EVB_RT7298BLGQW

RT7298BLGQW your power partner. Evaluation Board RT7298BLGQW Evaluation Board Purpose The RT7298BL is a synchronous step-down converter with current mode control, which can deliver up to 6A output current from a wide input voltage range of 4.5V to 18V. This document explains the function and use of the RT7298BL 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 KEY PERFORMANCE SUMMARY TABLE ................................................................................................................................... 2 BENCH TEST SETUP CONDITIONS............................................................................................................................................ 3 SCHEMATIC, BILL OF MATERIALS AND BOARD LAYOUT ........................................................................................................... 5 MORE INFORMATION........................................................................................................................................................... 10 IMPORTANT NOTICE FOR RICHTEK REFERENCE DESIGNS ...................................................................................................... 10 UG7298BLGQW-00 January 2015 1 RT7298BLGQW your power partner. Evaluation Board Introduction General Product Information The RT7298BL is a high efficiency, monolithic synchronous step-down DC/DC converter that can deliver up to 6A output current from a 4.5V to 18V input supply. The RT7298BL current-mode architecture with external compensation allows 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 startup. Fault condition protections include output under-voltage protection, output over-voltage protection, and over temperature protection. The low current shutdown mode provides output disconnection, enabling easy power management in battery-powered systems. The RT7298BL is available in WQFN-14AL 3.5x3.5 package. Product Feature Low R Power MOSFET Switches 26m/19m DS(ON) Input Voltage Range : 4.5V to 18V Adjustable Switching Frequency : 200kHz to 1.6MHz Current-Mode Control Synchronous to External Clock : 200kHz to 1.6MHz Accurate Voltage Reference 0.6V 1.25% Monotonic Start-Up into Pre-biased Outputs Adjustable Soft-Start Power Good Indicator Under-Voltage and Over-Voltage Protection Input Under-Voltage Lockout RoHS Compliant and Halogen Free Key Performance Summary Table Key Features Evaluation Board Number: PCB006 V1 Default Input Voltage 12V Max Output Current 6A Default Output Voltage 1.0V Default Marking & Package Type RT7298BLGQW, WQFN-14AL 3.5x3.5 Operation Frequency Steady 500kHz at all loads Other Key Features 4.5V to 18V Input Voltage Range Programmable Soft-Start, Adjustable Switching Frequency Synchronous to External Clock Power Good Indicator Protection Output Under-Voltage Protection (Latch-Off mode) Output Over-Voltage Protection Cycle-by-cycle Current Limit Thermal Shutdown UG7298BLGQW-00 January 2015 2