STEVAL-ISA144V1

STEVAL-ISA144V1 1.5 A step-down switching regulator evaluation board based on the L5983 Data brief of covering the entire 2.9 V - 18 V input voltage range of the L5983 device. The board features an external resistor divider (R1 and R2) designed for an output voltage of 3.3 V. The output voltage can be set to a level from 0.6 V up to the rated voltage of the output capacitor (16 V). The compensation network on the evaluation board allows the use of MLCC as output filter to keep the loop stable. The inductor saturation current and forward current of the Schottky diode are within the current limit values. The switching frequency on the board is set to 500 kHz by means of the R5 resistor connected to pin Fsw. Features • 1.5 A DC output current • 2.9 V to 18 V input voltage • Output voltage adjustable from 0.6 V to 16 V • 250 kHz switching frequency, programmable up to 1 MHz • Internal soft-start and inhibit • Low dropout operation: 100% duty cycle • Zero-load current operation • Overcurrent and thermal protection • VFQFPN8 3 mm x 3 mm package • RoHS compliant Description The STEVAL-ISA144V1 product evaluation board provides the design engineer with a fully functional step-down switching regulator with an output current of up to 1.5 A. The L5983 integrates STMicroelectronics’ step-down switching regulator, together with all the external components required for a typical application. The rated voltage of the input capacitor and Schottky diode rectifier’s repetitive peak reverse voltage are both 25 V, making the board capable January 2014 DocID025361 Rev 1 For further information contact your local STMicroelectronics sales office. 1/4 www.st.com Schematic diagram 1 STEVAL-ISA144V1 Schematic diagram Figure 1. STEVAL-ISA144V1 circuit schematic VIN=3.3V t o 18V VCC INH GND GN C1 C1 C6 C6 10u F 68n F 8 1 3 2 L 598 L5 983 7 6 FSW FS R5 100K 4 OUT OU SYNCH 5 FB FB Vo u t =3 Vo =3.3V D1 D1 STPS2L 25U ST C2 C2 R1 4.99K 22u F C4 10n F CO COMP MP R4 2.49K R3 330 R2 1.1K C5 220p F 2/4 L 1 6.8u H DocID025361 Rev 1 C3 2.2n F STEVAL-ISA144V1 2 Revision history Revision history Table 1. Document revision history Date Revision 15-Jan-2014 1 Changes Initial release. DocID025361 Rev 1 3/4 4 STEVAL-ISA144V1 Please Read Carefully: Information in this document is provided solely in connection with ST products. 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