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Analog Devices Inc. LTC2917CMS-B1#TRPBF
- Part No.:
- LTC2917CMS-B1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC2917CMS-B1#TRPBF.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,751
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Product details
Overview
LTC2917CMS-B1#TRPBF from Analog Devices (formerly Linear Technology) is a precision voltage supervisor IC with 27 selectable reset thresholds, integrated windowed watchdog timer, and manual reset capability disabled - 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 1.8V system monitoring with 200ms internal reset timeout.
For engineers reviewing the LTC2917CMS-B1#TRPBF datasheet, LTC2917CMS-B1#TRPBF pinout, LTC2917CMS-B1#TRPBF application, or LTC2917CMS-B1#TRPBF equivalent, this page delivers verified functional identity, exact MSOP-10 pin mapping, confirmed B1-version windowed watchdog behavior, tolerance-selectable threshold logic, and real-world timing parameters - all validated against Linear Technology's official LTC2917/LTC2918 datasheet (29178fb).
Technical Context
The LTC2917CMS-B1#TRPBF 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 - all guaranteed ±1.5% over temperature. Its B1 variant adds windowed watchdog functionality requiring falling-edge WDI pulses within both upper (1.6s internal) and lower (50ms internal) time boundaries to prevent false resets.
Reset assertion is open-drain RST with glitch immunity down to 10μs at 5% threshold deviation; RT and WT pins support capacitor-adjustable timeouts (9ms/nF and 72ms/nF scaling), while VCC includes a 6.2V shunt regulator enabling operation up to 12V supplies with external current-limiting resistor.
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 regulator |
| 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 |
| Reset Timeout | 200ms internal (RT tied to VCC); adjustable from 400μs (RT open) to >20ms (external CRT) |
| Watchdog Type | Windowed (B1 version): requires falling-edge WDI pulses between 50ms (tWDL) and 1.6s (tWDU) to avoid reset assertion |
| Operating Temp | –40°C to +85°C (I-grade), qualified for automotive control modules and industrial PLCs |
| VM Input Impedance | 0.5–8MΩ depending on SEL configuration - supports high-impedance divider networks for ADJ mode |
Pinout & Package
Package: 10-Lead MSOP (3mm × 3mm), RoHS-compliant, lead-free finish. Exposed pad optional for thermal enhancement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND | Ground reference | Primary return path for all internal circuitry and external bypass capacitors |
| TOL | Tolerance select input (three-state) | Sets monitored supply tolerance: VCC = –5%, open = –10%, GND = –15% - only active in LTC2917 variants |
| SEL2 | Nominal threshold select (three-state) | Combines with SEL1 to choose one of nine VM monitor voltages (e.g., SEL2=GND/SEL1=VCC → 3.3V) |
| SEL1 | Nominal threshold select (three-state) | Primary threshold selection bit; open/GND/VCC states define 9-voltage matrix per Table 1 |
| VM | Voltage monitor input | High-impedance comparator input; threshold determined by SEL1/SEL2/TOL or external divider in ADJ mode |
| RST | Open-drain reset output | Asserts low when VM < threshold; held low for tRST after recovery; supports wired-OR with other supervisors |
| RT | Reset timeout control | Capacitor-to-GND sets tRST = 9ms/nF; tied to VCC = 200ms; open = 400μs |
| WT | Watchdog timeout control | Capacitor-to-GND sets tWDU = 72ms/nF; tied to VCC = 1.6s; open = 3.2ms; GND disables watchdog |
| WDI | Watchdog input | Falling-edge sensitive (B1 version); must pulse within tWDL–tWDU window to prevent RST assertion |
| VCC | Power supply input | 1.5–5.5V direct operation; >5.7V requires series resistor due to internal 6.2V shunt regulator |
Key Features
| Feature | Design Value |
|---|---|
| 27 Selectable Thresholds | Nine nominal voltages × three tolerances (–5%/–10%/–15%) - eliminates external resistor networks for flexible supply monitoring |
| Windowed Watchdog (B1) | Prevents spurious resets by enforcing both minimum (50ms) and maximum (1.6s) WDI pulse intervals - critical for safety-critical firmware validation |
| Glitch Immunity | 10μs minimum pulse width required at 5% threshold deviation - rejects noise-induced transients without compromising DC accuracy |
| Adjustable ADJ Mode | 0.5V internal reference enables custom trip points via external resistive divider (e.g., 9V @ –15% = 7.65V → R1/R2 = 51.1k/866k) |
| 125°C Capable Design | Guaranteed operation to 125°C (H-grade variants); I-grade LTC2917CMS-B1#TRPBF qualified to 85°C with same architecture and pinout |
| Shunt Regulator Integration | 6.2V VCC shunt allows direct 12V automotive battery interface with single series resistor - no external LDO needed |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC Power Sequencing |
|---|---|
Use Scenario: Monitoring 5V microcontroller supply in under-hood ECU exposed to wide temperature swings and load dump transients. IC Role / Device Role / Timing Role: Voltage supervisor with –10% tolerance (SEL1=open, SEL2=GND, TOL=open) and 200ms reset hold time (RT=VCC) ensures clean boot after cold crank. Use Value: ±1.5% threshold accuracy prevents nuisance resets during 12V battery sag to 9V; windowed watchdog validates firmware execution every 1.6s. |
Use Scenario: Coordinating power-up sequence of FPGA, ADC, and communication ICs in modular I/O rack. IC Role / Device Role / Timing Role: Supervises 3.3V rail (SEL1=VCC, SEL2=GND) with 20ms external reset timeout (CRT=2.2nF) and disabled watchdog (WT=GND) for deterministic initialization. Use Value: 30μA quiescent current enables always-on monitoring; 0.5–8MΩ VM impedance minimizes loading on precision reference rails. |
| Medical Infusion Pump Controller | Telecom Base Station Power Management |
Use Scenario: Ensuring safe shutdown when 1.8V DSP core supply drops below specification during battery transition. IC Role / Device Role / Timing Role: Configured for 1.8V/–5% threshold (SEL1=open, SEL2=open, TOL=VCC); RST asserts within 10μs of undervoltage detection. Use Value: Guaranteed RST assertion down to VCC ≥ 0.8V enables fail-safe behavior even during brownout; glitch filtering rejects EMI from motor drivers. |
Use Scenario: Monitoring 12V backplane supply in 48V-powered base station with transient protection. IC Role / Device Role / Timing Role: Uses VCC shunt regulator (RCC=11kΩ) to derive 3.3V logic from 12V rail; SEL1=SEL2=VCC selects 12V threshold with –5% tolerance. Use Value: Eliminates need for discrete 12V LDO; 6.2V shunt regulator handles 60V load dump spikes with proper RCC sizing per datasheet Equation. |
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; SOT23-3 package | Limited to single-rail monitoring; lacks windowed watchdog and multi-threshold flexibility | Select when only basic 2.93V supervision is required and board space is constrained |
| TPS3808G33DBVR | Fixed 3.3V threshold; adjustable watchdog (non-windowed); 6-pin SOT23 | No tolerance selection or VM adjustability; lower quiescent current (1.5μA) but no shunt regulator | Choose for ultra-low-power 3.3V-only systems where external 12V interface is handled separately |
Compared with MAX6326US29D3+T and TPS3808G33DBVR, the LTC2917CMS-B1#TRPBF provides unique configurability across 27 thresholds, integrated windowed watchdog for ASIL-B–capable systems, and 12V-compatible shunt regulation - making it irreplaceable in multi-rail automotive and industrial designs requiring field-programmable supervision.
Availability
LTC2917CMS-B1#TRPBF is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLCs, medical infusion pump controllers, and telecom base station power management requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC2917CMS-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) acquired Linear Technology in 2017 and maintains its high-performance analog portfolio, including precision supervisors, data converters, and power management ICs for mission-critical applications.
The LTC2917 series was designed specifically for automotive and industrial systems demanding guaranteed threshold accuracy, windowed watchdog reliability, and wide-temperature operation - addressing the need for deterministic power sequencing in safety-aware embedded environments.
FAQ
What is the function of the TOL pin on the LTC2917CMS-B1#TRPBF?
The TOL pin on the LTC2917CMS-B1#TRPBF selects the tolerance band for the monitored supply: VCC = –5%, open = –10%, GND = –15%. This enables precise margining against supply specifications - for example, monitoring a 5V±10% rail using the –10% setting ensures reset occurs only below 4.5V, avoiding nuisance trips within normal operating range. The LTC2917CMS-B1#TRPBF implements this feature as part of its 27-threshold architecture.
Does the LTC2917CMS-B1#TRPBF support windowed watchdog functionality?
Yes, the LTC2917CMS-B1#TRPBF is a B1-version device and fully supports windowed watchdog operation: WDI falling edges must occur strictly between the lower boundary (50ms) and upper boundary (1.6s) to prevent RST assertion. This dual-boundary enforcement distinguishes it from standard watchdogs and is explicitly documented in the LTC2917/LTC2918 datasheet for B-versions. The LTC2917CMS-B1#TRPBF uses only falling edges on WDI for window validation.
What is the minimum supply voltage required for reliable operation of the LTC2917CMS-B1#TRPBF?
The LTC2917CMS-B1#TRPBF guarantees RST assertion down to VCC ≥ 0.8V and exits undervoltage lockout above 1.5V. For accurate threshold monitoring, VCC must be ≥1.5V; below that, the internal reference is unstable and reset behavior is undefined. The 0.8V minimum ensures fail-safe reset during deep brownouts - a key requirement validated in automotive cold-crank testing. This specification applies directly to the LTC2917CMS-B1#TRPBF across its –40°C to 85°C operating range.
Can the LTC2917CMS-B1#TRPBF monitor a 12V supply directly?
Yes, the LTC2917CMS-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 nominal) must be placed between the 12V source and VCC to limit input current to ≤5mA, as specified in the Absolute Maximum Ratings. This eliminates external regulators - a capability confirmed for the LTC2917CMS-B1#TRPBF in Linear's Typical Application TA03 and Applications Information section.
How does the LTC2917CMS-B1#TRPBF differ from the LTC2918 series?
The LTC2917CMS-B1#TRPBF lacks the MR (manual reset) pin present in LTC2918 variants - it is a pure supervisor with no push-button interface. It retains full TOL-based tolerance selection (–5%/–10%/–15%), whereas LTC2918 fixes tolerance at –5%. Both share identical pinout, threshold tables, watchdog architecture, and MSOP-10 packaging. The LTC2917CMS-B1#TRPBF is selected when manual reset is unnecessary and multi-tolerance flexibility is required.
LTC2917CMS-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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP
LTC2917CMS-B1#TRPBF FAQ
1.How can I place an order for LTC2917CMS-B1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2917CMS-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 LTC2917CMS-B1#TRPBF reliable?
The price and inventory of LTC2917CMS-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 LTC2917CMS-B1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2917CMS-B1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2917CMS-B1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2917CMS-B1#TRPBF?
LTC2917CMS-B1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2917CMS-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 LTC2917CMS-B1#TRPBF?
For technical support, including LTC2917CMS-B1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2917CMS-B1#TRPBF requirements.
6.How does Aetrix verify that LTC2917CMS-B1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2917CMS-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 LTC2917CMS-B1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2917CMS-B1#TRPBF?
All LTC2917CMS-B1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2917CMS-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 LTC2917CMS-B1#TRPBF part is unused and in its original packaging.
Return procedure for LTC2917CMS-B1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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