features extremely low thermal impedance, allowing very ef cient and quick heat removal from the substrate and top of the package to the ambient. This is especially important in densely populated circuit boards, offering a simple solution for powering both core and I/O supplies for FPGAs and ASICs.A high switching frequency, current mode architecture enables a very fast transient response to line and load changes without sacri cing stability. Ef ciency is typically up to 95%. The two regulators on each device operate from separate input voltages, ranging from 2.375V to 5.5V, and the output voltages are set by a single resistor for each output. Outputs may be paralleled for higher current. Fault protection features include overvoltage protection, overcurrent (short circuit) protection, thermal shutdown and soft-start.The LTM4616 is a dual multiphase switch mode DC/DC power regulator system that can regulate either two voltages ranging from 0.6V to 5V at up to 8A each, or one output volt LINEAR TECHNOLOGY CHRONICLE8The LTM8040 is a xed Design Note