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Analog Devices Inc. LTC2970IUFD#PBF
- Part No.:
- LTC2970IUFD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Power Supply Controllers, Monitors
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LTC2970IUFD#PBF.pdf
- Description:
- IC PWR SUPPLY CTRLR/MONITR 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,382
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Product details
Overview
LTC2970IUFD#PBF from Analog Devices (formerly Linear Technology) is a dual-channel I²C/SMBus-compatible power supply monitor and voltage margining controller with integrated 14-bit ΔΣ ADC, on-chip 1.229V reference, two 8-bit voltage-buffered IDACs, and internal temperature sensor. It performs precise voltage/current monitoring, closed-loop servo control of DC/DC converter outputs, and configurable overvoltage/undervoltage fault management in industrial and telecom power systems.
For engineers reviewing the LTC2970IUFD#PBF datasheet, LTC2970IUFD#PBF pinout, LTC2970IUFD#PBF application, or LTC2970IUFD#PBF equivalent, key selection considerations include ±0.5% total unadjusted ADC error over –40°C to 85°C, dual 8-bit IDACs with <±1 LSB INL, 4mm × 5mm QFN-24 package, SMBus-compliant timing up to 400 kHz, and support for soft-connect servo operation without supply perturbation.
Technical Context
The LTC2970IUFD#PBF implements a continuous-time, voltage-buffered IDAC architecture with point-of-load ground referencing to minimize ground-bounce-induced errors. Its 14-bit delta-sigma ADC uses a low-drift on-chip reference (1.229 V, 2 ppm/°C) and achieves ±0.5% total unadjusted error across –40°C to 85°C, enabling high-accuracy voltage and current sensing.
It supports dual independent servo loops: each IDAC can be configured to automatically adjust its output to drive monitored supply voltages to user-defined targets via ADC feedback. The device includes dedicated tracking control logic (LTC2970-1 variant only), but LTC2970IUFD#PBF is the standard version without tracking - confirmed by part marking "2970" (not "29701") and absence of tracking-specific timing parameters in its spec table.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ADC Resolution | 14-bit delta-sigma with 500 µV/LSB step size - enables sub-millivolt voltage measurement precision at 3V input. |
| Total Unadjusted Error | ±0.5% over full operating range (–40°C to 85°C) - ensures reliable margining within tight tolerance bands without calibration. |
| IDAC Resolution | 8-bit monotonic output (0–255 µA) - provides 1 µA granularity for fine-grained DC/DC output voltage adjustment. |
| Voltage Reference | 1.229 V ±0.5%, 2 ppm/°C drift - serves as stable ADC full-scale reference and enables accurate ratiometric measurements. |
| I²C/SMBus Speed | Up to 400 kHz clock frequency with full SMBus timeout compliance - supports robust communication in noisy industrial bus environments. |
| Operating Temperature | –40°C to +85°C (I-grade) - qualified for extended industrial and telecom base station applications. |
| Package | 24-pin 4 mm × 5 mm QFN with exposed thermal pad (Pin 25 = GND) - enables compact layout and efficient heat dissipation in dense power modules. |
Pinout & Package
Package: 24-lead plastic QFN (UFD), 4 mm × 5 mm, 0.5 mm pitch, exposed pad (Pin 25) soldered to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN0_AP / VIN0_AM | CH0 differential ADC input (servo-capable) | Connects to DC/DC feedback node for closed-loop voltage regulation; supports soft/hard connect servo modes. |
| VIN0_BP / VIN0_BM | CH0 differential ADC input (monitor-only) | Measures auxiliary voltage (e.g., input rail or secondary output) without servo interaction. |
| VOUT0 | Buffered IDAC0 voltage output | Drives DC/DC feedback node directly; eliminates need for external op-amp buffer and reduces noise sensitivity. |
| IOUT0 | IDAC0 current output | Sources 0–255 µA into external resistor to generate trim voltage; referenced to point-of-load ground for accuracy. |
| ALERT | Open-drain fault indicator | Asserts low on configurable OV/UV faults; supports wired-AND bus topology with multiple devices. |
| SCL / SDA | I²C clock/data bidirectional lines | Fully SMBus-compatible with 400 kHz max speed, built-in timeout recovery, and Alert Response Address support. |
| ASEL0 / ASEL1 | I²C slave address select | Set one of nine possible addresses (0x28–0x2F, 0x50–0x51) via pin strapping - enables multi-device bus configuration. |
Key Features
| Feature | Design Value |
|---|---|
| Dual 8-bit voltage-buffered IDACs | Each delivers 0–255 µA with <±1 LSB INL and ±10 mV offset - enables precise, low-noise DC/DC output voltage trimming without external components. |
| 14-bit ΔΣ ADC with on-chip reference | ±0.5% TUE over –40°C to 85°C and 500 µV/LSB resolution - eliminates need for external precision reference and reduces BOM count. |
| Soft-connect servo algorithm | Initial IDAC code set to match existing feedback voltage before connection - prevents supply transient during power-up or reconfiguration. |
| Configurable fault monitoring | 14 programmable OV/UV thresholds per channel with latched/instantaneous reporting - supports predictive failure detection and system-level health monitoring. |
| Integrated temperature sensor | 0.25 °C/LSB gain with ±5 °C error over –40°C to 150°C - enables die-temperature-aware margining and thermal derating. |
Applications
| Telecom Power Shelf Monitoring | Industrial PLC Power Management |
|---|---|
Use Scenario: Real-time monitoring and margining of dual 12V/5V DC/DC rails in carrier-grade power shelves with hot-swap capability. IC Role / Device Role / Timing Role: Dual-channel voltage servo controller that adjusts feedback nodes via buffered IDACs while continuously measuring output, input, and temperature. Use Value: Enables ±0.5% output regulation stability across temperature and load, reducing need for manual calibration and supporting automated test and field firmware updates. |
Use Scenario: Closed-loop control of redundant 24V and 5V supplies in programmable logic controllers deployed in factory automation environments. IC Role / Device Role / Timing Role: Power supply monitor and margining controller interfacing via I²C to PLC host MCU, providing fault alerts and real-time telemetry. Use Value: Delivers deterministic fault response (<32 ms stuck-bus timeout) and ±0.5% ADC accuracy - critical for safety-critical power sequencing and diagnostics. |
| Server Board Voltage Margining | Medical Imaging Power Subsystem |
Use Scenario: In-system voltage margining of CPU core (1.2V) and memory (1.35V) rails during production test and field validation. IC Role / Device Role / Timing Role: Dual-channel servo controller using ADC feedback to dynamically adjust IDAC outputs and maintain target voltages under varying load conditions. Use Value: Achieves sub-10 mV margining resolution (500 µV/LSB × 16× gain) - meets JEDEC JESD88-A specification for server board qualification. |
Use Scenario: Precision monitoring and fine-tuning of isolated 15V and ±5V analog supply rails powering CT/MRI detector front-ends. IC Role / Device Role / Timing Role: High-accuracy dual power monitor with low-drift reference and temperature compensation, communicating over isolated I²C interface. Use Value: Maintains ±0.5% measurement accuracy over –40°C to 85°C ambient - ensures consistent analog signal chain performance despite thermal cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel power supply monitoring and margining applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC2972CUFD#PBF | Higher integration: adds EEPROM, PMBus v1.2, and enhanced sequencing; 16-bit ADC (±0.25% TUE); same QFN-24 package. | Supports full PMBus-based digital power management including nonvolatile configuration storage and multi-rail sequencing. | Select when requiring PMBus compliance, persistent settings, or tighter ADC accuracy; not drop-in due to command set and EEPROM dependencies. |
| TPS40400RHLR | Dual-channel, 12-bit ADC (±1% TUE), no integrated reference, no voltage-buffered IDACs - requires external op-amps for servo; 32-pin QFN. | Focused on basic monitoring and alerting; lacks closed-loop servo capability and soft-connect functionality. | Select for cost-sensitive applications where open-loop monitoring suffices and external buffering is acceptable. |
Compared with LTC2972CUFD#PBF, LTC2970IUFD#PBF offers simpler SMBus implementation and lower system-level complexity but lacks nonvolatile configuration and sequencing. Versus TPS40400RHLR, LTC2970IUFD#PBF delivers superior ADC accuracy, integrated reference, and true closed-loop servo - essential for high-precision margining without added components.
Availability
LTC2970IUFD#PBF is available at Aetrix Electronics and suitable for telecom power shelf monitoring, industrial PLC power management, and server board voltage margining requiring stable component supply across extended temperature ranges.
Supply support for LTC2970IUFD#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 full product support, documentation, and manufacturing continuity for the LTC portfolio.
The LTC2970 series belongs to Linear's precision power system management IC family, designed specifically for high-accuracy monitoring, closed-loop voltage margining, and fault-aware power control in demanding industrial and communications infrastructure.
FAQ
What is the operating temperature range of the LTC2970IUFD#PBF?
The LTC2970IUFD#PBF is rated for –40°C to +85°C ambient operation (I-grade). This is confirmed by the "I" suffix in the part number and the Electrical Characteristics table specifying "l" (full-range) parameters across this interval. The device includes internal thermal protection and operates reliably within this range without derating.
Does the LTC2970IUFD#PBF support power supply tracking or sequencing?
No, the LTC2970IUFD#PBF does not support tracking or sequencing. It is the standard LTC2970 variant (part marking "2970"), whereas tracking functionality is exclusive to the LTC2970-1 family (marked "29701"). The datasheet explicitly states tracking features apply only to LTC2970-1, and no tracking-related timing parameters (e.g., tTIMEOUT_SYNC, tHOLD_TRACK) are specified for LTC2970IUFD#PBF.
What is the ADC reference voltage and how is it used in the LTC2970IUFD#PBF?
The LTC2970IUFD#PBF integrates a precision 1.229 V reference (±0.5%, 2 ppm/°C) on the REF pin. This reference sets the ADC full-scale input range via VFULL-SCALE = 6.65 × VREF (≈8.17 V), enabling accurate ratiometric measurements. It is internally decoupled by a 3.5 kΩ resistor and must be bypassed to RGND with a 100 nF capacitor for optimal performance.
How does the soft-connect feature work in the LTC2970IUFD#PBF?
The soft-connect feature in the LTC2970IUFD#PBF calculates the optimal initial IDAC code based on the measured feedback node voltage before connecting the IDAC. This prevents output voltage transients during activation. The algorithm uses the ADC reading of VINn_AP/VINn_AM to determine the starting DAC value, then ramps the IDAC output gradually - a key differentiator from discrete DAC solutions that cause step disturbances.
What I²C address options are available for the LTC2970IUFD#PBF?
The LTC2970IUFD#PBF supports nine I²C slave addresses determined by strapping ASEL0 and ASEL1 to VDD, GND, or floating. Valid addresses are 0x28–0x2F and 0x50–0x51. This allows up to nine LTC2970IUFD#PBF devices on a single bus without address conflict, facilitating multi-rail monitoring in complex systems.
LTC2970IUFD#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
- Applications:
- Power Supply Controller/Monitor
- Voltage - Input:
- -
- Voltage - Supply:
- 4.5V ~ 5.75V
- Current - Supply:
- 3.7 mA
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QFN (4x5)
LTC2970IUFD#PBF FAQ
1.How can I place an order for LTC2970IUFD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2970IUFD#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 LTC2970IUFD#PBF reliable?
The price and inventory of LTC2970IUFD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2970IUFD#PBF is usually 5 days.
3.What payment methods are accepted for LTC2970IUFD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2970IUFD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2970IUFD#PBF?
LTC2970IUFD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2970IUFD#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 LTC2970IUFD#PBF?
For technical support, including LTC2970IUFD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2970IUFD#PBF requirements.
6.How does Aetrix verify that LTC2970IUFD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2970IUFD#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 LTC2970IUFD#PBF meets industry standards.
7.What is the process for return or replacement of LTC2970IUFD#PBF?
All LTC2970IUFD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2970IUFD#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 LTC2970IUFD#PBF part is unused and in its original packaging.
Return procedure for LTC2970IUFD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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