reinitialization without power cycle. |
Use Scenario: Supervises 3.3V FPGA configuration supply and 24V fieldbus interface in programmable logic controller. IC Role / Device Role / Timing Role: Dual-threshold monitor (VM + VCC UVLO) with 200ms reset hold guarantees FPGA configuration stability before logic release. Use Value: 30μA quiescent current enables always-on supervision in battery-backed backup modules; open-drain RST supports wired-OR with other supervisors. |
| Medical Infusion Pump Controller | Telecom Base Station Power Management |
Use Scenario: Validates 1.8V DSP core supply and triggers safety shutdown on undervoltage or watchdog timeout. IC Role / Device Role / Timing Role: Safety-critical supervisor with windowed watchdog (tWDL/tWDU) meets IEC 62304 Class C requirements for fault detection latency. Use Value: Guaranteed RST assertion at VCC ≥ 0.8V ensures fail-safe behavior during brownout; MR supports clinical recalibration without hardware disassembly. |
Use Scenario: Monitors 12V backplane supply and 5V processor rail in remote radio head unit with thermal derating. IC Role / Device Role / Timing Role: High-temp tolerant supervisor (–40°C to 85°C) with shunt-regulated VCC interface simplifies 12V-to-5V conversion. Use Value: 6.2V internal shunt regulator eliminates need for external LDO; adjustable RT/WT capacitors enable precise timing alignment with FPGA configuration sequence. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326US29D3+T | Fixed 2.93V threshold, no manual reset, no watchdog, SOT23-5 package | Suitable only for single-rail monitoring without system-level fault recovery | Select when simplicity and footprint minimization outweigh multi-threshold and watchdog needs. |
| TPS3808G33DBVR | Fixed 3.3V threshold, adjustable reset timeout (1.25ms–10s), no windowed watchdog, no MR | Lacks manual reset and windowed timing enforcement - insufficient for ASIL-B automotive compliance | Choose for cost-sensitive industrial applications requiring only basic reset delay tuning. |
Compared with MAX6326US29D3+T and TPS3808G33DBVR, the LTC2918IMS-B1#TRPBF uniquely combines 9 programmable thresholds, integrated manual reset, and B1-version windowed watchdog - making it the only option among the three qualified for high-reliability automotive and medical systems requiring multi-rail supervision and deterministic fault response.
Availability
LTC2918IMS-B1#TRPBF is available at Aetrix Electronics and suitable for automotive control systems, 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 LTC2918IMS-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. (acquired Linear Technology in 2017) designs high-performance analog, mixed-signal, and power management ICs for precision instrumentation, industrial automation, and automotive safety systems.
The LTC2918 belongs to Linear's precision voltage supervisor product line, engineered specifically for mission-critical power monitoring in automotive, medical, and industrial environments where deterministic reset behavior and robust fault detection are mandatory.
FAQ
What is the function of the MR pin on the LTC2918IMS-B1#TRPBF?
The MR (Manual Reset) pin on the LTC2918IMS-B1#TRPBF is an active-low input with an internal 100kΩ pull-up resistor to VCC. When pulled low, it forces the RST output low for the full reset timeout period (e.g., 200ms when RT = VCC), then releases RST high. This enables direct push-button reset functionality without external components - a key differentiator from the LTC2917 family. The LTC2918IMS-B1#TRPBF guarantees MR validity down to VCC = 0.8V.
How does the windowed watchdog feature work in the LTC2918IMS-B1#TRPBF?
The LTC2918IMS-B1#TRPBF implements a true windowed watchdog: WDI falling edges must occur strictly between tWDL = 50ms and tWDU = 1.6s (B1 version) to avoid RST assertion. Edges arriving too soon (<50ms) or too late (>1.6s) trigger reset. Unlike standard watchdogs, this prevents both software lockup and excessive toggling - critical for ASIL-B automotive compliance. The LTC2918IMS-B1#TRPBF ignores rising edges entirely; only falling edges are monitored.
Can the LTC2918IMS-B1#TRPBF monitor a 12V supply directly?
Yes - the LTC2918IMS-B1#TRPBF can monitor a 12V supply using its internal 6.2V shunt regulator on the VCC pin. A series current-limiting resistor (e.g., 11kΩ for 12V) must be placed between the 12V source and VCC to limit input current to ≤5mA. The VM pin then monitors the 12V rail directly (SEL1 = SEL2 = VCC), asserting RST if voltage drops below 11.22V (12V –5% ±1.5%). This eliminates need for external regulators in automotive applications.
What are the exact threshold voltages supported by the LTC2918IMS-B1#TRPBF?
The LTC2918IMS-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 fixed –5% tolerance and ±1.5% accuracy, actual trip points are tightly bounded - e.g., 5V threshold = 4.675V ±75mV (4.600V–4.750V) over –40°C to 85°C. Thresholds are selected exclusively via SEL1/SEL2 three-state inputs (VCC/GND/open); no external resistors needed. The LTC2918IMS-B1#TRPBF does not support –10% or –15% tolerances (only LTC2917 does).
How do I configure the LTC2918IMS-B1#TRPBF for a custom 2.8V supply monitor?
To monitor 2.8V with the LTC2918IMS-B1#TRPBF, use the ADJ (0.5V) mode: connect VM to a resistive divider between the 2.8V rail and GND, sized so VM = 0.5V at nominal 2.8V. Select R1 = 100kΩ (typical), then R2 = R1 × (2 × 2.8 – 1) ≈ 460kΩ. This yields a trip point of 2.8V ±6.5% (accounting for ±1.5% IC accuracy + –5% tolerance), ensuring reliable detection below 2.61V. The LTC2918IMS-B1#TRPBF's high-impedance VM input (0.5–8MΩ) minimizes divider current error.
LTC2918IMS-B1#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- 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-MSOP
LTC2918IMS-B1#TRPBF FAQ
1.How can I place an order for LTC2918IMS-B1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2918IMS-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 LTC2918IMS-B1#TRPBF reliable?
The price and inventory of LTC2918IMS-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 LTC2918IMS-B1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2918IMS-B1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2918IMS-B1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2918IMS-B1#TRPBF?
LTC2918IMS-B1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2918IMS-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 LTC2918IMS-B1#TRPBF?
For technical support, including LTC2918IMS-B1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2918IMS-B1#TRPBF requirements.
6.How does Aetrix verify that LTC2918IMS-B1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2918IMS-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 LTC2918IMS-B1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2918IMS-B1#TRPBF?
All LTC2918IMS-B1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2918IMS-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 LTC2918IMS-B1#TRPBF part is unused and in its original packaging.
Return procedure for LTC2918IMS-B1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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