Datasheet

User's Guide
SNVA357B–October 2008–Revised April 2013
AN-1878 LM5085 Evaluation Board
1 Introduction
The LM5085EVAL evaluation board provides the design engineer with a fully functional buck regulator,
employing the LM5085 PFET switching controller which uses the constant on-time (COT) operating
principle. This evaluation board provides a 5 V output over an input range of 5.5 V to 55 V. The circuit
delivers load currents to 4.5A, with current limit set at ≊7.6A. The board is populated with all components
except C5. Its use is described later in this document.
The board’s specification are:
• Input Voltage: 5.5 V to 55 V, 60 V maximum
• Output Voltage: 5 V
• Maximum load current: 4.5A for V
IN
>8 V
• Minimum load current: 0A
• Current Limit Threshold: ≊7.6A
• Measured Efficiency: 97.2% (V
IN
= 5.5 V, I
OUT
= 0.6Amps)
• Nominal Switching Frequency: 300 kHz
• Size: 3.1 in. x 1.5 in. x 0.78 in
Figure 1. Evaluation Board - Top Side
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SNVA357B–October 2008–Revised April 2013 AN-1878 LM5085 Evaluation Board
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