LTM4703

• Parallel for High-Power Applications
• External or Internal Compensation
• With Optional Input EMI Filter

The EVAL-LTM4703-AZ evaluation board is a step-down dc-to-dc switching converter featuring the LTM^®4703 μModule^® (micromodule) regulator. The EVAL-LTM4703-AZ is designed to deliver 12A maximum output current from a 4V to 16V input. The LTM4703 employs Silent Switcher^® architecture with internal hot loop bypass capacitors to achieve both low electromagnetic interference (EMI) and high efficiency. The LTM4703 contains a current mode regulator IC, a power inductor, and a modest amount of input and output capacitance. A single resistor (R3) sets the output voltage, providing unity gain operation over the output range, resulting in virtually constant output noise independent of output voltage.

The EVAL-LTM4703-AZ evaluation board's default switching frequency is 400kHz. An external resistor is placed from the RT pin to GND (R7) to set the switching frequency.

The SYNC pin programs three different operating modes (JP1 jumper): select PULSE for pulse-skipping mode with improved efficiency at light loads; select FCM for forced continuous mode operation where fixed frequency operation is more critical than low current efficiency, and where the lowest output ripple is desired; select SYNC to synchronize to an external clock signal. The RUN terminal can be used to set the LTM4703 in shutdown mode. The power good output (PG) will be low when the output voltage exceeds the ±7.5% regulation window. When the power good feature is used, set the PGSET resistor (R1) value according to the regulator output voltage.

The LTM4703 data sheet provides a complete description of the operation and application information. The data sheet must be read in conjunction with this user guide.