The DC3248A evaluation board circuit features the LTM®4659, 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 DC3248A evaluation board 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 2.6MHz. The Pulse width modulation (PWM) modes of operation are Forced continuous mode (FCM) for low noise or pulse-skipping mode (PSM) for high efficiency at light load. The LTM4659 defaults to FCM during synchronization and operates in PSM when both the FREQ and MODE/SYNC pins are connected to VIN.
The LTM4659 uses external compensation. Users can tune the compensation circuit to ensure the loop is stable and that the desired transient performance can be achieved.
For output loads that demand more than 10A of current, multiple LTM4659s can be paralleled to run out-of-phase to provide more output current without increasing input and output voltage ripples.
The LTM4659 data sheet must be read in conjunction with this evaluation board manual prior to working on or modifying the DC3248A evaluation board.
