The MAXREFDES98# features 12 through-hole pins spaced at a 2.54mm pitch

standard. This modular architecture allows MAXREFDES98# to be soldered into a PCB

or inserted into the MAXREFDES98EV# for evaluation.

System Diagram

Figure 1. MAXREFDES98# reference design block diagram.

Detailed Circuit Description

The MAXREFDES98# reference design contains all the control circuitry and electric

components required for designing a 36V to 57V wide-input, 5V/2.5A (12.5W) output

non-isolated step down converter power supply.

On the board, there are two 6-pin connectors. Table 1 and Table 2 provide the function

of each pin.

Pin #

Name

Function

1

VA1

Rectifier A input terminal 1

2

VA2

Rectifier A input terminal 2

3

VB1

Rectifier B input terminal 1

4

VB2

Rectifier B input terminal 2

5

CP1

PD Classification resistor terminal 1

6

CP2

PD Classification resistor terminal 2

Pin #

Name

Function

1

5V output

2

5V output