STEVAL-ISA053V2

STEVAL-ISA053V2 Demonstration board for the PM6680A dual synchronous step-down controller with adjustable output voltages plus LDO Data Brief Features ■ Constant on-time control allows very fast load transients ■ 6 V to 36 V input voltage range ■ 5 V auxiliary output voltage ■ Adjustable switching outputs ■ Lossless current sensing ■ Negative current limit ■ Soft-start internally fixed at 2.8 ms ■ Soft-end for output discharge ■ 200 kHz / 300 kHz, 300 kHz / 400 kHz, 400 kHz / 500 kHz (OUT1 / OUT2 selectable switching frequency) ■ Selectable pulse skip and no-audible skip modes at light loads ■ Independent power good signals ) s t( c u d e t le o r P o s b O ) s ( t c STEVAL-ISA053V2 u d o Description r P e The PM6680A is a dual step-down controller with adjustable output voltages. This demonstration board is designed to test the performance of the PM6680A by employing a typical application circuit which allows testing of all the PM6680A device functions. The kit features two switching sections, with (typically) 3.3 V and 1.8 V outputs, from a 6 V to 36 V input voltage. t e l o s b O The typical operating switching frequency of the two switching sections is 200 kHz / 300 kHz, respectively. Each switching section delivers more than 2.5 A of output current. Moreover, an internal linear regulator can provide 5 V @ 100 mA peak current. June 2008 Rev 1 For further information contact your local STMicroelectronics sales office. 1/4 www.st.com 4 OUT1- J8 1 1 OUT5V OUT1+ J4 1 3 FB1 R27 ? SGND 2 R28 ? C25 100n S9 JP3SO PGND 1K R24 330uF + C11 S5 JP2SO 2 1 2 330uF + C12 SGND D2 SMA 5V C23 10pF 1 NM NM L2 R4 PGND NM C14 R6 1 2 8 7 6 5 V5SW OUT5V R17 560K R16 100K SGND VIN 100pF C16 C10 100n R19 560K M2 MOSFET-N-SO8 PGND C4 15u SGND C18 NM 4 V+ V+ EXT5V J11 100K 100K PGOOD2 PGOOD1 J7 J6 V+ V+ M4 MOSFET-N-SO8 4 C6 100n BOOT1 V+ R13 R1 R12 R1 0R R23 3 R8 1 R14 R15 OUT5V V5SW S2 SWDIP-4 100K 100K SGND BOOT2 LDO_FB 500R 0R R22 10R R10 BAT54A/SOT R9 47R 5 27 26 16 30 29 17 20 15 21 22 23 SGND SHDN PGOOD2 PGOOD1 LDO_FB COMP1 OUT1 V5SW CSENSE1 LGATE1 PHASE1 HGATE1 BOOT1 220nF C22 V+ SGND U1 C20 1uF HGATE2 BOOT2 CREF 100n 11 10 9 SGND + SGND 7 28 6 2 8 1 14 12 13 R7 R11 SGND PGND 0R R20 10R 500R 0R S12 S1 2 RLD5V 100K SGND R21 R2 C21 4u7 C27 1uF S10 JP4I LDO_FB SGND FB1 PM6681_VFQFPN32 LDO FB1 FB2 COMP2 OUT2 SGND PGND CSENSE2 LGATE2 PHASE2 EN2 4 C3 15u EN1 25 3 2 1 18 VREF 8 7 6 5 31 VCC SKIP SKI 32 3 2 1 19 FSEL FSE 3 24 LDO5 LDO BOOT1 2 2 8 7 6 5 1 2 3 4 VIN 4 V+ 3 1 D1 JP2SO 1 2 S13 S1 2 + 4 4 SGND C5 100n C19 100n R26 3R9 C26 4u7 LIKE 4-PIN JUMPER A - S12 CLOSED B - S14 CLOSED C - S12.1 TO S14.2 SGND BOOT2 JP3SO S1 JP2SO 1 2 3 1 S3 JP4I SGND V+ SGND + M1 MOSFET-N-SO8 C28 4u7 PGND SGND R33 ? R32 ? C17 NM D3 SMA o r P SGND NM C9 100n R18 560K 1 1 150pF C15 C2 15u R3 PGND R31 ? SGND M3 MOSFET-N-SO8 C1 15u 1 J3 LDO5V+ 3 VIN O ) o s b e t le 4 5 6 7 8 1 2 3 5 6 7 8 1 2 3 s ( t c 2 2/4 LDO_ADJ 2 NM C24 100n 3V3 L1 NM C13 R5 PGND PGND 1K R25 R29 ? R30 ? VIN SGND NM NM PGND + C8 1 1 + C7 S4 JP2SO NM + CIN 2 s b O t e l o u d o 1 r P e J2 -VIN J5 +VIN 1 3 PGND S8 JP3SO 1 1 PGND J10 OUT2- OUT2+ J1 J9 1 Figure 1. 2 1 1 Circuit schematic STEVAL-ISA053V2 Circuit schematic Schematic diagram ) s t( c u d STEVAL-ISA053V2 2 Revision history Revision history Table 1. Document revision history Date Revision 06-June-2008 1 Changes Initial release. ) s t( c u d e t le o r P o s b O ) s ( t c u d o r P e t e l o s b O 3/4 STEVAL-ISA053V2 ) s t( Please Read Carefully: c u d Information in this document is provided solely in connection with ST products. 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