DC1901A

DC1901A demonstration circuit is a 150V input, 100mA output DC/DC power supply featuring the LTC3639. The IC operates in a high efficiency Burst Mode® operation and includes internal high and low side power MOSFETs. The board will accept an input voltage between 4V and 150V, and provide jumper selected output voltages of 1.8V, 3.3V, 5V and an option for additional voltages. The IC includes internal soft-start and a provision for increasing soft-start time. Included on the board is an ON/OFF jumper that can also be configured as a precision undervoltage lockout. Additional PC pads are included for programming current limit to optimize efficiency and for reducing output voltage ripple and reducing component size. A terminal (FBO) is included to allow multiple boards to be paralleled for higher output current. Output voltage between 800mV and VIN can be programmed using optional resistors. (Higher voltage rating output capacitors may be required).

• 87.3% typical efficiency at VIN = 12V, VOUT = 5V, IOUT = 100mA
• 66mVP-P typical output ripple at VIN = 150V, VOUT = 5V, IOUT = 100mA (20MHz BW)