Texas Instruments AN-1650 LM34919 User Manual

1 Introduction
The LM34919EVAL evaluation board provides the design engineer with a fully functional buck regulator,
employing the constant on-time (COT) operating principle. This evaluation board provides a 5V output
over an input range of 8V to 40V. The circuit delivers load currents to 600 mA, with current limit set at a
nominal 700 mA. The board is populated with all components except R5, C9 and C10. These components
provide options for managing the output ripple as described later in this document.
The board's specification are:
• Input Voltage: 8V to 40V
• Output Voltage: 5V
• Maximum load current: 600 mA
• Minimum load current: 0A
• Current Limit: 640 mA to 730 mA
• Measured Efficiency: 92.7% (V
• Nominal Switching Frequency: 800 kHz
• Size: 2.6 in. x 1.6 in. x 0.5 in
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SNVA250A – June 2007 – Revised April 2013
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AN-1650 LM34919 Evaluation Board
= 8V, I = 300 mA)
IN OUT
Figure 1. Evaluation Board - Top Side
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User's Guide
SNVA250A – June 2007 – Revised April 2013
AN-1650 LM34919 Evaluation Board
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