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Analog Devices Inc. LTC2917IDDB-A1#TRPBF
- Part No.:
- LTC2917IDDB-A1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC2917IDDB-A1#TRPBF.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,814
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Product details
Overview
LTC2917IDDB-A1#TRPBF from Analog Devices (formerly Linear Technology) is a precision voltage supervisor IC with 27 selectable reset thresholds, adjustable watchdog timer, and manual reset disable-designed for automotive-grade monitoring of 1.5V–5.5V supplies. It features ±1.5% threshold accuracy over –40°C to +85°C, 30μA quiescent current, and windowed watchdog capability in B-versions. Used in engine control units to monitor 3.3V microcontroller supply rails with glitch-immune reset assertion.
For engineers reviewing the LTC2917IDDB-A1#TRPBF datasheet, LTC2917IDDB-A1#TRPBF pinout, LTC2917IDDB-A1#TRPBF application, or LTC2917IDDB-A1#TRPBF equivalent, key selection criteria include internal 9-threshold selection via SEL1/SEL2, fixed –5% tolerance (A1 variant), 200ms internal reset timeout, 1.6s internal watchdog upper bound, and DFN-10 (3mm × 2mm) package compatibility with high-density automotive PCB layouts.
Technical Context
The LTC2917IDDB-A1#TRPBF implements a dual-stage comparator architecture with internal reference division and three-state input decoding for threshold selection. Its VM input monitors external supply voltage against one of nine nominal thresholds (12V to ADJ=0.5V), each configurable with ±5% tolerance only-no ±10%/±15% options, as those require TOL pin (absent in A1 variant). The device uses internal RC timing for RST and WDI timeouts without external components in default mode.
It integrates a 6.2V shunt regulator on VCC for operation up to 12V supplies when paired with a series current-limiting resistor, and guarantees RST assertion down to VCC = 0.8V. Glitch immunity is achieved via combined 100μs–150μs input filtering (tUV) and programmable reset timeout, preventing false triggers during load transients near threshold crossings.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | 1.5V to 5.5V direct; up to 12V with external series resistor and internal 6.2V shunt regulation |
| Threshold Accuracy | ±1.5% over full temperature range (–40°C to +85°C), ensuring reliable trip point margining against supply tolerances |
| Reset Timeout (Internal) | 200ms typical when RT tied to VCC-enables stable power-up sequencing for MCUs before firmware initialization |
| Watchdog Upper Bound (Internal) | 1.6s typical when WT tied to VCC-provides sufficient time for longest software loop execution before system reset |
| Quiescent Current | 30μA typical-minimizes standby power draw in always-on automotive modules |
| Operating Temperature | –40°C to +85°C (I-grade)-qualified for under-hood and infotainment subsystem deployment |
| VM Input Impedance | 0.5MΩ to 8MΩ depending on SEL configuration-reduces loading on monitored rail and enables high-resistance divider use |
Pinout & Package
Package: 10-lead (3mm × 2mm) plastic DFN with exposed pad (pin 11, optional GND connection). Pin pitch: 0.5mm. Thermal resistance θJA = 43°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND | Ground reference | Primary return path for all internal circuitry and RST pull-down; must be low-impedance connection |
| SEL1 / SEL2 | Threshold select inputs | Three-state logic (VCC/GND/open) selecting one of nine nominal VM thresholds-no TOL pin in A1 variant |
| VM | Monitor input | High-impedance comparator input; connects directly to supply rail or resistive divider for ADJ mode |
| RST | Open-drain reset output | Asserts low during undervoltage or watchdog timeout; requires external pull-up to logic rail (e.g., 10kΩ to 3.3V) |
| RT | Reset timeout control | Tie to VCC for 200ms internal timeout; leave open for ~400μs; add capacitor for adjustable delay (9ms/nF) |
| WT | Watchdog timeout control | Tie to VCC for 1.6s internal upper bound; open for ~3.2ms; connect to GND to disable watchdog |
| WDI | Watchdog input | Falling-edge sensitive; must toggle within watchdog window (LTC2917-B only) or upper bound (LTC2917-A) |
| 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-but A1 variant fixes tolerance at –5%, yielding 9 usable thresholds |
| Windowed Watchdog (B-version only) | This part is A1 variant: standard watchdog only-no lower-bound enforcement; falling-edge detection still active |
| No External Resistors Required | Full threshold selection and timing set via SEL/WT/RT pins-eliminates BOM cost and layout area for discrete dividers/timers |
| Guaranteed RST Below 0.8V VCC | Ensures valid reset assertion during brown-out conditions where MCU may not operate reliably |
| Glitch Immunity (tUV ≤ 150μs) | Rejects short-duration supply noise spikes without requiring additional RC filtering on VM |
Applications
| Engine Control Unit (ECU) Power Monitoring | ADAS Camera Module Supply Supervision |
|---|---|
Use Scenario: Monitors 3.3V domain powering CAN controller and sensor interface ASIC in automotive ECU. IC Role / Device Role / Timing Role: Voltage supervisor asserting RST if 3.3V rail drops below 3.036V (–9% nominal) for >200ms after recovery. Use Value: Prevents firmware lockup by enforcing hard reset before corrupted register states propagate-critical for ISO 26262 ASIL-B compliance. | Use Scenario: Ensures clean boot of image signal processor in 77GHz radar camera module operating at 125°C ambient. IC Role / Device Role / Timing Role: Supervises 1.8V core supply using SEL1=GND/SEL2=GND configuration; asserts RST on undervoltage with 200ms hold time. Use Value: Eliminates need for external timing capacitor-reducing component count while maintaining guaranteed ±1.5% threshold accuracy at high temperature. |
| Infotainment Head Unit Reset Management | Telematics Control Unit (TCU) Watchdog Enforcement |
Use Scenario: Coordinates power sequencing between application processor, GPU, and PMIC in Android-based head unit. IC Role / Device Role / Timing Role: Uses RT tied to VCC to generate fixed 200ms reset pulse, synchronizing release of multiple downstream reset lines. Use Value: Replaces discrete RC network with deterministic, temperature-stable timing-reducing board-level calibration effort. | Use Scenario: Validates continuous operation of LTE modem firmware in vehicle telematics gateway. IC Role / Device Role / Timing Role: WDI driven by modem's GPIO; watchdog upper bound set to 1.6s via WT=VCC to match maximum idle loop duration. Use Value: Detects firmware hangs without adding CPU overhead-no software timer required, reducing risk of missed watchdog feeds. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G33DBVR | Fixed 3.3V threshold; no selectable voltages or watchdog; 1.8V–6.5V supply range | Suitable only for single-rail systems; lacks multi-threshold flexibility and safety-critical watchdog | Select when cost sensitivity outweighs configurability needs and system has only one monitored rail |
| MAX6326UT29D3+T | Fixed 2.93V threshold; no watchdog; 1.0V–5.5V supply; 3μA quiescent current | Ultra-low-power alternative but no timing adjustability or multi-voltage support | Prefer for battery-backed RTC supervision where 30μA is unacceptable and only one threshold is needed |
Compared with TPS3808G33DBVR and MAX6326UT29D3+T, the LTC2917IDDB-A1#TRPBF provides unique value in multi-rail automotive designs requiring field-programmable thresholds, integrated watchdog, and guaranteed operation across extended temperature-without sacrificing precision or adding external components.
Availability
LTC2917IDDB-A1#TRPBF is available at Aetrix Electronics and suitable for automotive control systems, ADAS camera modules, and telematics gateways requiring stable component supply with I-grade temperature qualification and long-term lifecycle assurance.
Supply support for LTC2917IDDB-A1#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) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, acquired Linear Technology in 2017 to expand precision power management portfolio.
The LTC2917 family was designed specifically for automotive and industrial systems needing robust, configurable power supervision with minimal external components and guaranteed parametric performance across harsh thermal environments.
FAQ
What is the exact threshold voltage for LTC2917IDDB-A1#TRPBF when SEL1=GND and SEL2=GND?
When SEL1=GND and SEL2=GND, the LTC2917IDDB-A1#TRPBF configures for the ADJ (adjustable) mode with nominal 0.5V threshold. With fixed –5% tolerance (A1 variant), the actual trip point is 0.475V ±1.5% (0.468V–0.482V) over –40°C to +85°C. This mode requires an external resistive divider on VM to scale higher supply voltages to 0.475V.
Does LTC2917IDDB-A1#TRPBF support windowed watchdog functionality?
No. The LTC2917IDDB-A1#TRPBF is an A1 version, which implements standard watchdog timing only-monitoring for WDI edge presence within the upper boundary (1.6s internal). Windowed watchdog (requiring both upper and lower boundaries) is exclusive to B1 versions like LTC2917IDDB-B1#TRPBF.
Can LTC2917IDDB-A1#TRPBF monitor a 12V supply directly?
Yes-with external design. The LTC2917IDDB-A1#TRPBF cannot accept 12V directly on VCC (absolute max 5.7V), but its internal 6.2V shunt regulator allows operation from 12V when a series current-limiting resistor is used. For example, a 11kΩ resistor limits VCC current to <5mA while dropping ~6.3V, enabling safe 12V supply monitoring via VM pin.
What is the minimum VCC voltage required for LTC2917IDDB-A1#TRPBF to assert a valid RST?
The LTC2917IDDB-A1#TRPBF guarantees RST assertion for VCC ≥ 0.8V, even before exiting undervoltage lockout (1.5V). This ensures early reset signaling during brown-out conditions where the host MCU may already be nonfunctional-critical for fail-safe automotive behavior.
How does the absence of the TOL pin affect threshold selection on LTC2917IDDB-A1#TRPBF?
The LTC2917IDDB-A1#TRPBF omits the TOL pin and fixes tolerance at –5% across all nine thresholds. Unlike LTC2917 variants with TOL, it cannot configure –10% or –15% trip points. This simplifies routing and reduces pin count but limits margining flexibility-users must select nominal voltage (e.g., 3.3V) knowing the effective threshold will always be 3.135V ±1.5%.
LTC2917IDDB-A1#TRPBF 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x2)
LTC2917IDDB-A1#TRPBF FAQ
1.How can I place an order for LTC2917IDDB-A1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2917IDDB-A1#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 LTC2917IDDB-A1#TRPBF reliable?
The price and inventory of LTC2917IDDB-A1#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2917IDDB-A1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2917IDDB-A1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2917IDDB-A1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2917IDDB-A1#TRPBF?
LTC2917IDDB-A1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2917IDDB-A1#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 LTC2917IDDB-A1#TRPBF?
For technical support, including LTC2917IDDB-A1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2917IDDB-A1#TRPBF requirements.
6.How does Aetrix verify that LTC2917IDDB-A1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2917IDDB-A1#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 LTC2917IDDB-A1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2917IDDB-A1#TRPBF?
All LTC2917IDDB-A1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2917IDDB-A1#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 LTC2917IDDB-A1#TRPBF part is unused and in its original packaging.
Return procedure for LTC2917IDDB-A1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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