EVB_RT7298BHGQW Richtek

RT7298BHGQW your power partner. Evaluation Board RT7298BHGQW Evaluation Board Purpose The RT7298BH 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 RT7298BH 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 UG7298BHGQW-00 January 2015 1 RT7298BHGQW your power partner. Evaluation Board Introduction General Product Information The RT7298BH 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 RT7298BH 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 RT7298BH 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 RT7298BHGQW, 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 (hiccup mode) Output Over-Voltage Protection Cycle-by-cycle Current Limit Thermal Shutdown UG7298BHGQW-00 January 2015 2