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Analog Devices Inc. LTC2917IMS-B1#PBF
- Part No.:
- LTC2917IMS-B1#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC2917IMS-B1#PBF.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 10MSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LTC2917IMS-B1#PBF from Analog Devices (formerly Linear Technology) is a precision voltage supervisor IC with 27 selectable reset thresholds, windowed watchdog timer, and manual reset disable-designed for high-reliability power monitoring in automotive and industrial systems. It operates from 1.5V to 5.5V supply, consumes only 30μA quiescent current, guarantees ±1.5% threshold accuracy over –40°C to +85°C, and supports internal 200ms reset timeout and 1.6s/50ms windowed watchdog boundaries.
For engineers reviewing the LTC2917IMS-B1#PBF datasheet, LTC2917IMS-B1#PBF pinout, LTC2917IMS-B1#PBF application, or LTC2917IMS-B1#PBF equivalent, this page delivers verified functional identity, exact MSOP-10 pin mapping, confirmed B1-series windowed watchdog behavior, tolerance-selectable threshold architecture, and real-world timing parameters validated across temperature and supply conditions.
Technical Context
The LTC2917IMS-B1#PBF implements a dual-stage supervision architecture: a precision comparator monitors VM against one of nine nominal voltages (12V–0.5V ADJ) selected via SEL1/SEL2, with tolerance (–5%/–10%/–15%) set by TOL pin; its output triggers an adjustable reset timeout (internal 200ms or external capacitor). The B1 variant adds windowed watchdog logic that requires falling edges on WDI to occur strictly between tWDL = 50ms and tWDU = 1.6s-rejecting both too-fast and too-slow toggles.
It integrates a 6.2V shunt regulator on VCC for operation up to 12V supplies (with series resistor), guarantees RST assertion down to VCC ≥ 0.8V, and features glitch immunity with 10μs–150μs input rejection depending on magnitude-enabling robust operation in noisy automotive environments where supply transients are common.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | 1.5V to 5.5V direct operation; up to 12V with external series resistor and internal 6.2V shunt regulation |
| Reset Threshold Accuracy | ±1.5% over full temperature range (–40°C to +85°C), ensuring reliable trip point margining against supply tolerances |
| Quiescent Current | 30μA typical - enables always-on monitoring in battery-backed or low-power embedded systems |
| Internal Reset Timeout | 200ms (RT tied to VCC) - provides sufficient hold time for microcontroller initialization without external components |
| Windowed Watchdog Bounds | tWDL = 50ms / tWDU = 1.6s (B1 version) - enforces strict timing window to detect stalled or runaway firmware |
| VM Input Impedance | 0.5–8MΩ depending on SEL configuration - minimizes loading on monitored rail while supporting high-impedance divider designs |
| Operating Temperature | –40°C to +85°C (I-grade) - qualified for under-hood automotive control modules and industrial PLCs |
Pinout & Package
Package: 10-Lead MSOP (3mm × 3mm), RoHS-compliant, exposed pad optional (not electrically connected in MSOP).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND | Ground reference | Primary return path for all internal circuits and RST pull-down; must be low-impedance connection |
| TOL | Tolerance select input (three-state) | Configures VM threshold tolerance: VCC = –5%, open = –10%, GND = –15% - enables precise margin testing |
| SEL2 | Nominal voltage select input (three-state) | Together with SEL1, selects one of nine VM thresholds (e.g., SEL2=GND/SEL1=VCC → 3.3V); open/GND/VCC states define discrete settings |
| SEL1 | Nominal voltage select input (three-state) | Paired with SEL2 to encode 9 threshold options; no external resistors required - simplifies BOM and layout |
| VM | Monitored voltage input | High-impedance comparator input; accepts direct connection to supply rail or adjustable divider (ADJ mode = 0.5V reference) |
| RST | Open-drain reset output | Asserts low during undervoltage or watchdog fault; requires external pull-up; supports wired-OR with other supervisors |
| RT | Reset timeout control | Tie to VCC for 200ms internal timeout; leave open for ~400μs; add capacitor for 9ms/nF adjustable timing |
| WT | Watchdog timeout control | Tie to VCC for 1.6s internal upper bound (B1); add capacitor for 72ms/nF adjustment; tie to GND to disable |
| WDI | Watchdog input | Falling-edge sensitive (B1 only); must toggle within 50ms–1.6s window to prevent reset - detects software hangs |
| VCC | Power supply input | Accepts 1.5V–5.5V directly; >5.7V requires series resistor due to integrated 6.2V shunt regulator |
Key Features
| Feature | Design Value |
|---|---|
| 27 Selectable Thresholds | 9 nominal voltages × 3 tolerances (–5%/–10%/–15%) - eliminates need for external resistor networks and enables single-part support across multiple rail voltages |
| Windowed Watchdog (B1) | Enforces both minimum (50ms) and maximum (1.6s) watchdog toggle intervals - prevents false resets from noise while detecting frozen firmware |
| Glitch Immunity | Rejects transients <10μs at 5% over-threshold or <150μs at 0.1% over-threshold - ensures stable reset assertion in electrically noisy environments |
| Guaranteed RST at Low VCC | RST asserts reliably down to VCC = 0.8V - supports clean power-up sequencing even during brownout conditions |
| Shunt Regulator Integration | 6.2V internal shunt allows direct 12V battery operation with single series resistor - reduces external component count in automotive applications |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC Power Monitoring |
|---|---|
Use Scenario: Continuous monitoring of 5V microcontroller supply in under-hood ECU exposed to load dump and cold-crank transients. IC Role / Device Role / Timing Role: Voltage supervisor with windowed watchdog ensures MCU reset if firmware stalls or supply dips below 4.425V (5V–10%–1.5% accuracy). Use Value: Prevents unsafe operation during voltage sags or software lockup; 125°C-rated variants available for extended temp range. |
Use Scenario: Supervising 3.3V I/O rail in programmable logic controller with strict uptime requirements. IC Role / Device Role / Timing Role: Configured for 3.3V–10% threshold (VMT33 = 2.921V) with 200ms reset timeout and disabled watchdog for deterministic startup. Use Value: Eliminates need for external RC timing network; ±1.5% accuracy ensures reset occurs only outside specified rail tolerance. |
| Medical Infusion Pump Controller | Telecom Base Station Power Sequencing |
Use Scenario: Safety-critical monitoring of 1.8V FPGA core supply where spurious resets must be avoided. IC Role / Device Role / Timing Role: Uses ADJ mode with precision resistor divider to set exact 1.71V trip point (1.8V–5%–1.5%), leveraging ±1.5% accuracy guarantee. Use Value: Enables margin testing at production; glitch filtering rejects EMI-induced transients without compromising sensitivity. |
Use Scenario: Coordinating power-up of multiple 12V subsystems in 5G base station with synchronized reset release. IC Role / Device Role / Timing Role: Configured for 12V–5% threshold (VMT120 = 11.22V); RST outputs wired-OR to global reset bus. Use Value: Single-supervisor solution replaces multiple discrete comparators; MSOP-10 footprint saves board space in dense RF modules. |
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 selectable voltages or watchdog; 3-pin SOT23 package | Suitable only for single-rail monitoring; lacks windowed watchdog and multi-threshold flexibility | Select when cost and size are primary constraints and only one fixed threshold is needed |
| TPS3808G33DBVR | Fixed 3.3V threshold, adjustable watchdog (non-windowed), 6-pin SOT23; 1.8–6V supply | No tolerance selection or multi-voltage support; lower quiescent current (1.5μA) but no shunt regulator | Prefer for ultra-low-power battery applications where 3.3V-only supervision suffices |
Compared with MAX6326US29D3+T and TPS3808G33DBVR, the LTC2917IMS-B1#PBF offers unique configurability across 27 thresholds, integrated windowed watchdog for safety-critical firmware validation, and 6.2V shunt capability for direct 12V operation-making it optimal for complex, multi-rail automotive and industrial systems requiring design reuse and field-programmable margining.
Availability
LTC2917IMS-B1#PBF is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLCs, medical infusion pump controllers, and telecom base station power sequencing requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LTC2917IMS-B1#PBF 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 (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, automotive, industrial, and communications markets.
The LTC2917 family was designed specifically for high-reliability power supervision in harsh environments-emphasizing guaranteed accuracy over temperature, glitch immunity, and flexible timing to replace discrete reset circuits in safety-critical systems.
FAQ
What is the key functional difference between LTC2917IMS-B1#PBF and LTC2917IMS-A1#PBF?
The LTC2917IMS-B1#PBF implements a windowed watchdog timer requiring WDI falling edges to occur strictly between 50ms and 1.6s, whereas the A1 version uses a standard single-boundary watchdog (only upper limit enforced). This makes the B1 variant suitable for ASIL-B/C automotive applications where detection of both too-fast and too-slow firmware activity is required. Both share identical threshold selection, reset timing, and package.
Can LTC2917IMS-B1#PBF monitor a 12V supply directly without external components?
No - the LTC2917IMS-B1#PBF has a 5.7V absolute maximum VCC rating. To monitor 12V, connect it through a series current-limiting resistor to leverage the internal 6.2V shunt regulator. For example, with a 12V source, a 11kΩ resistor limits VCC current to ~570μA, keeping dissipation within safe limits while maintaining regulation at 6.2V.
How does the TOL pin affect threshold accuracy in LTC2917IMS-B1#PBF?
The TOL pin selects the tolerance band applied to the nominal threshold (–5%, –10%, or –15%). Threshold accuracy remains ±1.5% of the nominal voltage regardless of TOL setting - e.g., for 5V nominal with TOL = GND (–15%), the actual trip range is 4.175V to 4.250V (5V × 0.85 × 0.985 to 5V × 0.85 × 1.015). This enables precise margin testing against supply specifications.
What is the minimum pulse width required on WDI for reliable watchdog operation in LTC2917IMS-B1#PBF?
The LTC2917IMS-B1#PBF requires a minimum WDI pulse width of 400ns for falling-edge detection. This specification ensures compatibility with standard microcontroller GPIO toggle speeds while rejecting sub-400ns noise spikes. The falling edge must also fall within the 50ms–1.6s window relative to the prior edge to avoid triggering RST.
Does LTC2917IMS-B1#PBF support adjustable reset timeout using an external capacitor?
Yes - connecting a capacitor (CRT) from RT to GND sets the reset timeout per the formula CRT = tRST × 110 pF/ms. For example, a 2.2nF capacitor yields ~20ms timeout. Leaving RT open gives ~400μs; tying RT to VCC selects the internal 200ms timeout. All configurations maintain ±1.5% timing accuracy over temperature.
LTC2917IMS-B1#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- 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
LTC2917IMS-B1#PBF FAQ
1.How can I place an order for LTC2917IMS-B1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2917IMS-B1#PBF 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 LTC2917IMS-B1#PBF reliable?
The price and inventory of LTC2917IMS-B1#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2917IMS-B1#PBF is usually 5 days.
3.What payment methods are accepted for LTC2917IMS-B1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2917IMS-B1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2917IMS-B1#PBF?
LTC2917IMS-B1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2917IMS-B1#PBF 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 LTC2917IMS-B1#PBF?
For technical support, including LTC2917IMS-B1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2917IMS-B1#PBF requirements.
6.How does Aetrix verify that LTC2917IMS-B1#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2917IMS-B1#PBF 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 LTC2917IMS-B1#PBF meets industry standards.
7.What is the process for return or replacement of LTC2917IMS-B1#PBF?
All LTC2917IMS-B1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2917IMS-B1#PBF, 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 LTC2917IMS-B1#PBF part is unused and in its original packaging.
Return procedure for LTC2917IMS-B1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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