Demonstration circuit 2861A features the LTM4658, a high efficiency, 10A step-down power μModule® regulator. The input voltage range is from 2.25V to 5.5V. The output voltage range is 0.5V to VIN. Derating may be necessary for certain VIN, VOUT, frequency and thermal conditions. The DC2861A offers the SSTT pin allowing the user to program output tracking, soft-start period and die temperature monitoring.
The MODE/SYNC pin either synchronizes the switching frequency to an external clock, is a clock output, or sets the PWM mode. It can be externally synchronized to a clock from 1MHz to 2.25MHz. The PWM modes of operation are forced continues mode for low noise or pulse-skipping (PS) mode for high efficiency at light load. The LTM4658 defaults to forced continues mode during synchronization. The LTM4658 operates in pulse-skipping mode when both the FREQ and MODE/SYNC pins are connected to VIN.
LTM4658 has internal compensation circuit which guarantees sufficient stability margins and good transient performance with a wide range of output capacitors, even with all ceramic output capacitors.
For output loads that demand more than 10A of current, multiple LTM4658s can be paralleled to run out of phase to provide more output current without increasing input and output voltage ripples.
The LTM4658 data sheet must be read in conjunction with the demo manual prior to working on or modifying demo circuit DC2861A.
