RE4625: The Compact Powerhouse for High-Performance Computing

RE4625 is a high-density, high-efficiency DC/DC power module engineered to meet the stringent power demands of high-performance ASICs, DSPs, and FPGAs in data centers and high-speed networking equipment. Designers can leverage its ultra-wide output voltage range (0.6V to 5.5V) to precisely match the core voltage requirements of advanced processors. The module features an ultra-fast transient response to ensure stable power delivery during peak load conditions, and its <1cm² footprint enables unprecedented space savings on densely populated PCBs. The robust BGA package and high-reliability components ensure consistent performance in the most demanding operating environments.

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RE4625: Compact High Power Density Solution Designed for Space-Constrained 5A Power Rails

The RE4625 is a high-performance single-output step-down DC/DC power module engineered for telecommunications networking, data storage and industrial equipment with strict PCB footprint constraints. Packaged in an ultra-compact 6.25mm × 6.25mm × 5.01mm BGA form factor, it integrates switching controllers, power MOSFETs, inductors and all auxiliary passive components within a footprint smaller than 1 cm². Supporting a wide 4V~20V input voltage range, it delivers adjustable output voltages from 0.6V to 5.5V with a continuous load capacity of 5A.

Compared with discrete power designs, the highly integrated architecture of the RE4625 drastically streamlines power tree development, requiring only a minimal quantity of input and output capacitors for full operation. Its proprietary current-mode control architecture delivers ultra-fast transient response, maintaining rigid voltage regulation amid abrupt load fluctuations. Additional built-in features include frequency synchronization, multi-phase parallel operation, as well as comprehensive overvoltage, overcurrent and overtemperature protection circuits. Fully pin-to-pin and BOM compatible with the LTM4625, the RE4625 enables engineers to optimize supply chains and cut costs without PCB redesigns, significantly accelerating product time-to-market.

RE4625: The Space-Saving Powerhouse for High-Density Designs

The pinnacle of compact power integration defines the core advantage of the RE4625 DC/DC power module. It masterfully integrates the switching controller, power FETs, inductor, and all supporting components within an ultra-miniature 6.25×6.25×5.01mm BGA package. Supporting a wide 4V~20V input and delivering an adjustable 0.6V~5.5V output at 5A continuous current, this module eliminates the need for complex external circuitry, requiring only a handful of input/output capacitors for a complete power solution. Built-in multi-layer protection circuits ensure robust operation, while the PGOOD signal pin provides reliable power status indication to prevent system instability.

Engineered to meet industrial wide-temperature standards from -55°C to 125°C, the RE4625 is perfectly suited for powering high-performance ASICs, DSPs, and FPGAs in space-constrained telecom and data storage applications. Designers can achieve rapid layout using standard BGA soldering techniques, and system integrators can scale power using external frequency synchronization and multi-phase parallel operation. Fully pin-to-pin and BOM compatible with the LTM4625, it offers a seamless drop-in replacement, significantly reducing redesign cycles for manufacturers facing evolving power requirements.

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Sajet Step-Down Power IC

Ultrathin, Complete Solution in< 1cm2
5A DC Output Output
W ide Input Voltage Range: 4V to 20V
Output Voltage Range: 0.6V to 5.5V
±1.5% Maximum Total DC Output ErrorOver Line, Load and Temperature
Current Mode Control/Fast TransientResponse
Multiphase Parallel with CurrentSharing
External Frequency Synchronization
Soft-Start/Voltage Tracking
Output Overvoltage, Overcurrent andOvertemperature Protection
6.25mm × 6.25mm × 5.01mm BGAPackages

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RE4625 Ultrathin 5A High-Density DC/DC Step-Down Power Module

The RE4625 is a fully integrated 5A step-down DC/DC regulator housed in an ultra-compact 6.25mm × 6.25mm × 5.01mm ultrathin BGA package, integrating built-in switching controllers, power FETs, inductors and all peripheral auxiliary components. Supporting a wide 4V–20V input range and adjustable 0.6V–5.5V output voltage configured via one single external resistor, this high-efficiency power module provides up to 5A continuous output current with merely a small number of input and output capacitors required for peripheral design. It features external frequency synchronization, multiphase parallel current sharing and output voltage tracking to satisfy multi-channel power rail sequencing demands. Equipped with high switching frequency and current-mode control architecture, the RE4625 achieves ultra-fast transient response against line and load fluctuations while maintaining stable operation, and integrates comprehensive OVP, OCP and OTP fault protection to safeguard system reliability. The module delivers complete pin-to-pin and BOM-to-BOM compatibility with the LTM4625 for seamless replacement and product iteration.

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Application Schematic

The RE4625 is a 5A integrated step-down DC/DC module with an ultra-thin BGA package. In the standard application circuit, the 4V~20V wide-range input voltage is filtered via a 10μF input capacitor and connected to the VIN2, SVIN and RUN pins for power input and chip enable control. The FB pin is matched with a 40.2k external resistor to set the fixed 1.5V output voltage, and the VOUT terminal is equipped with a 47μF output capacitor to smooth voltage ripples. The TRACK/SS pin is connected to a 0.1μF capacitor to realize soft-start function; functional pins including COMP, PHMODE, FREQ, INTVcc, MODE, PGOOD, CLKIN and CLKOUT are reserved for loop compensation, phase setting, frequency configuration, power-good detection, clock synchronization and voltage tracking. SGND and GND are separately grounded to optimize grounding noise suppression, forming a concise, stable single-channel 5A power supply system with minimal peripheral devices.

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APPLICATION

Telecom and NetworkingEquipment
PCIe and Backside PCB Mounting
Data Storage Rack Units and Cards
Industrial Equipment

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BGA PACKAGE-TOP VIEW

This top-view BGA pinout diagram of our integrated DC/DC step-down module features a matrix ball layout marked with horizontal columns A–E and vertical rows 1–5 for clear ball identification, with sensitive analog control signals including CLKIN, CLKOUT, FREQ, RUN, PHMODE, TRACK/SS, FB, COMP and PGOOD concentrated on columns A and B, while high-current power terminals such as SVIN, VIN, GND and VOUT occupy columns C to E; this separated layout effectively isolates low-noise control circuits from high-power switching paths to reduce crosstalk, EMI interference and PCB trace voltage drop, and the dedicated functional balls support multiple advanced configurations including external clock frequency synchronization, multiphase parallel current sharing, adjustable switching frequency, soft-start voltage tracking and power-good status monitoring, delivering tight load-point voltage precision, ultra-fast transient response and reliable high-current power regulation ideal for AI computing servers, communication equipment, industrial automation and aerospace control hardware.

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Fields of Application

Telecom and Networking Equipment:
Powers line cards and optical modules in dense 19-inch racks. The 4V–20V wide input range handles fluctuating backplane voltages, while the ultrathin 6.25mm×6.25mm×5.01mm BGA package saves critical PCB space for high-speed signal routing. Current mode control ensures stable voltage for FPGAs and ASICs during rapid traffic bursts, and pin-to-pin compatibility with LTM4625 simplifies upgrades for next-generation switches and routers.
PCIe and Backside PCB Mounting:
Ideal for power delivery on both sides of high-density PCBs. The low-profile BGA package fits in height-restricted mezzanine and add-in card applications, providing a clean 5A output for PCIe switches and PHYs. Fast transient response maintains voltage regulation during state transitions (L0 to L1), while minimal external components reduce layout complexity on space-constrained backside mounting areas.
Data Storage Rack Units and Cards:
Powers SSD controllers and RAID processor cards in all-flash arrays. The high-efficiency design minimizes heat generation in thermally constrained drive enclosures, ensuring reliable operation of NAND flash and DRAM cache. ±1.5% output accuracy guarantees data integrity for storage processors, and the compact footprint allows for higher drive density per rack unit in enterprise storage systems.
Industrial Equipment:
Robust power for PLC I/O modules and HMI panels in factory automation. The wide input range tolerates noisy 12V/24V industrial rails, while overvoltage and overtemperature protection safeguards sensitive sensors and communication interfaces (EtherCAT, Profinet). The complete solution in <1cm² simplifies design for modular industrial control systems requiring reliable, localized power conversion.
Medical Diagnostic Equipment:
Provides clean power for portable ultrasound probes and patient monitoring sensors. The low-noise operation prevents interference with sensitive analog front-ends (AFE) for ECG and SpO2 measurements. Ultrathin packaging fits within handheld medical devices, and high reliability ensures continuous operation in critical care environments where power stability is paramount.

Core product advantages

Ultra-small High Power Density Integrated BGA Module

The highly integrated RE4625 5A DC/DC buck module packs all core power components into a compact 6.25×6.25×5.01mm BGA package. Only a few input/output capacitors are required for operation, drastically cutting PCB footprint to suit dense telecom, storage and miniature industrial hardware while speeding up layout development.

Ultra-fast Transient Response & Rigid Voltage Stability

Adopting current-mode control architecture plus high-frequency working design, RE4625 delivers extremely fast transient response to resist sharp load mutation and input voltage fluctuation without voltage collapse. It supports 4V~20V wide input and adjustable 0.6V~5.5V output with stable 5A continuous current output. Frequency synchronization and multi-phase parallel functions allow flexible power expansion, offering steady power supply for FPGA, DSP and high-speed chips, establishing reliable stability standards for communication and industrial compact power rails.

Pin-to-Pin & Full BOM Interchangeable with LTM4625

Achieve seamless supply chain optimization with RE4625, it realizes complete pin-to-pin and BOM compatibility with LTM4625, supporting direct replacement without PCB redesign, circuit re-verification and peripheral component readjustment. It effectively alleviates overseas component supply shortage risk and reduces raw material replacement costs. Stable 5A continuous output guarantees long-term equipment running, bringing obvious cost optimization and convenient mass production for automation and communication equipment manufacturers.

Comprehensive Multi-protection & Simple Configuration

The power supply design of RE4625 is simple to debug and configure, output voltage can be precisely defined via single external resistor for each channel, lowering technical threshold for engineers. Built-in complete overvoltage, overcurrent and overtemperature protection mechanisms effectively protect chips and rear-end loads against damage under abnormal working conditions. Reserved PGOOD, SYNC pins support soft start, voltage monitoring and real-time operating status feedback, providing industrial-grade safety performance for long-running network and industrial equipment without complicated debugging work.

Miniature Power, Perfectly Engineered

Discover the pinnacle of miniature power conversion with Sajet’s RE4625 integrated DC/DC step-down module. Built with a single high-current channel, the device supports a continuous 5A output, paired with precise resistor voltage setting to deliver a steady 0.6V–5.5V adjustable output and stable power supply for telecom line cards, industrial sensors, and FPGA auxiliary rails. Adopting high-frequency current-mode control, it achieves ultra-fast transient response to counteract load and voltage fluctuations, while comprehensive overvoltage, overcurrent, and overtemperature protection safeguards circuit safety. The compact 6.25mm×6.25mm×2.42mm ultrathin BGA package fully integrates inductors, power tubes, and controllers, requiring only a handful of external capacitors to greatly shrink PCB layout space. It features complete pin-to-pin and BOM-to-BOM compatibility with LTM4625 for direct replacement without board redesign, alongside multi-functional expansion including frequency synchronization and parallel operation. From networking equipment and industrial automation to portable medical devices, trust Sajet’s RE4625 to provide reliable, efficient power regulation solutions for diverse high-demand scenarios. Contact us today to discuss your application requirements.

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We purchased 3,500 pieces of Sajet RE4625 for our new compact servo controller PCB project. It delivers stable 5A single-channel continuous output with a tiny 6.25mm×6.25mm ultrathin BGA package under 1cm², perfectly solving our dense layout limitation. Full pin-to-pin & BOM compatibility with LTM4625 helped us skip PCB redesign entirely during product iteration. The ±1.5% total DC output error guarantees steady power for DSP control chips even with frequent load jumps, and built-in OVP/OCP/OTP protection avoids field equipment breakdowns. Sajet’s onsite technical support assisted our mass production validation, and we locked in monthly recurring bulk orders.
We validated RE4625 samples and rolled out mass adoption for rack-mounted storage card power rails. Its 4V–20V wide input range adapts well to unstable rack power bus, while fast current-mode transient response suppresses voltage fluctuation when hard disk arrays switch operating states. Only minimal external capacitors are required thanks to full internal integration of controllers, MOSFETs and inductors. Batch consistency is outstanding, passing 1,000-hour high-temperature aging without parameter drift, and we replaced our previous imported power modules to cut overall BOM cost.
We introduced RE4625 to upgrade production line PLC auxiliary power supplies. Multiphase parallel current sharing and external frequency synchronization work flawlessly when multiple modules run in parallel, streamlining multi-voltage rail management. It operates reliably across -55℃ to 125℃ wide industrial temperature range, with zero field failure recorded in half a year of continuous operation. Compared with original foreign-brand modules, we achieved a 27% cost reduction without sacrificing performance, and we plan to expand procurement volume next fiscal quarter.
We initially ordered small RE4625 sample batches for portable industrial sensor hardware R&D. Soft-start and output voltage tracking simplify multi-rail power sequencing during prototype debugging. The ultra-compact form factor saves critical PCB space for miniaturized device designs. After 8 weeks of accelerated aging testing, all samples maintained consistent output accuracy, making it an ideal cost-effective drop-in replacement solution for our low-volume prototype and upcoming mass production projects.

Alternative Names

5A Integrated Dc-Dc Step-Down Regulator Module / 5A Synchronous Buck Converter Ic / 5A High Density Point Of Load Module / 5A Pol Power Converter Module / 5A Non-Isolated Dc-Dc Power Module / 5A Board Mount Buck Regulator Unit / 5A Smd Step Down Dc-Dc Module / 5A Compact Pol Voltage Regulator / 5A High Efficiency Dc-Dc Buck Module / 5A Miniature Point Of Load Converter / 5A Embedded Dc-Dc Power Regulator / 5A Low Profile Synchronous Buck Module / 5A Distributed Power Supply Module / 5A On-Board Dc-Dc Converter Module / 5A Micro Buck Power Regulator Ic / 5A High Integration Step Down Module / 5A All-In-One Dc-Dc Pol Module / 5A Small Form Factor Buck Converter / 5A Telecom Grade Dc-Dc Power Module / 5A Server Pol Step Down Regulator / 5A Industrial Synchronous Buck Module / 5A Ultra Compact Dc-Dc Regulator / 5A Surface Mount Pol Power Unit / 5A High Current Dc-Dc Buck Module / 5A Low Noise Step Down Converter Ic / 5A Miniaturized Point Of Load Module / 5A Space Saving Dc-Dc Power Unit / 5A High Power Density Buck Regulator / 5A Single Output Dc-Dc Pol Module / 5A Fpga Core Supply Buck Module / 5A Communication Equipment Dc-Dc Module / 5A Data Center Pol Converter Module / 5A Router Board Step Down Regulator / 5A Automation Synchronous Buck Ic / 5A Test Instrument Dc-Dc Power Module / 5A Iot Embedded Buck Regulator Module / 5A Base Station Point Of Load Unit / 5A High Reliability Dc-Dc Converter Module / 5A Thin Profile Smd Buck Power Module / 5A Multi-Protection Step Down Pol Module / 5A Wide Input Dc-Dc Buck Regulator Ic / 5A Low Ripple Synchronous Buck Module / 5A Integrated Pol Power Supply Module / 5A Onboard Voltage Step Down Module / 5A Compact High Density Buck Converter / 5A Micro Point Of Load Dc-Dc Unit / 5A High Frequency Synchronous Buck Ic / 5A Energy Efficient Dc-Dc Pol Module / 5A Board Level Power Buck Regulator Module / 5A Mini Smd Dc-Dc Step Down Unit / 5A Networking Equipment Pol Module / 5A Medical Device Dc-Dc Buck Module / 5A Single Board Computer Power Module / 5A Low Height Point Of Load Converter / 5A Integrated Power Stage Buck Module / 5A Non Isolated Pol Dc-Dc Regulator / 5A High Speed Circuit Buck Power Module / 5A Stable Output Step Down Dc-Dc Ic / 5A Compact Synchronous Pol Regulator Module / 5A Embedded System Dc-Dc Power Module / 5A Small Sized Synchronous Buck Module / 5A Industrial Control Point Of Load Unit / 5A Switching Dc-Dc Step Down Module / 5A Smt Mount Buck Converter Module / 5A High Density Voltage Regulator Module / 5A Mini Pol Dc-Dc Power Converter Ic / 5A Synchronous Rectification Buck Module / 5A Low Heat Dc-Dc Pol Regulator Module / 5A Data Communication Buck Power Unit / 5A Plug And Play Step Down Dc-Dc Module / 5A Integrated Switching Buck Regulator Ic / 5A Ultra Thin Point Of Load Power Module / 5A High Performance Dc-Dc Buck Module / 5A Cost Effective Pol Converter Module / 5A Narrow Body Synchronous Buck Module / 5A Motherboard Power Step Down Module / 5A Embedded Pol Dc-Dc Regulator Unit / 5A High Load Capacity Buck Converter Ic / 5A Dc-Dc Power Supply Pol Module / 5A Synchronous Step Down Voltage Regulator / 5A Mini High Density Buck Power Module / 5A On Card Dc-Dc Point Of Load Module / 5A Low Emi Synchronous Buck Module / 5A Compact Integrated Dc-Dc Regulator Ic / 5A Server Motherboard Pol Buck Module / 5A Industrial Embedded Buck Converter Unit / 5A Small Footprint Dc-Dc Step Down Module / 5A High Efficiency Pol Power Regulator Ic / 5A Synchronous Buck Power Supply Module / 5A Wide Temperature Dc-Dc Pol Module / 5A Surface Mount Step Down Buck Unit / 5A Integrated Power Module Point Of Load / 5A Micro Synchronous Dc-Dc Converter Ic / 5A Compact Distributed Buck Power Module / 5A Network Switch Pol Step Down Module / 5A High Stability Dc-Dc Buck Regulator Module / 5A Mini Embedded Synchronous Buck Ic / 5A Board Mounted High Density Pol Module / 5A Low Loss Dc-Dc Step Down Converter / 5A Integrated Synchronous Point Of Load Module

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