1 2 3 4 5 6 Revision History Rev. ECO Description Date Approved A A + VIN 1 PITP101 1 PITP501 NET00001 COTP5 TP5 4u7 COL1 L1 PIL102 PIRT10 PIL101 1 COSW4 SW4 5 VOUTPIU105 P1 RB1 P1 NET00011 PITP901 1 PITP801 1640_DFN_2X3MM 1M P1 P1 1 PIRT402 COL2 CORT4 CORT5 2 COSW3 SW3 EN Switch PIRT401 COTP6 TP6 PIC601 PIC802 PIC602 PIC801 PISW301 NET00014 10uF PISW302 PGND VOUTP EN 5 PIU205 4 PIU204 PISW303 SW NET00013 GND P2 POFB FB CORB2 RB2 PIU209 P2 S2 GND GND GND C 3.3V PIC502 PIRB20 PIC501 PISW101 PISW103 Vout SEL 309k P2 GND COSW1 SW1 NET00006 EP dnp COC8 C8 6 PIU206 PISW102 5.0V 9 COC6 C6 7 SGND VOUTPIU207 3 PIU203 - PIRT501 8 VIN PIU208 PIU202 Vout 1 PITP601 NET00004 1 POFB FB PIU201 FB + PIRT502 P2 GND VFB = 1.23V - MCP16251 P1 COTP7 TP7 PIL201 COU2 U2 P1 PITP701 PIL20 COTP8 TP8 C B Note: Calculate RT resitors for a particular Vout as: VFB = 1.21V - MCP1640 P1 P1 4u7 - dnp RT = RB * ((Vout / VFB) - 1) S1 P1 COTP9 TP9 GND 10uF COC4 C4 PIRB10 S1 1 + CORB1 10uF L2 VIN P1 MCP16251 P1 P1 PIRB102 PISW403 RT5 P1 COC1 C1 PIC401 PIC402 COC2 C2 1M2 dnp PIC301 PIC102 PIC302 PIC10 P1 PIC20 PIC201 Vout SEL 4 FBPIU104NET00000 RT4 COC3 C3 B 3 PIU103EN GND 2.0V PISW201 PISW203 NET00002 PISW401 PISW402NET00005 COTP3 TP3 COSW2 SW2 6 VINPIU106 SW 2 PIU102 GND PISW202 3.3V NET00010 PIU101 EN Switch 1 PITP301 NET00003 COU1 U1 P1 Vout PIRT201 976k P1 CORT2 1M CORT1 COTP2 TP2 + PIRT20 RT2 RT1 - GND 1 PITP201 1.69M PIRT102 COTP1 TP1 10uF PIC701 PIC702 COC7 C7 dnp PIRB201 S2 GND P2 GND COC5 C5 P2 GND P2 GND Drawn Mihai Tanase Checked D Printed 4/17/2013 1 2 3 4 Date Approved Date Approved Date Approved Date at 3:03:30 PM Template FileName 02-03-2011 Date Title D MCP16251 & MCP1640B Synch Boost Converters Eval Board Size B B_Microchip SCH.SchDoc Doc. Number Rev. ADM00458 1.0 Sheet 1 of 1 5 6