5 4 3 2 1 REVISION HISTORY ECO REV DESCRIPTION __ 2 PRODUCTION APPROVED DATE MIKE S. 06-07-11 E1 VO_SNS+ E2 VO_SNS- D D E3 VIN+ U1 LTC3833EFE R25 OPT C4 OPT C R10 15K E6 R11 10K 6 7 R14 OPT C6 C7 0.01uF C9 68pF 33.2k R15 R16 10 * INTVCC R17 SW VOUT BG VOSNS- PGND VOSNS+ INTVCC TRK/SS VIN ITH MODE/PLLIN VRNG EXTVCC RT RUN 16 15 14 INTVCC C5 4.7uF 16V 0805 R13 2.2 EXTVCC 11 1 2 3 1 2 3 OPT Q4 * R4 10 R5 10 E5 VOUT RS1 2512 COUT1 100uF 6.3V 1206 * COUT2 100uF 6.3V 1206 +COUT3 330uF 2.5V 7343 J3 +COUT4 S- VINVOUT 1.5V / 15A J4 330uF 2.5V 7343 GND C ONLY APPLY LOAD FROM J3 TO J4 DCR SENSE FILTER / DIVIDER FSW = 300kHz VOUT J5 R21 OPT J2 C10 1uF R19 OPT 1 2 3 47uF 35V SANYO 35SVPD47M * R9 D2 OPT SMA VIN 4.5V - 24V C8 0.1uF 25V 13 12 4 RJK0330DPB Q2 4 +CIN5 GND R7 * 17 47uF 35V SANYO 35SVPD47M * L1 18 CIN3 1210 OPT VOUT C3 OPT 0805 C11 OPT 2 ON OFF SNS- R18 137K * VIN 8 9 470pF JP1 RUN 4 5 R12 0 TRK/SS 3 19 CIN2 10uF 25V 1210 S+ 1 * S- TG D1 CMDSH-3 2 * SNS+ C1 0.1uF 25V 5 2 C2 R3 0 1 2 3 R24 0 * R2 5 R8 20 1 2 3 VOUT S+ BOOST 1 R6 PGOOD SGND 1 CIN1 10uF 25V 1210 OPT Q3 +CIN4 J1 21 E4 4 RJK0305DPB Q1 4 2 R1 100K PGOOD 5 INTVCC 5 VIN EXTVCC R23 10k E9 EXTVCC JP2 MODE 1 CCM 2 3 DCM E10 PLLIN J6 LOAD STEP 10mV / A 5% DUTY MAX COUT6 OPT 1206 Q5 SUD50N03-12P 1 E7 3 B COUT5 OPT 1206 B PULSE GEN E8 R20 10K GND R22 0.01 2010 LOAD STEP CIRCUIT NOTES: UNLESS OTHERWISE SPECIFIED 1. ALL RESISTORS ARE IN OHMS, 0603. ALL CAPACITORS ARE IN MICROFARADS, 0603. CUSTOMER NOTICE 2. INSTALL SHUNTS ON JUMPERS AS SHOWN. A * ASSY -A (DCR SENSE) -B (RSENSE) C2 0.1uF 1000pF R3 4.02k OPT R6,R8 R7 OPT 10 13.3k OPT R9,R17 R16 RS1 0 OPT OPT 0 0 0.0025 L1 0.56uH 0.68uH THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 5 4 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. 3 TECHNOLOGY KT MIKE S. TITLE: SCHEMATIC WIDE INPUT RANGE, HIGH EFFICIENCY STEP-DOWN DC-DC CONVERTER SIZE N/A SCALE = NONE 2 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only DATE: IC NO. LTC3833EFE REV. 2 DEMO CIRCUIT 1516A Tuesday, June 07, 2011 SHEET 1 1 OF 1 A