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Analog Devices Inc. LTC2962CUD#PBF
- Part No.:
- LTC2962CUD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
LTC2962CUD#PBF.pdf
- Description:
- IC SUPERVISOR 4 CHANNEL 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:115
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Product details
Overview
LTC2962CUD#PBF from Analog Devices is a ±0.5% accurate quad configurable power supply supervisor IC for monitoring up to four independent voltage rails-including 5V, 3.3V, 2.5V, 1.8V, 1.5V, 1.2V, 1.0V, and ±ADJ thresholds-using external 1% resistors on PG inputs. It features guaranteed RST output operation down to VCC = 1V, adjustable reset timeout via external capacitor (12 ms/nF), and push-pull or open-drain RST output selectable via DVCC pin. It is used in high-reliability server power sequencing and telecom board-level supervision.
For engineers reviewing the LTC2962CUD#PBF datasheet, LTC2962CUD#PBF pinout, LTC2962CUD#PBF application, or LTC2962CUD#PBF equivalent, key selection criteria include ±0.5% threshold accuracy over temperature, 16 programmable thresholds per channel, C-grade (0°C to 70°C) operation, 16-lead 3mm × 3mm QFN package, and support for undervoltage, overvoltage, and negative-voltage monitoring.
Technical Context
The LTC2962CUD#PBF implements a 4-channel analog comparator architecture with internal 1.195V buffered reference and 4-bit ADC-based threshold selection per channel. Each Vn input is compared against one of 16 factory-trimmed thresholds (±0.5% over –40°C to 125°C), selected by voltage division at PG1–PG4 referenced to REF. The RST output is asserted immediately on any threshold violation and held for a user-configurable timeout period.
It supports dual RST output modes: open-drain (DVCC = GND) with 6µA internal pull-up to VCC, or active push-pull (DVCC ≥ 1.6V) swinging to DVCC. Reset disable (RDIS) and manual reset (MR) inputs provide margining and system-initiated reset control without requiring external logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.25V to 5.5V - supports wide-input industrial and telecom supplies without level-shifting. |
| Threshold Accuracy | ±0.5% over temperature - enables tighter system voltage margins and reduces need for oversized power components. |
| RST Low Guarantee | Operates down to VCC = 1V - ensures reliable reset assertion during brownout and low-VCC startup conditions. |
| Reset Timeout | Configurable 12ms/nF (CRT) or fixed 200ms - allows precise timing control for processor boot sequences. |
| Input Leakage (V1–V4) | ±15nA in ±ADJ mode; 0.8–1.6MΩ in fixed-threshold modes - minimizes loading on sensitive power rails. |
| Reference Voltage | 1.195V ±12mV (±1%) - stable, buffered REF output drives external resistor networks with minimal error contribution. |
| Propagation Delay | 20–40µs (tUV) - fast response to supply faults prevents system lockup before critical logic fails. |
Pinout & Package
Package: 16-lead 3mm × 3mm plastic QFN (UD package) with exposed pad (pin 17), rated for 0°C to 70°C (C-grade). PCB ground connection to exposed pad is optional but recommended for thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RDIS | Reset Disable Input | Pulling low forces RST high - enables safe voltage margining without triggering system reset. |
| MR | Manual Reset Input | Active-low input with internal 10µA pull-up - accepts pushbutton or logic signal to force immediate RST assertion. |
| DVCC | Digital Logic Supply | Selects RST output type: GND = open-drain; ≥1.6V = push-pull to DVCC - decouples logic swing from VCC rail. |
| VCC | Main Power Supply | 2.25–5.5V supply powering all analog circuitry and weakly pulling up RST/OUT pins - requires 0.1µF bypass. |
| REF | Buffered Reference Output | 1.195V ±12mV source/sink ≤1mA - drives external PG resistor dividers with <0.01% error contribution. |
| PG1–PG4 | Threshold Programming Inputs | Voltage-ratio inputs selecting one of 16 thresholds per channel - accept 0–VREF range; no capacitance allowed. |
| V1–V4 | Monitor Input Channels | High-impedance inputs accepting 0–6V - support +ADJ (≥0.5V), –ADJ (OV/–V), or fixed thresholds (5V to 1V). |
| RST | Reset Output | Open-drain (DVCC = GND) or push-pull (DVCC ≥1.6V); guaranteed low down to VCC = 1V - primary system reset signal. |
| GND | Device Ground | Analog/digital common reference - must be connected; exposed pad may be tied here for thermal relief. |
| RT | Reset Timeout Capacitor | Connect CRT to GND for 12ms/nF timing; tie to VCC for fixed 200ms - sets duration RST stays low after fault clearance. |
| PG4 | Channel 4 Threshold Select | Same function as PG1–PG3 - enables independent configuration of fourth monitored rail. |
Key Features
| Feature | Design Value |
|---|---|
| ±0.5% threshold accuracy over temperature | Reduces required system voltage margin by 1% vs ±1% supervisors - enables smaller bulk capacitors and lower nominal rail voltages. |
| 16 programmable thresholds per channel | Supports identical or mixed rail monitoring (e.g., 3.3V, 1.8V, 1.2V, 1.0V) using only 1% resistors - eliminates need for multiple discrete supervisors. |
| Adjustable reset timeout (12ms/nF) | Allows precise match to processor boot time - avoids premature release or unnecessary hold time that delays system initialization. |
| RST operation down to VCC = 1V | Ensures deterministic reset behavior during deep brownout - prevents undefined MCU state when main supply collapses. |
| Separate DVCC pin for RST logic swing | Enables RST to interface directly with 1.8V, 2.5V, or 3.3V logic domains without external level shifters - simplifies board design. |
Applications
| Server Power Sequencing | Telecom Line Card Supervision |
|---|---|
Use Scenario: Monitoring 12V, 3.3V, 1.8V, and 1.0V rails on a dual-CPU server motherboard during cold start and hot-swap events. IC Role / Device Role / Timing Role: Quad supervisor asserting RST until all rails stabilize above thresholds, then holding reset for 180ms to meet CPU tRST requirements. Use Value: ±0.5% accuracy prevents false resets caused by rail tolerance stacking, enabling tighter spec compliance and higher uptime. | Use Scenario: Supervising redundant 48V DC-DC outputs, 3.3V management rail, 1.2V FPGA core, and –12V analog bias on a carrier-grade line card. IC Role / Device Role / Timing Role: Simultaneous UV/OV detection across positive and negative rails; RDIS used for remote voltage margining via backplane command. Use Value: –ADJ mode enables reliable –12V undervoltage detection without extra op-amps; REF output drives precision divider networks. |
| Industrial PLC I/O Module | Automotive ADAS Domain Controller |
Use Scenario: Validating 24V field bus, 5V logic, 3.3V microcontroller, and 1.2V DDR memory rails in an IP67-rated PLC module operating from –25°C to 70°C. IC Role / Device Role / Timing Role: C-grade LTC2962CUD#PBF provides guaranteed operation across full industrial temp range; MR pin accepts front-panel reset button. Use Value: Guaranteed 1V VCC operation ensures reset remains active during 24V-to-5V converter dropout - prevents firmware corruption. | Use Scenario: Monitoring 12V battery feed, 5V camera sensor rail, 1.8V SerDes, and 1.0V SoC core in a radar/Ethernet domain controller with ASIL-B requirements. IC Role / Device Role / Timing Role: Configured with –4% thresholds for each rail; RST output feeds safety monitor ASIC with diagnostic feedback path. Use Value: Factory-trimmed ±0.5% accuracy satisfies ISO 26262 diagnostic coverage targets for voltage monitoring without calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6804–MAX6809 series (e.g., MAX6804US29D3+T) | Fixed single-threshold per channel; no ±ADJ mode; ±1.5% accuracy; no REF output; 8-pin SO/μMAX packages. | Limited to standard rail voltages only; no negative or overvoltage monitoring; no resistor-programmable flexibility. | Choose for cost-sensitive, single-rail systems where programmability and accuracy are secondary to footprint. |
| TPS3307-18 (TI) | Triple supervisor (not quad); ±2% accuracy; fixed 1.8V/3.3V/5V thresholds; no PG programming; 8-pin SOIC. | Cannot monitor four rails simultaneously; lacks adjustable timeout and RDIS functionality; no –ADJ capability. | Choose only if exactly three rails require supervision and highest accuracy is not required. |
Compared with MAX6804 and TPS3307-18, the LTC2962CUD#PBF delivers superior accuracy (±0.5% vs ±1.5–2%), full quad-channel configurability, ±ADJ mode for OV/–V detection, and integrated REF output - making it uniquely suited for high-integrity multi-rail systems where margin, flexibility, and reliability are critical.
Availability
LTC2962CUD#PBF is available at Aetrix Electronics and suitable for server power sequencing, telecom line card supervision, and industrial PLC I/O modules requiring stable component supply, long-term lifecycle support, and guaranteed C-grade temperature performance.
Supply support for LTC2962CUD#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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC2962 series belongs to Analog Devices' precision power supervision product line, designed specifically for high-reliability systems demanding ±0.5% threshold accuracy, flexible multi-rail monitoring, and robust brownout immunity across extended temperature ranges.
FAQ
What is the operating temperature range for the LTC2962CUD#PBF?
The LTC2962CUD#PBF is specified for the C-grade temperature range of 0°C to 70°C. This is explicitly defined in the Order Information table and Absolute Maximum Ratings section of the datasheet. It is distinct from the I-grade (–40°C to 85°C) and H-grade (–40°C to 125°C) variants, and the part marking "CUD" confirms its C-grade qualification. Operation outside this range is not guaranteed.
Can the LTC2962CUD#PBF monitor negative voltages?
Yes, the LTC2962CUD#PBF can monitor negative voltages using its –ADJ mode. When configured in –ADJ, the Vn input is compared to a 0.5V internal reference, enabling undervoltage detection on negative rails (e.g., –12V) by applying the negative supply through an external resistive divider. The absolute maximum rating for V1–V4 is –0.3V to 6V, confirming safe operation with negative inputs when properly biased.
How is the reset timeout period set on the LTC2962CUD#PBF?
The reset timeout on the LTC2962CUD#PBF is set via the RT pin: connecting an external capacitor CRT to GND yields a timeout of 12ms per nanofarad (e.g., 15nF → 180ms), while tying RT directly to VCC activates a fixed 200ms internal timeout. This is confirmed in the Electrical Characteristics table (tRST parameter) and Applications Information section, with no dependency on DVCC or other pins.
Does the LTC2962CUD#PBF have a watchdog timer function?
No, the LTC2962CUD#PBF does not include a watchdog timer. Watchdog functionality (WDI, WDO, WDS, WT pins) is exclusive to the LTC2963 variant, as clearly stated in the Features, Pin Configuration, and Block Diagram sections. The LTC2962CUD#PBF shares the same 16-lead QFN package and core supervision features but omits all watchdog-related pins and circuitry.
What is the purpose of the REF pin on the LTC2962CUD#PBF?
The REF pin on the LTC2962CUD#PBF provides a buffered 1.195V ±12mV reference output capable of sourcing/sinking up to ±1mA. It serves two critical functions: (1) as the voltage reference for external resistor dividers connected to PG1–PG4 to select thresholds, and (2) as a level-shift reference in –ADJ mode for negative or overvoltage monitoring. Its low drift and buffered drive ensure minimal error in threshold programming.
LTC2962CUD#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:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 4
- Voltage - Threshold:
- Adjustable/Selectable
- Output:
- Open-Drain or Push-Pull
- Reset:
- Active Low
- Reset Timeout:
- 160ms Minimum
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (3x3)
LTC2962CUD#PBF FAQ
1.How can I place an order for LTC2962CUD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2962CUD#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 LTC2962CUD#PBF reliable?
The price and inventory of LTC2962CUD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2962CUD#PBF is usually 5 days.
3.What payment methods are accepted for LTC2962CUD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2962CUD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2962CUD#PBF?
LTC2962CUD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2962CUD#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 LTC2962CUD#PBF?
For technical support, including LTC2962CUD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2962CUD#PBF requirements.
6.How does Aetrix verify that LTC2962CUD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2962CUD#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 LTC2962CUD#PBF meets industry standards.
7.What is the process for return or replacement of LTC2962CUD#PBF?
All LTC2962CUD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2962CUD#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 LTC2962CUD#PBF part is unused and in its original packaging.
Return procedure for LTC2962CUD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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