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Analog Devices Inc. DC1668B-A
- Part No.:
- DC1668B-A
- Manufacturer:
- Analog Devices Inc.
- Package:
- Datasheet:
-
DC1668B-A.pdf
- Description:
- EVAL BOARD FOR LTM4627
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Product details
Overview
LTM4627 from Analog Devices (formerly Linear Technology) is a 15A, 0.6V–5V output, high-efficiency µModule® DC/DC step-down regulator with integrated power FETs, inductor, controller and compensation. It operates from 4.5V to 20V input, delivers ±1.5% total DC output error, supports current sharing up to 60A across four units, and is used in telecom server power rails requiring compact, thermally robust point-of-load conversion.
For engineers reviewing the LTM4627 datasheet, LTM4627 pinout, LTM4627 application, or LTM4627 equivalent, this page provides verified technical context, validated pin functions, confirmed package dimensions (15mm × 15mm × 4.32mm LGA / 4.92mm BGA), real-world transient response data (20µs settling for 50% load step), and two rigorously validated alternative parts for multi-source design flexibility.
Technical Context
The LTM4627 implements constant-frequency current-mode control with internal 0.47µH inductor, enabling fast transient response (20µs settling time) and stable operation with all-ceramic output capacitors. Its architecture integrates differential remote sensing for ≤3.3V outputs, programmable switching frequency (400–770kHz), and selectable operating modes via MODE_PLLIN pin: Burst Mode (floating), Pulse-Skipping (tied to INTVCC), or Forced Continuous (tied to GND).
It supports multiphase synchronization via MODE_PLLIN clock input (250–800kHz) and fSET resistor programming, while VFB-based output voltage setting uses a precision 60.4kΩ internal resistor. Thermal performance is characterized with θJCbottom = 4.6°C/W (LGA) and θJA = 16.6°C/W, validated under 12VIN/1.5VOUT/15A conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 15A continuous - supports full-rated load without derating at TA ≤ 85°C with proper PCB copper area |
| Input Voltage Range | 4.5V to 20V - compatible with 5V, 12V, and 19V intermediate bus architectures |
| Output Voltage Range | 0.6V to 5V - set by single external RFB resistor; default 0.6V when RFB open |
| Total DC Output Error | ±1.5% - includes line, load, temperature, and initial tolerance; enables tight regulation without calibration |
| Switching Frequency | 400kHz to 770kHz - adjustable via fSET resistor; synchronized externally from 250kHz to 800kHz |
| Efficiency (12VIN, 3.3VOUT) | Up to 93% - measured at 15A; enables >10W power delivery in <225mm² footprint |
| Transient Response | 60mV peak deviation, 20µs settling - for 0%→50%→0% load step at 12VIN/1.5VOUT |
Pinout & Package
Available in two thermally enhanced surface-mount packages: 133-lead 15mm × 15mm × 4.32mm LGA and 133-lead 15mm × 15mm × 4.92mm BGA. Both packages share identical pin numbering and function mapping per Linear Technology documentation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (A1–A6, B1–B6, C1–C6) | Power Input | Distributed high-current input path; requires local 22µF ceramic decoupling per group |
| VOUT (J1–J10, K1–K11, L1–L11, M1–M11) | Power Output | Multi-pin parallel output path; connects directly to bulk output capacitors and load |
| GND (B7, B9, C7, C9, D1–D6, D8, E1–E7, E9, F1–F9, G1–G9, H1–H9) | Power Ground | Common return for input/output power loops; must be tied to single-point ground plane |
| PGOOD (F11, G12) | Open-Drain Status | Asserts low when VOUT deviates >±10%; internally tied - use one pin only |
| MODE_PLLIN (A8) | Mode Control / Sync Input | Selects Burst (float), Pulse-Skipping (INTVCC), Forced Continuous (GND), or syncs to external clock |
| fSET (B12) | Frequency Programming | Resistor-to-GND sets nominal frequency; voltage input enables fine tuning or synchronization |
| TRACK/SS (A9) | Soft-Start / Tracking | 1.2µA pull-up enables RC soft-start ramp; accepts external voltage for rail sequencing |
| VFB (F12) | Feedback Reference | Connects to internal 60.4kΩ resistor; external RFB to GND programs output voltage |
| RUN (A10) | Enable Control | Turns on above 1.25V; internal 5.1V Zener protects against overvoltage |
| INTVCC (A7, D9) | Internal 5V LDO | Supplies control circuitry and gate drivers; 100mA current limit; ties to EXTVCC when bypassed |
| EXTVCC (E12) | External Bias Input | Bypasses INTVCC LDO when >4.7V supplied; must remain < VIN during all power sequences |
| VOUT_LCL (L12) | Local Feedback Node | Connects to VOUT via 1MΩ and to VFB via 60.4kΩ; driven by DIFF_OUT in remote sense mode |
| VOSNS+, VOSNS– (J12, M12) | Remote Sense Inputs | Used only for VOUT ≤ 3.3V; connect to load-side VOUT/GND points to cancel IR drop |
| DIFF_OUT (K12) | Remote Sense Output | Drives VOUT_LCL in remote sense configuration; float otherwise |
Key Features
| Feature | Design Value |
|---|---|
| Complete 15A µModule® Power Supply | Integrates controller, MOSFETs, inductor, and compensation - eliminates layout-sensitive loop tuning |
| Differential Remote Sensing | Enables <±0.5% load regulation for ≤3.3V outputs by rejecting PCB trace resistance errors |
| Parallel Current Sharing (up to 60A) | Current-mode architecture + COMP pin tie allows precise load balancing across 4 units without external DACs |
| Selectable Light-Load Operation | Burst Mode (IQ = 17mA), Pulse-Skipping (IQ = 25mA), or Forced Continuous - optimized for efficiency vs. ripple trade-offs |
| Output Voltage Tracking | TRACK/SS pin supports coordinated startup/shutdown sequencing of multiple rails (e.g., core + I/O) |
| Overvoltage & Overcurrent Protection | Hardware-based OVP (>10%) and foldback current limiting prevent damage during fault conditions |
Applications
| Telecom Server Core Rails | ATCA Carrier Card Power |
|---|---|
Use Scenario: Providing 1.2V/15A to FPGA or ASIC cores in high-density 19-inch rack servers with strict thermal limits. IC Role / Device Role / Timing Role: Primary point-of-load regulator delivering tightly regulated, low-noise supply with fast transient response to digital logic. Use Value: Achieves 93% efficiency at full load, reducing board-level heat by >3W versus discrete solutions; 20µs transient settling prevents logic upset during burst traffic. |
Use Scenario: Powering multiple 3.3V/10A peripheral slots on AdvancedTCA carrier cards with hot-swap capability. IC Role / Device Role / Timing Role: High-current, thermally robust DC/DC module supporting parallel operation and rail sequencing. Use Value: Enables 4-phase 60A solution with matched current sharing and synchronized switching to minimize input ripple on shared backplane. |
| Industrial PLC CPU Modules | Medical Imaging Subsystem Power |
Use Scenario: Delivering 2.5V/12A to ARM-based controllers in ruggedized programmable logic controllers with wide ambient temperature range. IC Role / Device Role / Timing Role: Industrial-grade power module with –40°C to 125°C operation and robust fault protection. Use Value: Maintains ±1.5% regulation across temperature; overvoltage lockout prevents damage to sensitive I/O peripherals during brownout recovery. |
Use Scenario: Generating 1.5V/15A for high-speed ADC/DAC signal chains in portable ultrasound or MRI subsystems requiring ultra-low noise. IC Role / Device Role / Timing Role: Low-ripple, low-EMI power source with remote sensing to ensure accuracy at point-of-load. Use Value: Differential sensing cancels up to 50mΩ PCB resistance error; Burst Mode extends battery runtime without compromising signal integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-current µModule® regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTM4638 | 20A output, 4.5V–26.5V input, 0.6V–3.3V output, smaller 9mm × 15mm × 4.32mm LGA | Better suited for space-constrained designs needing higher current but narrower output range | Choose LTM4638 when board area is critical and 3.3V max output suffices; not drop-in due to different pinout and feedback scaling |
| LTC3310S | 10A monolithic buck, 2.75V–5.5V input, 0.5V–VIN output, 3mm × 4mm QFN, no integrated inductor | Lower current, lower input voltage, requires external inductor and compensation components | Choose LTC3310S for cost-sensitive, low-power applications where board space permits external magnetics and design effort for loop tuning |
Compared with LTM4627, LTM4638 offers higher current in a smaller footprint but sacrifices output voltage flexibility and pin compatibility, while LTC3310S reduces BOM count versus discrete solutions but increases layout complexity and forfeits the µModule®'s guaranteed performance and thermal reliability.
Availability
LTM4627 is available at Aetrix Electronics and suitable for telecom infrastructure, industrial automation, and medical imaging systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging options (SnPb or SAC305).
Supply support for LTM4627 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. (ADI) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTM4627 belongs to ADI's µModule® regulator product line, engineered for designers needing complete, verified, high-current DC/DC solutions that eliminate magnetics selection, loop compensation, and thermal validation effort in space- and reliability-critical applications.
FAQ
What is the maximum output current rating of the LTM4627 under continuous operation?
The LTM4627 is rated for 15A continuous output current across its full operating temperature range (–40°C to 125°C) when used with appropriate PCB copper area and airflow. Derating curves in the datasheet specify reduced current at elevated ambient temperatures or with limited thermal dissipation. The LTM4627 achieves this rating using its integrated 0.47µH inductor and thermally optimized LGA/BGA package with θJCbottom = 4.6°C/W (LGA).
How does the LTM4627 implement remote voltage sensing, and for which output voltages is it recommended?
The LTM4627 implements remote sensing via dedicated VOSNS+ and VOSNS– pins connected to the load-side VOUT and GND, respectively, driving the DIFF_OUT amplifier output to VOUT_LCL. This feature is explicitly recommended for output voltages ≤3.3V to compensate for PCB trace IR drop. When unused, both VOSNS+ and VOSNS– must be grounded, and VOUT_LCL should be connected directly to VOUT.
Can multiple LTM4627 devices be synchronized and paralleled, and what is required to achieve balanced current sharing?
Yes - up to four LTM4627 units can be paralleled for up to 60A output. Synchronization is achieved by connecting the same external clock to all MODE_PLLIN pins. Balanced current sharing requires tying all COMP pins together and using identical external feedback resistors (RFB) across units. The current-mode architecture ensures inherent matching without additional current-sense resistors or DACs.
What are the key differences between Burst Mode, Pulse-Skipping Mode, and Forced Continuous Mode on the LTM4627?
Burst Mode (MODE_PLLIN floating) maximizes light-load efficiency by intermittently disabling switching, yielding IQ = 17mA. Pulse-Skipping Mode (MODE_PLLIN tied to INTVCC) skips cycles at light loads for higher efficiency than continuous mode while maintaining lower ripple than Burst Mode. Forced Continuous Mode (MODE_PLLIN tied to GND) ensures fixed-frequency operation with lowest output ripple but highest light-load quiescent current.
What is the minimum recommended input capacitance for the LTM4627 at 15A output, and why is it critical?
The minimum recommended input capacitance is 66µF (per datasheet Table "Decoupling Requirements"), typically implemented as three 22µF X7R ceramic capacitors placed close to VIN/GND pin pairs. This value ensures RMS ripple current handling and maintains low AC impedance at the module's switching frequency (400–770kHz), preventing input voltage droop and instability. Insufficient capacitance causes excessive VIN ripple, triggering PGOOD faults or premature overvoltage shutdown.
DC1668B-A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- µModule®
- Packaging:
- Box
- Product Status:
- Active
- Main Purpose:
- DC/DC, Step Down
- Outputs and Type:
- 1 Non-Isolated Output
- Voltage - Output:
- -
- Current - Output:
- 0.6V, 1V, 1.2V, 1.5V, 1.8V, 2.5V or 3.3V
- Voltage - Input:
- 30A
- Regulator Topology:
- 4.5V ~ 20V
- Frequency - Switching:
- Buck
- Contents:
- 500kHz
- Utilized IC / Part:
- Board(s)
- Power - Output:
- LTM4627
DC1668B-A FAQ
1.How can I place an order for DC1668B-A through Aetrix?
Please submit a Request for Quotation (RFQ) for DC1668B-A 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 DC1668B-A reliable?
The price and inventory of DC1668B-A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DC1668B-A is usually 5 days.
3.What payment methods are accepted for DC1668B-A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DC1668B-A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DC1668B-A?
DC1668B-A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DC1668B-A 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 DC1668B-A?
For technical support, including DC1668B-A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DC1668B-A requirements.
6.How does Aetrix verify that DC1668B-A is sourced from the original manufacturer or authorized distributors?
All DC1668B-A 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 DC1668B-A meets industry standards.
7.What is the process for return or replacement of DC1668B-A?
All DC1668B-A units undergo pre-shipment inspection (PSI). If there is an issue with DC1668B-A, 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 DC1668B-A part is unused and in its original packaging.
Return procedure for DC1668B-A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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