Introduction
The LTM4644 is a step-down voltage regulator micro-module with 4 outputs, each offering up to 4 Amperes of current limit. With a parallel output configurable array of loads, the total current that this regulator is able to provide is approximately 16 Amperes, making it a great choice for power electronics circuits, allowing it to handle multiple power rail systems.
Design of LTM4644 Regulator
The LTM4644 regulator comes with a 77-pin BGA design and has an input voltage range of 4 to 14 volts. The output of the LTM4644 is adjustable using external resistors and trimmers, generating a stable output voltage between 0.6 and 5.5 volts DC. However, for the LTM4644-1 version, the output is fixed at 1 volt.
● Temperature sensing
The voltage regulator features a dedicated temperature-sensing diode and has an output pin that can be used to sense the temperature of the module to keep it operating within a safe temperature range of between –40°C and 125°C. The maximum ambient temperature that this regulator can operate on without needing a heatsink is approximately 60°C.
● Efficiency
Studying the graph for the Input voltage ranging between 5 to 12 volts DC, we can see that the regulator has peak efficiency when drawing between 2 to 3 Amperes of current at the output, per channel. The efficiency remains stable but drops slightly when drawing up to 4 Amperes of current, which is the maximum current limit per channel. Efficiency ranges between 80 to 90% with higher output voltages being more efficient.
The DCM (Discontinuous Conduction Mode) is used for low load applications, typically for loads lower than 0.5 Amperes. The graph shows us that efficiency rises sharply with an increase in load current, exceeding the 80 to 90% efficiency range and making LTM4644 a viable option for low-power state processors and systems.
● Transient Responses
The Transient Response of this regulator suggests that this module can handle sudden load changes at the output more efficiently with a small voltage drop between ±25 to ±40 mA, with a recovery time between 20 to 30 ms.
Applications
● FPGA and ASIC Power Supplies
Since LTM4644 offers up to 4 output channels, it can help generate the standard output voltages of 3.3, 5, and 12 Volts needed to operate low-voltage electronic systems, especially digital systems such as FPGA boards and microcontroller units.
● Telecom and Networking Equipment
Telecommunication equipment requires high-efficiency circuits to ensure successful operation, and with LTM4644 offering an output efficiency between 80 to 90%, this module is perfect for offering multiple power rails.
● Industrial and Test Instrumentation
With its ability to adjust to noise-sensitive applications by externally synchronizing its clock from 700 kHz to 1.3 MHz, the LTM4644 can be integrated with an Industrial system to operate multiple sensors and control units, along with its safe protection feature, keeping industrial systems safe against damage.
Conclusion
With the LTM4644 Quad voltage regulator, you can power multiple circuits, taking advantage of its configurable output channels and efficient switching design. To learn about different types of regulators, check out this interesting piece on “AMS1117 vs LM7805 Voltage Regulators: Which One Should You Choose?” and to source an LTM4644 regulator for your own project, visit flywing-tech.com.
