DC2172A

DC2172A is a demonstration circuit featuring the LTC7138. This LTC7138 is a high input voltage, 400mA step-down regulator. The output of the regulator can be programmed for either 5V, 3.3V or 1.8V with on-board jumpers or is adjustable from 800mV to VIN using an optional feed back divider. The input voltage range is from 4V to 140V. The LTC7138’s Burst Mode® operation, low quiescent current and internal top FET switch provide high efficiency over a wide range of loads. Other features include: optional components to adjust the current limit, make it proportional to VIN or improve the efficiency and reduce the output voltage ripple. FBO turret to tie two or more LTC7138 regulators together if the application requires more load current. Optional UVLO and OVLO divider and external/internal soft-start.

• 82.3% typical efficiency at VIN = 12V, VOUT = 5V, IOUT = 400mA
• 87mVP-P typical output ripple at VIN = 12V, VOUT = 5V, IOUT = 400mA