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Analog Devices Inc. LTC2936IUFD#PBF
- Part No.:
- LTC2936IUFD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LTC2936IUFD#PBF.pdf
- Description:
- IC SUPERVISOR 6 CHANNEL 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:210
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Product details
Overview
LTC2936IUFD#PBF from Analog Devices (formerly Linear Technology) is a programmable hex voltage supervisor IC with integrated EEPROM, I²C interface, and six comparator outputs. It monitors up to six independent supply rails (0.2V–5.8V range), offers ±1% threshold accuracy, 7.5µs comparator response, and operates from 3.4V to 13.9V VPWR. It is used in high-availability server power sequencing and fault logging.
For engineers reviewing the LTC2936IUFD#PBF datasheet, LTC2936IUFD#PBF pinout, LTC2936IUFD#PBF application, or LTC2936IUFD#PBF equivalent, key selection criteria include I²C-configurable UV/OV thresholds per channel, autonomous EEPROM-backed fault history, GPIO delay-on-release programming (1ms–1.64s), and −40°C to +85°C industrial temperature rating.
Technical Context
The LTC2936IUFD#PBF implements six independent analog comparators with user-selectable precision/low/medium input ranges, each supporting dual (UV/OV) trip points programmed via 8-bit DACs. Threshold resolution is 4mV (precision), 10mV (low), or 20mV (medium) range.
Its digital subsystem includes an I²C/SMBus slave interface (up to 400kHz), 256 programmable thresholds per channel, status/history registers, and EEPROM-backed fault snapshot storage (10-year retention, 10k write cycles). Two GPI inputs and three GPIO pins support configurable logic mapping, ALERT output, and programmable release delays.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supervised Channels | 6 independent voltage inputs (V1–V6), each with programmable UV/OV thresholds and polarity |
| Threshold Accuracy | ±1% max over full temperature range (−40°C to +85°C) in medium range (>3V), enabling tight system margin control |
| Comparator Response | 7.5µs typical for 20 LSB overdrive - ensures rapid fault detection in high-speed power systems |
| I²C Interface | Standard-mode (10–400kHz) SMBus-compatible interface with 9 selectable slave addresses via ASEL0/ASEL1 |
| Supply Range | VPWR = 3.4V to 13.9V; supports direct connection to 5V, 12V, or intermediate rails without external regulators |
| EEPROM Endurance | 10,000 write cycles with 10-year data retention - enables reliable field-updatable configuration and fault logging |
| GPIO Delay-on-Release | Programmable from 1ms to 1.64s (8-step binary encoding) - prevents chatter during marginal supply recovery |
Pinout & Package
Package: 24-lead (4mm × 5mm) plastic QFN with exposed pad (Pin 25 = GND). RoHS-compliant, lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V1–V6 | Analog voltage input | Monitor up to six independent supply rails; each supports 3 programmable ranges (0.2–1.2V, 0.5–3V, 1–5.8V) |
| CMP1–CMP6 | Open-drain comparator output | Assert low on UV/OV fault; internally pulled up to VDD33 (15µA); compatible with 3.3V/5V logic |
| GPI1, GPI2 | Configurable general-purpose input | Support MR, UVDIS, MARG, WP, or AUXC functions; 15µA internal pull-up; 0.6–1.4V logic threshold |
| GPIO1–GPIO3 | Configurable input/output | Programmable as input, open-drain output, or weak pull-up output; supports ALERT latching per SMBus spec |
| SCL, SDA | I²C serial interface | 400kHz max clock; requires external pull-ups; supports global alert address (0x73) and alert response (0x0C) |
| ASEL0, ASEL1 | I²C address select | Set one of nine 7-bit slave addresses (0x50–0x5A) by tying to GND, VDD33, or leaving floating |
| VPWR | Main power input | 3.4V–13.9V supply for internal regulator and analog circuitry; bypass with ≥100nF to GND |
| VDD33 | Internal 3.3V regulator output | Provides regulated 3.3V (±1%) for digital logic; requires 100nF decoupling; can be disabled for external 3.3V use |
Key Features
| Feature | Design Value |
|---|---|
| EEPROM-backed autonomous operation | Stores configuration and first-fault snapshot; restores at power-up - eliminates host firmware dependency for basic supervision |
| Per-channel dual-threshold programming | Independent UV and OV trip points per V1–V6 input, enabling asymmetric fault windows (e.g., tighter UV, wider OV) |
| Programmable GPIO delay-on-release | Eight discrete delay options (1ms–1.64s) per GPIO output - suppresses false reassertion during supply recovery |
| Flexible GPI/GPIO mapping | Inputs (GPI1/GPI2) can be routed to any GPIO configured as output - enables custom reset propagation or fault aggregation |
| ALERT output compliant with SMBus spec | Latched low on any fault; cleared only via alert response address acknowledge, HISTORY_WORD read, or CLEAR_HISTORY command |
Applications
| Server Power Sequencing | Telecom Line Card Monitoring |
|---|---|
|
Use Scenario: Coordinating startup/shutdown of multi-rail FPGA, CPU, and memory supplies in 1U rack servers. IC Role / Device Role / Timing Role: Centralized voltage supervisor providing synchronized reset assertion, fault logging, and I²C-accessible status for BMC integration. Use Value: Eliminates discrete supervisors and timing RC networks; reduces BOM count by 6× while enabling post-fault diagnostics via EEPROM-stored history. |
Use Scenario: Real-time monitoring of +3.3V, +5V, +12V, and -48V rails on carrier-grade line cards with hot-swap capability. IC Role / Device Role / Timing Role: Fault detector with programmable UV/OV thresholds and GPIO-controlled power-enable signaling to DC/DC controllers. Use Value: Enables dynamic margin testing (via MARG input) and automatic rail disable on undervoltage - preventing latch-up in sensitive analog front-ends. |
| Industrial PLC Power Management | Storage Controller Health Monitoring |
|
Use Scenario: Supervising isolated 24V, 12V, 5V, and 3.3V rails in programmable logic controllers operating in harsh environments. IC Role / Device Role / Timing Role: Industrial-grade supervisor (−40°C to +85°C) with EEPROM-persistent fault records for predictive maintenance reporting. Use Value: Provides traceable fault timestamps and root-cause identification (e.g., V3 UV before V2 OV) without host intervention. |
Use Scenario: Monitoring NVMe SSD controller rails (+1.8V, +3.3V, +12V) and auxiliary voltages in enterprise storage arrays. IC Role / Device Role / Timing Role: Supervisor with ALERT output tied to baseboard management controller (BMC) for immediate fault escalation. Use Value: Guarantees <7.5µs response to rail collapse - meets PCIe specification for fast link down assertion and graceful firmware shutdown. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6816ESE+ | Quad supervisor (not hex); no EEPROM; fixed thresholds; no I²C interface; 16-pin SOIC package | Limited to 4 rails; requires external microcontroller for configuration; no autonomous fault logging | Choose for cost-sensitive, low-channel-count designs where programmability and EEPROM are unnecessary |
| TPS389033QDSGRQ1 | Triple supervisor (not hex); automotive AEC-Q100 qualified; fixed 3.3V threshold; no I²C; 8-pin WSON | Designed for automotive infotainment; lacks multi-rail flexibility and configurability; no EEPROM or GPIOs | Choose only for automotive 3.3V-only monitoring where AEC-Q100 compliance is mandatory |
Compared with MAX6816ESE+ and TPS389033QDSGRQ1, the LTC2936IUFD#PBF uniquely delivers six independently programmable rails, EEPROM-backed fault history, and full I²C configurability in a single 24-pin QFN - making it optimal for complex, field-upgradable embedded systems requiring diagnostic traceability.
Availability
LTC2936IUFD#PBF is available at Aetrix Electronics and suitable for high-availability computer systems, telecom equipment, and data storage systems requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for LTC2936IUFD#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 and maintains its high-performance analog and power management portfolio. Linear's legacy design ethos emphasizes precision, reliability, and robustness in power integrity ICs.
The LTC2936IUFD#PBF belongs to Linear's voltage supervisor family, engineered specifically for mission-critical power monitoring in servers, storage, and telecom infrastructure where autonomous fault detection and EEPROM-backed diagnostics are essential.
FAQ
What is the operating temperature range of the LTC2936IUFD#PBF?
The LTC2936IUFD#PBF is rated for −40°C to +85°C ambient operation, matching the "I" grade designation in its part number. This industrial temperature range ensures reliable performance in telecom line cards, server motherboards, and industrial PLCs where thermal stress is significant. The device's ±1% threshold accuracy is guaranteed across this full range in the medium monitoring range (3V–5.8V).
Does the LTC2936IUFD#PBF require an external microcontroller to function?
No - the LTC2936IUFD#PBF supports autonomous operation after initial I²C configuration. Its internal EEPROM stores all settings and captures the first fault event, allowing it to supervise up to six rails and assert comparator outputs without host interaction. However, an I²C master is required for initial setup, real-time status polling, and history clearing.
How many distinct voltage thresholds can be programmed per channel on the LTC2936IUFD#PBF?
Each of the six channels (V1–V6) supports two independent, programmable thresholds: one for undervoltage (UV) and one for overvoltage (OV). Thresholds are set via 8-bit DACs with resolution dependent on selected range: 4mV (precision), 10mV (low), or 20mV (medium). This enables asymmetric fault windows - for example, a tighter UV limit and wider OV guardband on the same rail.
Can the GPIO pins on the LTC2936IUFD#PBF drive LEDs or small relays directly?
The GPIO pins on the LTC2936IUFD#PBF are open-drain or weak pull-up outputs with 3mA sink capability (VOL = 0.4V @ 3mA) and no active high-drive capability. They can directly drive LEDs with appropriate current-limiting resistors tied to VPWR (up to 13.9V), but cannot source sufficient current for relays. For relay control, an external NPN transistor or MOSFET driver is required.
What is the purpose of the ASEL0 and ASEL1 pins on the LTC2936IUFD#PBF?
The ASEL0 and ASEL1 pins on the LTC2936IUFD#PBF configure the device's 7-bit I²C slave address, selecting one of nine possible addresses (0x50–0x5A) by connecting them to GND, VDD33, or leaving them floating. This enables multiple LTC2936IUFD#PBF devices on the same I²C bus without address conflict - critical in multi-supply systems like blade servers or modular telecom chassis.
LTC2936IUFD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 6
- Voltage - Threshold:
- Adjustable/Selectable
- Output:
- Open Drain or Open Collector
- Reset:
- -
- Reset Timeout:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QFN (4x5)
LTC2936IUFD#PBF FAQ
1.How can I place an order for LTC2936IUFD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2936IUFD#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 LTC2936IUFD#PBF reliable?
The price and inventory of LTC2936IUFD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2936IUFD#PBF is usually 5 days.
3.What payment methods are accepted for LTC2936IUFD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2936IUFD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2936IUFD#PBF?
LTC2936IUFD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2936IUFD#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 LTC2936IUFD#PBF?
For technical support, including LTC2936IUFD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2936IUFD#PBF requirements.
6.How does Aetrix verify that LTC2936IUFD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2936IUFD#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 LTC2936IUFD#PBF meets industry standards.
7.What is the process for return or replacement of LTC2936IUFD#PBF?
All LTC2936IUFD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2936IUFD#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 LTC2936IUFD#PBF part is unused and in its original packaging.
Return procedure for LTC2936IUFD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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