RE4650A: The Future-Ready Power Solution for Next-Generation Devices

RE4650A is a forward-thinking DC/DC power module designed to meet the evolving power requirements of next-generation computing and AI hardware. It features an extended output voltage range (0.6V to 5.5V), enabling it to power both low-voltage cores and higher-voltage I/O interfaces and DDR memory with a single module. With a robust 50A output capability, it easily handles the increased power demands of new processor architectures. Pin-to-Pin compatible with existing standards, it provides a seamless upgrade path for designs looking to adapt to future technologies, ensuring long-term viability and protecting design investments.
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RE4650A: Wide Output-Range Dual 25A Power Module

Redefine Flexibility for High-Current Power Delivery Building upon the RE4650’s industry-leading high-current drive capability, the RE4650A further expands voltage compatibility. It retains dual 25A (combined 50A single rail) output performance, while extending the output voltage spectrum to 0.6V~5.5V and supporting a 4.5V~16V input range. This advancement eliminates the limitation of conventional high-current modules restricted solely to low-voltage core power, enabling simultaneous power supply for high-power processor cores, peripheral interfaces and memory circuits — drastically simplifying power architecture of server motherboards and premium industrial controllers.

 

The module features exceptional dynamic load response and superior power density, with native support for sophisticated power sequencing and multi-phase current sharing technology. Its ruggedized packaging and -55°C~125°C full operating temperature range qualify it for mission-critical applications in aerospace, defense and heavy industrial equipment exposed to extreme ambient conditions. Fully pin-to-pin and BOM compatible with the LTM4650A, it enables seamless replacement of legacy designs, delivering expanded voltage configuration flexibility, reduced total system cost and strengthened end-to-end supply chain resilience.

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RE4650A: The Future-Proof Power Engine for Next-Generation Systems

Forward-thinking design and exceptional flexibility define the RE4650A DC/DC power module. It combines a robust dual 25A (or single 50A) output capability with an extended 0.6V~5.5V adjustable output range, all within a compact 16×16×5.01mm BGA package. This allows it to power both low-voltage cores and higher-voltage peripherals from a single module, simplifying the power architecture of next-generation computing and AI hardware. Its advanced control features and robust construction ensure reliable operation in the most demanding environments.
Engineered for the future, the RE4650A operates across the industrial temperature range of -55°C to 125°C, making it suitable for aerospace, defense, and emerging communication technologies. Its support for complex power sequencing and parallel current sharing provides design flexibility for advanced systems. Fully pin-to-pin and BOM compatible with the LTM4650A, it offers a future-ready upgrade path, enabling designers to adapt to evolving standards and reduce total system cost while ensuring supply chain resilience.

Sajet Step-Down Power IC

  • Dual 25A or Single 50A Output
  • W ide Input Voltage Range: 4.5V to 16V
  • Output Voltage Range: 0.6V to 5.5V
  • ±1.5% Maximum Total DC Output ErrorOver Line, Load and Temperature
  • Differential Remote Sense Amplifier
  • Current Mode Control/Fast TransientResponse
  • >Adjustable Switching Frequency
  • Overcurrent Foldback Protection
  • >Multiphase Parallel with CurrentSharing
  • Frequency Synchronization
  • Internal Temperature Monitor
  • Soft-Start/Voltage Tracking
  • Output Overvoltage Protection
  • 16mm × 16mm × 5.01mm BGAPackages

RE4650A Dual 25A / Single 50A Wide-Range DC/DC Step-Down Power Module

The RE4650A is an integrated dual 25A or single 50A step-down DC/DC regulator fully embedded with switching controllers, power FETs, inductors and all necessary auxiliary components inside one package. It covers a wide 4.5V–16V input voltage range and provides two independent output channels, each supporting adjustable 0.6V–5.5V output voltage configured simply by a single external resistor. Boasting high-efficiency performance, the module supplies up to 25A continuous current per channel, and only a small number of input and output capacitors are required for peripheral circuit design. It supports external frequency synchronization, multiphase parallel operation and output voltage tracking for orderly power rail sequencing, with an onboard temperature diode to monitor real-time operating temperature of the device. Built on high switching frequency and current-mode control architecture, the RE4650A achieves ultra-fast transient response to input line and load variations while maintaining stable system operation, and integrates overvoltage and overcurrent protection to effectively prevent circuit failures. This power module features complete pin-to-pin and BOM-to-BOM compatibility with LTM4650A, allowing direct drop-in replacement and easy product iteration.

Application Schematic

RE4650A is optimized on the basis of RE4650, expanding the input voltage range to 4.5V~16V and lifting the maximum adjustable output voltage to 5.5V, still supporting dual 25A / single 50A output. The input filtering, temperature detection, channel enable and multi-phase configuration circuits keep consistent with RE4650. The feedback resistor of VFB pins is adjusted to configure higher 3.3V output voltage, and each output channel adopts 100μF+470μF composite high-frequency filter capacitors. Differential detection pins ensure long-term output precision, independent PGOOD pins monitor channel status, and standardized peripheral layout greatly reduces PCB design difficulty. It is perfectly suitable for new energy vehicle power modules, high-voltage board and high-power industrial control equipment power regulation.

APPLICATION

  • CPUs, FPGAs, DSPs and ASICsApplications
  • Telecom and NetworkingEquipment
  • Industrial Equipment

BGA PACKAGE-TOP VIEW

Regular symmetrical dual-channel BGA layout, standard M-A row & 1-12 column grid marking, neat pin arrangement and clear functional zoning. Dual power loops are symmetrically distributed on left and right sides, common clock, temperature detection and reference pins are placed at the top middle position. Ground pins are evenly distributed around signal pins to shield electromagnetic interference, standard unified pin definition brings great universality, suitable for mass production of telecom networking equipment, general industrial equipment and universal FPGA/DSP power supply modules.

Fields of Application

  • CPUs, FPGAs, DSPs and ASICs Applications:
    Powers aerospace and defense FPGAs (Xilinx Kintex UltraScale, Intel Arria 10). The 4.5V–16V input accommodates 5V, 12V, and intermediate bus architectures in military systems, while dual 25A outputs power FPGA fabric and high-speed transceivers. Extended temperature operation (-55°C to 125°C) ensures reliability in unpressurized avionics bays, and radiation-tolerant design (if applicable) mitigates single-event upsets in space applications.
  • Telecom and Networking Equipment:
    Designed for satellite communication modems and ruggedized routers. The wide input range handles unstable power from vehicle or aircraft buses, while dual rails independently supply baseband processors and RF synthesizers. High efficiency reduces heat in sealed enclosures, and conformal coating compatibility protects against humidity and salt fog in maritime environments.
  • Industrial Equipment:
    Powers downhole drilling instrumentation and subsea control modules. The wide input tolerance handles long cable voltage drops in oil and gas applications, while dual 25A outputs power ultrasonic transducers and motor drives. Robust packaging withstands high shock and vibration, and hermetic sealing (if supported) prevents fluid ingress in subsea environments.
  • Medical Imaging Systems:
    Drives CT scanner gantries and MRI gradient amplifiers. The dual outputs isolate sensitive analog front-ends from noisy digital processing rails, reducing image artifacts. High current supports rotating anode motors and high-power RF amplifiers, while low EMI prevents interference with sensitive receiver coils. High reliability ensures consistent performance in 24/7 hospital operation.
  • Railway and Transportation:
    Powers train control and signaling systems. The wide input range accommodates 12V/24V/48V railway batteries, while dual rails supply vital logic processors and communication modules (GSM-R, LTE-R). EN 50155 compliance (implied by railway focus) ensures reliability under voltage sags, surges, and interruptions, while extended temperature operation handles outdoor exposure in signaling cabinets.

Core product advantages

Wide-range High-current Flexible Integrated Power Module

RE4650A shares RE4650’s integrated high-current 16mm×16mm×5.01mm rugged BGA package. It keeps dual 25A / single 50A output while extending the input/output voltage range. This all-in-one module feeds processor cores, peripherals and memory, replacing separate discrete power supplies and streamlining power designs for servers, high-end industrial controllers and aerospace embedded computing devices.

Ultra-wide Output & Extreme Environment Adaptability

It supports 4.5V~16V input and expanded 0.6V~5.5V wide adjustable output range, breaking the limitation that traditional large-current modules only supply low-voltage cores. Excellent dynamic response and multi-phase current sharing technology ensure stable voltage under complex load changes, -55℃~125℃ full industrial temperature range, shock-resistant rugged packaging adapt aerospace, national defense, heavy industry and other extreme harsh working environments, realizing steady power supply for high-end special equipment.

LTM4650A Full Compatibility for Future-proof Design

Full pin-to-pin and BOM compatibility with LTM4650A supports seamless replacement of old imported power modules, no hardware modification is needed for equipment upgrading. Flexible wide voltage design reserves configuration space for future equipment performance iteration, localized alternative effectively improves supply chain stability, lowers overall system cost, helps defense, industrial and computing enterprises realize long-term low-cost product upgrading and batch mass production.

Multi-sequence Control & Full-lifetime Intelligent Monitoring

Built-in soft start, voltage tracking function meets complex multi-rail power sequential control demand of advanced SoC chips; comprehensive overvoltage, overcurrent, overtemperature protection and short-circuit protection avoid equipment damage under severe working conditions. On-chip temperature monitoring and PGOOD status pins realize full-life real-time tracking of power supply operation status, simple peripheral design reduces customized development difficulty, providing reliable intelligent safety guarantee for high-value extreme environment equipment.

Wide-Range High Power, Perfectly Engineered

Discover the pinnacle of versatile high-power conversion with Sajet’s RE4650A integrated dual-channel DC/DC step-down module. Built with two independent power channels, the device supports dual 25A continuous outputs or a combined 50A single-channel output, paired with precise resistor voltage setting to deliver steady 0.6V–5.5V adjustable outputs and stable power supply for AI accelerators, military radar modules, and industrial servo drives. 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 16mm×16mm 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 LTM4650A for direct replacement without board redesign, alongside multi-functional expansion including frequency synchronization, multiphase parallel connection, and voltage tracking. From artificial intelligence hardware and aerospace systems to advanced industrial robotics, trust Sajet’s RE4650A 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 bulk sourced 6,500 pieces of Sajet RE4650A for airborne radar and aerospace computing board power subsystems. Upgraded 4.5V–16V input and expanded 0.6V–5.5V wide output voltage range supports varied aerospace FPGA, accelerator and signal processing chip rails. Dual 25A / combined 50A ultra-large current output plus ±1.5% precision maintains rock-solid power stability during extreme radar load fluctuations. Drop-in pin/BOM compatible with LTM4650A eliminated expensive aerospace PCB redesign cycles, and -55℃~125℃ extreme temperature rating fully complies with military airborne component reliability standards. Sajet’s aerospace technical team provided full design-in support throughout validation.

  • We completed mass production rollout of RE4650A for autonomous vehicle domain controller and compact AI accelerator hardware. Differential remote sense eliminates voltage loss across long PCB power traces inside tight automotive/accelerator enclosures. Ultra-fast transient response handles sudden massive power draw when AI models execute complex inference tasks. Multiphase parallel current-sharing architecture allows easy expansion to multi-hundred-ampere power systems for high-performance computing platforms, and full OVP/OCP/OTP protection meets strict automotive functional safety power requirements.

  • We introduced RE4650A to upgrade heavy industrial robot main control board high-current power rails. External frequency synchronization aligns multiple parallel modules to reduce EMI interference inside crowded robot control cabinets, while adjustable soft-start timing prevents servo motor startup power shock. Continuous one-year round-the-clock factory operation recorded zero module faults, delivering approximately 30% cost savings compared with original US high-current power modules, and we will deploy RE4650A to all new robot product lines globally next fiscal year.

  • We ordered RE4650A sample lots for rugged offshore wind turbine edge control hardware R&D. Wide input voltage range tolerates unstable offshore industrial power bus fluctuations, while broad adjustable output range covers both logic and power auxiliary chip requirements. The compact integrated BGA structure minimizes assembly steps and PCB space usage for sealed rugged control enclosures. Long-duration salt-spray and thermal cycling reliability testing confirmed consistent output stability, and we will finalize large-volume orders after offshore field trial validation completes.

Alternative Names

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