STEVAL-ISA090V1 STMicroelectronics

STEVAL-ISA090V1 3.5 A step-down switching regulator based on the L4973 Data brief Features Input voltage range: 8 V to 55 V Output voltage: 5.1 V 3% (line, load and thermal) Output ripple: 51 mV Output current range: 1 mA to 3.5 A Max output ripple current: 30% Current limit: 4.5 A Switching frequency: 150 kHz RoHS compliant STEVAL-ISA090V1 Description The STEVAL-ISA090V1 demonstration board provides a platform for evaluation of the L4973, a 3.5 A step-down monolithic power switching regulator operating in continuous mode. Based on the selection of the external components, the device can operate in the entire input voltage range of 8 V < V < 55 V. The IN output voltage is limited by the voltage rating of the output capacitor, so it can be adjusted within the 3.3 V < V < 30 V range through voltage OUT divider R , R . The input and output capacitors 3 4 are capable of sustaining the RMS current within the operating range. April 2011 Doc ID 018689 Rev 1 1/4 For further information contact your local STMicroelectronics sales office. www.st.com 4Schematic diagram STEVAL-ISA090V1 1 Schematic diagram Figure 1. STEVAL-ISA090V1 circuit schematic GAPMSMD00022 2/4 Doc ID 018689 Rev 1 signal GND signal GND GND plane