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Analog Devices Inc. LTC2966CUD#PBF
- Part No.:
- LTC2966CUD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
LTC2966CUD#PBF.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:119
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Product details
Overview
LTC2966CUD#PBF from Analog Devices is a micropower dual-channel high-voltage voltage monitor IC designed for precise undervoltage/overvoltage supervision in systems with rails up to 100V. It features two independent monitoring channels (A/B), ±1.4% max threshold accuracy over temperature, 7µA quiescent current, and 100V-rated open-drain outputs with internal 500kΩ pull-up. It is used in telecom power supplies to detect 48V and 24V rail faults before system reset or shutdown.
For engineers reviewing the LTC2966CUD#PBF datasheet, LTC2966CUD#PBF pinout, LTC2966CUD#PBF application, or LTC2966CUD#PBF equivalent, key selection criteria include input voltage range (3.5V–100V), adjustable threshold scaling (5x/10x/20x/40x), built-in hysteresis configuration, polarity-selectable outputs, and QFN-16 package compatibility with high-density PCB layouts.
Technical Context
The LTC2966CUD#PBF integrates two independent high-voltage comparator channels, each with programmable internal resistive dividers (5x–40x) and dual reference inputs (INHA/INLA, INHB/INLB) for rising/falling threshold definition. Thresholds are scaled by range-select pins (RS1A/RS2A, RS1B/RS2B) and referenced to a buffered 2.402V internal reference (±0.5% initial accuracy).
Each output (OUTA/OUTB) is a 100V-tolerant active-pull-down stage with gated 500kΩ internal pull-up to an internally regulated 3.5V–5V rail; polarity is configurable via PSA/PSB pins. The device enters UVLO below 3V on either VINA or VINB, forcing both outputs low regardless of polarity setting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | 3.5V to 100V on VINA or VINB - supports direct monitoring of telecom, industrial, and automotive battery rails without external level-shifting. |
| Quiescent Current | 7µA typical - enables always-on supervision in battery-powered equipment with multi-year runtime. |
| Threshold Accuracy | ±1.4% max over –40°C to 125°C - ensures reliable trip points across thermal stress without calibration. |
| Output Rating | 100V absolute max on OUTA/OUTB - allows direct connection to high-side rails up to 98V with external pull-up. |
| Internal Reference | 2.402V ±0.5% (initial), 140µVRMS noise - provides stable bias for external resistor networks setting INH/INL thresholds. |
| Hysteresis Options | Built-in (14–30mV, range-scaled) or external - eliminates oscillation near threshold without adding external components. |
| Propagation Delay | 40–80µs (10x range, 10% overdrive) - enables fast fault response while avoiding false triggers from transient noise. |
Pinout & Package
Package: 16-lead (3mm × 3mm) plastic QFN (UD package), exposed pad (Pin 17) optional GND connection. Thermal resistance θJA = 68°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (REF) | Buffered reference output | 2.402V source for biasing INH/INL dividers; max 100µA load; requires ≤1nF bypass. |
| 2 (INHA), 3 (INLA) | Channel A comparator reference inputs | Set rising (INHA) and falling (INLA) thresholds; scaled by RS1A/RS2A; VCM = 0.35–2.45V. |
| 4 (RS1A), 5 (RS2A) | Channel A range select inputs | Binary-coded selection of 5x/10x/20x/40x internal divider ratio for VINA monitoring. |
| 6 (GND) | Device ground | Primary return path; exposed pad may be connected here for improved thermal performance. |
| 7 (INHB), 8 (INLB) | Channel B comparator reference inputs | Set rising (INHB) and falling (INLB) thresholds for VINB; identical function to INHA/INLA. |
| 9 (RS1B), 10 (RS2B) | Channel B range select inputs | Binary-coded selection of 5x/10x/20x/40x internal divider ratio for VINB monitoring. |
| 11 (OUTA) | Channel A status output | 100V-tolerant open-drain output with internal 500kΩ pull-up; polarity controlled by PSA. |
| 12 (VINA) | Channel A high-voltage input | Monitored rail input; internal 70MΩ divider connects to comparator; priority supply for internal regulation. |
| 13 (VINB) | Channel B high-voltage input | Monitored rail input; internal 70MΩ divider; secondary supply; UVLO triggered if both VINA/VINB < 3V. |
| 14 (OUTB) | Channel B status output | 100V-tolerant open-drain output with internal 500kΩ pull-up; polarity controlled by PSB. |
| 15 (PSA), 16 (PSB) | Channel A/B polarity select | Connect to REF (>1.4V) for inverting output logic; connect to GND for noninverting logic. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent monitoring channels | Enables simultaneous supervision of primary and backup rails (e.g., 48V + 24V) or over/undervoltage detection on one rail. |
| Programmable 5x/10x/20x/40x scaling | Allows precise threshold setting from 1.75V to 98V using low-value, low-tolerance external resistors at safe low voltages. |
| Built-in hysteresis (14–30mV) | Eliminates chatter during slow-rising/falling transitions without external RC networks; selectable per channel via INH/INL grounding. |
| 100V-rated outputs with internal pull-up | Reduces BOM count by eliminating external pull-up resistors in many applications; supports wire-OR of OUTA/OUTB. |
| UVLO protection with forced low outputs | Guarantees fail-safe behavior: both outputs go low if either input drops below 3V, preventing undefined logic states. |
Applications
| Telecom Power Supervision | Industrial DC Power Monitoring |
|---|---|
|
Use Scenario: Monitoring 48V and 24V backplane supplies in LTE base station power modules. IC Role / Device Role / Timing Role: Dual-channel voltage supervisor detecting undervoltage events on redundant DC feeds to trigger graceful shutdown or switchover. Use Value: ±1.4% threshold accuracy ensures compliance with GR-1089-CORE immunity requirements; 7µA IQ avoids loading standby rails. |
Use Scenario: Supervising 36V and 72V battery strings in programmable logic controller (PLC) power stages. IC Role / Device Role / Timing Role: High-voltage rail monitor providing fault signals to FPGA-based safety logic for battery disconnect control. Use Value: 100V output rating enables direct interface with isolated gate drivers; 40x range supports 72V detection with 1.8V INL reference. |
| Automotive 12V/48V Dual-Bus Systems | Hot-Swap Controller Interface |
|
Use Scenario: Validating pre-charge and main power sequencing in 48V mild-hybrid vehicle ECUs. IC Role / Device Role / Timing Role: Dual-threshold monitor verifying 12V auxiliary and 48V propulsion bus stability before enabling load switches. Use Value: Independent polarity selection (PSA/PSB) allows one channel to assert low on undervoltage and another high on overvoltage-enabling single-wire fault signaling. |
Use Scenario: Detecting inrush-induced undershoot during hot-plug insertion of server line cards into midplane backplanes. IC Role / Device Role / Timing Role: Fast-propagation (40µs) voltage supervisor triggering hot-swap controller disable within 100µs of rail collapse. Use Value: 140V absolute max input rating withstands transient ringing; built-in hysteresis prevents false trips during damped oscillations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel high-voltage voltage monitor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6805US29D3+T | Single-channel, fixed 2.93V threshold, no range scaling, 5.5V max supply | Only suitable for low-voltage (≤5.5V) rail monitoring; lacks dual-channel flexibility and high-voltage capability | Select only for cost-sensitive, single-rail 3.3V/5V systems where scalability and high-voltage tolerance are unnecessary. |
| TPS3897ADRYR | Dual-channel, 1.2V–5.5V supply, 1.2V–3.3V adjustable thresholds, no >10V monitoring support | Designed for low-power MCU supervision; cannot monitor 24V/48V rails directly without external resistive dividers and level shifters | Choose when supervising sub-5V logic rails with tight accuracy (±0.5%) but avoid for high-voltage applications requiring integrated scaling. |
Compared with MAX6805US29D3+T and TPS3897ADRYR, the LTC2966CUD#PBF uniquely combines dual-channel operation, 100V input tolerance, programmable scaling, and micropower consumption-making it the only option capable of direct, accurate, and self-contained supervision of telecom and industrial DC rails without external active circuitry.
Availability
LTC2966CUD#PBF is available at Aetrix Electronics and suitable for telecom power systems, industrial PLCs, and automotive 48V ECU designs requiring stable component supply, long-lifecycle availability, and guaranteed lead-free compliance.
Supply support for LTC2966CUD#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 power management semiconductors, serving precision instrumentation, communications, and industrial markets.
The LTC2966 belongs to Linear's high-voltage supervisor product line, engineered specifically for robust, low-power monitoring of unregulated or widely varying DC rails in harsh environments such as telecom infrastructure and factory automation.
FAQ
What is the operating temperature range for the LTC2966CUD#PBF?
The LTC2966CUD#PBF is rated for 0°C to 70°C ambient operation. This commercial-grade variant uses the 16-lead 3mm × 3mm QFN package (UD) and is optimized for applications like telecom line cards and industrial controllers where extended temperature coverage is not required. Its specifications-including ±1.4% threshold accuracy and 7µA quiescent current-are guaranteed across this full range.
Can the LTC2966CUD#PBF monitor two different voltage rails simultaneously?
Yes, the LTC2966CUD#PBF monitors two independent voltage rails via VINA and VINB inputs. Each channel has dedicated range select (RS1A/RS2A, RS1B/RS2B), polarity (PSA/PSB), and reference (INHA/INLA, INHB/INLB) pins, allowing fully separate configuration-for example, 48V undervoltage detection on Channel A and 24V overvoltage detection on Channel B-without shared components or interaction.
How does the built-in hysteresis work on the LTC2966CUD#PBF?
The LTC2966CUD#PBF implements built-in hysteresis by grounding either INHA (for rising-edge hysteresis) or INLA (for falling-edge hysteresis); the magnitude (14–30mV) scales with the selected range (5x–40x). When INLA is grounded, the falling threshold becomes RANGE × VHYS below the rising threshold set by INHA-eliminating external hysteresis resistors while maintaining precise, temperature-stable trip margins.
Is an external pull-up resistor required for the OUTA and OUTB pins of the LTC2966CUD#PBF?
No external pull-up is required: the LTC2966CUD#PBF includes an internal 500kΩ pull-up to an internally regulated 3.5V–5V rail. However, if the output must be pulled to a higher voltage (e.g., 48V or 98V), an external resistor can be added-the internal pull-up automatically disables when the external voltage exceeds VOH (~2.5V). This design reduces BOM count while preserving flexibility.
What is the purpose of the REF pin on the LTC2966CUD#PBF?
The REF pin delivers a buffered 2.402V reference (±0.5% initial accuracy, 140µVRMS noise) used to bias external resistor networks that set INHA/INLA and INHB/INLB voltages. It also serves as a logic-high source for range and polarity select pins (RS1A/RS2A, PSA/PSB), eliminating need for additional voltage sources and ensuring consistent threshold scaling across temperature and supply variations.
LTC2966CUD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Monitor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- Adjustable/Selectable
- Output:
- Open Drain or Open Collector
- Reset:
- -
- Reset Timeout:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (3x3)
LTC2966CUD#PBF FAQ
1.How can I place an order for LTC2966CUD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2966CUD#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 LTC2966CUD#PBF reliable?
The price and inventory of LTC2966CUD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2966CUD#PBF is usually 5 days.
3.What payment methods are accepted for LTC2966CUD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2966CUD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2966CUD#PBF?
LTC2966CUD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2966CUD#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 LTC2966CUD#PBF?
For technical support, including LTC2966CUD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2966CUD#PBF requirements.
6.How does Aetrix verify that LTC2966CUD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2966CUD#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 LTC2966CUD#PBF meets industry standards.
7.What is the process for return or replacement of LTC2966CUD#PBF?
All LTC2966CUD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2966CUD#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 LTC2966CUD#PBF part is unused and in its original packaging.
Return procedure for LTC2966CUD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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