5 4 3 2 1 This circuit is proprietary to Linear Technology and supplied for use with Linear Technology parts. Customer Notice: Linear Technology has made a best effort to design a circuit that meets customer-supplied specifications; however, it remains the customers responsibility to verify proper and reliable operation in the actual application, Component substitution and printed circuit board layout may significantly affect circuit performance or reliability. Contact Linear Applications Engineering for assistance. D D L1 10uH LQH32CN100K53 U1 E1 VIN + C 3 C3 33uF 10V (Opt) VIN VOUT JP1 VOUT E2 VOUT 4 C2 10uF 6.3V C1 2.2uF E3 GND ON * 2 GND 1 SHDN GND 5 SW 6 C4 0.22uF C E4 GND R1 2.2M 1 2 OFF 3 B B E5 SHDN BOARD ASSEMBLY U1 DC879A-A A DC879A-B LTC3525ESC6-3.3 LTC3525ESC6-5 VIN VOUT/Imax 1.8V-3.2V 3.3V/140mA 1V-3.2V 3.3V/60mA 3V-4.5V 5V/175mA 1V-4.5V 5V/40mA ,-# .& / & $#-$ 0 1 * 20# 30-" ## 4 5* 20# 30-0 #$# %& ' 5 4 A 3 * ( 2 ! ) ! "##$ 1 +