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Analog Devices Inc. LTC2917HDDB-B1#TRMPBF
- Part No.:
- LTC2917HDDB-B1#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC2917HDDB-B1#TRMPBF.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,932
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Product details
Overview
LTC2917HDDB-B1#TRMPBF from Analog Devices (formerly Linear Technology) is a high-temperature voltage supervisor IC with 27 selectable reset thresholds, windowed watchdog timer, and manual reset disable-designed for automotive and industrial systems requiring guaranteed operation to 125°C. It operates from 1.5V to 5.5V supply, consumes 30μA quiescent current, supports 1.8V/2.5V/3.3V/5V/12V supply monitoring, and delivers ±1.5% threshold accuracy over temperature.
For engineers reviewing the LTC2917HDDB-B1#TRMPBF datasheet, LTC2917HDDB-B1#TRMPBF pinout, LTC2917HDDB-B1#TRMPBF application, or LTC2917HDDB-B1#TRMPBF equivalent, this page provides verified functional context, validated pin roles, confirmed B1-series windowed watchdog behavior, exact DFN-10 (3mm × 2mm) package mapping, and two manufacturer-confirmed alternative parts for automotive-grade voltage supervision.
Technical Context
The LTC2917HDDB-B1#TRMPBF implements a dual-stage comparator architecture with glitch-filtered VM input and internal reference division. Its B1 variant enforces strict windowed watchdog timing: falling edges on WDI must occur between tWDL = 50ms (min) and tWDU = 1.6s (max), or RST asserts. Threshold selection uses three-state SEL1/SEL2/TOL inputs-no external resistors required-and guarantees ±1.5% accuracy across –40°C to +125°C.
Reset timeout is configurable via RT pin: open (400μs), tied to VCC (200ms), or capacitor-coupled (9ms/nF). The device includes a 6.2V shunt regulator on VCC for direct 12V operation with series current-limiting resistor, and guarantees RST assertion down to VCC ≥ 0.8V during power-up sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | 1.5V to 5.5V; supports direct low-voltage logic rails and high-voltage operation via internal 6.2V shunt regulator with external series resistor |
| Threshold Accuracy | ±1.5% over full –40°C to +125°C range; eliminates need for margining in automotive thermal environments |
| Quiescent Current | 30μA typical; enables always-on supervision in battery-backed or low-power systems without significant drain |
| Watchdog Type | Windowed (B1 version); requires falling edge on WDI within 50ms–1.6s window-prevents false resets from stuck or slow software loops |
| Reset Timeout | Internally fixed at 200ms when RT = VCC; adjustable from 400μs to >100ms using external capacitor on RT pin |
| Operating Temp | –40°C to +125°C (H-grade); qualified for under-hood automotive control units and industrial motor drives |
| VCC Undervoltage Lockout | Guaranteed ≤1.5V; ensures reliable RST assertion during brown-out conditions before internal circuitry becomes unstable |
Pinout & Package
Package: 10-lead (3mm × 2mm) plastic DFN with exposed pad (pin 11, optional GND connection). Pinout matches LTC2917 family DFN configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground Reference | Primary return path for all internal circuits; exposed pad may be connected here for improved thermal performance |
| TOL (Pin 2) | Tolerance Select Input | Three-state control for –5% (VCC), –10% (open), or –15% (GND) threshold tolerance; only active on LTC2917 variants |
| SEL2 (Pin 3) | Threshold Selection Bit | One of two three-state inputs selecting nominal VM threshold (e.g., 1.8V, 3.3V, 5V, ADJ); open/GND/VCC encoding per Table 1 |
| SEL1 (Pin 4) | Threshold Selection Bit | Second three-state input completing 9-threshold selection matrix; used with SEL2 and TOL to define full 27 combinations |
| VM (Pin 5) | Monitor Input | High-impedance comparator input (0.5–15V range); monitors external supply; ADJ mode accepts 0.5V reference for custom thresholds |
| RST (Pin 6) | Open-Drain Reset Output | Asserts low when VM < threshold + timeout; requires external pull-up; supports wired-OR with other supervisors |
| RT (Pin 7) | Reset Timeout Control | Configures internal reset timer: open = 400μs, VCC = 200ms, capacitor-to-GND = 9ms/nF (e.g., 2.2nF → 20ms) |
| WT (Pin 8) | Watchdog Timeout Control | Configures windowed watchdog upper bound: open = 3.2ms, VCC = 1.6s, capacitor-to-GND = 72ms/nF |
| WDI (Pin 9) | Watchdog Input | Falling-edge-triggered input; B1 version requires edges strictly within tWDL–tWDU window to avoid reset assertion |
| VCC (Pin 10) | Power Supply Input | Accepts 1.5–5.5V directly; above 5.7V, internal 6.2V shunt regulator activates-requires series resistor to limit current to ≤5mA |
Key Features
| Feature | Design Value |
|---|---|
| 27 Selectable Thresholds | Combines 9 nominal voltages (12V to ADJ) × 3 tolerances (–5%/–10%/–15%)-enables single-part support across diverse rail architectures without external resistors |
| Windowed Watchdog (B1) | Prevents system lockup from both stalled firmware (no WDI toggle) and excessively fast toggling (violating lower boundary)-critical for ASIL-B/C applications |
| Glitch-Filtered VM Input | Rejects transients <100μs duration even near threshold; eliminates false resets from load-switch noise or EMI without compromising DC accuracy |
| 125°C Guaranteed Operation | H-grade qualification ensures parametric stability and reliability in engine-control modules, transmission ECUs, and industrial inverters |
| Low-Power Supervision | 30μA ICC enables continuous monitoring in always-on domains (e.g., CAN wake-up circuits, security boot monitors) without battery depletion |
Applications
| Automotive Engine Control Unit (ECU) | Industrial Motor Drive Controller |
|---|---|
Use Scenario: Monitoring 5V microcontroller supply and 12V sensor bus in under-hood ECU exposed to –40°C to +125°C ambient. IC Role / Device Role / Timing Role: Voltage supervisor with windowed watchdog ensuring MCU reset if firmware hangs or sensor data stream stalls. Use Value: ±1.5% threshold accuracy prevents nuisance resets during thermal cycling; B1 watchdog rejects both frozen and runaway code-meeting ISO 26262 diagnostic coverage requirements. | Use Scenario: Supervising 3.3V FPGA configuration rail and 24V gate-driver auxiliary supply in variable-frequency drive cabinet. IC Role / Device Role / Timing Role: Dual-rail monitor with independent reset timeout and windowed watchdog on critical logic supply. Use Value: 200ms fixed reset timeout ensures clean FPGA reconfiguration after brown-out; 1.6s watchdog upper bound aligns with safety PLC cycle times. |
| Telecom Base Station Power Shelf | Rail-Specific Server Management Controller |
Use Scenario: Validating 1.8V DSP core supply and 12V backplane interface rail in outdoor macrocell base station operating at –30°C to +70°C. IC Role / Device Role / Timing Role: High-reliability supervisor with glitch immunity against RF-induced supply noise on sensitive analog rails. Use Value: 100μs glitch rejection prevents false resets from nearby PA switching; 6.2V shunt regulator allows direct 12V rail connection without external LDO. | Use Scenario: Monitoring 1V CPU core rail and 3.3V BMC communication rail in enterprise server motherboard with multi-phase VRMs. IC Role / Device Role / Timing Role: Precision rail supervisor enabling BIOS-level fault logging and graceful shutdown on undervoltage detection. Use Value: ADJ mode configured for 0.5V reference enables accurate 1V rail monitoring at ±1.5% error; RST open-drain supports shared reset bus with PMIC. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326US29D3+T | Fixed 2.93V threshold; no selectable thresholds or watchdog; SOT23-5 package; 3.0V to 5.5V supply | Single-rail monitoring only; no windowed watchdog or multi-supply flexibility | Select when only basic 2.93V reset is needed and board space is constrained-no configuration pins or timing adjustment required |
| TPS3808G18DBVR | Fixed 1.8V threshold; adjustable watchdog (non-windowed); 1.4V to 6.5V supply; 6-pin SOT23 | Lacks tolerance selection, ADJ mode, and H-grade temp support; watchdog lacks lower-bound enforcement | Choose for cost-sensitive consumer applications needing 1.8V supervision and simple watchdog-but not for automotive or high-reliability use |
Compared with MAX6326US29D3+T and TPS3808G18DBVR, the LTC2917HDDB-B1#TRMPBF offers unique configurability (27 thresholds, windowed watchdog, ADJ mode) and guaranteed 125°C operation-making it irreplaceable for multi-rail, safety-critical, or thermally demanding designs where flexibility and reliability are non-negotiable.
Availability
LTC2917HDDB-B1#TRMPBF is available at Aetrix Electronics and suitable for automotive engine control units, industrial motor drives, telecom power shelves, and server management controllers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC2917HDDB-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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.
The LTC2917 product line was designed specifically for robust, configurable power-supply monitoring in harsh environments-including automotive, industrial, and aerospace systems-where precision, reliability, and wide temperature operation are mandatory.
FAQ
What is the maximum supply voltage the LTC2917HDDB-B1#TRMPBF can tolerate on its VCC pin?
The LTC2917HDDB-B1#TRMPBF features an internal 6.2V shunt regulator on the VCC pin. When supplied above 5.7V, a series current-limiting resistor must be used to restrict VCC pin current to ≤5mA. Absolute maximum VCC is 5.7V for direct connection; higher voltages require external resistor sizing per datasheet Equation 1. This enables safe operation from 12V automotive batteries without external LDOs.
Does the LTC2917HDDB-B1#TRMPBF support manual reset functionality?
No, the LTC2917HDDB-B1#TRMPBF does not include a manual reset (MR) input. That feature is exclusive to the LTC2918 family (e.g., LTC2918HDDB-B1#TRMPBF). The LTC2917HDDB-B1#TRMPBF is the threshold-selectable, TOL-enabled variant without MR-making it ideal for systems where reset is fully automated via VM monitoring and watchdog events.
How does the windowed watchdog in the LTC2917HDDB-B1#TRMPBF differ from standard watchdog timers?
The LTC2917HDDB-B1#TRMPBF's B1-version windowed watchdog requires falling edges on WDI to occur strictly between tWDL = 50ms and tWDU = 1.6s. Edges outside this window-either too fast (<50ms) or too slow (>1.6s)-trigger RST assertion. This prevents false resets from noisy signals or stuck firmware while rejecting pathological oscillation, unlike standard watchdogs that only enforce an upper timeout bound.
Can the LTC2917HDDB-B1#TRMPBF monitor a 1V supply with ±10% tolerance?
Yes. Using SEL1 = GND and SEL2 = Open configures the nominal threshold to 1V. Setting TOL = Open selects –10% tolerance, resulting in a trip point of 0.900V (typical) with ±1.5% accuracy-guaranteeing 0.885V to 0.915V over temperature. This meets the requirement for reliable 1V ±10% rail supervision without external components.
What is the minimum VCC voltage required for the LTC2917HDDB-B1#TRMPBF to assert a valid RST output?
The LTC2917HDDB-B1#TRMPBF guarantees RST assertion for VCC ≥ 0.8V, even before exiting undervoltage lockout (which occurs at ≤1.5V). This ensures early reset signaling during power-up sequencing, allowing downstream logic to remain held until VCC stabilizes above the 1.5V UVLO threshold-critical for predictable boot behavior in multi-rail systems.
LTC2917HDDB-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)
LTC2917HDDB-B1#TRMPBF FAQ
1.How can I place an order for LTC2917HDDB-B1#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2917HDDB-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 LTC2917HDDB-B1#TRMPBF reliable?
The price and inventory of LTC2917HDDB-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 LTC2917HDDB-B1#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC2917HDDB-B1#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2917HDDB-B1#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2917HDDB-B1#TRMPBF?
LTC2917HDDB-B1#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2917HDDB-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 LTC2917HDDB-B1#TRMPBF?
For technical support, including LTC2917HDDB-B1#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2917HDDB-B1#TRMPBF requirements.
6.How does Aetrix verify that LTC2917HDDB-B1#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC2917HDDB-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 LTC2917HDDB-B1#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC2917HDDB-B1#TRMPBF?
All LTC2917HDDB-B1#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2917HDDB-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 LTC2917HDDB-B1#TRMPBF part is unused and in its original packaging.
Return procedure for LTC2917HDDB-B1#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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