STEVAL-ISA053V1 Demonstration board for the PM6680 dual step-down controller with adjustable output voltage for notebook power system Data Brief Features ■ Constant on-time control allows very fast load transients ■ 6 V to 28 V input voltage range ■ 5 V auxiliary output voltage ■ Accurate current limit with sense resistor ■ 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 (5 V / 3 V selectable switching frequency) ■ Selectable pulse skip and no-audible skip modes at light loads ■ Independent Power Good signals STEVAL-ISA053V1 Description The PM6680 is a dual step-down controller with adjustable output voltages for notebook computer power systems. The STEVAL-ISA053V1 demonstration board is designed to test the performance of the PM6680 by employing a typical application circuit which allows testing of all PM6680 device functions. The board features two switching sections, with (typically) 1.5 V and 1.05 V outputs, from a 6 V to 28 V input battery voltage. The operating switching frequency of the two switching sections is 200 kHz / 300 kHz, respectively. Each switching section delivers more than 5 A of output current. Moreover, an internal linear regulator can provide 5 V @ 100 mA peak current. September 2008 Rev 1 For further information contact your local STMicroelectronics sales office. 1/4 www.st.com 4 OUT1- J8 OUT1+ J4 1 1 OUT5V 1 3 FB1 R27 ? SGND 2 R28 ? C25 100n S9 JP3SO PGND 1K R24 330uF + C11 S5 JP2SO 2 1 2 L2 330uF + C12 SGND D2 SMA 5V C23 10pF 1 R4 NM NM PGND NM C14 R6 1 2 V5SW OUT5V R17 560K S11 JP4I R16 100K SGND VIN 100pF C16 C10 100n R19 560K M2 MOSFET-N-SO8 PGND C4 15u 8 7 6 5 3 2 1 SGND SGND C18 NM 4 V+ V+ EXT5V J11 R14 100K 21 5 27 26 16 30 29 OUT5V 20 15 17 S2 SWDIP-4 100K R13 R1 R15 100K 23 22 V5SW SGND BOOT2 LDO_FB 500R R8 1 R12 R1 0R R23 0R R22 10R 100K PGOOD2 PGOOD1 J7 J6 V+ V+ M4 MOSFET-N-SO8 4 C6 100n BOOT1 R10 BAT54A/SOT SGND SHDN PGOOD2 PGOOD1 LDO_FB COMP1 OUT1 V5SW CSENSE1 LGATE1 PHASE1 HGATE1 BOOT1 220nF C22 R9 47R V+ BOOT2 CREF 100n SGND U1 7 28 6 2 8 1 14 12 13 11 10 9 SGND + SGND C27 1uF S10 JP4I LDO_FB SGND FB1 2 S13 S1 2 S12 S1 2 500R R7 SGND 0R PGND 0R R20 10R R11 SGND RLD5V 100K R21 R2 C21 4u7 PM6681_VFQFPN32 LDO FB1 FB2 COMP2 OUT2 SGND PGND CSENSE2 LGATE2 PHASE2 HGATE2 SGND C20 1uF 4 BOOT1 EN2 2 EN1 25 8 7 6 5 2 18 VREF C3 15u 4 31 VCC 19 VIN SKIP SKI 32 LDO5 LDO FSEL FSE 3 24 D1 2 3 4 V+ 8 7 6 5 1 2 3 4 VIN 3 1 V+ 3 1 SGND JP3SO S1 JP2SO 1 JP2SO 1 + 4 4 SGND C5 100n C19 100n S3 JP4I + V+ SGND SGND R26 3R9 C26 4u7 LIKE 4-PIN JUMPER A - S12 CLOSED B - S14 CLOSED C - S12.1 TO S14.2 SGND BOOT2 2 3 2 1 3 1 3 C28 4u7 PGND M1 MOSFET-N-SO8 5 6 7 8 1 2 3 SGND R33 ? D3 SMA SGND R31 ? R32 ? 1 1K PGND NM + C7 150pF 1 PGND S4 JP2SO R25 LDO_ADJ C24 100n 3V3 PGND NM + CIN C15 C9 100n R18 560K 2 NM L1 R3 R5 NM C2 15u NM C13 PGND C17 NM C1 15u SGND M3 MOSFET-N-SO8 5 6 7 8 1 2 3 J3 LDO5V+ 4 1 2 2 1 2/4 R30 ? R29 ? SGND NM + C8 1 1 VIN 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-ISA053V1 Circuit schematic Schematic diagram STEVAL-ISA053V1 2 Revision history Revision history Table 1. Document revision history Date Revision 29-Sep-2008 1 Changes Initial release. 3/4 STEVAL-ISA053V1 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. 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