EVB_RT7251AZQW

RT7251AZQW Evaluation Board Purpose The RT7251A is a high-efficiency current mode synchronous step-down regulator that can deliver up to 1.5A output current from a wide input voltage range of 4V to 17V. This document explains the function and use of the RT7251A evaluation board (EVB) and provides information to enable operation and modification of the evaluation board and circuit to suit individual requirements. Table of Contents Purpose .......................................................................................................................................................... 1 Introduction ..................................................................................................................................................... 2 General Product Information ...................................................................................................................... 2 Key Performance Summary Table ............................................................................................................. 3 Bench Test Setup Conditions ......................................................................................................................... 4 Headers Description and Placement .......................................................................................................... 4 Test Points .................................................................................................................................................. 4 Power-up & Measurement Procedure ........................................................................................................ 5 Output Voltage Setting ............................................................................................................................... 5 Schematic, Bill of Materials and Board Layout ............................................................................................... 6 EVB Schematic Diagram ............................................................................................................................ 6 Bill of Materials ........................................................................................................................................... 7 EVB Layout ................................................................................................................................................. 8 More Information........................................................................................................................................... 12 Important Notice for Richtek Evaluation Board ............................................................................................ 12 UG7251AZQW-00 March 2014 www.richtek.com RT7251AZQW Evaluation Board Introduction General Product Information General Description The RT7251A is a high efficiency, monolithic synchronous step-down DC/DC converter that operates at 340kHz and delivers up to 1.5A output current from a 4V to 17V input supply. The RT7251A’s current mode architecture allows the transient response to be optimized. Cycle-by-cycle current limit provides protection against shorted outputs and soft-start eliminates input current surge during start-up. Fault conditions also include output under voltage protection, output over voltage protection, and thermal shutdown. The low current (2.5V) to enable operation or low (