ITE4644 Domestic replacement of LTM4644 power module

ITE4644 is a four channel DC/DC buck module regulator, each capable of outputting 4A. The output can be connected in parallel in an array, with a maximum capacity of 16A. encapsulation It contains switch controllers, power field-effect transistors, inductors, and supporting components. Working within the input voltage range of 4V~14V or 2.375V~14V (INTVCC/SVIN) External bias voltage). ITE4644 supports an output voltage range of 0.6V to 5.5V. Its high-efficiency design can provide 4A continuous (peak 5A) output current per channel. Only a large amount of input is needed And output capacitors. Additional features of ITE4644 include: power normal flag, input overvoltage protection, cycle by cycle current limit overheat shutdown, temperature detection, selectable under light load Intermittent mode and forced continuous mode are used to achieve better efficiency or good ripple.

Characteristic application scope Four output voltage reducing module regulator, with each output of 4A Input voltage range: 4V~14V Input voltage range: 2.375V~14V (INTVCC/SVIN external bias voltage) DC 4A, peak output current of each channel 5A Output voltage ranging from 0.6V to 5.5V Parallel higher output current ± 1.5% output voltage adjustment rate Current mode control, fast transient response Can output larger current in parallel Output voltage tracking Built in temperature sensing diode output Overvoltage, current, temperature protection Support external frequency synchronization

ITE4644 is an independent non isolated switch DC/DC power supply with four outputs. It has four independent regulator channels, each of which can provide up to A continuous output current of 4A, with only a small amount of external input and output capacitors required. The precise output voltage provided by each regulator can be adjusted at 0.6V through a single external resistor Programming is performed within the range of 5.5V, with an input voltage range of 4V to 14V. With the help of an external bias voltage, this module can operate at voltages as low as 2.375V Operate under the input voltage. ITE4644 integrates four independent fixed frequency COT valley current mode regulators, power metal oxide semiconductor field-effect transistors (MOSFETs), inductors, and Other supporting discrete components. The typical switching frequency is set to 1MHz. For applications sensitive to switch noise, the module can synchronize externally to 700kHz Clock up to 1.3MHz. With current mode control and internal feedback loop compensation, the ITE4644 module has the advantages of using various output capacitors (even all ceramic output capacitors) Adequate stability margin and good transient performance. Current mode control gives flexibility to parallel any individual regulator channel and enables precise current balancing. Due to the presence between every two regulator channels With the phase interleaving function, ITE4644 can easily adopt 2+2, 3+1, or 4-channel parallel operation, which is suitable for multi track POL applications such as field programmable gate arrays (FPGAs) It has extremely high flexibility in applications. In addition, ITE4644 is equipped with CLKIN and CLKOUT pins for frequency synchronization or multi-phase operation of multiple devices, allowing for up to Eight phases are cascaded and run simultaneously. Current mode control also provides fast current monitoring on a cycle by cycle basis. In overcurrent conditions, the module will reduce its operating frequency, causing the inductor current to be clamped at the current limiting point. The internal overvoltage and undervoltage comparator will pull the open drain PGOOD output low when the output feedback voltage exceeds the window of+10% of the tuning node. Continuous Conduction Mode (CCM) Under overvoltage (OV) and undervoltage (UV) conditions, the nuclear module will be forcibly shut down, except during startup when the SS pin rises to 0.6V. Pull the RUN pin A voltage below 1.1V will force the controller to enter a shutdown state, while shutting down two power MOSFETs and most of the internal control circuits. Under light load current, by Setting the MODE pin to SGND enables discontinuous conduction mode (DCM) operation, which can achieve higher efficiency compared to continuous conduction mode (CCM). module The block contains a temperature diode inside to monitor the temperature of the module.

In high-density and high reliability application scenarios such as communication base stations, industrial control, FPGA/ASIC power supply, multi-channel communication The high-efficiency DC/DC power module is the core of the system. Traditional solutions often rely on power supply models from international giants Now, a domestically produced product with excellent performance and complete testing, ITE4644, has made a brilliant debut Engineers have provided reliable domestic alternatives as a new option.

In the fields of industrial automation, communication equipment, medical instruments, and high-end testing and measurement, the power module serves as the "heart" of the system, and its stability and reliability directly determine the performance limit of the entire equipment. For a long time, the high-end power module market has been dominated by international brands, but with the rapid development of domestic semiconductor and power electronics technology, domestically produced products represented by "4644 power modules" are gradually breaking this pattern. The 4644 power module typically refers to a DC-DC conversion module with high power density, wide input voltage range, and multiple isolated outputs, named after its specific packaging size or power level. This article will deeply analyze the technical characteristics, application advantages, selection points, and future trends of the domestically produced 4644 power module, helping engineers and procurement personnel to comprehensively understand this key component.

1、 Breakthrough in core technology of domestic 4644 power module

The reason why the domestically produced 4644 power module can stand out in the fierce market competition is that it has achieved breakthroughs in multiple technical dimensions. Firstly, in terms of power density, by adopting advanced planar transformers and multi-layer PCB layout technology, domestic modules have successfully increased the power density to over 100 watts per cubic inch, and some high-end models can even reach 150 watts, which is on par with international first-line brands. For example, the 4644 series module launched by a leading domestic manufacturer achieved a continuous output power of 600W in a standard 1/4 brick package (2.28 "x 1.45"), with an efficiency of up to 96%, thanks to the use of GaN (gallium nitride) power devices and digital control algorithms.

Secondly, in terms of electromagnetic compatibility (EMC) design, domestic modules have introduced a new common mode noise suppression architecture. Traditional modules often generate serious electromagnetic interference due to high-frequency switching actions, while the domestically produced 4644 module optimizes the combination of built-in X capacitors, Y capacitors, and common mode chokes, combined with active EMI filtering technology, making it easy to pass the EN55022 Class B standard for both conducted and radiated disturbances. This means that in precision instruments or medical equipment, modules do not require additional external filters, saving valuable PCB space and BOM costs.

In addition, the innovation of thermal management technology is another major highlight. The domestically produced 4644 power module widely adopts an integrated design of bottom heat sink and thermal insulation material, combined with a finite element simulation optimized air duct structure, which enables the module to maintain a junction temperature below 85 ℃ under natural convection conditions, significantly extending the service life of electrolytic capacitors and power MOSFETs. A third-party test report shows that under the conditions of 55 ℃ ambient temperature and full load output, the MTBF (mean time between failures) of the domestically produced 4644 module has exceeded 2 million hours, fully meeting the requirements of industrial applications.

2、 Typical application scenarios of domestic 4644 power module

With its excellent performance and high cost-effectiveness, the domestically produced 4644 power module has penetrated into many key industries. In the field of 5G communication base stations, due to the fact that base station equipment is usually deployed outdoors and faces harsh temperature ranges (-40 ℃ to+85 ℃) and unstable power grid environments, the domestically produced 4644 module has become an ideal power supply solution for RF amplifiers and baseband processing units due to its wide input voltage range (36V to 75V, compatible with 48V standard) and comprehensive overvoltage and overcurrent protection functions. According to industry data statistics, the penetration rate of domestically produced 4644 modules in 5G base stations has exceeded 40% in 2023, nearly three times higher than in 2020.

In the field of industrial automation and intelligent manufacturing, PLCs (programmable logic controllers), servo drives, and industrial robots have extremely high requirements for ripple noise in power supplies. The domestically produced 4644 module uses a multi-phase Buck topology and low ESR capacitors to control the output ripple within 20mV, far below the industry standard of 50mV. For example, on a fully automatic automotive welding production line, a servo system powered by the domestically produced 4644 module improved positioning accuracy by 0.02mm and reduced failure rate by 15%. At the same time, the isolation voltage of the module is as high as 3000VDC, effectively preventing surge impact on the control circuit caused by the start stop of the high-voltage motor.

In medical electronic devices such as CT machines, ultrasound diagnostic equipment, and patient monitors, the reliability of the power module is directly related to patient safety. The domestically produced 4644 module has passed strict IEC 60601-1 medical safety certification and has ultra-low leakage current（<100 μ a) and 2mopp (dual patient protection) levels. A well-known domestic medical device manufacturer has reported that after replacing with a domestically produced 4644 module, the power failure rate of their monitor has decreased from 0.8% to 0.2%, while the procurement cost has been reduced by 30%, achieving a win-win situation between performance and cost.<>

3、 Key considerations for selecting domestic 4644 power modules

Although domestically produced 4644 power modules have significant advantages, engineers still need to conduct comprehensive evaluations from multiple dimensions when selecting them in practice. Firstly, it is the matching of input and output parameters. The 4644 module typically supports multiple input voltage ranges, such as 24V, 48V, or 110V, and the output may be single (such as 12V/50A) or multiple (such as 5V/10A+3.3V/10A). The constant voltage or constant current output mode should be selected according to the load characteristics, and at least 20% power margin should be reserved to cope with transient load changes. For example, if the peak current of the load is 40A, a module with a rated output current of 50A or higher should be selected.

Next is environmental adaptability assessment. The derating curve of the module is crucial in high temperature, high humidity, or high-altitude scenarios. The manual for domestically produced 4644 modules usually provides output power derating data at different ambient temperatures. For example, at an ambient temperature of 85 ℃, the module may need to be downgraded to 60% of its rated power. Engineers need to combine the simulation results of the internal temperature rise of the equipment to ensure that the module can still work stably under the worst-case conditions. In addition, for vibration and impact environments, modules using encapsulation technology should be given priority, as their anti vibration performance can be improved by more than 5 times.

Finally, there is supply chain and technical support. Compared to imported brands with a delivery cycle of 12-16 weeks, the supply cycle of domestically produced 4644 modules can be shortened to 4-6 weeks, and manufacturers usually provide free samples and on-site FAE support. It is recommended to prioritize manufacturers who have obtained quality system certifications such as ISO 9001 and IATF 16949 when selecting, and to request third-party reliability testing reports for modules, including high-temperature aging, temperature cycling, and salt spray testing data. For example, the 4644 module from a leading domestic manufacturer passed a 1000 hour wet heat aging test at 85 ℃/85% RH, with an output accuracy drift of less than 1%.

4、 Common faults and countermeasures of domestic 4644 power module

Although the reliability of domestically produced 4644 modules has greatly improved, some typical problems may still be encountered in practical applications. The most common is startup abnormality, manifested as the module having no output or a slow increase in output voltage after the input is powered on. This is usually caused by excessive input capacitance or excessive load capacitance. The solution is to check the recommended starting capacitance value of the module and connect a 10 μ F to 100 μ F electrolytic capacitor in parallel at the input end to absorb the starting surge. If the load capacitance exceeds the module specifications, soft start circuits or external current limiting resistors can be considered.

Excessive output ripple is another high-frequency fault. When high-frequency spike noise appears at the output of the module, the first thing to check is whether the PCB layout is reasonable, such as whether the output circuit forms an excessive loop area or is adjacent to the high-frequency switch node. It is recommended to parallel a 0.1 μ F ceramic capacitor and a 10 μ F tantalum capacitor near the module output, and use star grounding or large-area copper plating to reduce ground impedance. If the problem persists, you can try adding a first stage LC filter outside the module, such as using a combination of 2.2 μ H inductor and 47 μ F capacitor, which can suppress ripple to below 10mV.

Overheating protection triggering also occurs from time to time. When the temperature of the module exceeds its protection threshold (usually 105 ℃ -110 ℃), the module will automatically shut down the output. At this point, the heat dissipation conditions should be checked: has thermal grease been applied to the bottom of the module? Is the radiator tightly attached to the module? Is the air duct blocked? For high-power density applications, it is recommended to use forced air cooling with a wind speed of no less than 1.5m/s. If space is limited, modules with heat dissipation substrates can be selected, and heat is conducted to the chassis through heat pipes.

5、 Future Development Trends of Domestic 4644 Power Modules

Looking ahead to the future, domestic 4644 power modules will evolve towards greater efficiency, intelligence, and miniaturization. In terms of efficiency, with the further decrease in the cost of SiC (silicon carbide) and GaN devices, it is expected that by 2025, the efficiency of mainstream domestically produced 4644 modules will exceed 98%, thereby reducing system power consumption by more than 30%. In terms of intelligence, modules that integrate PMBus or I ² C communication interfaces will quickly become popular. Users can monitor the input voltage, output current, temperature, and fault status of the module in real time through the upper computer, and achieve remote shutdown and output voltage fine-tuning. For example, a domestic manufacturer has launched a 4644 module that supports digital power management. Its output voltage can be adjusted in 10mV steps within the range of 0.6V to 5.5V, greatly facilitating the power supply design of FPGA and SoC.

In terms of miniaturization, 3D packaging and system in package (SiP) technology will drive the evolution of 4644 modules towards smaller sizes. It is expected that within the next two years, 1/8 brick or smaller package size will achieve the current power level of 1/4 brick, thus providing a more compact power supply solution for portable devices and edge computing nodes. At the same time, the reliability of domestically produced modules will be further improved. By introducing self-healing capacitors and redundant topologies, the modules can maintain output even after a single point of failure, and MTBF is expected to exceed 5 million hours.

In addition, the localization replacement process of domestically produced 4644 power modules will accelerate. In fields such as aerospace, military, and nuclear power that require high levels of autonomy and controllability, domestically produced modules have begun to replace imported products. For example, a domestically produced 4644 module has passed the GJB151B military EMC standard and 1000 hour accelerated life test, and is used as a power supply unit for a new radar system. With the maturity of the domestic semiconductor industry chain, it is expected that by 2026, the market share of domestically produced 4644 modules in the high-end market will increase from the current 30% to over 60%.

Conclusion

The domestically produced 4644 power module has grown from an initial "alternative" to a core component with international competitiveness. Its technological breakthroughs in power density, EMC performance, thermal management, and reliability have made it shine in fields such as 5G communication, industrial automation, and medical electronics. For engineers, when selecting, it is necessary to comprehensively consider input and output parameters, environmental adaptability, and supply chain support, and master common fault response strategies. Looking ahead to the future, with the deep integration of wide bandgap semiconductors and digital power technology, the domestically produced 4644 power module will not only promote the independent controllability of domestic equipment, but also lead the global power module towards high efficiency, intelligence, and miniaturization. As a system designer, embracing the domestically produced 4644 module means embracing a more efficient, reliable, and cost-effective future.