STEVAL-ISA144V1 STMicroelectronics

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 Features 500 kHz by means of the R5 resistor connected to 1.5 A DC output current pin Fsw. 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 rectifiers repetitive peak reverse voltage are both 25 V, making the board capable January 2014 DocID025361 Rev 1 1/4 For further information contact your local STMicroelectronics sales office. www.st.comSchematic diagram STEVAL-ISA144V1 1 Schematic diagram Figure 1. STEVAL-ISA144V1 circuit schematic V=II=I=NN=3 .33 VV to 18V LHLHLLH1111 6666....8888uuuuH VoVoVoVouuuutttt=3==3=33....3333VVVV VVCVCVCCCCCC OOUOUOUUTTTT 11111111 8888 D1D1DD11 SSCSCSCYYYYNNNNCHHHH IIHIHIHNNNNH 2222 3333 STSTSTSTPPUPUPUSSSS2222LLLL22225555U C2C2CC22 L5L5LL55989898983 GNGNGNGNDDDD RRKRKRK1111 4444....99999999K 7777 FFBFBFBB 2F2F2F22222uuuuF C1C1C1C1 C6C6C6C6 5555 6666 4444 1F1F1F10000uuuuF 6F6F6F68888nnnnF CCFCFCF4444 11110000nnnnF COCCOCOCOCOCCOOOMPMMPMPMPMPMPMPP FFSFSFSSWWWW RRRR3333 0 0 0 333333330 CnCnCCn3333 2222....2222nFFFF R9RR9R94444 2222....44449KKKK RRK55 110000K RKRRKRK2222 1111....1111K CFCFCFC5555 222222220000ppppF 2/4 DocID025361 Rev 1