EVB_RT7297AHZSP Richtek

RT7297AHZSP Evaluation Board Purpose The RT7297A is a high-efficiency current mode synchronous step-down regulator that can deliver up to 3A output current from a wide input voltage range of 4.5V to 18V. This document explains the function and use of the RT7297A 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 Other Technical Information ......................................................................................................... 10 UG7297AHZSP-00 July 2014 www.richtek.com RT7297AHZSP Evaluation Board Introduction General Product Information General Description The RT7297A is a high efficiency, monolithic synchronous step-down DC/DC converter that can deliver up to 3A output current from a 4.5V to 18V input supply. The RT7297A s current mode architecture and external compensation allow the transient response to be optimized over a wide range of loads and output capacitors. Cycle-by-cycle current limit provides protection against shorted outputs and soft-start eliminates input current surge during start-up. The RT7297A also provides output under voltage protection and thermal shutdown protection. The low current (<3A) shutdown mode provides output disconnection, enabling easy power management in battery-powered systems. The RT7297A is available in an SOP-8 (Exposed Pad) package. Features 1.5% High Accuracy Feedback Voltage 4.5V to 18V Input Voltage Range 3A Output Current Integrated N-MOSFET Switches Current Mode Control Fixed Frequency Operation : 340kHz Output Adjustable from 0.8V to 15V Up to 95% Efficiency Programmable Soft-Start Stable with Low-ESR Ceramic Output Capacitors Cycle-by-Cycle Over Current Protection Input Under Voltage Lockout Output Under Voltage Protection Thermal Shutdown Protection UG7297AHZSP-00 July 2014 www.richtek.com 2