RE4644: The Integrated Masterpiece for Space-Conscious Designs

RE4644 is a marvel of integration, packing four powerful 4A outputs into an ultra-compact 9mm x 15mm package, setting a new standard for power density. Designed for applications where space is at a premium, such as portable medical devices and high-density data communication equipment, it offers the flexibility to configure outputs independently or in parallel for up to 16A of combined current. The module requires minimal external components, simplifying design and reducing the overall footprint. Its elegant, low-profile design allows for versatile mounting options, including on the reverse side of PCBs.
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RE4644: 4A Quad-Output General-Purpose Power Module

Multi-Rail Power Expert Balancing Performance & Versatility
The RE4644 is optimized for general industrial and networking equipment requiring multi-channel medium-current power supplies. It provides four independent 4A output channels (paralleling capable for up to 16A combined output), with a 4V~14V input voltage range and wide 0.6V~5.5V adjustable output. Compared to the RE4643, it delivers elevated per-channel current rating and expanded output voltage coverage, ideal for powering mixed-signal systems, DSP processors and multi-type sensor interface circuits.

 

Encapsulated in a 9mm × 15mm × 5.01mm BGA package, its slightly increased thickness delivers improved thermal resistance and higher power handling capacity. The module exhibits ultra-fast transient response to suppress voltage ripple induced by abrupt load steps. Beyond simplifying intricate multi-rail power architectures, built-in overcurrent, overvoltage and overtemperature protection substantially elevates end-product reliability. As a perfect drop-in substitute for the LTM4644, it allows engineers to implement cost reduction and shorten lead times without hardware redesign modifications.

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RE4644: The General-Purpose Powerhouse for Balanced Performance

A perfect blend of performance, versatility, and ease of use defines the RE4644 DC/DC power module. It integrates four independent 4A output channels within a compact 9×15×5.01mm BGA package, supporting a 4V~14V input and delivering adjustable 0.6V~5.5V outputs (or up to 16A in parallel). This makes it an ideal general-purpose solution for a wide range of applications, including mixed-signal systems, DSPs, and sensor interfaces. Its robust design and built-in protection circuits ensure long-term reliability in industrial environments.
Operating across the industrial temperature range of -40°C to 125°C, the RE4644 is a dependable choice for industrial control and networking equipment. Its fast transient response ensures stable power delivery during load transients, and its minimal external component count simplifies design and reduces PCB space. Fully pin-to-pin and BOM compatible with the LTM4644, it offers a straightforward upgrade path, enabling designers to optimize costs and shorten product development cycles.

Sajet Step-Down Power IC

  • Quad Output Step-Down Power ModuleRegulator with 4A per Output
  • >W ide Input Voltage Range: 4V to 14V
  • 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
  • Internal Temperature Monitor
  • Soft-Start/Voltage Tracking
  • Output Overvoltage, Overcurrent andOvertemperature Protection
  • 9mm × 15mm × 5.01mm BGAPackages

RE4644 Ultrathin Quad 4A Configurable DC/DC Step-Down Power Module

The RE4644 is an integrated four-channel DC/DC step-down power regulator featuring configurable 4A single-channel output, and its multiple channels can be paralleled to reach a peak total output current of 16A. The compact package integrates switching controllers, power FETs, inductors and all matching auxiliary components. It runs on a 4V–14V input voltage range, with each channel offering adjustable 0.6V–5.5V output voltage configured via a single external resistor; its high-efficiency design supplies 4A continuous current per rail, requiring only a minimal number of input and output capacitors for peripheral layout. Utilizing high switching frequency and current-mode control architecture, the module achieves ultra-fast transient response to input line and load fluctuations while retaining stable system operation, and comes with built-in overvoltage and overcurrent protection to prevent circuit breakdown. The RE4644 features complete pin-to-pin and BOM-to-BOM compatibility with LTM4644 for seamless direct replacement and convenient product iteration.

Application Schematic

RE4644 is a quad-channel 4A step-down module with 4V~14V input voltage, and the parallel of four channels can reach 16A maximum output current. The peripheral circuit structure is consistent with RE4643: four groups of independent VIN/SVIN/RUN pins control each channel separately, with dual 22μF input capacitors for input filtering. Four FB pins are configured with different resistance values to set 1.5V, 1.2V, 1V, 0.9V independent outputs, each output terminal equipped with 47μF filter capacitor. CLKIN/CLKOUT realize inter-module frequency synchronization, TEMP pin monitors operating temperature, and standard SGND/GND grounding layout enhances system stability. Higher single-channel 4A current capability makes it ideal for high-density communication equipment and multi-core processor power supply.

APPLICATION

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

BGA PACKAGE-TOP VIEW

Standard Four-channel Array BGA Layout
Standardized 4-channel BGA pin assignment, L-A rows × 1-7 columns layout, each channel maintains fully independent power and signal pins, shared clock and temperature detection pins are centrally placed. Independent grounding area for every channel effectively eliminates cross-channel interference, standardized pin definition greatly shortens PCB design cycle, widely applicable for mainstream multi-channel industrial power supply, network switch and computing hardware power architecture development.

Fields of Application

  • FPGAs, DSPs and ASICs Applications:
    Powers high-performance Xilinx Ultrascale+ and Intel Stratix FPGAs. The quad 4A outputs handle VCCINT, VCCDSP, and high-current I/O banks, while configurable parallel operation scales to 16A for large FPGAs. Differential sensing maintains ±1.5% accuracy for sub-1V core rails, and fast transient response prevents voltage droop during FPGA reconfiguration or high-speed transceiver activity.
  • Telecom and Networking Equipment:
    Designed for 5G massive MIMO radio units and optical transport platforms. The 4V–14V input aligns with 12V PoE and telecom DC distribution, maximizing efficiency. Quad outputs power RF transceivers, JESD204B ADCs/DACs, and clock generators, with frequency synchronization preventing beat frequencies in sensitive receiver chains. Low EMI ensures compliance with FCC/CE regulations for wireless infrastructure.
  • Industrial Equipment:
    Powers industrial Ethernet switches and time-sensitive networking (TSN) devices. The quad rails isolate power for PHYs, switch ASICs, and real-time MCUs, preventing noise coupling. Wide input range tolerates noisy 12V/24V industrial buses, while robust protection safeguards against short circuits in field wiring. Compact size fits in DIN-rail mountable modules for factory automation.
  • Data Center Accelerators:
    Powers SmartNICs and FPGA-based acceleration cards. The high current per channel supports PCIe Gen4/5 endpoints and DDR4/5 memory interfaces, maintaining signal integrity at 32GT/s. Multiphase operation reduces input ripple, critical for clean power in high-speed serial links. Pin-to-pin compatibility with LTM4644 allows easy upgrades for next-gen accelerator designs.
  • Broadcast and Pro AV:
    Powers 8K video processors and live production switchers. The quad outputs generate clean rails for HDMI 2.1 transmitters, SDI deserializers, and frame synchronizers, minimizing jitter. Low noise prevents visual artifacts in high-dynamic-range (HDR) video processing, and high reliability ensures uninterrupted operation in live broadcast environments where downtime is costly.

Core product advantages

Thermal-enhanced Universal Quad-channel Integrated Module

RE4644 adopts 9mm×15mm×5.01mm thickened heat-optimized BGA package, integrating four independent 4A power channels with maximum 16A combined parallel current. Compared with RE4643, it upgrades single-channel current and output voltage range, high integration replaces multiple discrete power supplies, the optimized thermal structure adapts dense layout of industrial control cabinets, network switches and sensor mixed-signal boards, balancing board occupation and heat dissipation performance perfectly.

Wide Voltage Output & Rapid Anti-interference Regulation

It supports 4V~14V input and 0.6V~5.5V wide-range adjustable output, perfectly driving DSP, mixed-signal circuits and various sensor interfaces. Fast transient response effectively suppresses voltage fluctuation brought by frequent load switching, strong anti-interference design adapts complex electromagnetic environment of industrial sites. Independent channel stable output ensures each sensor and control unit works synchronously, widely applicable to edge computing gateways and enterprise network equipment.

LTM4644 Drop-in Alternative to Reduce Product Iteration Cost

RE4644 is fully pin-to-pin and BOM compatible with LTM4644, realizing seamless replacement of original imported power chips without PCB redesign and secondary verification. Universal multi-channel design unifies power supply scheme of multiple product lines, reducing mold opening and design costs. Stable batch consistency improves production yield, shortened material delivery cycle brings obvious cost reduction advantages for mass-produced industrial and network equipment.

Comprehensive Protection & Mature General Configuration

Built-in integrated overvoltage, overcurrent, overtemperature multi-protection system effectively resist industrial grid surge and load short-circuit impact. Voltage adjustment structure is mature and universal, parameter debugging is simple and fast, suitable for small-batch prototype trial production and personalized customized equipment. Reserved synchronous and power-good pins facilitate system centralized monitoring, low peripheral design difficulty reduces after-sales maintenance cost, bringing long-term reliable intelligent safety guarantee for general industrial electronic equipment.

High-Density Quad Power, Perfectly Engineered

Discover the pinnacle of high-density power conversion with Sajet’s RE4644 quad-channel DC/DC step-down module. Built with four independent power channels, the device supports four 4A continuous outputs, paired with precise resistor voltage setting to deliver steady 0.6V–5.5V adjustable outputs and stable power supply for 5G mmWave radios, industrial PC motherboards, and automotive infotainment SoCs. 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 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 LTM4644 for direct replacement without board redesign, alongside multi-functional expansion including frequency synchronization, multiphase parallel connection, and voltage tracking. From advanced wireless infrastructure and industrial computing to next-generation automotive electronics, trust Sajet’s RE4644 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 purchased 5,500 pieces of Sajet RE4644 quad DC/DC modules for multi-sensor industrial gateway mainboards. Four independent 4A per-output channels cover diverse DSP, memory and communication chip power demands, with wide 0.6V–5.5V adjustable voltage range. The 9mm×15mm×5.01mm integrated BGA packs controllers, MOSFETs and inductors into one compact device, saving massive PCB real estate on dense multi-sensor boards. Drop-in compatible with LTM4644, we skipped costly PCB redesign during product generation upgrades, and comprehensive multi-channel fault protection reduces field equipment downtime.

  • We deployed RE4644 after full environmental reliability testing for compact tactical signal analyzers. Each quad channel delivers tight ±1.5% DC output accuracy regardless of input line fluctuation or rapid sensor load shifts. Multiphase parallel current sharing lets us combine channels to reach up to 16A total output for high-power signal processing ASICs. Wide -55℃ to 125℃ temperature rating withstands harsh field deployment climates, and batch consistency meets military electronic component screening criteria, lowering our reliance on expensive US-sourced quad power modules.

  • We upgraded multi-channel servo sensor power supplies on production machines with RE4644 modules. Adjustable switching frequency and external clock synchronization suppress EMI interference near sensitive analog position sensors. Independent soft-start and voltage tracking per channel enable orderly multi-rail power-up for complex control logic. Continuous factory operation over 8 months recorded zero power module failures, delivering around 28% total power component cost savings, and we will expand procurement to all new machine models next year.

  • We sourced RE4644 small sample batches for high-performance 4K smart camera R&D. High integration cuts the number of surrounding capacitors and resistors required, accelerating prototype assembly and debug cycles. Separate OVP/OCP protection for every channel prevents single sensor power fault from disrupting the entire camera system. Long-duration thermal cycling testing maintained consistent output performance, and we will place mass production orders once our camera design is finalized.

Alternative Names

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