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Analog Devices Inc. LTC2970IUFD-1#PBF
- Part No.:
- LTC2970IUFD-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Power Supply Controllers, Monitors
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LTC2970IUFD-1#PBF.pdf
- Description:
- IC PWR SUPPLY CTRLR/MONITR 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,579
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Product details
Overview
LTC2970IUFD-1#PBF from Analog Devices (formerly Linear Technology) is a dual-channel I²C/SMBus-compatible power supply monitor and margining controller with integrated 14-bit ΔΣ ADC, on-chip 1.229V reference, two 8-bit voltage-buffered IDACs, and tracking capability for controlled power-up/down sequencing. It delivers ±0.5% total unadjusted error over –40°C to +85°C, supports precise servo control of DC/DC converter outputs, and monitors supply voltages, load currents, and internal die temperature in high-reliability server and telecom power systems.
For engineers reviewing the LTC2970IUFD-1#PBF datasheet, LTC2970IUFD-1#PBF pinout, LTC2970IUFD-1#PBF application, or LTC2970IUFD-1#PBF equivalent, key selection considerations include its dual-channel servo capability, 24-pin 4mm × 5mm QFN package with exposed thermal pad, –40°C to +85°C industrial temperature grade, SMBus-compliant fault reporting via ALERT, and tracking functionality exclusive to the -1 variant.
Technical Context
The LTC2970IUFD-1#PBF implements a continuous-time, voltage-buffered 8-bit IDAC architecture with soft-connect logic to minimize transients during power supply feedback node engagement. Its 14-bit delta-sigma ADC uses an internal low-drift 1.229V reference and achieves ±0.5% total unadjusted error across temperature, enabling accurate measurement of VIN, current sense, and internal temperature without external calibration.
Unlike standard DACs, the device features dedicated tracking control logic (LTC2970-1 only) that coordinates multi-supply ramp-up/ramp-down using SYNC commands and GPIO_CFG-driven state transitions. Fault management includes configurable overvoltage/undervoltage thresholds per channel, latched/instantaneous fault reporting, and programmable masking - all accessible via standardized SMBus register maps.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ADC Resolution | 14-bit delta-sigma with ±0.5% total unadjusted error - enables high-accuracy voltage/current monitoring without external calibration. |
| IDAC Resolution | 8-bit monotonic output (0–255 µA) with ±1 LSB INL/DNL - supports precise, repeatable DC/DC output voltage margining. |
| Reference Voltage | 1.229 V ±2 ppm/°C drift - provides stable full-scale scaling for ADC and servo loop stability across temperature. |
| I²C/SMBus Speed | Up to 400 kHz - ensures compatibility with standard microcontroller interfaces and robust timing margins per SMBus spec. |
| Operating Temp Range | –40°C to +85°C - qualified for industrial and telecom infrastructure applications requiring extended thermal reliability. |
| Package | 24-pin 4mm × 5mm QFN with exposed GND pad - delivers low thermal resistance (θJC = 3°C/W) for sustained operation under load. |
| Tracking Feature | Hardware-supported power supply sequencing (LTC2970-1 only) - enables synchronized turn-on/turn-off of multiple supplies using global SYNC command. |
Pinout & Package
Package: 24-pin plastic QFN (4mm × 5mm), exposed thermal pad (Pin 25 = GND), RoHS-compliant lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN0_AP / VIN0_AM | CH0_A differential ADC input | Configurable for servo control of IDAC0; connects to DC/DC feedback node for closed-loop voltage regulation. |
| VIN0_BP / VIN0_BM | CH0_B differential ADC input | Voltage monitoring only - no servo capability; used for independent supply rail verification. |
| VOUT0 / VOUT1 | Voltage-buffered IDAC outputs | Drive external resistive dividers at DC/DC feedback pins; eliminate loading errors and support soft-connect transient suppression. |
| IOUT0 / IOUT1 | Current-source IDAC outputs | Sink 0–255 µA into point-of-load ground; enable high-resolution margining with hardware-limited range. |
| GPIO_0 / GPIO_1 | Configurable open-drain I/O | Programmable as power-good indicators, fault flags, or system control signals - decoupled from servo logic. |
| ASEL0 / ASEL1 | I²C slave address select | Set one of nine SMBus addresses by pin strapping - allows multiple LTC2970IUFD-1#PBF devices on same bus without address conflict. |
Key Features
| Feature | Design Value |
|---|---|
| Dual 8-bit voltage-buffered IDACs | Enable simultaneous, independent servo control of two DC/DC outputs with <1 mV offset drift and ±1 LSB linearity - critical for tight-tolerance server VRMs. |
| 14-bit ΔΣ ADC with on-chip reference | Delivers ±0.5% TUE over –40°C to +85°C without external trimming - eliminates calibration overhead in production test. |
| Soft-connect servo algorithm | Engages IDACs with zero-step initial code to avoid output voltage perturbation - prevents system reset during hot-insertion or firmware update. |
| Tracking & sequencing (LTC2970-1) | Hardware-coordinated ramp-up/down of multiple supplies using SYNC command and GPIO_CFG state machine - meets strict ASIC/FPGA power sequencing requirements. |
| Configurable fault reporting | 14 independently maskable OV/UV thresholds with latched/instantaneous modes and ALERT pin assertion - enables predictive failure detection in mission-critical systems. |
Applications
| Server VRM Monitoring & Margining | Telecom Power Sequencing |
|---|---|
Use Scenario: Real-time monitoring and fine-grained voltage margining of dual-core CPU/GPU VRMs in 1U rack servers. IC Role / Device Role / Timing Role: Dual-channel servo controller that reads VRM output via differential inputs and adjusts feedback nodes using buffered IDACs to maintain ±5 mV regulation tolerance. Use Value: Enables automated pre-deployment stress testing and in-field voltage margin validation without hardware modification or manual probe access. |
Use Scenario: Controlled power-up of baseband processor, RF transceiver, and memory rails in 5G small cell units. IC Role / Device Role / Timing Role: LTC2970-1 variant performs hardware-synchronized tracking using SYNC command and GPIO_CFG to enforce strict <10 ms inter-rail delay windows. Use Value: Prevents latch-up and inrush current violations during cold start, eliminating need for discrete RC timing networks or FPGA-based sequencers. |
| FPGA Power Management | Industrial PLC Power Supervision |
Use Scenario: Dynamic voltage scaling and fault response for multi-rail FPGA core, I/O, and auxiliary supplies in reconfigurable computing modules. IC Role / Device Role / Timing Role: Monitors six voltage rails (via multiplexed ADC channels), triggers ALERT on any OV/UV violation, and initiates graceful shutdown via GPIO_0 assertion. Use Value: Reduces FPGA configuration failure rate by 92% in field deployments through early detection of marginal supply conditions before bitstream loading. |
Use Scenario: Long-term health monitoring of isolated 24V and 5V rails powering analog I/O, communication interfaces, and safety controllers in factory automation PLCs. IC Role / Device Role / Timing Role: Measures supply voltages and internal die temperature continuously; logs min/max values in nonvolatile registers for predictive maintenance analysis. Use Value: Extends mean time between failures (MTBF) by 3.7× through early identification of aging capacitors and thermal stress degradation. |
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 |
|---|---|---|---|
| LTC2972IUF#PBF | Single 16-bit ADC channel, no IDACs, no tracking; adds PMBus v1.2 compliance and EEPROM. | Targeted at simpler monitoring-only use cases without servo or sequencing needs. | Select when only telemetry logging and alerting are required - not suitable for closed-loop voltage control. |
| TPS544B20RVFT | Integrated buck controller with internal FETs and PMBus interface; lacks dual independent servo channels and tracking logic. | Designed for direct power conversion, not external DC/DC supervision - requires redesign of power stage topology. | Choose only if replacing entire regulator; cannot substitute for LTC2970IUFD-1#PBF's external supervisory role. |
Compared with LTC2970IUFD-1#PBF, LTC2972IUF#PBF offers higher ADC resolution but no margining capability, while TPS544B20RVFT integrates power delivery but removes flexibility for retrofitting legacy DC/DC converters - making LTC2970IUFD-1#PBF uniquely suited for precision external supervision with hardware-enforced sequencing.
Availability
LTC2970IUFD-1#PBF is available at Aetrix Electronics and suitable for server VRM validation, telecom power sequencing, FPGA power management, industrial PLC supervision, and embedded computing applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC2970IUFD-1#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 digital signal processing semiconductors, serving aerospace, industrial, automotive, and communications markets.
The LTC2970 product line was designed specifically for intelligent power supply supervision in high-density computing and infrastructure systems, emphasizing accuracy, fault resilience, and hardware-assisted sequencing without host processor intervention.
FAQ
What distinguishes LTC2970IUFD-1#PBF from the standard LTC2970IUFD#PBF?
The LTC2970IUFD-1#PBF includes hardware tracking functionality for coordinated power supply sequencing - a feature absent in the base LTC2970IUFD#PBF. This enables synchronized ramp-up/down of multiple supplies using SYNC commands and GPIO_CFG state control, critical for FPGA and ASIC power integrity. The -1 suffix denotes this enhanced capability, confirmed in the official Linear Technology datasheet revision 29701fe.
Does LTC2970IUFD-1#PBF require external components for basic servo operation?
Yes - LTC2970IUFD-1#PBF requires two external resistors per channel to connect VOUT0/VOUT1 to the DC/DC converter feedback node, and bypass capacitors (100 nF) on VDD, 12VIN, and REF pins. No external reference or calibration components are needed due to its integrated 1.229 V reference and ±0.5% ADC accuracy. These requirements are specified in the "Typical Application" and "Pin Functions" sections of the LTC2970 datasheet.
Can LTC2970IUFD-1#PBF operate without a 12V supply?
Yes - LTC2970IUFD-1#PBF can operate from a 4.5 V to 5.75 V VDD supply alone; the 12VIN pin may be tied to VDD if no 12 V source is available. In this mode, the internal 5 V regulator is disabled, and the device draws power directly from VDD. This configuration is explicitly supported in the Absolute Maximum Ratings and Pin Functions sections of the datasheet.
How does the soft-connect feature prevent output voltage disturbance in LTC2970IUFD-1#PBF?
The soft-connect feature in LTC2970IUFD-1#PBF initializes the IDAC output to the code closest to the existing feedback node voltage before engaging - eliminating step-induced transients. This is implemented in hardware via the servo algorithm and voltage buffer design, ensuring zero-voltage-step engagement. The mechanism is detailed in the "Operation" section (page 13) and "Soft Connecting…" application note (page 20) of the datasheet.
What is the maximum number of LTC2970IUFD-1#PBF devices supported on a single I²C bus?
Up to nine LTC2970IUFD-1#PBF devices can share one I²C bus, as ASEL0 and ASEL1 pins support nine unique slave address configurations (via VDD, GND, or floating states). This is documented in the "Order Information" table and "Pin Configuration" section of the datasheet, and verified on Analog Devices' product page for LTC2970.
LTC2970IUFD-1#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-1#PBF FAQ
1.How can I place an order for LTC2970IUFD-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2970IUFD-1#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-1#PBF reliable?
The price and inventory of LTC2970IUFD-1#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-1#PBF is usually 5 days.
3.What payment methods are accepted for LTC2970IUFD-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2970IUFD-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2970IUFD-1#PBF?
LTC2970IUFD-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2970IUFD-1#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-1#PBF?
For technical support, including LTC2970IUFD-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2970IUFD-1#PBF requirements.
6.How does Aetrix verify that LTC2970IUFD-1#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2970IUFD-1#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-1#PBF meets industry standards.
7.What is the process for return or replacement of LTC2970IUFD-1#PBF?
All LTC2970IUFD-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2970IUFD-1#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-1#PBF part is unused and in its original packaging.
Return procedure for LTC2970IUFD-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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