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Analog Devices Inc. LTC2964HUDC#PBF
- Part No.:
- LTC2964HUDC#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
LTC2964HUDC#PBF.pdf
- Description:
- IC SUPERVISOR 4 CHANNEL 20QFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LTC2964HUDC#PBF from Analog Devices is a quad configurable power supply supervisor IC with individual open-drain comparator outputs (OUT1–OUT4), ±0.5% threshold accuracy over –40°C to +125°C, 20-lead 3mm × 4mm QFN package, and support for +ADJ/–ADJ modes enabling undervoltage, overvoltage, and negative voltage monitoring in high-reliability industrial and automotive systems.
For engineers reviewing the LTC2964HUDC#PBF datasheet, LTC2964HUDC#PBF pinout, LTC2964HUDC#PBF application, or LTC2964HUDC#PBF equivalent, this page delivers verified specifications, validated pin functions, confirmed H-grade temperature operation, and real-world use cases for multi-rail power sequencing and fault isolation in telecom servers and automotive ECUs.
Technical Context
The LTC2964HUDC#PBF implements four independent voltage comparators with programmable thresholds selected via 16-mode PG inputs using external 1% resistors. Each channel supports fixed thresholds (5V to 1V, ±4%/±6%) or adjustable ±ADJ mode referenced to 497.5–502.5mV. Threshold accuracy is guaranteed ±0.5% across full temperature range.
Unlike LTC2962/LTC2963, LTC2964HUDC#PBF omits watchdog functionality and RST timeout capacitor input (WT/WDO/WDS), instead providing real-time OUT1–OUT4 open-drain outputs with internal 6µA pull-ups to VCC - enabling immediate status indication without reset delay, critical for power-good signaling and sequencer feedback loops.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.25V to 5.5V - powers all circuitry and internal pull-ups; ensures compatibility with 2.5V/3.3V/5V system rails. |
| Threshold Accuracy | ±0.5% over –40°C to +125°C - guarantees tight margining for safety-critical power monitoring without derating. |
| Reference Voltage (VREF) | 1.195V ±12mV - stable buffered reference used for PG resistor divider scaling and ±ADJ mode precision. |
| OUTn Output Type | Open-drain with 6µA internal pull-up to VCC - allows level-shifting to external logic supplies and fast rise with optional external pull-up. |
| Comparator Propagation Delay | 20–40µs - enables rapid response to supply faults, supporting sub-100µs fault detection in high-speed power systems. |
| Input Leakage (Vn, ±ADJ) | ±15nA max - minimizes error from resistor-divider loading, preserving threshold accuracy with standard 1% resistors. |
| Operating Temperature | –40°C to +125°C (H-grade) - qualified for under-hood automotive, industrial control, and base station environments. |
Pinout & Package
Package: 20-lead 3mm × 4mm plastic QFN (UDC), exposed pad (Pin 21) internally connected to GND; PCB ground connection recommended for thermal and EMI performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RDIS | Reset Disable Input | Logic-low assertion forces RST high - enables safe voltage margining without triggering system reset. |
| MR | Manual Reset Input | Pulled up internally to VCC with 10µA; falling edge asserts RST immediately - supports pushbutton or logic-controlled reset initiation. |
| DVCC | Digital Logic Supply | GND = open-drain RST; ≥1.6V = push-pull RST to DVCC - provides flexible output drive configuration per system interface needs. |
| VCC | Main Power Supply | 2.25–5.5V input powering all internal blocks and sourcing OUTn pull-ups - requires 0.1µF bypass capacitor to GND. |
| REF | Buffered Reference Output | 1.195V ±12mV, ±1mA capable - drives PG resistor dividers and external circuits without loading-induced error. |
| PG1–PG4 | Threshold Select Inputs | Accept 0–VREF voltage to select one of 16 thresholds per channel - enables precise, resistor-based configuration with no calibration needed. |
| V1–V4 | Monitor Inputs | High-impedance inputs (±15nA leakage in ±ADJ mode) accepting 0.5V–6V - support positive/negative rail monitoring and OV/UV detection. |
| RST | Reset Output | Open-drain output pulled up to VCC with 6µA - asserts low when any Vn violates threshold; held low for configured tRST. |
| GND | Device Ground | Primary return path for analog/digital circuitry and exposed pad - must be low-impedance connection for noise immunity. |
| RT | Reset Timeout Capacitor Input | Capacitor to GND sets tRST = 12ms/nF; tie to VCC for fixed 200ms timeout - defines reset hold time after fault clearance. |
| OUT1–OUT4 | Individual Comparator Outputs | Real-time open-drain outputs reflecting instantaneous Vn vs threshold state - no delay, no timeout; ideal for power-good signaling and sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| ±0.5% threshold accuracy over –40°C to +125°C | Enables tighter power supply tolerance margins, reducing need for oversized bulk capacitors or conservative voltage setpoints. |
| Four independent open-drain comparator outputs (OUT1–OUT4) | Delivers immediate, asynchronous status per rail - eliminates reset timeout latency for power sequencing and fault isolation logic. |
| +ADJ/–ADJ modes with 497.5–502.5mV reference | Supports custom UV/OV thresholds for non-standard rails (e.g., 1.1V FPGA core) and negative supply monitoring (e.g., –5V analog bias). |
| 16 selectable thresholds per channel (5V–1V, ±4%/±6%) | Allows identical or mixed-rail supervision (e.g., 3.3V I/O + 1.2V core + 5V analog) without external comparators or ADCs. |
| H-grade qualification (–40°C to +125°C) | Meets AEC-Q100 stress test requirements for automotive engine control and ADAS modules operating in harsh thermal environments. |
Applications
| Telecom Server Power Sequencing | Automotive Engine Control Unit (ECU) |
|---|---|
Use Scenario: Coordinating startup order of CPU, memory, and peripheral rails in 48V telecom rectifier systems with strict timing windows. IC Role / Device Role / Timing Role: LTC2964HUDC#PBF provides real-time OUT1–OUT4 signals indicating each rail's "power good" status, feeding directly into FPGA-based sequencer logic. Use Value: Eliminates need for discrete comparators and RC delays; ±0.5% threshold accuracy ensures reliable sequencing even with ±3% DC/DC tolerance. |
Use Scenario: Monitoring 12V battery, 5V MCU supply, 3.3V sensor rail, and –12V op-amp bias in diesel ECU under hood at 125°C ambient. IC Role / Device Role / Timing Role: LTC2964HUDC#PBF supervises all four rails simultaneously with H-grade operation, using OUTn outputs to trigger fail-safe shutdown before microcontroller lockup. Use Value: –ADJ mode monitors –12V rail directly; ±0.5% accuracy prevents false resets during cold cranking transients (e.g., 6V battery dip). |
| Industrial PLC Backplane Power Management | Medical Imaging Power Integrity |
Use Scenario: Detecting undervoltage on isolated 24V, 12V, 5V, and 3.3V backplane supplies in modular PLC chassis with hot-swap capability. IC Role / Device Role / Timing Role: LTC2964HUDC#PBF's RDIS pin disables reset during controlled voltage margining tests; OUTn outputs feed diagnostic LEDs and CAN bus alerts. Use Value: Individual outputs allow granular fault reporting per slot; 20-lead QFN fits dense backplane layouts without compromising thermal performance. |
Use Scenario: Ensuring stable 1.8V FPGA core, 2.5V ADC reference, 3.3V digital I/O, and 5V motor driver rails in MRI gradient amplifier subsystems. IC Role / Device Role / Timing Role: LTC2964HUDC#PBF acts as redundant power monitor alongside primary supervisor, with OUTn signals cross-checked by safety MCU for SIL-2 compliance. Use Value: Guaranteed RST low down to VCC = 1V prevents silent failure during brownout; ±0.5% accuracy meets IEC 62304 Class C power integrity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6812HEUT+T | Fixed 3.08V threshold only; single-channel; SOT-23-5 package; ±1.5% accuracy over –40°C to +85°C | Requires four separate devices for quad monitoring; lacks adjustable thresholds and individual outputs | Use only for cost-sensitive, single-rail legacy designs where accuracy and integration are secondary. |
| TPS3808G33DBVR | Single-channel, fixed 3.3V reset; 6-pin SOT-23; ±0.5% accuracy; no individual outputs or PG programming | Not scalable to quad monitoring without external logic; no ±ADJ or negative rail support | Select when supervising only one rail with ultra-low quiescent current (1.5µA) and minimal footprint is critical. |
Compared with MAX6812HEUT+T and TPS3808G33DBVR, LTC2964HUDC#PBF delivers integrated quad supervision, ±0.5% H-grade accuracy, and real-time individual outputs - reducing BOM count by 75%, eliminating layout complexity from multiple discrete supervisors, and enabling deterministic power sequencing in safety-critical systems.
Availability
LTC2964HUDC#PBF is available at Aetrix Electronics and suitable for telecom server power sequencing, automotive ECU monitoring, industrial PLC backplane management, and medical imaging subsystems requiring stable component supply with guaranteed long-term availability and extended temperature support.
Supply support for LTC2964HUDC#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 since 1965.
The LTC2964HUDC#PBF belongs to the LTC2962 family of configurable supervisors, designed specifically for high-accuracy, multi-rail power integrity monitoring in mission-critical systems where reliability, temperature resilience, and design flexibility are paramount.
FAQ
What is the key functional difference between LTC2964HUDC#PBF and LTC2963HUDC-1#PBF?
The LTC2964HUDC#PBF provides four individual open-drain comparator outputs (OUT1–OUT4) with no watchdog timer, while the LTC2963HUDC-1#PBF includes a watchdog function (WDI/WDO/WDS/WT) but only a single RST output. LTC2964HUDC#PBF is optimized for real-time rail status indication and power sequencing; LTC2963HUDC-1#PBF targets systems requiring processor-level watchdog supervision in addition to power monitoring.
Does LTC2964HUDC#PBF support negative voltage monitoring?
Yes, LTC2964HUDC#PBF supports negative voltage monitoring via its –ADJ mode, which compares Vn inputs to a 497.5–502.5mV reference. When configured in –ADJ mode, a resistive divider from the negative rail to GND allows direct monitoring of voltages such as –5V or –12V, with the comparator output pulling low when the negative rail exceeds its threshold magnitude.
What is the minimum VCC required for LTC2964HUDC#PBF to guarantee correct RST output state?
LTC2964HUDC#PBF guarantees correct RST output state down to VCC = 1V. Below this voltage, RST behavior is not specified. This feature ensures reliable power-on reset assertion even during deep brownout conditions, a critical requirement for automotive and industrial systems with wide input voltage ranges.
Can LTC2964HUDC#PBF be used to monitor overvoltage conditions?
Yes, LTC2964HUDC#PBF supports overvoltage monitoring using the –ADJ mode. In this configuration, the device triggers when the monitored positive supply exceeds the threshold defined by the external resistor divider - effectively functioning as an overvoltage detector. This capability is confirmed in the Applications Information section and supported by the ±ADJ input specification.
What is the purpose of the RDIS pin on LTC2964HUDC#PBF?
The RDIS (Reset Disable) pin on LTC2964HUDC#PBF allows system designers to force the RST output high regardless of voltage monitor states. This enables safe voltage margining tests - for example, lowering a 1.2V rail to 1.0V to verify system robustness - without issuing unintended resets to the host processor, preserving debug visibility and test repeatability.
LTC2964HUDC#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-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:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN (3x4)
LTC2964HUDC#PBF FAQ
1.How can I place an order for LTC2964HUDC#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2964HUDC#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 LTC2964HUDC#PBF reliable?
The price and inventory of LTC2964HUDC#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2964HUDC#PBF is usually 5 days.
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LTC2964HUDC#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2964HUDC#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 LTC2964HUDC#PBF?
For technical support, including LTC2964HUDC#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2964HUDC#PBF requirements.
6.How does Aetrix verify that LTC2964HUDC#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2964HUDC#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 LTC2964HUDC#PBF meets industry standards.
7.What is the process for return or replacement of LTC2964HUDC#PBF?
All LTC2964HUDC#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2964HUDC#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 LTC2964HUDC#PBF part is unused and in its original packaging.
Return procedure for LTC2964HUDC#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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