5 4 D 3 2 L1 2.2uH D1 D D2 SD12-2R2 Cooper Bussmann PMEG2010EA (Opt) D3 (Opt) 1 PMEG2010EA (Opt) U1 LTC3444EDD E3 VIN 3.1V-5V C GND E5 C4 + 47uF 10V C5 4.7uF 6.3V 2 SW1 SW2 4 6 VIN VOUT 5 1 SHDN FB 8 GND VC 7 3 GND 9 R1 (Opt) C3 (Opt) C2 4.7uF 6.3V 10% R2 340K 1% R3 205K 1% C6 (Opt) C7 R5 TBD C1 1uF 6.3V E1 VOUT 0.8V-4.2V@400mA E2 GND E4 VCONTROL C R4 267K 1% TBD R6 0 Ohm JP1 VOUT ON 1 2 OFF 3 B R7 100K B APPROVALS 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. A 5 4 DRAWN: Rudy Bautista ENGINEER: David Canny APPROVED: Size CHECKED: DCxxxA_00.PCB 3 1630 McCARTHY BLVD www.linear.com MILPITAS, CA. 95035 LTC Confidential (408)432-1900 (408)434-0507 (FAX) For Customer Use Only Title Micropower Synchronous Buck-Boost Converter for CDMA and HSDPA xxxA_x.DSN Document Number Date: Rev 1 Sheet 2 1 1 of 1 A