STEVAL-ISA075V1

STEVAL-ISA075V1 Compact high efficiency DC-DC converter solution based on the L6738 Data brief Description The STEVAL-ISA075V1 product evaluation board is a compact solution designed for testing the performance of the L6738. The L6738 is a single-phase step-down controller with integrated high-current drivers that provides complete control logic and protection for DC-DC converters. Features • Compact size (25.4 mm x 14.6 mm) • 4 layers • VIN < 6 V • VOUT up to 3.5 V • IOUT up to 8 A (depending on VOUT) • FSW = 600 KHz • Dual power MOS option (2 x STL 3x3 or 1 x Dual SO8) • CIN= 2 x GRM21BR60J226ME39 (22 uF,6.3 V, 0805) • COUT = 2 or 3 x GRM31CC70G226KE01 (22 uF, 4 V, 1206) • Dual choke options (WE 744310095 or VITEC 59Px8970) • RoHS compliant January 2014 DocID025790 Rev 1 For further information contact your local STMicroelectronics sales office. 1/4 www.st.com 3 4 PHASE BOOT PGOOD Pull-Up PGOOD R19 10k 2 LGATE OUT 1 VCC_DR POWER IN OPTIONS 0 C38 1uF 16V 0603 BOOT PHASE LGATE VCCDR UD1 0 GND ROSC1 30k 17 0 R16 2R2 VCC ST L6738 VIN UGATE 1 2 VSEN FB 9 CTCM1 10nF CD3 100nF 0 COMP C35 68pF R7 R7 8.6k LGATE PHASE C10 220nF BOOT UGATE C24 1.5nF R13 =F(Vout) R14 240R QLSa STS9D8NH3LL 0 1 7 8 QHSa 3 STS9D8NH3LL VIN R9 R9 2.7k C36 2.2nF CSP JP1 VSS_SENSE 8 R8 R =R13 VSEN R6 R 6 =R9 JP2 L2 L2 950nH - 6.2mOhm WE 744310095 2 1 0 C11 10uF 16V 0805 VCC_SENSE PLACE ON THE BOTTOM R5 R5 2R2 0603 LSG1 2 4 5 6 R13 = F(Vout) = = 0.8V * R9 / ( Vout - 0.8V ) = = 2.16k / ( Vout - 0.8V ) CSN CSP JPWR3 2PIN RTCM1 68k 10 0 VSS_SENSE VIN 11 12 RTCM2 20k PGOOD SYNC COMP FB VSEN FBG CSN C14 1uF 16V 0603 VCC F FB B VIN 2 1 2 R2 R 2R2 UGATE 5 PGOOD 6 COMP EPAD 15 VCC 16 GND 13 CSP 14 OSC / EN SYNCH 7 DocID025790 Rev 1 8 2 CSN 0 C44 22uF 4V 1206 0 0 0 C45 NC NC VCC_SENSE 0 J P3 OUT PHASE QHSb STL15N3LLH5 5 6 7 8 VSS_SENSE UGATE 4 C43 22uF 4V 1206 C12 10uF 16V 0805 VIN R 51 100R LSG1 1 2 JPWR4 2PIN 4 3 2 1 1 2/4 1 2 3 PHASE GND QLSb STL15N3LLH5 8 7 6 5 2 1 1 VCC_DR Schematic diagram STEVAL-ISA075V1 Schematic diagram Figure 1. STEVAL-ISA075V1 circuit schematic GSPG0310DI1500 STEVAL-ISA075V1 2 Revision history Revision history Table 1. Document revision history Date Revision 15-Jan-2014 1 Changes Initial release. DocID025790 Rev 1 3/4 4 STEVAL-ISA075V1 Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale. Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no liability whatsoever relating to the choice, selection or use of the ST products and services described herein. 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