for further information contact your local stmicroelectronics sales office. january 2014 docid025790 rev 1 1/4 STEVAL-ISA075V1 compact high efficiency dc-dc converter solution based on the l6738 data brief features ? compact size (25.4 mm x 14.6 mm) ? 4 layers ? v in < 6 v ? v out up to 3.5 v ? i out up to 8 a (depending on v out ) ? f sw = 600 khz ? dual power mos option (2 x stl 3x3 or 1 x dual so8) ? c in = 2 x grm21br60j226me39 (22 uf,6.3 v, 0805) ? c out = 2 or 3 x grm31cc70g226ke01 (22 uf, 4 v, 1206) ? dual choke options (we 744310095 or vitec 59px8970) ? rohs compliant 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. www.st.com
schematic diagram STEVAL-ISA075V1 2/4 docid025790 rev 1 1 schematic diagram figure 1. STEVAL-ISA075V1 circuit schematic pgood pull-up power in options r13 = f(vout) = = 0.8v * r9 / ( vout - 0.8v ) = = 2.16k / ( vout - 0.8v ) place on the bottom comp ugate vin lsg1 boot b fb fb f vin lsg1 pgood csp csn comp vsen vss_sense sync pgood csp lgate csn vcc_dr phase boot ugate gnd vcc fb out ugate lgate vsen vss_sense vcc_sense vin vcc vin vcc_dr vin phase phase gnd phase vss_sense vcc_sense out 0 0 0 0 0 0 0 0 0 0 0 0 3 d c3 d c f n 0 0 1f n 0 0 1 3 r w p j3 r w p j n i p 2 n i p 2 1 2 1 d u1 d u 8 3 7 6 l t s8 3 7 6 l t s vccdr 1 lgate 2 phase 3 boot 4 ugate 5 pgood 6 synch 7 comp 8 fb 9 vsen 10 fbg 11 csn 12 csp 13 osc / en 14 vcc 15 gnd 16 epad 17 4 r w p j4 r w p j n i p 2n i p 2 1 2 3 1 r3 1 r ) t u o v ( f =) t u o v ( f = 2 1 c 2 1 c 10uf 16v 0805 10uf 16v 0805 b s l qb s l q stl15n3llh5 stl15n3llh5 4 5 1 6 7 8 2 3 a s h qa s h q sts9d8nh3ll sts9d8nh3ll 4 3 56 4 1 r4 1 r r 0 4 2r 0 4 2 5 3 c5 3 c f p 8 6f p 8 6 6 r6 r 9 r = 9 r = 1 5 r1 5 r r 0 0 1r 0 0 1 5 r 5 r 3 0 6 0 2 r 23 0 6 0 2 r 2 9 1 r9 1 r k 0 1k 0 1 1 m c t c1 m c t c f n 0 1f n 0 1 b s h qb s h q stl15n3llh5 stl15n3llh5 4 5 1 6 7 8 2 3 3 4 c3 4 c 22uf 4v 1206 22uf 4v 1206 6 3 c 6 3 c f n 2 . 2f n 2 . 2 1 m c t r 1 m c t r k 8 6k 8 6 5 4 c5 4 c c nc n 2 l2 l 950nh - 6.2mohm 950nh - 6.2mohm we 744310095 we 744310095 1 2 8 r 8 r 3 1 r =3 1 r = 1 1 c1 1 c 10uf 16v 0805 10uf 16v 0805 3 p j 3 p j 1 2 0 1 c0 1 c f n 0 2 2 f n 0 2 2 8 3 c8 3 c 1uf 16v 0603 1uf 16v 0603 7 r7 r k 6 . 8 k 6 . 8 2 r 2 r 2 r 22 r 2 6 1 r6 1 r 2 r 22 r 2 a s l qa s l q sts9d8nh3ll sts9d8nh3ll 2 1 78 2 m c t r 2 m c t r k 0 2 k 0 2 1 p j1 p j 1 2 9 r9 r k 7 . 2 k 7 . 2 4 2 c4 2 c f n 5 . 1f n 5 . 1 4 4 c4 4 c 22uf 4v 1206 22uf 4v 1206 1 c s o r1 c s o r k 0 3k 0 3 2 p j2 p j 1 2 4 1 c4 1 c 1uf 16v 0603 1uf 16v 0603 gspg0310di1500
docid025790 rev 1 3/4 STEVAL-ISA075V1 revision history 4 2 revision history table 1. document revision history date revision changes 15-jan-2014 1 initial release.
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