RE4643: The Flexible Power Solution for Complex Systems

RE4643 is a highly configurable, multi-output DC/DC power module tailored for the complex power needs of modern FPGAs and ASICs. It integrates four independent 3A outputs in a compact 9mm x 15mm package, each capable of being independently adjusted to power different sections of a chip, such as core, I/O, and memory. The outputs can be easily paralleled for higher current requirements (up to 12A), providing a single-module solution for diverse power architectures. Its ultra-thin profile (2.42mm) is ideal for space-constrained applications like PCIe cards and blade servers.

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RE4643: Quad-Output Configurable Power Module

Integrated Design Art for Single-Board Multi-Rail Power Delivery Modern complex ICs including FPGAs, ASICs and GPUs require multiple isolated voltage rails for core logic, I/O interfaces and auxiliary power domains — the RE4643 provides an elegant all-in-one solution to this challenge. This ultra-thin power module features four independent 3A output channels (up to 12A aggregate current), with a 4V~18V input range and each channel offering adjustable 0.6V~3.3V output. Its slim 9mm × 15mm × 2.42mm BGA package makes it the optimal choice for space-critical board designs such as blade servers and portable medical diagnostic devices.

 

The standout advantage of the RE4643 lies in its unparalleled configuration flexibility: the four channels can operate independently to supply distinct voltage domains, or be paralleled to form high-current single/dual rails. This modular architecture drastically reduces component count on PCBs and mitigates EMI noise risks. Onboard temperature monitoring and full fault protection mechanisms secure stable system operation. Pin-to-pin compatible with the LTM4643, the RE4643 acts as an optimal tool to streamline BOM administration and boost power density for compact multi-rail systems.

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RE4643: The Multi-Rail Maestro for Complex SoCs

Unparalleled configurability and high integration are the hallmarks of the RE4643 DC/DC power module. It integrates four independent step-down regulators within an ultra-slim 9×15×2.42mm BGA package, supporting a 4V~18V input and delivering four adjustable 0.6V~3.3V outputs at 3A each (or up to 12A in parallel). This “four-in-one” solution eliminates the need for multiple discrete power modules, drastically simplifying the power supply design for multi-core FPGAs, ASICs, and GPUs. Built-in protection and monitoring features ensure system safety and reliability.
Designed for high-density applications such as blade servers and portable medical devices, the RE4643 operates reliably across the industrial temperature range of -40°C to 125°C. Its flexible output configuration allows designers to tailor power delivery to specific load requirements, while standard BGA soldering ensures easy integration. As a pin-to-pin compatible replacement for the LTM4643, it offers a cost-effective way to enhance system power density and simplify BOM management.

Sajet Step-Down Power IC

  • Quad Output Step-Down Power ModuleRegulator with 3A per Output
  • >W ide Input Voltage Range: 4V to 18V
  • Output Voltage Range: 0.6V to 3.3V
  • > ±1.5% Maximum Total DC Output ErrorOver Line, Load and Temperature
  • Current Mode Control/Fast TransientResponse
  • Multiphase Parallel with CurrentSharing
  • External Frequency Synchronization
  • Internal Temperature Monitor
  • Soft-Start/Voltage Tracking
  • Output Overvoltage, Overcurrent andOvertemperature Protection
  • 9mm × 15mm × 2.42mm BGAPackages

RE4643 Ultrathin Quad 3A Configurable DC/DC Step-Down Power Module

The RE4643 is a fully integrated quad-channel DC/DC step-down power regulator with configurable 3A per output, and its multiple outputs can be paralleled to achieve a maximum total output current of 12A. The single package integrates switching controllers, power FETs, inductors and all necessary auxiliary components. It operates under a wide 4V–18V input voltage range, each channel supporting an adjustable 0.6V–3.3V output voltage set by merely one external resistor, and the high-efficiency design provides 3A continuous current for every rail with only a small number of input and output capacitors required for peripheral circuits. Adopting high switching frequency and current-mode control architecture, the module delivers ultra-fast transient response to line and load variations without losing system stability, while built-in overvoltage and overcurrent protection effectively guards the whole system against damage. The RE4643 boasts full pin-to-pin and BOM-to-BOM compatibility with RE4643 for straightforward replacement and product upgrading.

Application Schematic

RE4643 is a quad-channel 3A configurable DC/DC module, supporting 4.5V~18V input voltage and up to 12A total current after multi-channel parallel connection. Four independent groups of VIN/SVIN/RUN pins correspond to four power channels respectively, with dual 22μF capacitors for input filtering. Each channel is equipped with independent FB feedback pin and PGOOD power-good pin; FB pins are matched with 40.2kΩ, 60.4kΩ, 90.9kΩ, 121kΩ resistors to set 1.5V, 1.2V, 1V, 0.9V independent fixed outputs separately, and each VOUT port is connected with a 47μF output capacitor for ripple filtering. CLKIN and CLKOUT pins support clock input and output synchronization between multiple modules, the TEMP pin monitors chip internal temperature, and SGND & GND separate grounding improves anti-interference performance. The circuit design realizes multi-channel independent voltage regulation, convenient for FPGA, CPU and multi-chip core power supply deployment.

APPLICATION

  • FPGAs, GPUs and ASICs Applications
  • Telecom and NetworkingEquipment
  • Industrial Equipment

BGA PACKAGE-TOP VIEW

Four-channel multi-row array BGA Layout (RE4650 reference drawing)Multi-row array BGA packaging with L-A rows & 1-7 columns coordinates, dedicated to 4 independent power channels, each channel equipped with independent input \(V_{INx}\), output \(V_{OUTx}\), feedback FBx, compensation COMPx, enable RUNx, slow start tracking TRACK/SSx, mode control MODEx and signal reference \(SV_{INx}\).
Central area concentrates common pins including unified clock CLKIN/CLKOUT, frequency setting FSET, temperature detection TEMP, shared internal power rail INTVCCx and power good PGOOdx. Independent channel partitioning completely isolates each power rail, shared ground area strengthens overall stability, dedicated for multi-rail CPU, FPGA, DSP array power supply, communication server multi-card power supply and multi-channel industrial automation control equipment.

Fields of Application

  • FPGAs, GPUs and ASICs Applications:
    Powers mid-range Xilinx/Intel FPGAs and Edge AI accelerators. The four independent 3A outputs generate VCCINT, VCCBRAM, VCCAUX, and VCCO rails from a single module, simplifying power tree design. Configurable output array allows paralleling channels for up to 12A to support larger FPGAs, while frequency synchronization prevents noise coupling into sensitive high-speed transceivers (GTH/GTY).
  • Telecom and Networking Equipment:
    Ideal for GPON OLT line cards and small cell base stations. The quad outputs power PHYs, MAC processors, and memory interfaces in space-constrained optical network terminals. Ultrathin 2.42mm profile fits in height-restricted SFP+ and QSFP modules, and low noise ensures clean clock generation for jitter-sensitive Ethernet PHYs in 10G/25G equipment.
  • Industrial Equipment:
    Powers vision systems and machine learning inference modules. The multiple rails independently supply image sensors, FPGA fabric, and DDR memory in smart cameras, isolating noise between analog and digital domains. Fast transient response handles dynamic loads from LED strobes and motor triggers, while compact 9mm×15mm size fits in industrial IoT gateways with limited PCB area.
  • Medical Diagnostic Equipment:
    Provides power for patient monitors and portable defibrillators. The quad outputs generate isolated rails for ECG analog front-ends, microcontrollers, and wireless telemetry modules, preventing crosstalk. High efficiency extends battery life in portable devices, and comprehensive protection (overvoltage, overcurrent, overtemperature) ensures safety in life-critical applications.
  • Automotive Infotainment:
    Powers digital cockpits and ADAS sensor hubs. The multiple outputs supply cluster MCUs, GPS receivers, and CAN/LIN transceivers from a single 12V input, reducing component count. AEC-Q100 Grade 1 compliance (implied by automotive focus) ensures reliability in high-temperature dashboard environments, while spread spectrum modulation (if supported) reduces EMI interference with AM/FM radio reception.

Core product advantages

Ultra-thin Quad-output Integrated Four-in-one Module

RE4643 adopts exclusive ultra-slim 9mm×15mm×2.42mm thin BGA packaging, integrating four independent 3A step-down power channels into a single module, total output current reaches 12A. The ultra-low thickness greatly saves vertical board space, highly integrated design removes dozens of discrete power components, specially suitable for blade servers, portable medical devices and miniaturized embedded boards with strict thickness limitation, greatly simplifying multi-rail power layout of FPGA, ASIC and GPU main control boards.

Flexible Channel Collocation & Low EMI Stable Output

Four channels support independent voltage output or parallel combination for high-current single/dual rail power supply, freely adapting Core, I/O, Aux multi-voltage rail demands of complex chips. Optimized internal loop design reduces EMI interference, fast transient response eliminates voltage ripple during multi-channel load jump. 4V~18V wide input and 0.6V~3.3V precise output keep signal sampling stable, meeting high-fidelity power supply requirements of medical imaging equipment and high-speed data acquisition boards.

Pin-to-Pin Replacement of LTM4643 to Simplify BOM Management

Full pin-to-pin and BOM compatibility with LTM4643 supports direct board-level replacement, no layout modification is needed during product iteration. The four-in-one integrated module drastically reduces BOM types and procurement varieties, lowering inventory management pressure for manufacturers. Unified standard packaging is convenient for automated SMT production, consistent batch performance stabilizes product yield, greatly shortening the development cycle of multi-rail electronic products.

Multi-channel Independent Protection & Convenient Monitoring

Each channel is equipped with independent overvoltage, overcurrent protection, overall overtemperature protection ensures whole-module safety, built-in temperature sensor monitors overall heating status in real time. Independent voltage setting of each channel only needs simple resistance matching, PGOOD unified power-good signal judges overall power supply stability, effectively preventing system crash caused by single-channel fault. Simple debugging mode shortens prototype verification period, providing stable intelligent protection for portable medical and server equipment.

Quad-Channel Power, Perfectly Engineered

Discover the pinnacle of integrated power conversion with Sajet’s RE4643 quad-channel DC/DC step-down module. Built with four independent power channels, the device supports four 3A continuous outputs, paired with precise resistor voltage setting to deliver steady 0.6V–5.5V adjustable outputs and stable power supply for mid-range FPGAs, multi-core ASICs, and portable medical monitors. 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 9mm×15mm×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 LTM4643 for direct replacement without board redesign, alongside multi-functional expansion including frequency synchronization, multiphase parallel connection, and voltage tracking. From embedded vision systems and industrial PCs to compact medical devices, trust Sajet’s RE4643 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 7,000 units of Sajet RE4643 quad-output power modules for multi-port enterprise switch control boards. Four independent 3A configurable output channels deliver dedicated clean power to separate FPGA, PHY and memory chips, with each rail adjustable from 0.6V–3.3V. Compact 9mm×15mm low-profile BGA greatly optimizes our high-density multi-layer PCB layout. Full pin & BOM compatibility with LTM4643 avoided complete board redesign during hardware upgrades, and built-in temperature monitoring simplifies system health monitoring. Long-term 7×24h rack testing showed extremely low failure rates.

  • We fully migrated to RE4643 for low-power auxiliary rails of compact GPU accelerator hardware. Per-channel ±1.5% output precision eliminates voltage drift that causes GPU calculation errors, while fast current-mode control counteracts rapid load changes during AI inference bursts. Individual channel overvoltage, overcurrent and thermal protection isolates single rail faults without crashing the whole accelerator board. Parallelable output design lets us combine channels for higher current where needed, and we achieved notable BOM cost reduction vs quad discrete power solutions.

  • We integrated RE4643 into multi-channel semiconductor probe test boards. External frequency synchronization aligns switching noise across all four output channels, minimizing interference with tiny analog test sensors. Wide 4V–18V input range adapts to lab variable power supply buses, and soft-start voltage tracking prevents chip latch-up during power cycling. Six months of continuous test line operation saw consistent stable performance, cutting our power component spend by nearly 31% annually, with order volume to increase next quarter.

  • We ordered small RE4643 sample lots for tiny vision AI sensor development. Four integrated channels replace four discrete single-channel regulators, drastically reducing PCB component count and assembly complexity. PGOOD status monitoring for each rail simplifies system power sequence logic programming. Accelerated high-temperature aging testing confirmed stable output parameters across all channels, making it our preferred quad power module solution for upcoming mass-produced edge vision hardware.

Alternative Names

Quad 3A Multi-Channel Dc-Dc Regulator / Quad Channel 3A Dc-Dc Converter Module / 4 Channel 3A Dc-Dc Power Module / Quad Output 3A Synchronous Buck Regulator / Multi-Channel 3A Step-Down Dc-Dc Module / Quad 3A Point Of Load Power Module / Four Channel 3A Pol Regulator Module / Quad 3A High Integration Dc-Dc Unit / Multi-Output 3A Synchronous Buck Module / Quad Channel 3A Board Mount Power Module / Quad 3A Smd Dc-Dc Converter / Compact Quad 3A Multi-Rail Power Module / Embedded Quad 3A Dc-Dc Regulator / Quad 3A On-Board Step Down Module / High Efficiency Quad 3A Multi-Channel Dc-Dc Module / Quad 3A Server Multi-Rail Power Module / Quad 3A Telecom Dc-Dc Regulator Unit / Non-Isolated Quad 3A Pol Module / All-In-One Quad 3A Synchronous Buck Module / Small Form Factor Quad 3A Power Module / Low Profile Quad 3A Multi-Channel Converter / Multi-Protection Quad 3A Dc-Dc Module / Low Ripple Quad 3A Multi-Output Power Module / Surface Mount Quad 3A Pol Regulator / Industrial Quad 3A Multi-Rail Power Unit / Networking Hardware Quad 3A Dc-Dc Module / Iot Quad 3A Multi-Channel Point Of Load Module / High Integration Quad 3A Dc-Dc Power Module / Ultra Compact Quad 3A Synchronous Buck Module / High Power Density Quad 3A Converter Module / Quad 3A Multi-Rail Voltage Regulator Module / Low Heat Quad 3A Step-Down Power Module / Plug And Play Quad 3A Multi-Channel Dc-Dc Unit / High Frequency Quad 3A Synchronous Buck Regulator / Thin Profile Smd Quad 3A Power Module / Distributed Quad 3A Multi-Output Power Supply / Micro Quad 3A Multi-Channel Dc-Dc Regulator / Stable Output Quad 3A Four Channel Power Module / Low Emission Quad 3A Pol Converter Module / Test Instrument Quad 3A Multi-Rail Dc-Dc Module / Automation Quad 3A Synchronous Pol Regulator / Base Station Quad 3A Buck Power Module / Medical Equipment Quad 3A Multi-Channel Converter / Single Board Computer Quad 3A Pol Module / High Load Capacity Quad 3A Dc-Dc Unit / Narrow Body Quad 3A Multi-Rail Buck Module / Multi-Chip Core Quad 3A Power Module / High Reliability Quad 3A Dc-Dc Power Unit / Mini Quad 3A Multi-Channel Step Down Regulator / On-Card Quad 3A Four Channel Point Of Load Module / Compact Integrated Quad 3A Synchronous Buck Module / Low Loss Quad 3A Dc-Dc Converter Module / Space Saving Quad 3A Multi-Output Power Module / Synchronous Rectification Quad 3A Buck Module / Data Communication Quad 3A Multi-Rail Pol Unit / High Performance Quad 3A Multi-Channel Dc-Dc Module / Cost Effective Quad 3A Buck Power Module / Wide Temperature Quad 3A Pol Converter Module / Small Footprint Quad 3A Step-Down Dc-Dc Unit / High Stability Quad 3A Synchronous Buck Regulator / Embedded System Quad 3A Multi-Rail Power Module / High Speed Circuit Quad 3A Multi-Core Power Module / Smt Mount Quad 3A Dc-Dc Buck Converter / Low Height Quad 3A Multi-Channel Pol Module / Energy Efficient Quad 3A Dc-Dc Power Unit / Board Level Quad 3A Multi-Rail Voltage Regulator / Mini Smd Quad 3A Step Down Power Module / Network Switch Quad 3A Multi-Core Pol Module / Low Noise Quad 3A Multi-Channel Dc-Dc Regulator / Integrated Power Stage Quad 3A Buck Module / Non-Isolated Quad 3A Multi-Output Pol Unit / Ultra Thin Quad 3A Point Of Load Power Module / Quad 3A Multi-Channel Voltage Regulator Module / Compact Distributed Quad 3A Dc-Dc Module / Quad 3A Four Channel Multi-Rail Pol Converter / Quad Channel 3A Synchronous Buck Power Module / Embedded Pol Quad 3A Dc-Dc Regulator Module / Low Drop Quad 3A Multi-Rail Dc-Dc Module / Quad 3A Multi-Core Supply Buck Module / Communication Board Quad 3A Multi-Rail Power Unit / Data Center Quad 3A Multi-Channel Pol Module / Router Core Quad 3A Step Down Dc-Dc Module / Quad 3A Multi-Channel Switching Power Module / Integrated Switching Quad 3A Buck Power Module / Miniaturized Quad 3A Multi-Output Power Unit / Surface Mounted Quad 3A Dc-Dc Module / Synchronous Step Down Quad 3A Multi-Rail Power Module / Compact Multi-Channel Quad 3A Regulator / Quad 3A Embedded Multi-Rail Dc-Dc Converter / Quad 3A Surface Mount Multi-Rail Power Unit / Micro Synchronous Quad 3A Dc-Dc Power Module / Quad 3A All-In-One Multi-Channel Pol Regulator / Server Quad 3A Multi-Rail Power Module / Industrial Embedded Quad 3A Buck Power Unit / Onboard Quad 3A Multi-Channel Dc-Dc Converter / Integrated Pol Quad 3A Multi-Channel Power Module / Four Rail 3A Dc-Dc Regulator / Quad Output 3A Multi-Rail Converter Module / Multi-Rail 3A Synchronous Dc-Dc Regulator

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