The RT7298AHGQW 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 RT7298AHGQW 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.
Key Performance Summary Table
•Low RDS(ON) Power MOSFET Switches 26mΩ/19mΩ
•Input Voltage Range : 4.5V to 18V
•Adjustable Switching Frequency : 200kHz to 1.6MHz
•Synchronous to External Clock : 200kHz to 1.6MHz
•Accurate Voltage Reference 0.6V±1%
•Monotonic Start-Up into Pre-biased Outputs
•Power Good Indicator
•Selectable Hiccup Mode and Latch-Off Mode Under-Voltage Protection
•Over-Temperature and Over-Voltage Protection
•Input Under-Voltage Lockout
Headers Description and Placement
Please carefully inspect the EVB IC and external components, comparing them to the following Bill of Materials, to ensure that all components are installed and undamaged. If any components are missing or damaged during transportation, please contact the distributor or send e-mail to firstname.lastname@example.org.
The EVB is provided with the test points and pin names listed in the table below.
Power-up & Measurement Procedure
1. Apply a 12V nominal input power supply (4.5V < VIN < 18V) to the VIN and GND terminals.
2. Set the jumper at J9 to connect terminals 1 and 2, connecting EN to VIN through resistor REN1, to enable operation.
3. Verify the output voltage (approximately 3.3V) between VOUT and GND.
4. Connect an external load up to 6A to the VOUT and GND terminals and verify the output voltage and current.
Output Voltage Setting
Set the output voltage with the resistive divider (R1, R2) between VOUT and GND with the midpoint connected to FB. The output is set by the following formula :
EVB Schematic Diagram
Bill of Materials
Top View (1st layer)
PCB Layout—Inner Side (2nd Layer)
PCB Layout—Inner Side (3rd Layer)
Bottom View (4th Layer)