QUICK START GUIDE FOR DEMO CIRCUITS 469A AND 469B HIGH EFFICIENCY STEP-DOWN POWER SUPPLY LTC3830 and LTC3832 DESCRIPTION Demonstration circuits 469A and 469B are synchronous step down power supplies providing up to 12A current at programmable 2.5V, 1.8V or 1.5V. The input range is 3.1V to 8V. DC469A features the LTC3830 while DC469B features the LTC3832. Both are voltage mode synchronous buck controllers. Both demo circuit boards provide additional footprints for paralleling MOSFETs and input/output capacitors for higher current applications. Also, the backside of each demo circuit board has a footprint for SO8 versions of the devices: the LTC3830-1 (on the DC469A); and the LTC3832-1 (on the DC469B). Before stuffing this portion of circuit, the related LTC3830 or LTC3832 circuitry on the topside must be removed. See the schematics for details. Design files for this circuit board are available. Call the LTC factory. Table 1. Performance Summary PARAMETER CONDITION VALUE Minimum Input Voltage 3.1V Maximum Input Voltage 8V VOUT (2.5V) JP1 is short (JP1 is short internally on the DC469B), JP2 and JP3 are open 2.5V ±0.05V VOUT (1.8V) JP2 is short, JP3 is open (on the DC469A, JP1 is open also) 1.8V ±0.05V VOUT (1.5V) JP3 is short, JP2 is open (on the DC469A, JP1 is open also) 1.5V ±0.05V Maximum IOUT Air flow 100LFM, VIN = 5V 12A QUICK START PROCEDURE Demonstration circuits 469A and 469B are easy to set up to evaluate the performance of the LTC3830 and LTC3832. Refer to Figure 1 for proper measurement equipment setup and follow the procedure below: NOTE: Default jumper settings: JP1 is short (DC469B: JP1 is short internally), JP2 and JP3 are open 1. Connect the input 5V power source to VIN and GND pins using wires capable of handling 8A current. 2. Turn on the 5V input power supply. 3. Measure VOUT. It should be 2.5V ±0.05V. 4. Increase load current to 12A. VOUT should be 2.5V ±0.05V. 5. Turn off the load. 6. Turn off the 5V input power. Short JP2 (DC469A: open JP1 also). 7. Turn on +5V input power. VOUT should be 1.8V ±0.05V 8. Turn off the 5V input power. Open JP2 and Short JP3. 9. Turn on 5V input power. VOUT should be 1.5V ±0.05V 1 QUICK START GUIDE FOR DEMO CIRCUITS 469A AND 469B HIGH EFFICIENCY STEP-DOWN POWER SUPPLY – + + + – – – LOAD + – + – + Figure 1. Proper Measurement Equipment Setup 2 5 4 3 2 1 REVI SION HISTORY LTC CONFIDENTIAL - For Customer Use Only ECO REV 0 DESCRIPTION A DATE PRODUCTION RELEASE 12-19-01 APPROVED > VIN D D VIN TP1 PVcc2 R17 TP6 PVcc2 1 [1] D3 PVcc1 MBR0520LT1 C10 10uF 16V D5 C11 10uF 16V C12 10uF 16V 3V-8V C14 + 220uF 10V 7343 TANT 2 0 D4 C13 10uF 16V [1] 5 6 7 8 5 6 7 8 Q1 Q2 OPTION D2 MMSZ5242B C6 1uF 16V 14 C3 C1 2.2uF 10V 9 VCC C8 0.1uF 16V C9 [1] 1 2 3 1 2 3 2 PVcc1 U1 C SS IFB G2 FREQSET 130K RUN G1 IMAX 0.01uF R3 11 TP3 C7 0.1uF 16V [1] 4 Vcc 15 R1 10 4 R4 12K PVcc2 R15 1K Si7892DP 8 PGND GND SHDN C 1 G1 L1 12 R5 VOUT 13 16 SHEET 2 Vo TP2 1K 5 6 7 8 Q3 5 6 7 8 1.3uH Q4 OPTION 3 4 Si7892DP 4 4 D1 B320A C15 + [1] OPT. 7343H [1] C16 + 180uF 4V 7343H C17 C18 + [1] + [1] OPT. OPT. 7343H 7343H 2.5V/15A C19 10uF 16V COMP R2 18.2K LTC3830EGN SENSE+ FB 7 6 1 2 3 1 2 3 R6 12.4K 1% 5 10 68pF SENSE- C4 C5 1500pF C21 470pF JP1 JP2 2.5V B R8 5.36K 1% R9 2.32K 1% JP3 1.8V 1.5V B [2] C20 [1] R7 12.7K 1% TP4 TP7 G2 UNLESS OTHERWISE SPECIFIED DIMENSIONS ARE IN INCHES TOLERANCE ON ANGLE - - 2 PLACES - - - 3 PLACES - - INTERPRET DIM AND TOL PER ASME Y14.5M -1994 NOTES: UNLESS OTHERWISE SPECIFIED, [1] DO NOT STUFF (OPTIONAL). A [2] FOR LTC3830-1ES8 - REPLACE CIRCUITRY IN DOTTED FRAME THIRD ANGLE PROJECTION (DO NOT STUFF) WITH CIRCUITRY ON SHEET 2. CONTRACT NO. APPROVALS DRAWN MEI DATE 12-19-01 CHECKED TECHNOLOGY TITLE A APPROVED STEP-DOWN POWER SUPPLY SIZE CAGE CODE DESIGNER B DO NOT SCALE DRAWING 4 3 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 SCH,LTC3830EGN HIGH EFFICIENCY ENGINEER 5 SHEET 2 Tuesday, January 07, 2003 SCALE:NONE 2 DWG NO REV A DC469A FILENAME: 469A-2.DSN SHEET 1 1 OF 2 5 4 3 2 1 REVISION HISTORY LTC CONFIDENTIAL - For Customer Use Only ECO REV <ECO#> A DESCRIPTION DATE PROTO APPROVED > 12-19-01 D D Vcc PVcc2 PVcc1 C24 [2] 0.1uF R16 1K U2[2] [2] 2 [2] PVcc1 G1 Vcc/PVcc2 G2 SS FB 1 G1 C25 7 2.2uF 10V C28 4 C 0.1uF 6 COMP GND 3 [2] R12 16.5K 1% 68pF 1500pF [2] SHEET 1 Vo 5 C27 G2 [2] C [2]C26 8 SHEET 1 R14 LTC3830-1ES8 C22 [1] 15K [2] [2] R13 16.9K 1% C23 [1] B B UNLESS OTHERWISE SPECIFIED DIMENSIONS ARE IN INCHES TOLERANCE ON ANGLE - - 2 PLACES - - 3 PLACES - - INTERPRET DIM AND TOL PER ASME Y14.5M -1994 THIRD ANGLE PROJECTION A CONTRACT NO. APPROVALS DATE DRAWN MEI 12-19-01 TECHNOLOGY TITLE CHECKED APPROVED 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 SCH,LTC3830ES8 HIGH EFFICIENCY STEP-DOWN POWER SUPPLY A ENGINEER SIZE DESIGNER CAGE CODE DWG NO DO NOT SCALE DRAWING 5 4 Tuesday, January 07, 2003 3 SCALE:NONE REV A DC469A A FILENAME: 469A-2.DSN 2 SHEET 2 OF 1 2 5 4 3 2 1 REVI SION HISTORY LTC CONFIDENTIAL - For Customer Use Only ECO REV 0 DESCRIPTION B DATE PRODUCTION RELEASE 12-19-01 APPROVED > VIN D D VIN TP1 PVcc2 R17 TP6 PVcc2 1 [1] D3 PVcc1 MBR0520LT1 C10 10uF 16V D5 C11 10uF 16V C12 10uF 16V 3.1V-8V C14 + 220uF 10V 7343 TANT 2 0 D4 C13 10uF 16V TP4 GND [1] 5 6 7 8 5 6 7 8 Q1 Q2 OPTION D2 MMSZ5242B C6 1uF 16V 14 C3 C1 2.2uF 10V 9 VCC C8 0.1uF 16V C9 [1] 1 2 3 1 2 3 2 PVcc1 U1 C SS IFB G2 FREQSET 130K RUN G1 IMAX 0.01uF R3 11 TP3 C7 0.1uF 16V [1] 4 Vcc 15 R1 10 4 R4 12K PVcc2 R15 1K Si7892DP 8 PGND GND SHDN C 1 G1 L1 12 R5 VOUT 13 16 SHEET 2 Vo TP2 1K 5 6 7 8 Q3 5 6 7 8 1.3uH Q4 OPTION 3 4 Si7892DP 4 4 D1 B320A C15 + [1] OPT. 7343H [1] C16 + 180uF 4V 7343H C17 C18 + [1] + [1] OPT. OPT. 7343H 7343H 2.5V/1.8V/1.5V C19 10uF 16V @12A COMP R2 18.2K SEE NOTE: [2] LTC3832EGN SENSE+ FB 7 6 1 2 3 1 2 3 R6 9.53K 1% 5 10 150pF SENSE- C4 C5 3300pF C21 470pF JP1 R8 16.5K 1% JP2 R9 8.66K 1% JP3 1.8V B C20 [1] 1.5V R7 3.01K 1% B TP7 GND G2 UNLESS OTHERWISE SPECIFIED DIMENSIONS ARE IN INCHES TOLERANCE ON ANGLE - - 2 PLACES - - - 3 PLACES - - INTERPRET DIM AND TOL PER ASME Y14.5M -1994 NOTES: UNLESS OTHERWISE SPECIFIED, [1] C9,C15,C17,C18,C20,D4,D5,Q2,Q4 OPTIONAL - DO NOT STUFF. A [2] DC469B-A: COMPONENTS INSIDE DOTTED FRAME SHEET 1. DC469B-B: COMPONENTS ON SHEET 2 INSTEAD. THIRD ANGLE PROJECTION CONTRACT NO. APPROVALS DRAWN MEI DATE 12-19-01 CHECKED TECHNOLOGY TITLE A STEP-DOWN POWER SUPPLY ENGINEER SIZE CAGE CODE DESIGNER B DO NOT SCALE DRAWING 4 3 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 SCH,LTC3832EGN/-1ES8 HIGH EFFICIENCY APPROVED 5 SHEET 2 Monday, January 06, 2003 SCALE:NONE 2 DWG NO REV B DC469B FILENAME: 469B-1.DSN SHEET 1 1 OF 2 5 4 3 2 1 REVISION HISTORY LTC CONFIDENTIAL - For Customer Use Only ECO REV <ECO#> B DESCRIPTION DATE PROTO APPROVED > 12-19-01 D D Vcc PVcc2 PVcc1 C24 [2] 0.1uF R16 1K U2[2] [2] 2 PVcc1 G1 Vcc/PVcc2 G2 SS FB 1 G1 C25 SHEET 1 [2] 7 2.2uF 10V C28 G2 SHEET 1 Vo [2] 5 C [2]C26 8 4 C 0.1uF 6 COMP GND 3 [2] R12 9.53K 1% 150pF C27 R14 3300pF 15K [2] [2] LTC3832-1ES8 C22 [1] [2] R13 3.01K 1% C23 [1] B B UNLESS OTHERWISE SPECIFIED DIMENSIONS ARE IN INCHES TOLERANCE ON ANGLE - - 2 PLACES - - 3 PLACES - - INTERPRET DIM AND TOL PER ASME Y14.5M -1994 THIRD ANGLE PROJECTION A CONTRACT NO. APPROVALS DATE DRAWN MEI 12-19-01 TECHNOLOGY TITLE CHECKED APPROVED 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 SCH,LTC3832EGN/-1ES8 HIGH EFFICIENCY STEP-DOWN POWER SUPPLY A ENGINEER SIZE DESIGNER CAGE CODE DWG NO DO NOT SCALE DRAWING 5 4 Monday, January 06, 2003 3 SCALE:NONE REV B DC469B A FILENAME: 469B-1.DSN 2 SHEET 2 OF 1 2