5 4 3 2 1 REVISION HISTORY ECO REV - 2 DESCRIPTION PRODUCTION FAB L1 EPL3015-103 GND RUN RUN 5 MPPC VCC 3 C9 2.2uF 13 14 SW2 16 1 MPPC VCC 6 U1 LTC3129EUD OPT VOUT 12 R1 2M 1% R3 2.21K PWM 10 NC 8 B OFF JP1 R8 OPT RUN C10 10pF MPPC E4 MPPC PWM NOTE: UNLESS OTHERWISE SPECIFIED 1. ALL RESISTORS ARE IN OHMS, 0402 ALL CAPACITORS ARE IN MICROFARADS, 0603. R9 OPT VCC PWM C11 OPT 6.3V JP3 PGOOD 3 NC APP ENG. J.NOON SCALE = NONE VSUPPLY NC GND PGOOD KEY VBAT RSVD EHORBAT I/O 2 I/O 1 +5V V+ 2 4 6 8 10 12 B Q1 ZXMN2F30FH APPROVALS PCB DES. PGOOD SMH-106-02-L-D-05 1 LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S 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 TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. 4 1 3 5 7 9 11 BURST MODE THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 5 CAUTION: ONLY CONNECT IF VOUT IS CONFIGURED FOR 3.3V FIXED FREQ CUSTOMER NOTICE A VOUT J1 2 VCC C JP4 R7 OPT JP2 GND NC OFF E5 R2 619k 1% VOUT R6 2M ON C4 1uF 25V PWM 3 RUN ON R4 2M D VOUT 5.0V / 200mA VIN > VOUT PGOOD NC 9 VIN R5 2M C3 22uF 10V 1210 E3 PGOOD DUST PWR VIN 01 - 02 - 13 PGOOD 11 D1 VOUT C7 33pF FB 7 GND C C6 22nF 50V BST2 4 PGND E2 C2 1uF 25V J.NOON 15 OPT 7343 C1 22uF 25V 1210 VIN GND + C8 2 17 2.4V - 15V SW1 E1 VIN BST1 VIN DATE VOUT D C5 22nF 50V APPROVED TECHNOLOGY 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only TITLE: SCHEMATIC 15V, 200mA SYNCHRONOUS BUCK - BOOST DC / DC CONVERTER WITH 1.3uA QUIESCENT CURRENT SIZE IC NO. REV. LTC3129EUD N/A 2 DEMO CIRCUIT 1922A DATE: 01 - 02 - 13 2 SHEET 1 1 OF 1 A