5 4 3 2 1 REVISION HISTORY ECO REV DATE 1 DESCRIPTION PRODUCTION APPROVED - JIM N. 01-21-10 2 PRODUCTION JIM N. 04-06-10 L1 4.7uH XPL4020-472ML D VIN 1.8V - 5.5V VIN E1 2 + E2 CIN3 68uF 6.3V CIN2 10uF 6.3V * GND C1 100pF CIN1 10uF 6.3V 8 3 R4 499K 1% R7 0 Ohm VIN RUN C Coilcraft U1 LTC3127EDD 4 5 C2 (Opt) R6 60.4K 1% D 1 10 SW1 SW2 VIN VOUT VOUT E3 9 R1 0 Ohm VC R2 1M 1% CO1 10uF 6.3V CO2 + 2200uF 6.3V CO3 + 2200uF 6.3V CO4 + 2200uF 6.3V CO5 + (Opt) VOUT 3.8V @ 2A PULSE LOAD CO6 (Opt) E4 GND C3 (Opt) SHDN MODE PROG FB SGND PGND 6 11 7 C4 (Opt) R3 464K 1% 1 ON C 2 3 OFF R8 10M JP1 MODE BURST DYNAMIC LOAD CIRCUIT VIN 1 2 3 FCC JP2 VOUT E5 R5 10M IOSTEP CLK R9 B B 10K Q1 SUD50N03-10 J1 R13 IOSTEP 10mV / Amp 51 R10 0.01 1W R11 (Opt) 2512 E6 GND CUSTOMER NOTICE A * FOR DEMO BOARD USE ONLY APPROVALS LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES. VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APP ENG. APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. TECHNOLOGY RB JIM N. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. HIGH EFFICIENCY BUCK-BOOST DC/DC CONVERTER WITH ADJUSTABLE INPUT CURRENT FOR PULSE LOADS 5 4 3 N/A SCALE = NONE A LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY TITLE: SCHEMATIC SIZE C:\ORCADWIN\CAPTURE\1451A\1451A_REV2.DSN 1630 McCarthy Blvd. Milpitas, CA 95035 www.linear.com Phone: (408)432-1900 Fax: (408)434-0507 DATE: 2 IC NO. REV. LTC3127EDD DEMO CIRCUIT 1451A Thursday, June 17, 2010 2 SHEET 1 1 OF 1