Improving heat dissipation performance by exposing the stacked inductor outside the BGA package

Analog Devices announced the release of new Power by Linear LTM4662 dual 15A or single 30A step-down µModule regulators that expose stacked inductors outside the BGA package to improve heat dissipation performance.

The remaining components, MOSFETs, DC/DC controllers, and support components are embedded within the package, and the entire device including all these components is provided in a BGA package measuring 11.25mm x 15mm x 5.74mm.

Even in environments with limited airflow, the LTM4662 can easily lower the temperature because it dissipates heat from the power stage into the surrounding air through the exposed inductor. The LTM4662 can achieve up to 96% efficiency and can continuously provide 30A at 12VIN / 1.0VOUT with an airflow of 200LFM up to an ambient temperature of 70°C.

Featuring a dual regulator design, small package size, and precise voltage regulation, the LTM4662 is ideal for powering low-voltage/high-current devices such as FPGAs, ASICs, microprocessors, and GPUs because it meets the PCB space constraints of densely packed system boards. The new product can be utilized in applications including PCIe boards, communication infrastructure, cloud computing-based systems, as well as medical, industrial, and instrumentation and measurement equipment.

The LTM4662 operates in an input voltage range of 4.5V to 20V. If a 5V external bias can be applied, operation is possible even with an input of 2.375V. The output voltage is adjustable between 0.6V and 5.5V, allowing for the generation of low voltages for digital devices as well as 2.5V, 3.3V, and 5V, which are widely required for system bus voltages. The total output voltage DC accuracy guarantees an error of ±1.5% across all line, load, and temperature conditions (–40°C to 125°C).

Two LTM4662s can share current, allowing them to provide 60A to the load. In addition, onboard remote sensing amplifiers supported on both output stages compensate for high load currents and voltage drops caused by the trace impedance of the PC board. The LTM4662 features selectable internal or external feedback loop compensation, enabling users to optimize loop stability and transient response performance while minimizing the number of output capacitors.

The switching frequency of the LTM4662 can be programmed between 250 kHz and 1 MHz using a single resistor, and can also be synchronized to an external clock between 250 kHz and 1 MHz for noise-sensitive applications. Overvoltage and overcurrent protection functions are provided.