DC3189A

DC3189A is a demonstration circuit 3189A featuring the LTM®4712, a high efficiency, buck-boost µModule® regulator with a 5V to 36V input voltage range and 1V to 36V output voltage range. The output is capable of 12A in buck and buck boost modes, and 6A under 12VIN and 24VOUT. Derating is necessary for certain VIN, VOUT, frequency and thermal conditions. The DC3189A demo board features a constant-current mode (CCM) to deliver a precise, regulated current while the load may vary. The DC3189A demo board is optimized using a default frequency of 400KHz. The current mode architecture used in the LTM4712 is peak-current mode control. The LTM4712 operates in continuous current mode by default but can be placed in pulse-skipping mode to optimize efficiency at light loads. The LTM4712 is offered in a 16mm x 16mm x 8.34mm ball grid array (BGA) package suitable for automated assembly by standard surface mount equipment.

• Input voltage range from 5 to 36V
• 12V typ output voltage at RFB = 9.09Kohm, TA = 25°C
• 400KHz switching frequency at RFREQ = 140Kohm, TA = 25°C
• 12A maximum output current at VIN = 10V to 36V, fSW = 400KHz, TA = 25°C
• 96.25% efficiency at VIN = 12V, IOUT = 12A, fSW = 400KHz
• 97.1% peak efficiency at VIN = 24V, IOUT = 7.2A, fSW = 400KHz
• LTM4712 has package feature inductor on top of moulded substrate to improved heat sinking capability

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