User`s guide

Board Layouts and Schematics
© 2008 Microchip Technology Inc. DS70320B-page 83
FIGURE A-9: BUCK CONVERTER GATE DRIVE SCHEMATIC
DRIVE_SUPPLY
PULLUP_SUPPLY
DRIVE_SUPPLY
NEG_OUT 3.3V_BUCK#3_FW_GATE NEG_OUT
5V_BUCK_FW_GATE
3.3V_BUCK#1_FW_FIRE
DRIVE_SUPPLY
3.3V_BUCK#1_FW_GATE
D18
BAT54S_SOT23
PULLUP_SUPPLY
3.3V_BUCK#3_FW_FIRE
3.3V_BUCK#3_CONTROL_FIRE
PULLUP_SUPPLY
3.3V_BUCK#3_CONTROL_GATE 3.3V_BUCK#1_CONTROL_GATE
NEG_OUT NEG_OUT
3.3V_BUCK#1_CONTROL_FIRE
DRIVE_SUPPLY DRIVE_SUPPLY
D17
BZX84C5V1
D33
BAT54S_SOT23
D16
BAT54S_SOT23
MCP1404-E/SN_SO8N
MCP1404-E/SN_SO8N
D43
BAT54S_SOT23
D44
BAT54S_SOT23
MCP1404-E/SN_SO8N
D24
BAT54S_SOT23
D26
BAT54S_SOT23
MCP1404-E/SN_SO8N
5V_BUCK_FW_FIRE
5V_BUCK_CONTROL_FIRE
PULLUP_SUPPLY
3.3V_BUCK#2_FW_FIRE
3.3V_BUCK#2_CONTROL_FIRE
3.3V_BUCK#2_FW_GATE
PULLUP_SUPPLY
5V_BUCK_CONTROL_GATE
3.3V_BUCK#2_CONTROL_GATE
D36
BAT54S_SOT23