5 E1 4 3 2 1 REVISION HISTORY VIN 3 RUN ON ECO REV __ RUN JP1 2 DESCRIPTION 2 PRODUCTION APPROVED MIKE S. DATE 11-8-11 R1 OPT OFF 1 R2 OPT C1 OPT INTVCC D D R16 OPT INTVCC R25 0 R3 0 E2 VIN+ VIN C2 0.1uF 4 R7 Q7 OPT 4 CIN4 22uF 16V 1210 20 19 C5 1uF C4 4.7uF 16V 0805 R9 OPT 0.44uH R10 OPT VINRS2 0.002 2512 C7 0.1uF R14 2.2 E19 +COUT4 INFINEON BSC050NE2LS 5 6 7 8 5 6 7 8 17 Q5 OPT CIN3 22uF 16V 1210 PGND S1+ R17 10 1 2 3 1 2 3 L1 Q2 EXTVCC INFINEON BSC010NE2LS R32 100K R21 OPT 0.44uH 5 6 7 8 +COUT2 330uF 2.5V 7343-D15T Q6 OPT +COUT1 C 330uF 2.5V 7343-D15T E21 E22 GND R20 OPT R24 OPT R19 10 RS1 0.002 2512 COUT5 100uF 6.3V 1206 E8 VO_SNS+ S1- 1 2 3 CMDSH-3 330uF 2.5V 7343-D15T CIN5 OPT 1210 4 4 +COUT3 330uF 2.5V 7343-D15T 18 VOUT E20 1.5V / 40A VOUT Q1 E7 R35 0 COUT6 100uF 6.3V 1206 1 2 3 Q4 C12 0.1uF D1 C13 1uF E18 GND OPTIONAL DCR SENSE FILTER / DIVIDER FOR PHASE 2 INFINEON BSC010NE2LS 4 R31 OPT E10 5 6 7 8 5 6 7 8 21 1 2 3 R12 2.2 INTVCC 4 EXTVCC 180uF 16V S2- 23 EXTVCC 22 R23 0 R26 R27 10 10 R29 10K OPT SANYO-F8 1 2 3 1 2 3 25 SW2 TG2 BOOST2 S1- CIN7 1210 OPT VIN 4.5V - 14V +CIN1 E3 Q8 OPT 4 5 6 7 8 C11 1nF 4 1 2 3 S1+ 24 33 10 9 TRK/SS R28 0 R22 15K BG1 SW1 OPT E5 E6 RUN DRVCC1 VOUTSENSE+ CLKOUT C10 OPT SGND TRACK/SS TG1 8 C9 0.01uF VIN 16 R18 PGND ITH BOOST1 7 E4 PLLIN RT 15 6 PGOOD 4 C8 470pF INTVCC 14 5 C6 68pF R15 22.1K SGND DTR DCM C EXTVCC 13 R13 137K 3 CLKOUT 12 SYNC 4 DRVCC2 SENSE1- FSW = 300kHz 2 BG2 MODE/PLLIN 11 FCM L2 PHASEMD SENSE1+ 3 1 MODE JP3 2 R11 10K VOUTSENSE- 1 CIN8 1210 OPT +CIN2 R8 OPT 26 27 28 0 SENSE2- VRNG SENSE2+ INTVCC CIN6 OPT 1210 S2+ 4 60 DEG C3 1nF 29 U1 LTC3839EUH 3 S2+ R6 OPT R5 10 S2- 30 PHASMD JP2 31 90 DEG 2 32 120 DEG Q3 5 6 7 8 R4 10 E17 INFINEON BSC050NE2LS CMDSH-3 5 6 7 8 D2 1 INTVCC OPTIONAL DCR SENSE FILTER / DIVIDER FOR PHASE 1 E9 VO_SNSE11 GND INTVCC GND B B E12 PGOOD SGND VOUT J1 OPTIONAL COUT 1 5 4 3 2 VOUT NOTES: UNLESS OTHERWISE SPECIFIED GND VOUT 3 1. ALL RESISTORS ARE IN OHMS, 0603. ALL CAPACITORS ARE IN MICROFARADS, 0603. 2. INSTALL SHUNTS ON JUMPERS AS SHOWN. A 2 E15 Q9 SUD50N03-12P 1 R33 10K ISTEP+ R34 0.005 2010 E16 ISTEPLOAD STEP 5mV / A 5% DUTY CYCLE MAX E13 + PULSE GEN COUT9 OPT 7343-D15T +COUT10 OPT 7343-D15T E14 A GND CUSTOMER NOTICE +COUT11 OPT 7343-D15T LOAD STEP CIRCUIT COUT12 + OPT 7343-D15T 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 HZ MIKE S. TITLE: SCHEMATIC FAST TRANSIENT STEP-DOWN DC/DC CONVERTER SIZE THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 5 4 3 2 N/A SCALE = NONE 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. REV. LTC3839EUH 2 DEMO CIRCUIT 1632A Tuesday, February 07, 2012 SHEET 1 1 OF 1