DEMO MANUAL DC2004A LTC3622EMSE 17V, Dual 1A Synchronous Step-Down Regulator with Ultralow Quiescent Current DESCRIPTION Demonstration circuit 2004A is a synchronous stepdown regulator using the power-saving LTC®3622EMSE monolithic buck regulator in a 16-lead MSE package. The DC2004A operates from an input voltage range of 2.7V to 17V and provides dual 1A outputs with adjustable output voltage range from 1.2V to 5V. The LTC3622 IC quiescent current can be as low as 5µA in Burst Mode® operation with both channels enabled and less than 0.1µA in shutdown mode. The switching frequency is fixed to 1MHz or 2.25MHz with a ±50% synchronization range to an external clock. A user-selectable mode input is provided to allow the user to trade off ripple noise for light load efficiency. PERFORMANCE SUMMARY PARAMETER Burst Mode operation provides the highest efficiency at light loads, while pulse-skipping mode provides the lowest ripple noise. It is recommended to read the data sheet LTC3622 with this demo manual prior to working on or making any changes to DC2004A. Design files for this circuit board are available at http://www.linear.com/demo L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Specifications are at TA = 25°C CONDITIONS VALUE Default IC LTC3622EMSE Default Switching Frequency 1MHz Default Operation Mode Burst Mode Operation Input Voltage Range Onboard User Selectable Output Voltages 2.7V to 17V VIN = 2.7V to 17V, IOUT1 = IOUT2 = 0A to 1A (VOUT ≤ VIN) VOUT1: 1.2V, 1.8V, 2.5V VOUT2: 3.3V, 5.0V Default Output Voltage VOUT1 = 2.5V VOUT2 = 3.3V Per Channel Maximum Continuous Output Current VIN = 2.7V to 17V IOUT1 = IOUT2 = 1A Efficiency, VOUT1 VIN = 12V, VOUT1 = 2.5V, IOUT1 = 1A 85.7% (See Figure 3) Efficiency, VOUT2 VIN = 12V, VOUT2 = 3.3V, IOUT2 = 1A 87.9% (See Figure 4) Output Voltage Ripple, VOUT1 VIN = 12V, VOUT1 = 2.5V, IOUT1 = 1A <4.7mVP-P (See Figure 5) Output Voltage Ripple, VOUT2 VIN = 12V, VOUT2 = 3.3V, IOUT2 = 1A <5.3mVP-P (See Figure 6) Load Transient Response, VOUT1 VIN = 12V, VOUT1 = 2.5V, IOUT1 = 100mA to 1A See Figure 7 Load Transient Response, VOUT2 VIN = 12V, VOUT2 = 3.3V, IOUT2 = 100mA to 1A See Figure 8 Thermal Image VIN = 12V, VOUT1 = 2.5V, VOUT2 = 3.3V, IOUT1 = IOUT2 = 1A, TA = 25°C See Figure 9 dc2004af 1 DEMO MANUAL DC2004A QUICK START PROCEDURE Demonstration circuit 2004A is easy to set up to evaluate the performance of the LTC3622. Please refer to Figure 1 for proper measurement equipment setup and follow the procedure below: 1.Place jumpers in the following positions: Table 1. Jumper Selection JP1 JP2 JP3 JP4 JP5 RUN1 RUN2 MODE/SYNC PHASE ILIM ON ON BURST 180° 1A 2.Place VO1 SELECT jumper in 2.5V position (JP8) and VO2 SELECT jumper in 3.3V position (JP10). 3.With power off, connect the input power supply at VIN1 and GND. 4.Connect the Loads between VOUT1 and GND, VOUT2 and GND. Preset the loads to 0A. 5.Connect the DMMs to the input and output to monitor the input voltage and output voltages. 6.Turn on the power supply at the input. The RUN1 and RUN2 pin jumpers should be at ON position. Measure and make sure the input supply voltage is 12V. The output voltage VOUT1 should be 2.5V ±1%, and VOUT2 should be 3.3V ±1%. 7.Once the input and output voltages are properly established adjust the loads within the operating range (0A to 1A max) and observe the output voltage regulations, output ripple voltages, switch node waveforms and other parameters. Refer to Figure 2 for proper input/output voltage ripple measurement. 8.To select other output voltages, use the onboard user selectable output voltage jumpers. Shutting down LTC3622 by placing RUN1 and RUN2 pin jumpers to the OFF position or turn off the input power supply. Refer to the following tables (Table 2 and Table 3) for the output voltage selections and repeat steps 3 to 6. Table 2. VOUT1 Jumper Selection JP6 JP7 JP8 JP9 1.2V 1.8V 2.5V *USER SELECT Table 3. VOUT2 Jumper Selection JP10 JP11 JP12 3.3V 5V *USER SELECT *Note: If JP9 or JP12 is selected, R5 or R15 needs to be calculated and inserted to obtain the desired output voltage. Note 1: To measure the input/output voltage ripple properly, do not use the long ground lead on the oscilloscope probe. See Figure 2 for the proper scope probe technique. Short, stiff leads need to be soldered to the (+) and (–) terminals of an output capacitor. The probe’s ground ring needs to touch the (–) lead and the probe tip needs to touch the (+) lead. Note 2: DC2004A can also be used to evaluate LTC3622EMSE-2 (2.25MHz) by simply changing U1 to LTC3622EMSE-2, L1 to 1.0µH (Coilcraft XFL4020-102ME) and L2 to 2.2µH (Coilcraft XFL4020-222ME). dc2004af 2 DEMO MANUAL DC2004A QUICK START PROCEDURE Figure 1. Proper Equipment Measurement Setup + VOUT COUT – GND Figure 2. Scope Probe Placements for Measuring Input or Output Ripple dc2004af 3 DEMO MANUAL DC2004A QUICK START PROCEDURE 100 100 Burst Mode OPERATION 90 80 EFFICIENCY (%) EFFICIENCY (%) 80 70 PULSE-SKIPPING MODE 60 50 70 60 50 40 40 30 30 20 0.0001 Burst Mode OPERATION 90 0.01 0.001 0.1 LOAD CURRENT (A) 20 0.0001 1 Figure 3. VOUT1 Measured Efficiency at VIN = 12V, VOUT1 = 2.5V, L1 = 3.3µH, fSW = 1MHz (with VOUT2 OFF) VOUT1 10mV/DIV PULSE-SKIPPING MODE 0.01 0.001 0.1 LOAD CURRENT (A) 1 Figure 4. VOUT2 Measured Efficiency at VIN = 12V, VOUT2 = 3.3V, L1 = 4.7µH, fSW = 1MHz (with VOUT1 OFF) VOUT2 10mV/DIV 20MHz BW LIMIT 2µs/DIV Figure 5. VOUT1 Measured Output Voltage Ripple at VIN = 12V, VOUT1 = 2.5V, IOUT1 = 1A, fSW = 1MHz 20MHz BW LIMIT 2µs/DIV Figure 6. VOUT2 Measured Output Voltage Ripple at VIN = 12V, VOUT2 = 3.3V, IOUT2 = 1A, fSW = 1MHz dc2004af 4 DEMO MANUAL DC2004A QUICK START PROCEDURE VOUT1 200mV/DIV IOUT1 0.5A/DIV IOUT1: 100mA TO 1A 100µs/DIV Figure 7. Load Transient Response at VIN = 12V, VOUT1 = 2.5V, IOUT1 = 100mA to 1A, fSW = 1MHz, Burst Mode Operation VOUT2 200mV/DIV IOUT2 0.5A/DIV IOUT2: 100mA TO 1A 100µs/DIV Figure 8. Load Transient Response at VIN = 12V, VOUT2 = 3.3V, IOUT2 = 100mA to 1A, fSW = 1MHz, Burst Mode Operation Figure 9. Thermal Performance at VIN = 12V, VOUT1 = 2.5V, IOUT1 = 1A, VOUT2 = 3.3V, IOUT2 = 1A, fSW = 1MHz, No Airflow, TA = 25°C dc2004af 5 DEMO MANUAL DC2004A PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components 1 2 CFF1, CFF2 CAP, 0402 22pF 5% 50V NPO AVX 04025A220JAT2A 2 2 CIN1, CIN2 CAP, 7343 22µF 20% 35V TANT AVX TPSY226M035R0200 3 2 C1, C2 CAP, 1206 47µF 20% 16V X5R TDK C3216X5R1C476M160AB 4 2 C5, C6 CAP, 1206 10µF 20% 25V X5R TDK C3216X5R1E106M 5 1 C7 CAP, 1206 1.0µF 20% 10V X5R TDK C3216X5R1A105M 6 1 C8 CAP, 0402 1.0µF 20% 10V X5R TDK C1005X5R1A105M 7 1 L1 IND, 3.3µH 20% COILCRAFT XFL4020-332MEC 8 1 L2 IND, 4.7µH 20% COILCRAFT XFL4020-472MEC 9 2 RPG1, RPG2 RES, 0402 100k 1% 1/16W VISHAY CRCW0402100KFKED 10 3 RSET1, R1, RSET2 RES, 0402 619k 1% 1/16W VISHAY CRCW0402619KFKED 11 1 R2 RES, 0402 309k 1% 1/16W VISHAY CRCW0402309KFKED 12 1 R3 RES, 0402 196k 1% 1/16W VISHAY CRCW0402196KFKED 13 1 R13 RES, 0402 137k 1% 1/16W VISHAY CRCW0402137KFKED 14 1 R6 RES, 0805 0Ω JUMPER VISHAY CRCW08050000Z0EA 15 1 R7 RES, 0603 0Ω JUMPER VISHAY CRCW06030000Z0EA 16 2 R8, R9 RES, 0402 0Ω 1% VISHAY, CRCW04020000Z0ED 17 1 R14 RES, 0402 84.5k 1% 1/16W VISHAY CRCW040284K5FKED 18 1 U1 IC, DUAL SYNCHRONOUS STEP-DOWN CONVERTER LINEAR TECH LTC3622EMSE Additional Demo Board Circuit Components 1 0 C3, C4 CAP, 0402 OPTION OPTION 2 0 R5, R15 RES, 0402 OPTION OPTION 1 13 E1, E2, E3, E4, E5, E6, E7, E8, TURRET MILL-MAX 2501-2-00-80-00-00-07-0 2 2 JP1, JP2 HEADER, 3PIN, 2mm SULLINS NRPN031PAEN-RC 3 2 JP3, JP5 HEADER, 3PIN, DBL ROW 2mm SULLINS NRPN032PAEN-RC 4 1 JP4 HEADER, 2mm DBL ROW (2X2) 4PIN SULLINS, NRPN022PAEN-RC 5 7 JP6, JP7, JP8, JP9, JP10, JP11, JP12 HEADER, 2PIN, 2mm SULLINS NRPN021PAEN-RC 6 7 XJP1, XJP2, XJP3, XJP4, XJP5, SHUNT, 2mm XJP6, XJP10 SAMTEC 2SN-BK-G 7 4 MH1, MH2, MH3, MH4 KEYSTONE_8831 Hardware E9, E10, E11, E12, E13 STANDOFF, SNAP ON dc2004af 6 Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights. A B C D E1 E12 INTVCC SYNC 3.6V E3 E2 2.7V - 17V VIN2 GND E13 2.7V - 17V VIN1 GND E8 2.7V - 17V SVIN E11 5 INTVCC CIN2 15uF 35V 7343 CIN1 15uF 35V 7343 5 1A 5 3 500mA CHAN 2 ONLY ILIM JP5 6 4 2 JP4 4 PHASE 3 1 0 6 JP3 2 5 PULSE-SKIP 4 2 1 3 BURST 180 1 SYNC MODE/SYNC 3 OFF 1 3 2 JP2 RUN2 JP1 2 1 ON OFF 500mA C6 10uF 25V 1206 R6 0 0805 ON RUN1 C8 1uF 0 4 1. ALL RESISTORS ARE IN OHMS, 0402. ALL CAPACITORS ARE IN MICROFARADS, 0402. NOTE: UNLESS OTHERWISE SPECIFIED + + C5 10uF 25V 1206 R7 4 12 7 5 4 10 8 14 1 2 INTVCC ILIM PHASE 17 GND FB2 SW2 PGOOD2 NC FB1 SW1 PGOOD1 JP7 1.8V R2 309k 1% 0 4.7uH CUSTOMER NOTICE R9 RPG2 100k 1% INTVCC JP6 1.2V R1 619k 1% R8 0 L2 VOUT1 3.3uH L1 RPG1 100k 1% INTVCC JP10 3.3V R13 137k 1% RSET2 619k 1% JP8 2.5V R3 196k 1% 3 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 2 REV SCALE = NONE 2 C2 47uF 1206 C1 47uF 1206 DATE: N/A SIZE E10 E7 E6 E9 1 DATE 2-4-14 IC NO. 1 SHEET 1 LTC3622EMSE DEMO CIRCUIT 2004A Thursday, February 13, 2014 PCB NO. HAORAN W. APPROVED 2 OF 1 REV. 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only GND 1A VOUT2 PGOOD2 GND VOUT1 1A PGOOD1 TECHNOLOGY C4 OPT C3 OPT E5 E4 PROD. DESCRIPTION REVISION HISTORY DUAL WIDE VIN SYNCHRONOUS BUCK REGULATOR WITH ULTRA-LOW QUIESCENT CURRENT TITLE: SCHEMATIC JP12 USER SELECT APPROVALS JP11 5V R15 OPT CFF2 22pF JP9 USER SELECT R5 OPT CFF1 22pF R14 84.5K 1% RSET1 619k 1% 2 ECO 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. HZ VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APP ENG. HAORAN W. APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. 11 9 6 15 13 16 3 LTC3622EMSE MODE/SYNC RUN2 VIN2 RUN1 VIN1 SVIN U1 C7 1uF 25V 1206 3 A B C D DEMO MANUAL DC2004A SCHEMATIC DIAGRAM dc2004af 7 DEMO MANUAL DC2004A DEMONSTRATION BOARD IMPORTANT NOTICE Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions: This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations. If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES. The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LTC from all claims arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or agency certified (FCC, UL, CE, etc.). No License is granted under any patent right or other intellectual property whatsoever. LTC assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind. LTC currently services a variety of customers for products around the world, and therefore this transaction is not exclusive. Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and observe good laboratory practice standards. Common sense is encouraged. This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LTC application engineer. Mailing Address: Linear Technology 1630 McCarthy Blvd. Milpitas, CA 95035 Copyright © 2004, Linear Technology Corporation dc2004af 8 Linear Technology Corporation LT 0714 • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com LINEAR TECHNOLOGY CORPORATION 2014