1 AN-1456 LM2717-ADJ Evaluation Board

The LM2717-ADJ is composed of two high current pulse width modulation (PWM) DC/DC buck converters. The first buck (step-down) converter provides an adjustable output at up to 1.5 A while the second buck converter provides an adjustable output at up to 2.5 A. The LM2717-ADJ evaluation board is designed for 1.8-V output at up to 1.5 A and 3.3-V output up to 2.4 A with an input voltage range of 5 V to 15 V. The board is ideally set up for converting a standard 12-V rail to 1.8 V and 3.3 V found in many applications. Either output can be changed to fit other applications as desired. If other output voltages are desired the output capacitors on the evaluation board are rated for 6.3 V so outputs up to 5 V can be used. For outputs greater than 5 V, the output capacitors need to be changed to capacitors with a higher voltage rating. Extra pads are provided for the output capacitors to accommodate a variety of output capacitance and output capacitor ESR requirements for any application. The schematic is shown in Figure 1-1 and the bill of materials (BOM) is discussed in Table 2-1.