Regulator with exposed stack inductor package boosts thermal performance
The remaining components, the MOSFETs, DC/DC controller and supporting components, are over-moulded and the complete device is housed in a 11.25mm x 15mm x 5.74mm BGA package. With limited airflow, the LTM4662 is easily cooled because the inductor transfers heat from the power stage to the surrounding ambient air.
The LTM4662 performs at up to 96% peak efficiency, enabling it to deliver a full 30A continuously at 12V IN to 1.0V OUT at 70°C ambient with 200LFM airflow as a single output or dual 15A output. With the dual regulator design, small package size and precise voltage accuracy, the LTM4662 meets the PCB area constraints of densely populated system boards to power low voltage and high current devices such as FPGAs, ASICs, microprocessors and GPUs.
Suitable applications include PCIe boards, communication infrastructure, cloud computing-based systems, as well as medical, industrial, and test & measurement equipment.
The LTM4662 operates from a 4.5V to 20V input voltage range and with a 5V external bias, the device can operate from 2.375V for the latest low voltage devices. The output voltages are adjustable from 0.6V to 5.5V, enabling the device to generate not only low voltage for digital devices but also 2.5V, 3.3V and 5V which are commonly needed as system bus voltages. The total output voltage DC accuracy is guaranteed at ±1.5% over line, load and temperature (–40°C to 125°C).
Two LTM4662s can current share to deliver 60A to a load and onboard remote sense amplifiers on both outputs compensate for voltage drops caused by trace impedance of the PC board due to large load current. Selectable internal or external feedback loop compensation allows designers to optimise loop stability and transient performance while minimising the number of output capacitors.
The switching frequency can be programmed from 250kHz to 1MHz with one resistor and can be synchronized to an external clock ranging from 250kHz to 1MHz for noise-sensitive applications. Protection features include overvoltage and overcurrent protection and it operates from –40°C to 125°C. Pricing starts at $18.85 in 1000 quantities.
www.linear.com/product/LTM4662
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