5 4 3 2 1 REVISION HISTORY E4 VIN+ VIN ECO REV DESCRIPTION __ 2 PRODUCTION APPROVED GL DATE 01/28/16 J4 VIN CIN2 22uF 25V 1206 + CIN1 4.5V-20V 100uF 25V 25SVPF100M J5 GND D CIN3 22uF 25V 1206 E16 E5 VIN- R13 0 PGOOD1 PGOOD2 CPWR E14 E1 INTVCC R11 10K D CPWR INTVCC C7 4.7uF R12 10K VO2+ VOUT1 VO1+ VOUT2 E11 GND F1 G1 VO1VO1- G2 R2 0 E7 H1 H2 VO1+ C COUT4 22uF 10V 1206 B6 VOUT1 VOUT2 VOUT1 VOUT2 VOUT1 VOUT2 VOUT1 VOUT2 VOUT1 VOUT2 o R4 C2 OPT 2 o F2 60 B4 D4 4 JP1 C3 E12 CLKOUT U1 VOUTSVOUTS1 R5 E4 EXTVCC INTVCC LTM4642IY 0 3 o F3 DRVCC B1 C20 4.7uF D6 C4 MODE/PLLIN CLKIN 1 2 OPT 0805 DCM 3 CCM 5 INTVCC OPT 4 D3 F4 OPT VFB1 R8 60.4K G3 INTVCC 30.1K G4 R33 TRACK1 SEL. 3 0 TRKSS2 VFB1 RUN2 C5 RUN1 SGND VRNG1 SGND 3 VOUT1 1 2 3 4 SOFT-START 5 6 EXT E2 GND GND GND GND GND GND H7 H6 H5 H4 F7 GND R9 VIN 255K RUN1 E7 E5 GND GND GND GND GND GND GND E1 D5 D1 C2 A7 A6 A4 0.01uF B TRACK2 SEL. D2 60.4K R21 60.4K C15 0.01uF R23 255K RUN2 VOUT1 60.4K R20 JP6 B3 TRKSS1 R34 OPT C5 1 C12 220pF VFB2 0 JP3 ON 60.4K VOUT2 C4 VIN 2 SOFT-START COMP1 GND TRACK R18 R19 F5 R7 VFB2 OPT R17 OPT OPT 0805 E3 B E8 SW1 C13 4.7uF 6.3V C3 6 JP2 TRACK1 C10 OPT H3 C E3 C9 R16 A3 C11 A5 CLKIN R6 VO2- R15 CPWR OPT E6 SW1 E10 C8 4.7uF R14 2.2 D7 FREQ COMP2 E9 EXTVCC MODE_PLLIN 49.9k VO2- C1 SW2 SW2 J3 B2 PHASMD CLKOUT VOUT2 1.2V / 4 A J8 150uF 4V R32 0 INTVCC 220pF R3 30.1k 1% + COUT6 GND A2 VFB1 1 120 COUT5 OPT 1206 A1 C1 CLKOUT PHASE INTVCC VOUT2 B7 VIN2 B5 VIN2 CPWR VIN2 C7 F6 G7 G6 C6 PGOOD2 150uF 4V J7 COUT1 22uF 10V 1206 PGGOD1 COUT2 OPT 1206 + COUT3 VIN1 G5 R1 0 VIN1 VOUT1 1.8V / 4 A R31 0 VIN1 VOUT1 J6 90 VO2+ E6 VO1+ R22 60.4K 3 ON E2 2 RUN2 C14 OPT 1 OFF TRACK2 E13 R24 OPT RUN2 JP5 2 1 OFF C6 OPT JP4 R10 OPT E15 RUN1 RUN1 CUSTOMER NOTICE A 4.5V<VIN<20V NOTE: UNLESS OTHERWISE SPECIFIED 1. ALL RESISTORS ARE IN OHMS, 0603. ALL CAPACITORS ARE IN MICROFARADS, 0603. 5 4.5V<VIN<5.3V CPWR=VIN DRVCC, CPWR=VIN 2.375V<VIN<4.5V CPWR= EXT. 5V 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 APPLICATION. COMPONENT SUBSTITUTION AND PRINTED APP ENG. CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. R13 = 0 OHM R15 = OPT R13 = 0 OHM R15 = 0 OHM R13 = OPT R15 = OPT TITLE: SCHEMATIC HIGH DENSITY, DUAL 4A STEP-DOWN m MODULE REGULATOR SIZE THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 4 TECHNOLOGY LT GL 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. LTM4642IY REV. DEMO CIRCUIT 2194A Thursday, January 28, 2016 2 SHEET 1 1 OF 2 A 5 4 3 2 1 D D Load Transient Circuit VOUT1 VOUT1 VOUT2 VOUT1 R27 R28 0 Ohm 2010 OPT 2010 VOUT2 VOUT2 J1 C16 1uF J2 C17 1uF OPTIONAL JUMPER FOR DUAL PHASE SINGLE OUTPUT CONFIGURATION C19 1uF 0805 R25 RUN1 OPT RUN2 C 5 C Q1 RJK0305DPB DUTY CYCLE 5% MAX 4 INTVCC IOSTEP CLK R26 E17 3 2 1 VFB2 R29 10K OPT VOUT1 R35 IOSTEP 10mV / A VOUT2 J9 OPT 2512 GND R30 0.010 1W 2512 C18 OPT E18 B B CUSTOMER NOTICE 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 APPLICATION. COMPONENT SUBSTITUTION AND PRINTED APP ENG. CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. A TECHNOLOGY LT TITLE: SCHEMATIC GL HIGH DENSITY, DUAL 4A STEP-DOWN m MODULE REGULATOR SIZE THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 5 4 3 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only N/A SCALE = NONE DATE: 2 IC NO. LTM4642IY REV. 2 DEMO CIRCUIT 2194A Thursday, January 28, 2016 SHEET 2 1 OF 2 A