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User's Guide
SNVA368D–September 2008–Revised April 2013
AN-1895 LM22671 Evaluation Board
1 Introduction
The LM22671 evaluation board is designed to demonstrate the capabilities of the LM22671 switching
regulator. The LM22671 evaluation board schematic shown in Figure 1 is configured to provide an output
voltage of 3.3V up to 500 mA load current with an input voltage range of 4.5V to 42V. The typical
operating frequency is 500 kHz. The evaluation board is designed to operate at ambient temperatures up
to 50°C.
The performance of the evaluation board is as follows:
• Input Range: 4.5V to 42V
• Output Voltage: 3.3V
• Output Current Range: 0A to 500 mA
• Frequency of Operation: 500 kHz
• Board Size: 1.5 × 1.5 inches
• Package: PSOP-8
At low input voltages between 4.5V and 6V, a minimum load of approximately 5 mA may be required to
reach a regulated 3.3V output voltage. For more details, see LM22671/LM22671Q 42V, 500mA SIMPLE
SWITCHER Step-Down Voltage Regulator with Features (SNVS589).
To aid in the design and evaluation of DC/DC buck converter solutions based on the LM22671 switching
regulator, the evaluation board can be re-configured for different output voltages.
Typical evaluation board performance and characteristics curves are shown in Section 8. The PCB layout
is shown in Section 9
Test points are provided to enable easy connection and monitoring of critical signals. When performing
over load or short circuit tests, refer to the current limit section of the LM22671 datasheet (SNVS589) to
determine if the circuit is in safe operating mode.
For more information about device function and electrical characteristics, refer to the LM22671 datasheet
(SNVS589).
WEBENCH is a registered trademark of Texas Instruments.
All other trademarks are the property of their respective owners.
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SNVA368D–September 2008–Revised April 2013 AN-1895 LM22671 Evaluation Board
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